Showing papers in "International Journal of Modern Physics E-nuclear Physics in 2018"
TL;DR: In this article, different decay modes of superheavy nuclei such as spontaneous fission, ternary fission and cluster decay were studied and the authors proposed a method to study these decay modes.
Abstract: It is important to study the different decay modes of superheavy nuclei such as spontaneous fission, ternary fission and cluster decay. We studied the spontaneous fission, ternary fission and clust...
43 citations
TL;DR: Embedded random matrix ensembles generated by random interactions (of low body rank and usually two-body) in the presence of a one-body mean field, introduced in nuclear structure physics, are now established to describe statistical properties of a large number of isolated finite quantum many-particle systems.
Abstract: Embedded random matrix ensembles generated by random interactions (of low body rank and usually two-body) in the presence of a one-body mean field, introduced in nuclear structure physics, are now established to be indispensable in describing statistical properties of a large number of isolated finite quantum many-particle systems Lie algebra symmetries of the interactions, as identified from nuclear shell model and the interacting boson model, led to the introduction of a variety of embedded ensembles (EEs) These ensembles with a mean field and chaos generating two-body interaction generate in three different stages, delocalization of wave functions in the Fock space of the mean-field basis states The last stage corresponds to what one may call thermalization and complex nuclei, as seen from many shell model calculations, lie in this region Besides briefly describing them, their recent applications to nuclear structure are presented and they are (i) nuclear level densities with interactions; (ii) orb
33 citations
TL;DR: The spectroscopic properties play a crucial role in understanding the structure of nuclei, in particular, the shape and shape transitions of the nuclei as discussed by the authors, and the exotic shapes of nuclear symmetric structures.
Abstract: The spectroscopic properties play a crucial role in understanding the structure of nuclei, in particular, the shape and shape transitions of nuclei. In recent years, the exotic shapes of nuclear sy...
32 citations
TL;DR: In this article, the authors review recent progress in the description of unpolarized transverse-momentum-dependent (TMD) gluon distributions at small x in the color glass condensate (CGC) effective theory.
Abstract: In this paper, we review recent progress in the description of unpolarized transverse-momentum-dependent (TMD) gluon distributions at small x in the color glass condensate (CGC) effective theory. We discuss the origin of the nonuniversality of TMD gluon distributions in the TMD factorization framework and in the CGC theory and the equivalence of the two approaches in their overlapping domain of validity. We show some applications of this equivalence, including recent results on the behavior of TMD gluon distributions at small x, and on the study of gluon saturation. We discuss recent advances in the unification of the TMD evolution and the nonlinear small-x evolution of gluon distributions.
30 citations
TL;DR: In this paper, the invariant differential yield of the charged primary particles in Pb-Pb collisions at s = 0.9TeV, 2.76TeV and 7TeV with six centrality bins was analyzed by fitting the data with exponential functions.
Abstract: We argue that pT distribution data from the LHC on the invariant differential yield of the charged primary particles in pp collisions at s = 0.9TeV, 2.76TeV, 7TeV and in Pb–Pb collisions at sNN = 2.76TeV with six centrality bins contains several pT regions with special properties. These distributions were analyzed by fitting the data with exponential functions. We conclude that the regions reflect features of fragmentation and hadronization of partons through the string dynamics. The nuclear transparency results in negligible influence of the medium in the III region (pT > 17−20GeV/c), which has highest pT values. The effects and changes by the medium start to appear weakly in the II region (4−6GeV/c < pT < 17−20GeV/c) and become stronger in the I region (pT < 4−6GeV/c). It seems that the II region has highest number of strings. The increase in string density in this region could lead to fusion of strings, appearance of a new string and collective behavior of the partons in the most central collisions. Th...
23 citations
TL;DR: In this paper, the most common descriptions for the first-order phase transition to deconfined quark matter in the core of neutron stars are reviewed, and a new description of these phase transitions in the cores of proto-neutron stars is presented, in which more constraints are enforced so as to include trapped neutrinos.
Abstract: In this paper, we review the most common descriptions for the first-order phase transition to deconfined quark matter in the core of neutron stars. We also present a new description of these phase transitions in the core of proto-neutron stars, in which more constraints are enforced so as to include trapped neutrinos. Finally, we calculate the emission of gravitational waves associated with deconfinement phase transitions, discuss the possibility of their detection, and how this would provide information about the equation of state of dense matter.
22 citations
TL;DR: In this paper, a set of empirical formulae have been proposed to calculate the α-decay half-lives from ground state to ground state transitions of 356 nuclei classified to different set of e−e, e−o, o−e and o−o i
Abstract: A set of empirical formulae have been proposed to calculate the α-decay half-lives from ground state to ground state transitions of 356 nuclei classified to different set of e–e, e–o, o–e and o–o i...
22 citations
TL;DR: Polarized electron beams have played an important role in scattering experiments at moderate to high beam energies as mentioned in this paper, and these experiments have been primarily targeted at studying hadronic materials, such as semiconductors.
Abstract: Polarized electron beams have played an important role in scattering experiments at moderate to high beam energies. Historically, these experiments have been primarily targeted at studying hadronic...
20 citations
TL;DR: In this paper, the elastic and diffractive scatterings of protons are reviewed with emphasis on the LHC data, especially those deviating from the expectations based on extrapolati...
Abstract: We review the elastic and diffractive scatterings of protons (called also the “forward physics”) with emphasis on the LHC data, especially those deviating from the expectations based on extrapolati...
19 citations
TL;DR: In this article, the hyperon couplings are fixed by reproducing their experimentally detuned detentions with an effective chiral model in mean-field approximation, which is used to construct models of neutron stars with hyperon cores.
Abstract: Models of neutron stars (NSs) with hyperon cores are constructed with an effective chiral model in mean-field approximation. The hyperon couplings are fixed by reproducing their experimentally dete...
18 citations
TL;DR: In this paper, the quiescent luminosities observed from X-ray transients in low mass Xray binaries were compared with the stellar evolutionary calculations of accreting neutron stars.
Abstract: We construct the quiescent neutron star models in the evolutionary calculations. The X-ray luminosities have been derived in terms of the time-averaged mass accretion rate for various neutron star masses and surface compositions. We compare the quiescent luminosities observed from X-ray transients in low mass X-ray binaries, where the stellar evolutionary calculations of accreting neutron stars include neutrino cooling due to strong pion condensations. Our results based on the evolutionary calculations suggest that stronger cooling process would be necessary to be consistent with observations.
TL;DR: In this paper, the ground, β and γ bands as well as the associated B(E2) values have been calculated using interacting boson model (IBM) and a new method called "new empirical equat...
Abstract: The energies of the ground, β and γ bands as well as the associated B(E2) values have been calculated using interacting boson model (IBM). We have developed a new method called “new empirical equat...
TL;DR: In this article, the gluon condensation (GC)-effects in high energy cosmic rays are investigated and it is shown that the GC may break the power-law of the cosmic ray spectra if the energy of accelerated protons exceeds the GC-threshold.
Abstract: The gluon condensation (GC)-effects in high energy cosmic rays are investigated. After a brief review of the GC, several examples including gamma-, electron- and positron-spectra in a broad GeV ∼TeV region can be explained by the GC-effects. We find that the GC may break the power-law of the cosmic ray spectra if the energy of accelerated protons exceeds the GC-threshold. The GC is a new phenomenon that is not yet known, it provides a new window to understand the high energy cosmic ray spectra.
TL;DR: In the collective spectra of atomic nuclei, the level energy E(21+) varies with atomic number Z and neutron number N as mentioned in this paper, and also the E2 decay-reduced transition probability B(E2, 01+ → 2 1+) is related t
Abstract: In the collective spectra of atomic nuclei, the level energy E(21+) varies with atomic number Z and neutron number N. Also the E2 decay-reduced transition probability B(E2, 01+ → 2 1+) is related t...
TL;DR: In this article, the half-lives of the cluster decay from the isotopes having the known experimental values, and also the branching ratios are obtained, within the framework of two-potential approach with cosh potential including with and without the isospin effects.
Abstract: The half-lives of the cluster decay (CD) from the isotopes having the known experimental values, the half-lives of the α-decay (AD) of same nuclei and also the branching ratios are obtained, within the framework of two-potential approach with cosh potential including with and without the isospin effects. Using two-potential approach and taking into account the isospin effects in the calculations decrease the rms values and they improve the results. The obtained branching ratios are in good agreement with the experimental ones for some isotopes. It is obtained that the isospin-dependent potentials have an influence on the half-lives of the cluster decays of nuclei. Present calculations would be important for predicting the experimental half-lives and branching ratios for the cluster decays of different types of isotopes.
TL;DR: In this article, the authors extend a previous study of matrix models of strength distributions to include the dipole choice and show that the transition from small v to large v has a phase transition beyond v=10, where they obtain exponentials for even n and for odd n.
Abstract: In this work, we extend a previous study of matrix models of strength distributions. We still retain the nearest neighbor coupling mode but we extend the values of the coupling parameter v. We consider extremes, from very small v to very large v. We first use the same transition operator as before 〈nT(n + 1)〉 = constant(= 1). For this case, we get an exponential decrease for small v, as expected, but we get a phase transition beyond v=10, where we get separate exponentials for even n and for odd n. We now also consider the dipole choice where 〈nT(n + 1)〉 = (n + 1).
TL;DR: In this paper, the authors apply the microscopic nuclear physics ideas to macroscopic stellar systems, and study the evolution of the compact di-stars in mass asymmetry (transfer) coordinate.
Abstract: Applying the microscopic nuclear physics ideas to macroscopic stellar systems, we study the evolution of the compact di-stars in mass asymmetry (transfer) coordinate. Depending on the internal stru...
TL;DR: In this paper, the reduced electric quadrupole transition rates have been calculated for the states of the negative parity bands in 109,111Cd nuclei using semiclassical model (SCM).
Abstract: The reduced electric quadrupole transition rates have been calculated for the states of the negative parity bands in 109,111Cd nuclei using semiclassical model (SCM). The calculated transition rate...
TL;DR: In this article, a modified version of the Gorodisskiy approach was used to simulate fission fragment mass distribution for 232Th, 238U, 237Np and 240Pu isotopes in different energies.
Abstract: Photofission of 232Th, 238U, 237Np and 240Pu isotopes are investigated. Modified version of Gorodisskiy approach that is developed to study the neutron-induced fission are employed to simulate fission fragment mass distribution for these isotopes in different energies. The effect of emitted neutron prior to scission point is studied. Peak to valley ratio is also extracted. Obtained results using this approach are compared with original Gorodisskiy model as well as available experimental data. Satisfactory agreement is achieved between theoretical and experimental data especially in medium and low γ-ray energies than original formalism of Gorodisskiy.
TL;DR: Spontaneous magnetization and magnetic susceptibility originated from the pseudovector-type four-point interaction between quarks are calculated in quark matter with zero temperature and finite qua... as discussed by the authors.
Abstract: Spontaneous magnetization and magnetic susceptibility originated from the pseudovector-type four-point interaction between quarks are calculated in quark matter with zero temperature and finite qua...
TL;DR: In this paper, the distributions of the yield of primary charged particles produced in the asymmetric p-Pb collisions at sNN = 5.02TeV were studied, and the three pseudorapidity regions were analyzed.
Abstract: We have studied the distributions of the yield of primary charged particles produced in the asymmetric p–Pb collisions at sNN = 5.02TeV for the three pseudorapidity regions: 0.3 < η < 0.8, 0.8 < η ...
TL;DR: In this paper, the nuclear mass problem is formalized in the inverse problem framework, which allows us to infer the underlying model parameters from experimental observation, rather than to predict the underlying models.
Abstract: We formalized the nuclear mass problem in the inverse problem framework. This approach allows us to infer the underlying model parameters from experimental observation, rather than to predict the o...
TL;DR: Motivated by the interrelationships found between the various symmetry energy elements of the energy density functionals (EDF) based on the Skyrme forces, possible correlations among them are exploited.
Abstract: Motivated by the interrelationships found between the various symmetry energy elements of the energy density functionals (EDF) based on the Skyrme forces, possible correlations among them are explo...
TL;DR: The Lipkin-Meshkov-Glick model as mentioned in this paper is a simple but not trivial model of a quantum many-body system which allows us to solve the manybody Schrodinger equation without making any approximation.
Abstract: The Lipkin–Meshkov–Glick is a simple, but not trivial, model of a quantum many-body system which allows us to solve the many-body Schrodinger equation without making any approximation. The model, w...
TL;DR: In this article, the β-delayed particle emission from the exotic nucleus 23Si has been studied using a detection system with silicon array and clover-type high-purity germanium (HPGe) detectors.
Abstract: The β-delayed particle emission from the exotic nucleus 23Si has been studied using a detection system with silicon array and clover-type high-purity germanium (HPGe) detectors. The β-delayed charged-particle spectrum and γ-ray spectrum were identified. The half-life of 23Si has been determined. A new β-delayed proton branch with an energy of 3811keV was observed. The β-delayed two-proton emission was confirmed.
TL;DR: The 2017 update of the discovery of nuclide project is presented in this paper, where 34 new nuclides were observed for the first time in 2017 and the assignment of six previously identified Nuclides had to be retracted.
Abstract: The 2017 update of the discovery of nuclide project is presented. 34 new nuclides were observed for the first time in 2017. However, the assignment of six previously identified nuclides had to be retracted.
TL;DR: In this article, the systematics of magnetic dipole transitions in a single j shell was examined for the nuclei 44Ti, 46Ti, and 48Cr, and the authors extended the study to large space calculations.
Abstract: In previous works, we examined the systematics of magnetic dipole transitions in a single j shell. We here extend the study to large space calculations. We consider the nuclei 44Ti, 46Ti and 48Cr. ...
TL;DR: In this paper, an improved potential for the β-part of the collective Bohr Hamiltonian was proposed, namely, a Killingbeck plus Morse potential, while the γ-part was solved for a triaxial deformation close to γ = 30∘.
Abstract: This paper proposes an improved potential for the β-part of the collective Bohr Hamiltonian, namely, a Killingbeck plus Morse potential, while the γ-part is solved for a triaxial deformation close to γ = 30∘. The Asymptotic Iteration Method is used, involving the Pekeris approximation, to calculate the energy eigenvalues and the eigenfunctions after an exact separation of the Bohr Hamiltonian into its variables is achieved. The results of these calculations are applied for energy spectra of the low-lying states and for corresponding B(E2) quadrupole transition probabilities of the 192,194,196Pt isotopes. Moreover, the results of the present solution are compared with those of the well-known Z(5) and esM models.
TL;DR: In this article, the role played by the equation of state (EoS) in the hydrodynamic evolution of the matter produced in relativistic heavy ion collisions is studied.
Abstract: We perform an extensive study of the role played by the equation of state (EoS) in the hydrodynamic evolution of the matter produced in relativistic heavy ion collisions. By using the same initial ...
TL;DR: In this paper, the spin-dependent EMC effect and the isovector EMC were investigated at the Jefferson Lab and it was shown that the predictions for the spindependent effect differ substantially within the mean-field and short-range correlation approaches.
Abstract: In the 35 years since the European Muon Collaboration announced the astonishing result that the valence structure of a nucleus was very different from that of a free nucleon, many explanations have been suggested. The first of the two most promising explanations is based upon the different effects of the strong Lorentz scalar and vector mean fields known to exist in a nucleus on the internal structure of the nucleon-like clusters which occupy shell model states. The second links the effect to the modification of the structure of nucleons involved in short-range correlations, which are far off their mass shell. We explore some of the methods which have been proposed to give complementary information on this puzzle, especially the spin-dependent EMC effect and the isovector EMC effect, both proposed by Cloet, Bentz and Thomas. It is shown that the predictions for the spin-dependent EMC effect, in particular, differ substantially within the mean-field and short-range correlation approaches. Hence, the measurement of the spin-dependent EMC effect at Jefferson Lab should give us a deeper understanding of the origin of the EMC effect and, indeed, of the structure of atomic nuclei.