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Symmetrical level schemes of the even-even Sm-A approximate to(130) and Yb-A(approximate to)160 nuclei up to 10(+) in the yrast bands
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier Science Bv
Yazar(lar) :
Saygi , Bahadir
Konu :
Pseudo-mirror nuclei, Reduced transition probabilities, Level schemes
Yıl :
2018
Nuclear Physics A
Yayıncı Web Sitesi
Kaydet
For the first time, we show here that three isotopes of the Sm isotopic chain almost overlay with three isotopes of the Yb isotopic chain in terms of experimental observables within the N pi N nu scheme. A recent systematic work by Saygi on reduced transitional probabilities in pseudo-mirror nuclei revealed that nuclei having particle-hole symmetry tend to manifest alike experimental structures. The N pi N nu quantity is an indicator of the symmetry and depends on valence nucleon (or holes) number from the nearest closed shell by considering the subshell closures, which simplifies the systematics of excitation energies and related B(E2; L+ -> (L - 2)(+)) values of excited states in nuclei placed in the different mass regions of nu- clear chart. In the light of available data, the experimental observables in the group of Sm-136-Yb-160, Sm-134-Yb-162 and Sm-132-Yb-164 nuclei have been analyzed in a vertical and horizontal perspectives and the ratio of reduced transition probabilities of the first excited states compared with existing theoretical predictions. The data brought to light that the structure of each group reflects identical yrast bands up to 10(+). (C) 2018 Elsevier B.V. All rights reserved.
Anahtar Kelimeler : Pseudo-mirror nuclei, Reduced transition probabilities, Level schemes, article
Cilt: 980
ISSN: 0375-9474
Sınıflandırma :
2
Structure of the N=50 As, Ge, Ga nuclei
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak 1:
DSpace Makaleler
Kaynak 2:
DSpace Makaleler
Dergi:
NUCLEAR PHYSICS A
Yayıncı:
ELSEVIER SCIENCE BV
Yazar(lar) :
E. Sahin , G. de Angelis , G. Duchene , T. Faul , A. Gadea , A. F. Lisetskiy , D. Ackermann , A. Algora , S. Aydin , F. Azaiez , D. Bazzacco , G. Benzoni , M. Bostan , T. Byrski , I. Celikovic , R. Chapman , L. Corradi , S. Courtin , D. Curien , U. Datta Pramanik , F. Didierjean , O. Dorvaux , Mustafa Nizamettin Erduran , S. Erturk , E. Farnea , E. Fioretto , G. de France , S. Franchoo , B. Gall , A. Gottardo , B. Guiot , F. Haas , F. Ibrahim , E. Ince , A. Khouaja , A. Kusoglu , G. La Rana , M. Labiche , D. Lebhertz , S. Lenzi , S. Leoni , S. Lunardi , P. Mason , D. Mengoni , C. Michelagnoli , V. Modamio , G. Montagnoli , D. Montanari , R. Moro , B. Mouginot , D. R. Napoli , D. O'Donnell , J. R. B. Oliveira , J. Ollier , R. Orlandi , G. Pollarolo , F. Recchia , J. Robin , M. -D. Salsac , F. Scarlassara , R. P. Singh , R. Silvestri , J. F. Smith , I. Stefan , A. M. Stefanini , K. Subotic , S. Szilner , D. Tonev , D. A. Torres , M. Trotta , P. Ujic , C. Ur , J. J. Valiente-Dobon , D. Verney , M. Yalcinkaya , P. T. Wady , K. T. Wiedemann , K. Zuber
Konu :
NUCLEAR REACTIONS U-238(Se-82, Ga-81), (Se-82, Ge-82), (Se-82, As-83), E=515 MeV, measured E gamma, I gamma (theta), gamma gamma-coin, reaction fragments, (fragment)gamma-coin, PRISMA magnetic spectrometer, gamma after deexcitation, Ge Compton-suppressed detectors of CLARA array, thin, thick target, deduced sigma(theta), levels, J, pi calculated levels, J, pi using shell model
Yıl :
2012
NUCLEAR PHYSICS A
Tam Metin
Kaydet
The level structures of the N = 50 As-83, Ge-82, and Ga-81 isotones have been investigated by means of multi-nucleon transfer reactions. A first experiment was performed with the CLARA PRISMA setup to identify these nuclei. A second experiment was carried out with the GASP array in order to deduce the gamma-ray coincidence information. The results obtained on the high-spin states of such nuclei are used to test the stability of the N = 50 shell closure in the region of Ni-78 (Z = 28). The comparison of the experimental level schemes with the shell-model calculations yields an N = 50 energy gap value of 4.7(3) MeV at Z = 28. This value, in a good agreement with the prediction of the finite-range liquid-drop model as well as with the recent large-scale shell model calculations, does not support a weakening of the N = 50 shell gap down to Z = 28. (c) 2012 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.nuclphysa.2012.08.007
Anahtar Kelimeler : NUCLEAR REACTIONS U-238(Se-82, Ga-81), (Se-82, Ge-82), (Se-82, As-83), E=515 MeV, measured E gamma, I gamma (theta), gamma gamma-coin, reaction fragments, (fragment)gamma-coin, PRISMA magnetic spectrometer, gamma after deexcitation, Ge Compton-suppressed detectors of CLARA array, thin and thick target, deduced sigma(theta), levels, J, pi calculated levels, J, pi using shell model, article
Cilt: 893
ISSN: 0375-9474
Sınıflandırma :
3
Evidence for light-by-light scattering in ultraperipheral PbPb collisions at √sNN = 5.02 TeV
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier
Yazar(lar) :
D. d'Enterria , A. M. Sirunyan , Bora Işıldak
Konu :
Light-by-light scattering, Heavy ions, Ultraperipheral collisions, CMS, LHC
Yıl :
2019
Nuclear Physics A
Yayıncı Web Sitesi
Tam Metin
Kaydet
Evidence for light-by-light (LbL) scattering, gamma gamma -> gamma gamma, in ultraperipheral PbPb collisions at a nucleon-nucleon center of-mass energy of 5.02 TeV is reported. LbL scattering processes are selected in events with just two photons produced, with transverse energy E-T(gamma) > 2 GeV, pseudorapidity vertical bar eta(gamma)vertical bar < 2.4; and diphoton invariant mass m(gamma gamma) > 5 GeV, transverse momentum p(T)(gamma gamma) < 1 GeV, and acoplanarity (1 - Delta phi(gamma gamma)/pi) < 0.01. After all selection criteria, 14 events are observed, compared to 11.1 +/- 1.1 (theo) and 3.8 +/- 1.3 (stat) events expected for signal and background processes respectively. The significance of the signal excess over the background-only hypothesis is 4.10 sigma. The measured fiducial LbL scattering cross section, sigma(fid)(gamma gamma -> gamma gamma) = 122 +/- 46 (stat) +/- 29 (syst) +/- 4 (theo) nb is consistent with the standard model prediction.
Anahtar Kelimeler : Article

ISSN: 0375-9474
4
Beyond nPDFs effects: prompt J/ψ and ψ(2S) production in pPb and pp collisions
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier
Yazar(lar) :
G. Oh , A. M. Sirunyan , Bora Işıldak
Konu :
Quarkonia, Charmonia, Prompt Jψ, Prompt ψ(2S), Production
Yıl :
2019
Nuclear Physics A
Yayıncı Web Sitesi
Tam Metin
Kaydet
A multi-dimensional analysis of prompt charmonia in pp and pPb collisions at root s(NN) = 5.02 TeV with the CMS detector is presented. The pPb differential cross-sections of prompt J/psi are shown in a wide kinematic region, for transverse momentum p(T) spanning from 2 to 30 GeV/c and a rapidity interval between -2.4 to 1.93 in the center of mass of the collision. The final results on prompt psi/(2S) meson production cross section in pp and pPb collisions at 5.02 TeV are also reported as a function of p(T) and rapidity, for p(T) from 4 to 30 GeV/c. The nuclear modification factor is found to be smaller than that of prompt J/psi in all measured bins, especially at low p(T) and at backward rapidity. Such a different behaviour between the ground and excited states cannot be reproduced considering nPDF effects alone.
Anahtar Kelimeler : Article

ISSN: 0375-9474
Sınıflandırma :
5
Multiparticle correlations and higher order harmonics in pPb collisions at √sNN = 8.16 TeV
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier
Yazar(lar) :
Q. Wang , A. M. Sirunyan , Bora Işıldak
Konu :
CMS, Heavy ion, Cumulant, Flow, Collectivity, Small system, Quark-gluon plasma
Yıl :
2019
Nuclear Physics A
Yayıncı Web Sitesi
Tam Metin
Kaydet
The elliptic and higher-order azimuthal anisotropy Fourier harmonics (v(n)) are obtained for pPb collisions at root s(NN) = 8.16 TeV over a wide range of event multiplicities based on multiparticle correlations. The data were collected by the CMS experiment during the 2016 LHC run. A sample of peripheral PbPb collisions at root s(NN) = 5.02 TeV covering a similar range of event multiplicities to the pPb results is also analyzed for comparison. The ratios of different harmonic moments are obtained for both v(2) and v(3) with high precision, which allows a direct comparison to theoretical predictions assuming a hydrodynamic evolution of the created medium with initial-state density fluctuations, particularly probing the non-Gaussian nature of initial-state fluctuations in small collision systems. The presented results provide crucial insights into the origin of collective long-range correlations observed in small collision systems.
Anahtar Kelimeler : Article

ISSN: 0375-9474
Sınıflandırma :
6
CMS Collaboration
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Dergi Makalesi
Kaynak 1:
DSpace Makaleler
Kaynak 2:
DSpace Makaleler
Kaynak 3:
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier
Yazar(lar) :
T. K. Aarrestad , Bora Işıldak
Yıl :
2016
Nuclear Physics A
Kaydet
Anahtar Kelimeler : Article

ISSN: 0375-9474
Sınıflandırma :
7
Nuclear structure properties and stellar weak rates for Se-76: Unblocking of the Gamow Teller strength
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier Science Bv
Yazar(lar) :
Jameel-Un Nabi , Mavra Ishfaq , Mahmut Boyukata , Muhammad Riaz
Konu :
Gamow-Teller transitions, pn-QRPA model, IBM model, Nuclear structure, Electron capture, beta-Delayed neutron emissions
Yıl :
2017
Nuclear Physics A
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet
At finite temperatures (>= 10(7)K), Se-76 is abundant in the core of massive stars and electron capture on Se-76 has a consequential role to play in the dynamics of core-collapse. The present work may be classified into two main categories. In the first phase we study the nuclear structure properties of Se-76 using the interacting boson model-1 (IBM-1). The IBM-1 investigations include the energy levels, B (E2) values and the prediction of the geometry. We performed the extended consistent-Q formalism (ECQF) calculation and later the triaxial formalism calculation (constructed by adding the cubic term to the ECQF). The geometry of Se-76 can be envisioned within the formalism of the potential energy surface based on the classical limit of IBM-1 model. In the second phase, we reconfirm the unblocking of the Gamow Teller (GT) strength in Se-76 (a test case for nuclei having N > 40 and Z < 40). Using the deformed pn-QRPA model we calculate GT transitions, stellar electron capture cross section (within the limit of low momentum transfer) and stellar weak rates for Se-76. The distinguishing feature of our calculation is a state-by-state evaluation of stellar weak rates in a fully microscopic fashion. Results are compared with experimental data and previous calculations. The calculated GT distribution fulfills the Ikeda sum rule. Rates for, beta-delayed neutrons and emission probabilities are also calculated. Our study suggests that at high stellar temperatures and low densities, the beta(+)-decay on Se-76 should not be neglected and needs to be taken into consideration along with electron capture rates for simulation of presupernova evolution of massive stars. (C) 2017 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.nuclphysa.2017.05.091
Anahtar Kelimeler : Gamow-Teller transitions, pn-QRPA model, IBM model, Nuclear structure, Electron capture, beta-Delayed neutron emissions, article
Cilt: 966
ISSN: 0375-9474
8
beta-Decay half-lives and nuclear structure of exotic proton-rich waiting point nuclei under rp-process conditions
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier
Yazar(lar) :
Jameel-Un Nabi , Mahmut Boyukata
Konu :
Waiting point nuclei, rp-process, Gamow-Teller strength distribution, Electron capture, IBM, pn-QRPA
Yıl :
2016
Nuclear Physics A
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet
We investigate even even nuclei in the A similar to 70 mass region within the framework of the proton neutron quasi-particle random phase approximation (pn-QRPA) and the interacting boson model-1 (IBM-1). Our work includes calculation of the energy spectra and the potential energy surfaces V (beta, gamma) of Zn, Ge, Se, Kr and Sr nuclei with the same proton and neutron number, N = Z. The parametrization of the IBM-1 Hamiltonian was performed for the calculation of the energy levels in the ground state bands. Geometric shape of the nuclei was predicted by plotting the potential energy surfaces v(beta, gamma) obtained from the IBM-1 Hamiltonian in the classical limit. The pn-QRPA model was later used to compute half-lives of the neutron-deficient nuclei which were found to be in very good agreement with the measured ones. The pn-QRPA model was also used to calculate the Gamow-Teller strength distributions and was found to be in decent agreement with the measured data. We further calculate the electron capture and positron decay rates for these N = Z waiting point (WP) nuclei in the stellar environment employing the pn-QRPA model. For the rp-process conditions, our total weak rates are within a factor two compared with the Skyrme HF + BCS + QRPA calculation. All calculated electron capture rates are comparable to the competing positron decay rates under rp-process conditions. Our study confirms the finding that electron capture rates form an integral part of the weak rates under rp-process conditions and should not be neglected in the nuclear network calculations. (C) 2016 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.nuclphysa.2016.01.003
Anahtar Kelimeler : Waiting point nuclei, rp-process, Gamow-Teller strength distribution, Electron capture, IBM, pn-QRPA, article
Cilt: 947
ISSN: 0375-9474
Sınıflandırma :
9
Scalar and vector self-energies of heavy baryons in nuclear medium
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier Science Bv
Yazar(lar) :
K. Azizi , N. Er , H. Sundu
Konu :
Nuclear matter, Heavy hadrons, Mass, Residue, Scalar, vector self-energies
Yıl :
2017
Nuclear Physics A
Yayıncı Web Sitesi
Kaydet
The in-medium sum rules are employed to calculate the shifts in the mass and residue as well as the scalar and vector self-energies of the heavy Lambda(Q), Sigma(Q) and Xi(Q) baryons, with Q being b or c quark. The maximum shift in mass due to nuclear matter belongs to the Sigma(c) baryon and it is found to be Delta m Sigma(c) = -936 MeV. In the case of residue, it is obtained that the residue of Sigma(b) baryon is maximally affected by the nuclear medium with the shift Delta lambda Sigma(b) = -0.014 GeV3. The scalar and vector self-energies are found to be Sigma(S)(Lambda b)= 653 MeV, Sigma(S)(Lambda b) = -614 MeV, Sigma(S)(Xi b) = -17 MeV, Sigma(S)(Lambda c)., = 272 MeV, Sigma(S)(Sigma c) = -936 MeV, Sigma(S)(Xi c) = -5 MeV and Sigma(nu)(Lambda c) = 436 +/- 148 MeV, Sigma(nu)(Sigma c) = 382 +/- 129 MeV, Sigma(nu)(Xi c) =15 +/- 5 MeV, Sigma(nu)(Lambda c) =151 +/- 45 MeV, Sigma(nu)(Sigma c)= 486 +/- 144 MeV and Sigma(nu)(Xi c) = 1.391 +/- 0.529 MeV. (C) 2017 The Author(s). Pcublished by Elsevier B.V.
Anahtar Kelimeler : Nuclear matter, Heavy hadrons, Mass, Residue, Scalar and vector self-energies, article
Cilt: 960
ISSN: 0375-9474
Sınıflandırma :
10
Beyond nPDFs effects : Prompt J
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier
Yazar(lar) :
Geonhee Oh , A. M. Sirunyan , A. Tumasyan , W. Adam , F. Ambrogi , E. Asilar , T. Bergauer
Konu :
Quarkonia, Charmonia, Prompt Jpsi, Prompt psi(2S), Production
Yıl :
2019
Nuclear Physics A
Yayıncı Web Sitesi
Kaydet
A multi-dimensional analysis of prompt charmonia in pp and pPb collisions at root s(NN) = 5.02 TeV with the CMS detector is presented. The pPb differential cross-sections of prompt J/psi are shown in a wide kinematic region, for transverse momentum p(T) spanning from 2 to 30 GeV/c and a rapidity interval between -2.4 to 1.93 in the center of mass of the collision. The final results on prompt psi/(2S) meson production cross section in pp and pPb collisions at 5.02 TeV are also reported as a function of p(T) and rapidity, for p(T) from 4 to 30 GeV/c. The nuclear modification factor is found to be smaller than that of prompt J/psi in all measured bins, especially at low p(T) and at backward rapidity. Such a different behaviour between the ground and excited states cannot be reproduced considering nPDF effects alone.
Anahtar Kelimeler : Quarkonia, Charmonia, Prompt Jpsi, Prompt psi(2S), Production, article
Cilt: 982
ISSN: 0375-9474
Sınıflandırma :
11
Fragmentation of J
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier
Yazar(lar) :
Batoul Diab , A. M. Sirunyan , A. Tumasyan , W. Adam , F. Ambrogi , E. Asilar , T. Bergauer
Konu :
CMS, Jpsi, Jets, pp collisions
Yıl :
2019
Nuclear Physics A
Yayıncı Web Sitesi
Kaydet
The fragmentation of jets containing a J/psi meson is studied in root s = 5.02 TeV pp data using an integrated luminosity of L = 27.39 pb(-1). The fraction of the jet transverse momentum p(Tjet) carried by the J/psi is measured for prompt J/psi and J/psi coming from b hadron decays, named nonprompt. Whereas the fragmentation function of nonprompt J/psi is well-modeled by simulations using a Monte Carlo generator, the prompt J/psi are found to be accompanied by a larger level of jet activity. The fraction of J/psi mesons that are produced inside a jet is also reported, and found to be larger in data than in simulation, for both prompt and nonprompt J/psi.
Anahtar Kelimeler : CMS, Jpsi, Jets, pp collisions, article
Cilt: 982
ISSN: 0375-9474
Sınıflandırma :
12
D-0-Meson R-AA in PbPb Collisions at root s(NN)=5.02 TeV and Elliptic Flow in pPb Collisions at root s(NN)=8.16 TeV with CMS
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier
Yazar(lar) :
Zhaozhong Shi , A. M. Sirunyan , A. Tumasyan , W. Adam , F. Ambrogi , E. Asilar , T. Bergauer
Konu :
Heavy Flavor, Nuclear Modification Factor, Energy Loss Mechanism, Elliptic Flow, Small Systems
Yıl :
2019
Nuclear Physics A
Yayıncı Web Sitesi
Kaydet
The study of charm production in heavy-ion collisions is considered an excellent probe for the properties of the hot and dense medium created in heavy-ion collisions. Measurements of D-0-meson nuclear modification factor can provide strong constraints into the mechanisms of in-medium energy loss and charm flow in the medium. The measurement of D-0-meson elliptic flow in pPb collisions helps us understand the strength of charm quarks coupling to significantly reduced systems which demonstrate hydrodynamic properties. In this paper, the measurements of the D-0-meson nuclear modification factor in PbPb collisions at 5.02 TeV together with the new measurement of D-0-meson elliptic flow in high multiplicity pPb collisions at 5.02 TeV using the two-particle correlation method will be presented.
Anahtar Kelimeler : Heavy Flavor, Nuclear Modification Factor, Energy Loss Mechanism, Elliptic Flow, Small Systems, article
Cilt: 982
ISSN: 0375-9474
Sınıflandırma :
13
Insights into the low energy incomplete fusion
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier B.V.
Yazar(lar) :
Rudra N. Sahoo , Malika Kaushik , Pawan S.Ashok Kumar , Arshiya Sood , Vijay Raj Sharma , Abhishek Yadav , Pushpendera P. Singh , Sezgin Aydın
Konu :
Activation Technique, Complete Fusion, Excitation Functions, Incomplete Fusion, Low Energy Heavy-ion Reactions, Off-line ?-spectroscopy
Yıl :
2019
Nuclear Physics A
Yayıncı Web Sitesi
Tam Metin
Kaydet
In the present work, channel-by-channel excitation functions of different evaporation residues populated via complete and/or incomplete fusion in C12+169Tm system have been measured for an energy range Elab?53–90MeV, using recoil-catcher activation technique followed by off-line ?-spectroscopy. Experimentally measured excitation functions have been analysed in the framework of statistical model code PACE. To probe the effect of entrance-channel parameters on the onset and strength of incomplete fusion, relative contributions of complete and incomplete fusion have been deduced from the analysis of experimentally measured excitation functions. The percentage fraction of incomplete fusion deduced from the analysis of excitation functions has been studied in terms of incident energy, entrance-channel mass-asymmetry, ground state alpha-Q-value, neutron skin thickness of target nuclei, and nuclear potential parameters. It has been found that incomplete fusion start competing with complete fusion even at slightly above barrier energies where complete fusion is assumed to the sole contributor. The probability of incomplete fusion increases with incident energy, entrance channel mass-asymmetry, large negative ground state alpha-Q-value, neutron skin thickness, and nuclear potential parameters for individual projectiles.
Anahtar Kelimeler : Activation Technique, Complete Fusion, Excitation Functions, Incomplete Fusion, Low Energy Heavy-ion Reactions, Off-line ?-spectroscopy, article
Cilt: 983
ISSN: 3759474
Sınıflandırma :
14
D0-meson RAA in PbPb collisions at √sNN = 5.02 TeV and elliptic flow in pPb collisions at √sNN = 8.16 TeV with CMS
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier
Yazar(lar) :
Z. Shi , A. M. Sirunyan , Bora Işıldak
Konu :
Heavy flavor, Nuclear modification factor, Energy loss mechanism, Elliptic flow, Small systems
Yıl :
2019
Nuclear Physics A
Yayıncı Web Sitesi
Tam Metin
Kaydet
The study of charm production in heavy-ion collisions is considered an excellent probe for the properties of the hot and dense medium created in heavy-ion collisions. Measurements of D-0-meson nuclear modification factor can provide strong constraints into the mechanisms of in-medium energy loss and charm flow in the medium. The measurement of D-0-meson elliptic flow in pPb collisions helps us understand the strength of charm quarks coupling to significantly reduced systems which demonstrate hydrodynamic properties. In this paper, the measurements of the D-0-meson nuclear modification factor in PbPb collisions at 5.02 TeV together with the new measurement of D-0-meson elliptic flow in high multiplicity pPb collisions at 5.02 TeV using the two-particle correlation method will be presented.
Anahtar Kelimeler : Article

ISSN: 0375-9474
Sınıflandırma :
15
Search for the chiral magnetic effect at the LHC with the CMS experiment
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak 1:
DSpace Makaleler
Kaynak 2:
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier
Yazar(lar) :
Karamanoğlu Mehmetbey Üniversitesi
Konu :
CME, Small Systems, Particle Correlation, Event Shape Engineering
Yıl :
2019
Nuclear Physics A
Tam Metin
Kaydet
Searches for the chiral magnetic effect (CME) using charge-dependent azimuthal correlations with respect to event planes are presented in PbPb collisions at 5.02 TeV and pPb collisions at 5.02 and 8.16 TeV, with the CMS experiment at the LHC. The azimuthal correlations with respect to the second- and third-order event planes are explored as a function of pseudorapidity, transverse momentum, and event multiplicity, which provides new insights into the underlying background correlations. By employing an event-shape engineering technique, a linear dependence of charge-dependent correlations on the second-order anisotropy flow (nu(2)) is observed, and the upper limits on the nu(2)-independent fraction, which is directly related to the CME signal, are obtained at 95% confidence level for both pPb and PbPb collisions. These results provide strong constraints on the search for the chiral magnetic effect at LHC energies, and establish new guidelines for searches in future experiments.
Anahtar Kelimeler : CME, Small Systems, Particle Correlation, Event Shape Engineering, article
Cilt: 982
ISSN: 0375-9474
Sınıflandırma :
16
Beyond nPDFs effects : Prompt J/psi and psi(2S) production in pPb and pp collisions
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier
Yazar(lar) :
Karamanoğlu Mehmetbey Üniversitesi
Konu :
Quarkonia, Charmonia, Prompt Jpsi, Prompt psi(2S), Production
Yıl :
2019
Nuclear Physics A
Yayıncı Web Sitesi
Tam Metin
Kaydet
A multi-dimensional analysis of prompt charmonia in pp and pPb collisions at root s(NN) = 5.02 TeV with the CMS detector is presented. The pPb differential cross-sections of prompt J/psi are shown in a wide kinematic region, for transverse momentum p(T) spanning from 2 to 30 GeV/c and a rapidity interval between -2.4 to 1.93 in the center of mass of the collision. The final results on prompt psi/(2S) meson production cross section in pp and pPb collisions at 5.02 TeV are also reported as a function of p(T) and rapidity, for p(T) from 4 to 30 GeV/c. The nuclear modification factor is found to be smaller than that of prompt J/psi in all measured bins, especially at low p(T) and at backward rapidity. Such a different behaviour between the ground and excited states cannot be reproduced considering nPDF effects alone.
Anahtar Kelimeler : Quarkonia, Charmonia, Prompt Jpsi, Prompt psi(2S), Production, article
Cilt: 982
ISSN: 0375-9474
Sınıflandırma :
17
Evidence for light-by-light scattering in ultraperipheral PbPb collisions at root S-NN=5.02 TeV
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak 1:
DSpace Makaleler
Kaynak 2:
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier
Yazar(lar) :
Karamanoğlu Mehmetbey Üniversitesi
Konu :
Light-By-Light Scattering, Heavy Ions, Ultraperipheral Collisions, CMS, LHC
Yıl :
2019
Nuclear Physics A
Tam Metin
Kaydet
Evidence for light-by-light (LbL) scattering, gamma gamma -> gamma gamma, in ultraperipheral PbPb collisions at a nucleon-nucleon center of-mass energy of 5.02 TeV is reported. LbL scattering processes are selected in events with just two photons produced, with transverse energy E-T(gamma) > 2 GeV, pseudorapidity vertical bar eta(gamma)vertical bar < 2.4; and diphoton invariant mass m(gamma gamma) > 5 GeV, transverse momentum p(T)(gamma gamma) < 1 GeV, and acoplanarity (1 - Delta phi(gamma gamma)/pi) < 0.01. After all selection criteria, 14 events are observed, compared to 11.1 +/- 1.1 (theo) and 3.8 +/- 1.3 (stat) events expected for signal and background processes respectively. The significance of the signal excess over the background-only hypothesis is 4.10 sigma. The measured fiducial LbL scattering cross section, sigma(fid)(gamma gamma -> gamma gamma) = 122 +/- 46 (stat) +/- 29 (syst) +/- 4 (theo) nb is consistent with the standard model prediction.
Anahtar Kelimeler : Light-By-Light Scattering, Heavy Ions, Ultraperipheral Collisions, CMS, LHC, article
Cilt: 982
ISSN: 0375-9474
18
The HypHI Phase 0 experiment
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
NUCLEAR PHYSICS A
Yayıncı:
ELSEVIER SCIENCE BV
Yazar(lar) :
T. R. Saito , S. Bianchin , O. Borodina , V. Bozkurt , B. Gokuzum , M. Kavatsyuk , T. Aumann
Konu :
hypernuclear spectroscopy, heavy ion induced reaction, invariant mass
Yıl :
2010
NUCLEAR PHYSICS A
Yayıncı Web Sitesi
Kaydet
The HypHI Phase 0 experiment to demonstrate the feasibility of precise hypernuclear spectroscopy with induced reactions of heavy ion beams was performed at GSI in August and October in 2009, with a projectile of Li-6 at 2 A GeV impinged on carbon graphite target with a thickness of 8 g/cm(2). The experiment mainly aims to reconstruct events of H-3(Lambda), H-4(Lambda) and He-5(Lambda) by observing the pi(-) decay channel. Details of the HypHI Phase 0 experiment performed in August in 2009 will be discussed.
Anahtar Kelimeler : hypernuclear spectroscopy, heavy ion induced reaction, invariant mass, article
Cilt: 835
Sayı: 1.Nis
ISSN: 0375-9474
Sınıflandırma :
19
Multiparticle correlations and higher order harmonics in pPb collisions at root s(NN)=8.16 TeV
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier
Yazar(lar) :
Quan Wang , A. M. Sirunyan , A. Tumasyan , W. Adam , F. Ambrogi , E. Asilar , T. Bergauer
Konu :
CMS, heavy ion, cumulant, flow, collectivity, small system, quark-gluon plasma
Yıl :
2019
Nuclear Physics A
Yayıncı Web Sitesi
Kaydet
The elliptic and higher-order azimuthal anisotropy Fourier harmonics (v(n)) are obtained for pPb collisions at root s(NN) = 8.16 TeV over a wide range of event multiplicities based on multiparticle correlations. The data were collected by the CMS experiment during the 2016 LHC run. A sample of peripheral PbPb collisions at root s(NN) = 5.02 TeV covering a similar range of event multiplicities to the pPb results is also analyzed for comparison. The ratios of different harmonic moments are obtained for both v(2) and v(3) with high precision, which allows a direct comparison to theoretical predictions assuming a hydrodynamic evolution of the created medium with initial-state density fluctuations, particularly probing the non-Gaussian nature of initial-state fluctuations in small collision systems. The presented results provide crucial insights into the origin of collective long-range correlations observed in small collision systems.
Anahtar Kelimeler : CMS, heavy ion, cumulant, flow, collectivity, small system, quark-gluon plasma, article
Cilt: 982
ISSN: 0375-9474
Sınıflandırma :
20
Odd mass nuclei in the mass regions 100 ? A ? 130 from a vertical perspective within the NpNn scheme
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier B.V.
Yazar(lar) :
Sayğı B.
Konu :
Even–odd nuclei, Level schemes, NpNn scheme, n–p interaction, Odd–even nuclei, Pseudo-mirror nuclei
Yıl :
2019
Nuclear Physics A
Yayıncı Web Sitesi
Kaydet
We present here the symmetrical level schemes of odd mass pseudo-mirror nuclei for the first time within NpNn scheme. Pseudo-mirror nuclei having particle-hole symmetry are to reflect similar experimental structures, where the NpNn quantity is an indicator of the pronounced symmetry. In the light of available data, the 125Cs–107Rh, 123Cs–109Rh, 127La–105Tc, 127Ce–105Mo, 123Ba–109Ru and 131Nd–101Zr nuclei have been analyzed in a vertical perspective with in the pseudo-mirror nuclei framework. The analysis of level schemes of the nuclei of interest revealed that almost degenerate quadrupole electric transitions from equal spin-parity states in even–odd and odd–even pseudo-mirror nuclei. © 2018 Elsevier B.V.
Anahtar Kelimeler : Evenu2013odd nuclei, Level schemes, NpNn scheme, nu2013p interaction, Oddu2013even nuclei, Pseudo-mirror nuclei, article
Cilt: 983
ISSN: 0375-9474
Sınıflandırma :
21
Fragmentation of J/ψ in jets in pp collisions at √s = 5.02 TeV
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier
Yazar(lar) :
B. Diab , A. M. Sirunyan , Bora Işıldak
Konu :
CMS, Jψ, Jets, Pp collisions
Yıl :
2019
Nuclear Physics A
Yayıncı Web Sitesi
Tam Metin
Kaydet
The fragmentation of jets containing a J/psi meson is studied in root s = 5.02 TeV pp data using an integrated luminosity of L = 27.39 pb(-1). The fraction of the jet transverse momentum p(Tjet) carried by the J/psi is measured for prompt J/psi and J/psi coming from b hadron decays, named nonprompt. Whereas the fragmentation function of nonprompt J/psi is well-modeled by simulations using a Monte Carlo generator, the prompt J/psi are found to be accompanied by a larger level of jet activity. The fraction of J/psi mesons that are produced inside a jet is also reported, and found to be larger in data than in simulation, for both prompt and nonprompt J/psi.
Anahtar Kelimeler : Article

ISSN: 0375-9474
Sınıflandırma :
22
Fragmentation of J/psi in jets in pp collisions at root s=5.02 TeV Batoul Diab for the CMS collaboration
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Nuclear Physics A
Yayıncı:
Elsevier
Yazar(lar) :
Karamanoğlu Mehmetbey Üniversitesi
Konu :
CMS, Jpsi, Jets, PP Collisions
Yıl :
2019
Nuclear Physics A
Yayıncı Web Sitesi
Tam Metin
Kaydet
The fragmentation of jets containing a J/psi meson is studied in root s = 5.02 TeV pp data using an integrated luminosity of L = 27.39 pb(-1). The fraction of the jet transverse momentum p(Tjet) carried by the J/psi is measured for prompt J/psi and J/psi coming from b hadron decays, named nonprompt. Whereas the fragmentation function of nonprompt J/psi is well-modeled by simulations using a Monte Carlo generator, the prompt J/psi are found to be accompanied by a larger level of jet activity. The fraction of J/psi mesons that are produced inside a jet is also reported, and found to be larger in data than in simulation, for both prompt and nonprompt J/psi.
Anahtar Kelimeler : CMS, Jpsi, Jets, PP Collisions, article
Cilt: 982
ISSN: 0375-9474
Sınıflandırma :
23
Production of hypernuclei in peripheral HI collisions: The HypHI project at GSI
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
NUCLEAR PHYSICS A
Yayıncı:
ELSEVIER SCIENCE BV
Yazar(lar) :
T. R. Saito , D. Nakajima , C. Rappold , S. Bianchin , O. Borodina , V. Bozkurt , P. Achenbach
Konu :
Hypernuclear spectroscopy, Heavy ion induced reaction, Invariant mass
Yıl :
2012
NUCLEAR PHYSICS A
Yayıncı Web Sitesi
Kaydet
The HypHI Phase 0 experiment with Li-6 projectiles at 2 A GeV on a carbon target has been performed at GS' in order to demonstrate the feasibility of precise hypernuclear spectroscopy with peripheral heavy ion collisions. Current data analyses have preliminary shown peaks in invariant mass distributions of p + pi(-) for Lambda, He-3 + pi(-) for H-3(Lambda) and He-4 + pi(-) for H-4(Lambda). Lifetime values for the corresponding peaks have been also deduced, which is in good agreement with the former known values. (C) 2012 Elsevier B.V. All rights reserved.
Anahtar Kelimeler : Hypernuclear spectroscopy, Heavy ion induced reaction, Invariant mass, article
Cilt: 881
ISSN: 0375-9474
Sınıflandırma :
24
Deformation effects on cluster decays of radium isotopes
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
NUCLEAR PHYSICS A
Yayıncı:
ELSEVIER SCIENCE BV
Yazar(lar) :
A. Soylu , S. Evlice
Konu :
Heavy cluster decay, Half-lives, WKB method, Deformation, Radium isotopes
Yıl :
2015
NUCLEAR PHYSICS A
Yayıncı Web Sitesi
Kaydet
We systematically investigate the influence of nuclear deformations of the cluster and daughter nuclei on the half-lives of He-4, Be-8,Be-10, C-12,C-14,C-16 and O-16,O-18,O-20,O-22 cluster decays from Ra210-226. The Wentzel-Kramers-Brillouin (WKB) method and Bohr-Sommerfeld quantization condition with the deformed squared Woods-Saxon and Cosh potentials are used phenomenologically in order to compute the half-lives. The calculations are performed for the spherical cluster and deformed daughter, deformed cluster and spherical daughter and deformed cluster and daughter cases. The half-lives for different orientation angles as well as over all angles are calculated, in order to show the deformation effects on the systems. In cases where the deformation of both cluster and daughter effect the result, it is found that the deformation of the cluster is more important than the deformation of the daughter. Furthermore, it is also found that taking into account the orientation angles of the daughter and cluster also improves the results when compared to experiment. However, the results for a Cosh potential with certain parameters without any deformation are found to be more compatible with both the results obtained by the Coulomb and proximity potential model (CPPM) and the universal formula for cluster decay (UNIV), as well as the experimental values for He-4 and C-14 decays. The results provide a useful method for estimating the unknown experimental half-lives of possible exotic decays from Ra isotopes. (C) 2015 Elsevier B.V. All rights reserved.
Anahtar Kelimeler : Heavy cluster decay, Half-lives, WKB method, Deformation, Radium isotopes, article
Cilt: 936
ISSN: 0375-9474
Sınıflandırma :
25
Summary of the HypHI Phase 0 experiment and future plans with FRS at GSI (FAIR Phase 0)
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
NUCLEAR PHYSICS A
Yayıncı:
ELSEVIER SCIENCE BV
Yazar(lar) :
T. R. Saito , C. Rappold , O. Bertini , S. Bianchin , V. Bozkurt , H. Geissel , B. Oezel-Tashenov
Konu :
Hypernuclear spectroscopy, Heavy ion induced reaction, Invariant mass, Lifetime measurement, FRS, Super-FRS, RI-beam
Yıl :
2016
NUCLEAR PHYSICS A
Yayıncı Web Sitesi
Kaydet
Results of the HypHI Phase 0 experiment with the reaction of Li-6+C-12 at 2 A GeV are summarised. Invariant mass distributions as well as,the lifetime measurements for H-3(Lambda) and H-4(Lambda) are discussed. The lifetime values for both the hypernuclei are respectively observed to be 18(-32)(+42) ps and 140(-33)(+48) ps, being significantly shorter than those of the Lambda-hyperon. Statistical analyses of existing lifetime data for H-3(Lambda) up to 2014 confirm a significantly short lifetime of H-3(Lambda), which is not explained by present models. Observed hypernuclear production cross section values for H-3(Lambda) and H-4(Lambda) are also summarised. In addition, observed signals for the final states of d + pi(-) and t + pi(-) are discussed. All the discussions on the results of the HypHI Phase 0 experiment in this article are based on [1-4]. We also present a new proposed experiment with the FRS (FRagment Separator) at GSI (FAIR Phase 0) to improve the precision of the hypernuclear spectroscopy with peripheral heavy ion induced reactions. (C) 2016 Elsevier B.V. All rights reserved.
Anahtar Kelimeler : Hypernuclear spectroscopy, Heavy ion induced reaction, Invariant mass, Lifetime measurement, FRS and Super-FRS, RI-beam, article
Cilt: 954
ISSN: 0375-9474
Sınıflandırma :

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