Nuclear Theory·nucl-th

Thursday·October 8, 2015

9 papers—6 primary·3 cross-listed

01
Ground state properties of even-even and odd Nd,Ce and Sm isotopes in Hartree-Fock-Bogoliubov method
Younes El Bassem · Mustapha Oulne
In this work, we have studied ground-state properties of both even-even and odd Nd isotopes within Hartree-Fock-Bogoliubov method with SLy5 Skyrme force in which the pairing strength has been generalized with a new proposed formula. We calculated bind- ing energies, two-neutron separation energies, quadrupole deformation, charge, neutron and proton radii. Similar calculations have been carried out for Ce and Sm in order to verify the validity of our pairing strength formula. The results have been compared with available experimental data, the results of Hartree-Fock-Bogoliubov calculations based on the D1S Gogny effective nucleon-nucleon interaction and predictions of some nuclear models such as Finite Range Droplet Model (FRDM) and Relativistic Mean Field (RMF) theory.
nucl-thIJMPE(2015)·16 citations
02
Nuclear Physics from Lattice Quantum Chromodynamics
Martin J. Savage🇺🇸
Quantum Chromodynamics and Quantum Electrodynamics, both renormalizable quantum field theories with a small number of precisely constrained input parameters, dominate the dynamics of the quarks and gluons - the underlying building blocks of protons, neutrons, and nuclei. While the analytic techniques of quantum field theory have played a key role in understanding the dynamics of matter in high energy processes, they encounter difficulties when applied to low-energy nuclear structure and reactions, and dense systems. Expected increases in computational resources into the exascale during the next decade will provide the ability to determine a range of important strong interaction processes directly from QCD using the numerical technique of Lattice QCD. This will complement the nuclear physics experimental program, and in partnership with new thrusts in nuclear many-body theory, will enable unprecedented understanding and refinement of nuclear forces and, more generally, the visible matter in our universe. In this presentation, I will discuss the state-of-the-art Lattice QCD calculations of quantities of interest in nuclear physics, progress that is expected in the near future, and the anticipated impact.
nucl-thhep-lathep-ph11 citations
03
Theory status of quarkonium production in proton-nucleus collisions
J.P. Lansberg🇫🇷
I give a brief overview of the recent theoretical progress in the study of quarkonium production in proton-nucleus collisions in view of the recent LHC and RHIC results. A special emphasis is put on the excited states such as the psi', Upsilon(2S) and Upsilon(3S).
nucl-thhep-exhep-phnucl-exJ.Phys.Conf.Ser.(2016)·4 citations
04
The neutron skin thickness from the measured electric dipole polarizability in $^{68}$ Ni, $^{120}$ Sn, and $^{208}$ Pb
X. Roca-Maza · X. Viñas · M. Centelles · B. K. Agrawal · G. Colo' · N. Paar · J. Piekarewicz · D. Vretenar
The information on the symmetry energy and its density dependence is deduced by comparing the available data on the electric dipole polarizability $α_{D}$ of $^{68}$ Ni, $^{120}$ Sn, and $^{208}$ Pb with the predictions of the Random Phase Approximation, using a representative set of nuclear energy density functionals. The calculated values of $α_{D}$ are used to validate different correlations involving $α_{D}$ , the symmetry energy at the saturation density $J$ , the corresponding slope parameter $L$ and the neutron skin thickness $Δ r_{n p}$ , as suggested by the Droplet Model. A subset of models that reproduce simultaneously the measured polarizabilities in $^{68}$ Ni, $^{120}$ Sn, and $^{208}$ Pb are employed to predict the values of the symmetry energy parameters at saturation density and $Δ r_{n p}$ . The resulting intervals are: $J = 30 - 35$ MeV, $L = 20 - 66$ MeV; and the values for $Δ r_{n p}$ in $^{68}$ Ni, $^{120}$ Sn, and $^{208}$ Pb are in the ranges: 0.15\text{-}0.19 fm, 0.12\text{-}0.16 fm, and 0.13\text{-}0.19 fm, respectively. The strong correlation between the electric dipole polarizabilities of two nuclei is instrumental to predict the values of electric dipole polarizabilities in other nuclei.
nucl-thPRC(2015)·266 citations
05
High-spin structures of the near-spherical nuclei $^{91, 92}$ Zr
P.C. Srivastava
In the present work, we have interpreted recently available experimental data for high-spin states of the near-spherical nuclei $^{91, 92}$ Zr, using the shell-model calculations within the full $f_{5/2}$ , $p_{3/2}$ , $p_{1/2}$ , $g_{9/2}$ model space for protons and valence neutrons in $g_{9/2}$ , $g_{7/2}$ , $d_{5/2}$ orbits. We have employed a truncation for the neutrons due to huge matrix dimensions, by allowing one neutron excitation from $g_{9/2}$ orbital to $d_{5/2}$ and $g_{7/2}$ orbitals. Results are in good agreement with the available experimental data. Thus, theoretically, we have identified the structure of many high-spin states, which were tentatively assigned in the recent experimental work. The $^{91}$ Zr $21/ 2^{+}$ isomer lies at low-energy region due to fully aligned spins of two $g_{9/2}$ protons and one $d_{5/2}$ neutron.
nucl-thActa Phys.Polon.B(2017)·0 citations
06
Heavy hypernuclei with $A = 3$ in a relativistic quark-gluon model
S.M. Gerasyuta🇷🇺 · E.E. Matskevich🇷🇺
We generalized our approach to the hypernuclei with $A = B = 3$ containing one charm or one bottom quark. We derive the relativistic nine-quark equations using the dispersion relation technique. The hypernuclei as the system of interacting quarks and gluons are considered. The relativistic nine-quark amplitudes of hypernuclei, including the constituent quarks with the charm or bottom are calculated. The approximate solutions of these equations are obtained using a method based on the extraction of leading singularities of the amplitudes. The poles of the multiquark amplitudes allow us to determine the masses and the binding energy of hypernuclei with the $A = 3$ . We predict the mass spectrum of hypernuclei with $A = 3$ , which is valuable to further experimental study of the hypernuclei with charm and bottom.
nucl-thhep-ph0 citations

Affiliations

first authorsco-authorsvia INSPIRE

Ground state properties of even-even and odd Nd,Ce and Sm isotopes in Hartree-Fock-Bogoliubov method

Nuclear Physics from Lattice Quantum Chromodynamics

Theory status of quarkonium production in proton-nucleus collisions

The neutron skin thickness from the measured electric dipole polarizability in 68Ni, 120Sn, and 208Pb

High-spin structures of the near-spherical nuclei 91,92Zr

Heavy hypernuclei with A=3 in a relativistic quark-gluon model

Affiliations

The neutron skin thickness from the measured electric dipole polarizability in $^{68}$ Ni, $^{120}$ Sn, and $^{208}$ Pb

High-spin structures of the near-spherical nuclei $^{91, 92}$ Zr

Heavy hypernuclei with $A = 3$ in a relativistic quark-gluon model