Nuclear Theory·nucl-th

Tuesday·April 5, 2022

22 papers—9 primary·13 cross-listed

01
[Submitted on 2 Apr 2022]
Microscopic origin of shape coexistence in the N=90, Z=64 region
Dennis Bonatsos · K.E. Karakatsanis · Andriana Martinou · T.J. Mertzimekis · N. Minkov
A microscopic explanation of the nature of shape coexistence in the N=90, Z=64 region is suggested, based on calculations of single particle energies through standard covariant density functional theory. It is suggested that shape coexistence in the N=90 region is caused by the protons, which create neutron particle-hole (p-h) excitations across the N=112 3-dimensional isotropic harmonic oscillator (3D-HO) magic number, signaling the start of the occupation of the 1i13/2 intruder orbital, which triggers stronger proton-neutron interaction, causing the onset of the deformation and resulting in the shape/phase transition from spherical to deformed nuclei described by the X(5) critical point symmetry. A similar effect is seen in the N=60, Z=40 region, in which p-h excitations across the N=70 3D-HO magic number occur, signaling the start of the occupation of the 1h11/2 intruder orbital.
Comments:
6 pages, 7 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2204.00805 [pdf]
PLB(2022)·19 citations
02
[Submitted on 2 Apr 2022]
Nuclear structure properties of Si and P isotopes with the microscopic effective interactions
Priyanka Choudhary · Praveen C. Srivastava
In the present work, we have reported comprehensive study of the $s d$ -shell nuclei Si and P with neutron number varying from $N = 9$ to $N = 20$ using the microscopic effective valence shell interactions, namely, N3LO, JISP16 and DJ16A. These effective $s d$ -shell interactions are developed using the \textit{ab initio} no-core shell model wave functions and the Okubo-Lee-Suzuki transformation method. For comparison, we have also performed shell model calculations with the empirical USDB interaction. Energy spectra and electromagnetic properties of these isotopic chains have been studied. Theoretically calculated shell model results are compared with the available experimental data, to check the predictive strength of these microscopic interactions. It is found that the binding energies of the ground states are better reproduced with the DJ16A interaction as compared to other microscopic interactions and a proton subshell closure at $Z = 14$ is obtained in Si. Spin-tensor decomposition of two-body interaction is presented to understand the contributions from central, vector and tensor components into these interactions. Spectroscopic strengths of $^{23}$ Al( $d$ , $n$ ) $^{24}$ Si are examined for the newly performed experiment at NSCL.
Comments:
28 pages, 7 figures, 3 tables
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2204.00918 [pdf]
NPA(2023)·7 citations
03
[Submitted on 2 Apr 2022]
Energy-independent complex single $P$ -waves $N N$ potential from Marchenko equation
N. A. Khokhlov🇷🇺
We extend our previous results of solving the inverse problem of quantum scattering theory (Marchenko theory, fixed- $l$ inversion). In particular, we apply an isosceles triangular-pulse function set for the Marchenko equation input kernel expansion in a separable form. The separable form allows a reduction of the Marchenko equation to a system of linear equations for the output kernel expansion coefficients. We show that in the general case of a single partial wave, a linear expression of the input kernel is obtained in terms of the Fourier series coefficients of $q^{1 - m} (1 - S (q))$ functions in the finite range of the momentum $0 \leq q \leq π / h$ [ $S (q)$ is the scattering matrix, $l$ is the angular orbital momentum, $m = 0, 1, \dots, 2 l$ ]. Thus, we show that the partial $S$ --matrix on the finite interval determines a potential function with $h$ -step accuracy. The calculated partial potentials describe a partial $S$ --matrix with the required accuracy. The partial $S$ --matrix is unitary below the threshold of inelasticity and non--unitary (absorptive) above the threshold. We developed a procedure and applied it to partial-wave analysis (PWA) data of $N N$ elastic scattering up to 3 GeV. We show that energy-independent complex partial potentials describe these data for single $P$ -waves.
Comments:
7 pages, 6 figures. arXiv admin note: text overlap with arXiv:2112.14342
Subjects:
Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
2204.00945 [pdf]
PRC(2023)·4 citations
04
[Submitted on 3 Apr 2022]
Resonance energy and wave functions of $^{31}$ Ne: a calculation using supersymmetric quantum mechanics
M. Hasan · Md. A. Khan
In this communication, we present an efficient method for computation of energy and wave function of weakly bound nuclei by the application of supersymmetric quantum mechanics (SSQM) and bound states in continuum (BIC) technique. As a case study the scheme is implemented to the two-body ( $^{30}$ Ne + n) cluster model calculation of neutron-rich nucleus $^{31}$ Ne. Woods-Saxon central potential with spin-orbit component is used as the core-nucleon interaction. The two-body Schrödinger equation in relative coordinate is solved numerically to get the energy and wave function of the low-lying bound states. A one-parameter family of isospectral potential (IP) is constructed from the bound state solutions following algebra of SSQM to find energies and wave functions of the resonance states. In addition to the 2p $_{3/ 2^{-}}$ (-0.33 MeV) ground state, two bound excited states: s $_{1/2}$ (-0.30 MeV), $p_{1/2}$ (-0.15 MeV) are also obtained. Few low-lying resonance states: f $_{7/ 2_{1}}$ (2.57 MeV), f $_{7/ 2_{2}}$ (4.59 MeV), f $_{5/ 2_{1}}$ (5.58 MeV), p $_{1/ 2_{1}}$ (1.432 MeV), p $_{1/ 2_{2}}$ (4.165 MeV), p $_{3/ 2_{1}}$ (1.431 MeV), p $_{3/ 2_{2}}$ (4.205 MeV) are predicted. Among the predicted resonance states, the f $_{7/ 2^{-}}$ state having resonance energy $E_{R} ≃ 4.59$ MeV is in excellent agreement with the one found in the literature.
Comments:
11 Pages, 3 Tables, 5 Figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2204.01017 [pdf]
Phys.Atom.Nucl.(2023)·0 citations
05
[Submitted on 3 Apr 2022]
Multiparticle azimuthal cumulants from transverse momentum conservation and collective flow
Mu-Ting Xie🇨🇳 · Guo-Liang Ma🇨🇳 · Adam Bzdak🇵🇱
We calculate the $n$ th order of $2 k$ -particle azimuthal cumulants $c_{n} {2 k}$ based on transverse momentum conservation (TMC) and collective flow $v_{n}$ (n=2,3). We demonstrate that the TMC effect only leads to a nonzero $c_{n} {2 k}$ with the sign of $(- 1)^{nk}$ and the magnitude inversely proportional to $(N - 2 k)^{nk}$ . The interplay between TMC and collective flow can change the signs of $c_{2} {4}$ , $c_{3} {2}$ and $c_{3} {4}$ at some values of multiplicity $N$ , which could provide a good probe to study the onset of collectivity and search for the substructure of proton in small colliding systems.
Comments:
11 pages, 3 figures, final published version
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2204.01038 [pdf]
PRC(2022)·7 citations
06
[Submitted on 3 Apr 2022]
Spin and polarization: a new direction in relativistic heavy ion physics
F. Becattini (University of Florence)🇮🇹
Since the first evidence of a global polarization of $Λ$ hyperons in relativistic nuclear collisions in 2017, spin has opened a new window in the field, both at experimental and theoretical level, and an exciting perspective. The current state of the field is reviewed with regard to the theoretical understanding of the data, reporting on the most recent achievements and envisioning possible developments. The intriguing connections of spin physics in relativistic matter with fundamental questions in quantum field theory and applications in the non-relativistic domain are discussed.
Comments:
16 pages, published in Reports on Progress in Physics
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2204.01144 [pdf]
Rept.Prog.Phys.(2022)·88 citations
07
[Submitted on 4 Apr 2022]
Ab Initio Nuclear Reaction Theory with Applications to Astrophysics
Petr Navratil · Sofia Quaglioni
We present an introduction to ab initio nuclear theory with a focus on nuclear reactions. After a high-level overview of ab initio approaches in nuclear physics, we give a more detailed description of the no-core shell model technique equivalent to a large extent to configuration-interaction methods applied in quantum chemistry. We then introduce the no-core shell model with continuum approach that provides a quantum many-body description of nuclear reactions. After a brief review of nuclear reactions important for astrophysics, we present examples of results of ab initio calculations of radiative capture and transfer reactions in light nuclei.
Comments:
Contribution to the "Handbook of Nuclear Physics", Springer, 2022, edited by I. Tanihata, H. Toki, and T. Kajino
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2204.01187 [pdf]
7 citations
08
[Submitted on 4 Apr 2022]
Relativistic Spin Magnetohydrodynamics
Samapan Bhadury🇮🇳 · Wojciech Florkowski🇵🇱 · Amaresh Jaiswal🇮🇳 · Avdhesh Kumar🇮🇳 · Radoslaw Ryblewski🇵🇱
Starting from kinetic theory description of massive spin-1/2 particles in presence of magnetic field, equations for relativistic dissipative non-resistive magnetohydrodynamics are obtained in the small polarization limit. We use a relaxation time approximation for the collision kernel in the relativistic Boltzmann equation and calculate non-equilibrium corrections to the phase-space distribution function of spin-polarizable particles. We demonstrate that our framework naturally leads to emergence of the well known Einstein-de Hass and Barnett effects. We obtain multiple transport coefficients and show, for the first time, that the coupling between spin and magnetic field appear at gradient order in hydrodynamic equations.
Comments:
8+5 pages, published version
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
arXiv:
2204.01357 [pdf]
PRL(2022)·84 citations
09
[Submitted on 4 Apr 2022]
Exploring jet transport coefficients by elastic scattering in the strongly interacting quark-gluon plasma
Ilia Grishmanovskii🇩🇪 · Taesoo Song🇩🇪 · Olga Soloveva🇩🇪 · Carsten Greiner🇩🇪 · Elena Bratkovskaya🇩🇪
We study the interaction of leading jet partons in a strongly interacting quark-gluon plasma (sQGP) medium based on the effective dynamical quasi-particle model (DQPM). The DQPM describes the non-perturbative nature of the sQGP at finite temperature $T$ and baryon chemical potential $μ_{B}$ based on a propagator representation of massive off-shell partons (quarks and gluons) whose properties (characterized by spectral functions with $T, μ_{B}$ dependent masses and widths) are adjusted to reproduce the lQCD EoS for the QGP in thermodynamic equilibrium. We present the results for the jet transport coefficients, i.e. the transverse momentum transfer squared per unit length $q^$ as well as the energy loss per unit length $Δ E = d E / d x$ , in the QGP and investigate their dependence on the temperature $T$ and baryon chemical potential $μ_{B}$ as well as on jet properties such as the leading jet parton momentum, mass, flavor, and the choice of the strong coupling constant. In this first study only elastic scattering processes of a leading jet parton with the sQGP partons are explored discarding presently the radiative processes (such as gluon Bremsstrahlung). We present a comparison of our results for the elastic energy loss in the sQGP medium with the pQCD results obtained by the BAMPS and LBT models as well as with other theoretical approaches such as lattice QCD and the LO-HTL and also with estimates of $q^/ T^{3}$ by the color string percolation model (CSPM) and the JET and JETSCAPE Collaborations based on a comparison of hydrodynamical calculations with experimental heavy-ion data.
Comments:
15 pages, 9 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2204.01561 [pdf]
PRC(2022)·24 citations

Affiliations

first authorsco-authorsvia INSPIRE