Nuclear Theory·nucl-th

Thursday·June 16, 2022

7 papers—4 primary·3 cross-listed

01
[Submitted on 14 Jun 2022]
Semi-local nuclear forces from chiral EFT: State-of-the-art & challenges
E. Epelbaum🇩🇪 · H. Krebs🇩🇪 · P. Reinert🇩🇪
Recently, a new generation of nuclear forces has been developed in the framework of chiral EFT. An important feature of these potentials is a novel semi-local regularization approach that combines the advantages of a local regulator for long-range interactions with the convenience of an angle-independent nonlocal regulator for contact interactions. The authors discuss the key features of the semi-local two-nucleon potentials and demonstrate their outstanding performance in the two-nucleon sector by showing selected results up to fifth order in the EFT expansion. Also reviewed are applications to heavier systems, which are currently limited to third chiral order. This limitation reflects the conceptual difficulty in constructing a consistently regularized many-body forces and current operators and affects all currently available interactions. The authors outline possible ways to tackle this problem and discuss future directions in the field.
Comments:
24 pages, 9 figures, 5 tables, 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:
2206.07072 [pdf]
18 citations
02
[Submitted on 14 Jun 2022]
Precision tests of the nonlinear mode coupling of anisotropic flow via high-energy collisions of isobars
Jiangyong Jia🇺🇸 · Giuliano Giacalone🇩🇪 · Chunjian Zhang🇺🇸
Valuable information on the dynamics of expanding fluids can be inferred from the response of such systems to perturbations in their initial geometry. We apply this technique in high-energy $^{96}$ Ru+ $^{96}$ Ru and $^{96}$ Zr+ $^{96}$ Zr collisions to scrutinize the expansion dynamics of the quark-gluon plasma, where the initial geometry perturbations are sourced by the differences in deformations and radial profiles between $^{96}$ Ru and $^{96}$ Zr, and the collective response is captured by the change in anisotropic flow $V_{n}$ between the two collision systems. Using a transport model, we analyze how the nonlinear coupling between lower-order flow harmonics $V_{2}$ and $V_{3}$ to the higher-order flow harmonics $V_{4}$ and $V_{5}$ , expected to scale as $V_{4 NL} = χ_{4} V_{2}^{2}$ and $V_{5 NL} = χ_{5} V_{2} V_{3}$ , gets modified as one moves from $^{96}$ Ru+ $^{96}$ Ru to $^{96}$ Zr+ $^{96}$ Zr systems. We find that these scaling relations are valid to high precision: variations of order 20\% in $V_{4 NL}$ and $V_{5 NL}$ due to differences in quadrupole deformation, octupole deformation, and nuclear skin modify $χ_{4}$ and $χ_{5}$ by about 1--2\%. Percent-level deviations are however larger than the expected experimental uncertainties and could be measured. Therefore, collisions of isobars with different nuclear structures are a unique tool to isolate subtle nonlinear effects in the expansion of the quark-gluon plasma that would be otherwise impossible to access in a single collision system.
Comments:
6 pages, 3 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2206.07184 [pdf]
Chin.Phys.Lett.(2023)·24 citations
03
[Submitted on 15 Jun 2022]
Calculation of Coulomb breakup cross sections using a new Coulomb dynamical polarization potential
H. M. Maridi · K. Rusek · N. Keeley
A new method for calculating the Coulomb breakup of unstable neutron-rich isotopes at high energies is presented. The calculations employ the eikonal approximation and use a new Coulomb dynamical polarization potential (CDPP), calculated by solving the Schrödinger equation for the entire motion of the exotic projectile as a two-body cluster structure using the adiabatic approximation and incorporating excitations to the continuum. Calculations for some exotic isotopes are compared with Coulomb dissociation cross section data and found to be in good agreement.
Comments:
7 pages, 3 figures, references added, energy convolution is included, results changed slightly, two figures (calculations for two-neutron halo projectiles) deleted
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2206.07546 [pdf]
PRC(2022)·1 citation
04
[Submitted on 15 Jun 2022]
Quasideuterons in Light Nuclei
H. Müther · Praveen C. Srivastava
The role of pairing correlations for nucleon pairs with isospin $T = 1$ and $T = 0$ is investigated for nuclei in the mass region $12 \leq A \leq 42$ . For that purpose the two-nucleon densities resulting from nuclear shell-model calculations in one and two major shells are analyzed. Significant effects on the resulting energies are observed due to the formation of $T = 0$ pairs. The formation of quasi-deuterons is maximal for symmetric nuclei with $N = Z$ . The formation of $T = 0$ pairs is less sensitive to the density of single-particle states close to the Fermi energy than the $T = 1$ pairing and is relevant also for excitations across shell-closures. This robustness also explains why $T = 0$ pairing does not lead to such a clear evidence in comparing energies of neighbored nuclei as the "odd-even mass staggering" due to the formation of $T = 1$ pairing.
Comments:
8 pages, 5 figure
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2206.07612 [pdf]
J.Phys.G(2023)·1 citation
05
[Submitted on 14 Jun 2022] (cross-list from nucl-ex)
The Decay Q Value of Neutrinoless Double Beta Decay
Dongming Mei🇺🇸 · Wenzhao Wei🇺🇸
An earlier publication "The implication of the atomic effects in neutrinoless double beta (0 $ν β β$ ) decay" written by Mei and Wei has motivated us to compare the decay Q value ( $Q_{β β}$ ) derived from the decay of the parent nucleus to the daughter nucleus with the two ejected beta particles in the final state to the $Q_{β β}$ directly derived from the decay of the initial neutral atom to the final state of double-ionized daughter ion with the two ejected beta particles in the final state. We show that the results are the same, which is the mass-energy difference ( $Δ M c^{2}$ ) subtracted by the total difference of the atomic electron binding energy ( $Δ E_{b}$ ) between the ground states of initial and final neutral atoms. We demonstrate that $Δ M c^{2}$ is the sum of $Q_{β β}$ and the atomic relaxation energy ( $Δ E_{b}$ ) of the atomic structure after the decay. Depending on the atomic relaxation time, the release of the atomic binding energy may not come together with the energy deposition of the two ejected beta particles.
Comments:
5 pages and 3 figures
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2206.07151 [pdf]
NPA(2023)·2 citations
06
[Submitted on 15 Jun 2022] (cross-list from math-ph)
Wave function asymptotics for scattering of three-particles with Coulomb interaction
S. L. Yakovlev
The coordinate asymptotics of the wave function for the problem of scattering of three particles with Coulomb interaction is constructed. Representation of hyperspherical functions is used to reduce the Schrödinger equation to a system of partial wave one-dimensional equations. Asymptotic solutions of this system are constructed by direct asymptotic methods.
Comments:
6 pages
Subjects:
Mathematical Physics (math-ph); math.MP (math.MP); Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
arXiv:
2206.07374 [pdf]
JETP Letters, 2022, Vol. 116, No. 4, pp. …·3 citations
07
[Submitted on 15 Jun 2022] (cross-list from hep-ph)
Unpolarized Transverse Momentum Distributions from a global fit of Drell-Yan and Semi-Inclusive Deep-Inelastic Scattering data
Alessandro Bacchetta🇮🇹 · Valerio Bertone🇫🇷 · Chiara Bissolotti🇮🇹 · Giuseppe Bozzi🇮🇹 · Matteo Cerutti🇮🇹 · Fulvio Piacenza🇮🇹 · Marco Radici🇮🇹 · Andrea Signori🇮🇹
We present an extraction of unpolarized transverse-momentum-dependent parton distribution and fragmentation functions based on more than two thousands data points from several experiments for two different processes: semi-inclusive deep-inelastic scattering and Drell-Yan production of lepton pairs. The baseline analysis is performed with a Monte Carlo replica method resumming large logarithms at N3LL accuracy. The resulting description of the data is very good ( $χ^{2} / N_{dat} = 1.06$ ). For semi-inclusive deep-inelastic scattering, predictions for multiplicities are normalized by factors that cure the discrepancy with data introduced by higher-order perturbative corrections.
Comments:
Version accepted for publication. Results unchanged, only some clarifications have been added
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2206.07598 [pdf]
JHEP(2022)·197 citations

Affiliations

first authorsco-authorsvia INSPIRE

Semi-local nuclear forces from chiral EFT: State-of-the-art & challenges

Precision tests of the nonlinear mode coupling of anisotropic flow via high-energy collisions of isobars

Calculation of Coulomb breakup cross sections using a new Coulomb dynamical polarization potential

Quasideuterons in Light Nuclei

The Decay Q Value of Neutrinoless Double Beta Decay

Wave function asymptotics for scattering of three-particles with Coulomb interaction

Unpolarized Transverse Momentum Distributions from a global fit of Drell-Yan and Semi-Inclusive Deep-Inelastic Scattering data

Affiliations