Nuclear Theory·nucl-th

Tuesday·June 2, 2020

18 papers—12 primary·6 cross-listed

01
[Submitted on 29 May 2020]
Systematic Matter and Binding-Energy Distributions from a Dispersive Optical Model Analysis
C. D. Pruitt · R. J. Charity · L. G. Sobotka · M. C. Atkinson · W. H. Dickhoff
We present the first systematic nonlocal dispersive optical model analysis using both bound-state and scattering data of $^{16, 18}$ O, $^{40, 48}$ Ca, $^{58, 64}$ Ni, $^{112, 124}$ Sn, and $^{208}$ Pb. In all systems, roughly half the total nuclear binding energy is associated with the most-bound 10% of the total nucleon density. The extracted neutron skins reveal the interplay of asymmetry, Coulomb, and shell effects on the skin thickness. Our results indicate that simultaneous optical model fits of inelastic scattering and structural data on isotopic pairs are effective for constraining asymmetry-dependent nuclear structural quantities otherwise difficult to observe experimentally.
Comments:
6 pages, 3 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2006.00021 [pdf]
PRL(2020)·31 citations
02
[Submitted on 30 May 2020]
$g$ -factor and static quadrupole moment for the wobbling mode in $^{133}$ La
Q. B. Chen🇩🇪 · S. Frauendorf🇺🇸 · N. Kaiser🇩🇪 · Ulf-G. Meißner🇩🇪 · J. Meng🇨🇳
The $g$ -factor and static quadrupole moment for the wobbling mode in the nuclide $^{133}$ La are investigated as functions of the spin $I$ by employing the particle rotor model. The model can reproduce the available experimental data of $g$ -factor and static quadrupole moment. The properties of the $g$ -factor and static quadrupole moment as functions of $I$ are interpreted by analyzing the angular momentum geometry of the collective rotor, proton-particle, and total nuclear system. It is demonstrated that the experimental value of the $g$ -factor at the bandhead of the yrast band leads to the conclusion that the rotor angular momentum is $R ≃ 2$ . Furthermore, the variation of the $g$ -factor with the spin $I$ yields the information that the angular momenta of the proton-particle and total nuclear system are oriented parallel to each other. The negative values of the static quadrupole moment over the entire spin region are caused by an alignment of the total angular momentum mainly along the short axis. Static quadrupole moment differences between the wobbling and yrast band originate from a wobbling excitation with respect to the short axis.
Comments:
6 pages, 4 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2006.00259 [pdf]
PLB(2020)·26 citations
03
[Submitted on 30 May 2020]
Revisiting an extended-mean-field approach in heavy-ion collisions around the Fermi energy
G. Besse🇫🇷 · V. de la Mota🇫🇷 · E. Bonnet🇫🇷 · P. Eudes🇫🇷 · P. Napolitani🇫🇷 · Z. Basrak🇭🇷
Static and dynamical aspects of nuclear systems are described through an extended time-dependent mean-field approach. The foundations of the formalism are presented, with highlights on the estimation of average values and their corresponding dispersions. In contrast to semiclassical transport models, the particular interest of this description lies on its intrinsic quantal character. The reliability of this approach is discussed by means of stopping-sensitive observables analysis in heavy-ion collisions in the range of 20 to 120 MeV per nucleon.
Comments:
11 pages, 11 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2006.00338 [pdf]
PRC(2020)·4 citations
04
[Submitted on 31 May 2020]
Correspondence between Israel-Stewart and first-order casual and stable hydrodynamics for the boost-invariant massive case with zero baryon density
Arpan Das🇵🇱 · Wojciech Florkowski🇵🇱 · Radoslaw Ryblewski🇵🇱
Exact correspondence between Israel-Stewart theory and first-order causal and stable hydrodynamics is established for the boost-invariant massive case with zero baryon density and the same constant relaxation times used in the shear and bulk sectors. Explicit expressions for the temperature dependent regulators are given for the case of a relativistic massive gas. The stability and causality conditions known in the first-order approach are applied and one finds that one of them is violated in this case.
Comments:
7 pages, 1 figure
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2006.00536 [pdf]
PRD(2020)·19 citations
05
[Submitted on 31 May 2020]
The isoscalar features of Pygmy Dipole Resonance: a subtle game of symmetry energy
V. Baran · T. Isdraila · M. Colonna · D. I. Palade · A. I. Nicolin
The vibrational structure of the Pygmy Dipole Resonance (PDR) is investigated within a quantum many-body treatment with extended separable interactions able to encode the dependence of nuclear symmetry energy on density. A new picture of PDR is unveiled in terms of a combined dynamics of the neutron skin and of the core isovector polarization, which determines the isoscalar features of PDR while reproducing the isovector properties of Giant Dipole Resonance. The key role played by the variation with density of the symmetry energy on shaping the low-lying dipole response and its isoscalar-isovector structure is underlined. Our results provide insights for the challenge of clarifying the transition from skin oscillation to a highly bulk collective dynamics.
Comments:
6 pages, 4 figures; corrected misprints, added new references
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2006.00638 [pdf]
0 citations
06
[Submitted on 1 Jun 2020]
Muon capture rates: Evaluation within the Quasiparticle Random Phase Approximation
Fedor Simkovic🇸🇰 · Rastislav Dvornicky🇸🇰 · Petr Vogel🇺🇸
The Quasiparticle Random Phase Approximation (QRPA) is used in evaluation of the total muon capture ratesfor the final nuclei participating in double-beta decay. Several variants of the method are used, depending on the size of the single particle model space used, or treatment of the initial bound muon wave function. The resulting capture rates are all reasonably close to each other. In particular, the variant that appears to be most realistic, results in rates in good agreement with the experimental values. There is no necessity for an empirical quenching of the axial current coupling constant $g_{A}$ . Its standard value $g_{A}$ = 1.27 seems to be adequate.
Comments:
13 pages, 10 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2006.00689 [pdf]
PRC(2020)·20 citations
07
[Submitted on 1 Jun 2020]
Network structure of thermonuclear reactions in nuclear landscape
H. L. Liu · D. D. Han · Y. G. Ma · L. Zhu
Nucleosynthesis is a complex process in astro-nuclear evolution. In this work, we construct a directed multi-layer nuclear reaction network using the substrate-product method from a thermonuclear reaction database, JINA REACLIB. The network contains four layers, namely $n$ -, $p$ -, $h$ - and $r$ , corresponding to the reaction types involved in neutrons, protons, $^{4}$ He and the remainder, respectively. The degree values (i.e. numbers of reactions) for three layers of n-, p- and h- have a significant correlation with one another, and their topological structures exhibit a similar regularity. However, the $r$ -layer has a more complex topological structure than others and has less correlation with the other three layers. A software package named `mfinder' is employed to analyze the motif structure of the nuclear reaction network. We thus identify the most frequent reaction patterns of interconnections occurring among different nuclides. This work provides a novel approach to study the nuclear reaction network prevailing in the astrophysical context.
Comments:
7 pages, 6 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2006.00713 [pdf]
SCPMA(2020)·9 citations
08
[Submitted on 1 Jun 2020]
Magnetic field effects in peripheral heavy-ion collisions around 1 GeV/nucleon
X. G. Deng🇨🇳 · Y. G. Ma🇨🇳
Magnetic field effects on free nucleons are studied in peripheral collisions of $^{197}$ Au + $^{197}$ Au at energies ranging from 600 to 1500 MeV/nucleon by utilizing an isospin-dependent quantum molecular dynamics (IQMD) model. With the help of angular distributions and two-particle angular correlators, the magnetic field effect at an impact parameter of 11 fm is found to be more obvious than at an impact parameter of 8 fm. Moreover, the results suggest that with an increase in the number of peripheral collisions, protons are more easily condensed with the magnetic field. Magnetic field effects are further investigated by the ratio of free neutrons to free protons as functions of a two-particle correlator $C_{2}$ , four-particle correlator $C_{4}$ and six-particle correlator $C_{6}$ of angle $ϕ$ , rapidity $Y$ and transverse momentum $p_{T}$ . The results show that weak magnetic field effects could be revealed more clearly by these multiple-particle correlators, with the larger number of particle correlators demonstrating a clear signal. The results highlight a new method to search for weak signals using multi-particle correlators.
Comments:
7 pages, 8 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2006.00718 [pdf]
PRC(2020)·7 citations
09
[Submitted on 1 Jun 2020]
Two-proton momentum correlation from photondisintegration of $α$ -clustering light nuclei in the quasi-deuteron region
B. S. Huang · Y. G. Ma
The proton-proton momentum correlation function is constructed in three-body photo-disintegration channels from $^{12}$ C and $^{16}$ O targets in the quasi-deuteron regime within the framework of an extended quantum molecular dynamics model. Using the formula of Lednicky and Lyuboshitz (LL) for the momentum correlation function, we obtain a proton-proton momentum correlation function for the specific three-body photon-disintegration channels of $^{12}$ C and $^{16}$ O targets, which are assumed to have different initial geometric structures, and extract their respective emission source sizes for the proton-proton pair. The results demonstrate that constructing a proton-proton momentum correlation is feasible in photo-nuclear reactions, and it is sensitive to the initial nuclear structure. For future experimental studies investigating the $α$ -clustering structures of light nuclei, the present work can be used to shed light on the performance and correlation function analysis of ( $γ$ ,pp) or (e, $e^{'}$ pp) reactions.
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2006.00722 [pdf]
PRC(2020)·23 citations
10
[Submitted on 1 Jun 2020]
Strength of pairing interaction for hyperons in multistrangeness hypernuclei
Yu-Ting Rong🇨🇳 · Pengwei Zhao🇨🇳 · Shan-Gui Zhou🇨🇳
Pairing correlations play a very important role in atomic nuclei. Although several effective pairing interactions have been used in mean field calculations for nucleons, little is known about effective pairing interactions for hyperons. Based on the quark model, we propose a relationship between effective pairing interactions for hyperons and for nucleons; e.g., for $Λ$ s, the strength of the pairing interaction is 4/9 of that for nucleons. A separable pairing force of finite range which has been widely applied to describing pairing correlations in normal nuclei is used to investigate pairing effects in multi- $Λ$ Ca, Sn and Pb hypernuclei.
Comments:
17 pages, 3 figures; Phys. Lett. B, in press
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2006.00797 [pdf]
PLB(2020)·32 citations
11
[Submitted on 1 Jun 2020]
Constraining hadron-quark phase transition parameters within the quark-mean-field model using multimessenger observations of neutron stars
Zhiqiang Miao🇨🇳 · Ang Li🇨🇳 · Zhenyu Zhu🇨🇳 · Sophia Han🇺🇸
We extend the quark mean-field (QMF) model for nuclear matter and study the possible presence of quark matter inside the cores of neutron stars. A sharp first-order hadron-quark phase transition is implemented combining the QMF for the hadronic phase with "constant-speed-of-sound" parametrization for the high-density quark phase. The interplay of the nuclear symmetry energy slope parameter, $L$ , and the dimensionless phase transition parameters (the transition density $n_{trans} / n_{0}$ , the transition strength $Δ ε / ε_{trans}$ , and the sound speed squared in quark matter $c_{QM}^{2}$ ) are then systematically explored for the hybrid star proprieties, especially the maximum mass $M_{max}$ and the radius and the tidal deformability of a typical $1.4 M_{⊙}$ star. We show the strong correlation between the symmetry energy slope $L$ and the typical stellar radius $R_{1.4}$ , similar to that previously found for neutron stars without a phase transition. With the inclusion of phase transition, we obtain robust limits on the maximum mass ( $M_{max} < 3.6 M_{⊙}$ ) and the radius of $1.4 M_{⊙}$ stars ( $R_{1.4} ≳ 9.6 km$ ), and we find that a too-weak ( $Δ ε / ε_{trans} ≲ 0.2$ ) phase transition taking place at low densities $≲ 1.3 - 1.5 n_{0}$ is strongly disfavored. We also demonstrate that future measurements of the radius and tidal deformability of $\sim 1.4 M_{⊙}$ stars, as well as the mass measurement of very massive pulsars, can help reveal the presence and amount of quark matter in compact objects.
Comments:
15 pages, 12 figures, 1 table, version accepted for publication in ApJ
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR)
arXiv:
2006.00839 [pdf]
ApJ(2020)·56 citations
12
[Submitted on 1 Jun 2020]
Modification of tensor force in \textit{p}-shell effective interaction
Kanhaiya Jha · Pawan Kumar · Shahariar Sarkar · P. K. Raina
In many shell model interactions, the tensor force monopole matrix elements often retain systematic trends originating in the bare tensor force. However, in the present work, we find that Isospin T = 0 tensor force monopole matrix elements of \textit{p}-shell effective interaction CK(8-16) do not share these systematic. We correct these discrepancies by modifying T = 0 tensor force two-body matrix elements (TBMEs) of CK(8-16) by the analytically calculated tensor force TBMEs. With some additional modification of single-particle energies and TBMEs, the revised effective interaction is named as CKN. The effective interaction CKN has been tested for the calculations of \textit{p}-shell nuclei of normal parity states from various physics viewpoints such as excitation spectra, electromagnetic moments, and electromagnetic and \textit{G}amow-\textit{T}eller (\textit{GT}) transitions. The obtained results are found to be satisfactory.
Comments:
21 pages, 10 figures, 6 tables
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2006.00889 [pdf]
IJMPE(2020)·3 citations
13
[Submitted on 29 May 2020] (cross-list from hep-ph)
Effects of Longitudinal Short-Distance Constraints on the Hadronic Light-by-Light Contribution to the Muon $g - 2$
Jan Lüdtke🇦🇹 · Massimiliano Procura🇦🇹
We present a model-independent method to estimate the effects of short-distance constraints (SDCs) on the hadronic light-by-light contribution to the muon anomalous magnetic moment $a_{μ}^{HLbL}$ . The relevant loop integral is evaluated using multi-parameter families of interpolation functions, which satisfy by construction all constraints derived from general principles and smoothly connect the low-energy region with those where either two or all three independent photon virtualities become large. In agreement with other recent model-based analyses, we find that the SDCs and thus the infinite towers of heavy intermediate states that are responsible for saturating them have a rather small effect on $a_{μ}^{HLbL}$ . Taking as input the known ground-state pseudoscalar pole contributions, we obtain that the longitudinal SDCs increase $a_{μ}^{HLbL}$ by $(9.1 \pm 5.0) \times 1 0^{- 11}$ , where the isovector channel is responsible for $(2.6 \pm 1.5) \times 1 0^{- 11}$ . More precise estimates can be obtained with our method as soon as further accurate, model-independent information about important low-energy contributions from hadronic states with masses up to 1-2 GeV become available.
Comments:
19 pages, 5 figures, 1 table. Improved discussion, version accepted for publication in EPJC
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2006.00007 [pdf]
EPJC(2020)·69 citations
14
[Submitted on 29 May 2020] (cross-list from hep-ex)
First Measurement of Differential Charged Current Quasielastic-like $ν_{μ}$ -Argon Scattering Cross Sections with the MicroBooNE Detector
P. Abratenko · M. Alrashed · R. An · J. Anthony · J. Asaadi · A. Ashkenazi · S. Balasubramanian · B. Baller · C. Barnes · G. Barr · V. Basque · L. Bathe-Peters and 172 other authors
We report on the first measurement of flux-integrated single differential cross sections for charged-current (CC) muon neutrino ( $ν_{μ}$ ) scattering on argon with a muon and a proton in the final state, $^{40}$ Ar( $ν_{μ}$ , $μ$ p)X. The measurement was carried out using the Booster Neutrino Beam at Fermi National Accelerator Laboratory and the MicroBooNE liquid argon time projection chamber detector with an exposure of 4.59 $\times$ 10 $^{19}$ protons on target. Events are selected to enhance the contribution of CC quasielastic (CCQE) interactions. The data are reported in terms of a total cross section as well as single differential cross sections in final state muon and proton kinematics. We measure the integrated per-nucleus CCQE-like cross section (i.e. for interactions leading to a muon, one proton and no pions above detection threshold) of (4.93 $\pm$ 0.76stat $\pm$ 1.29sys) $\times$ 10 $^{- 38}$ cm $^{2}$ , in good agreement with theoretical calculations. The single differential cross sections are also in overall good agreement with theoretical predictions, except at very forward muon scattering angles that correspond to low momentum-transfer events.
Comments:
Accepted for publication in PRL. 8 pages, 3 figures, 1 table and online supplementary materials
Subjects:
High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2006.00108 [pdf]
PRL(2020)·87 citations
15
[Submitted on 30 May 2020] (cross-list from hep-th)
Analysis of the QCD Kondo phase using random matrices
Takuya Kanazawa🇯🇵
We propose a novel random matrix model that describes the QCD Kondo phase. The model correctly implements both the chiral symmetry of light quarks and the SU(2) spin symmetry of heavy quarks. We analytically take the large-N limit with N the matrix size and show that the model has three phases: the pure Kondo phase with no chiral condensate, the pure chirally broken phase with no Kondo condensate, and the coexistence phase. The model predicts that the pairing form of the Kondo condensate in the coexistence phase is significantly altered compared to the pure Kondo phase. For each phase, we rigorously derive the low-energy effective theory of Nambu-Goldstone modes and obtain compact closed expressions for the partition function with external sources. We also include a chiral chemical potential into the model and examine the vacuum structure.
Comments:
16 pages, 2 figures. v2: matches published version
Subjects:
High Energy Physics — Theory (hep-th); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2006.00200 [pdf]
Mod.Phys.Lett.A(2026)·8 citations
16
[Submitted on 30 May 2020] (cross-list from hep-ph)
Quark level and hadronic contributions to the electric dipole moment of charged leptons in the standard model
Yasuhiro Yamaguchi🇯🇵 · Nodoka Yamanaka🇺🇸
We evaluate the electric dipole moment of charged leptons in the standard model, where the complex phase of the Cabibbo-Kobayashi-Maskawa matrix is the only source of CP violation. We first prove that, at the quark-gluon level, it is suppressed by a factor of $m_{b}^{2} m_{c}^{2} m_{s}^{2}$ at all orders of perturbation due to the Glashow-Iliopoulos-Maiani mechanism. We then calculate the hadronic long distance contribution generated by vector mesons at one-loop level. The $∣Δ S ∣ = 1$ weak hadronic interaction is derived using the factorization, and the strong interaction is modeled by the hidden local symmetry framework. We find that the electric dipole moments of charged leptons obtained from this hadronic mechanism are much larger than the perturbative four-loop level quark-gluon process, by several orders of magnitude.
Comments:
23 pages, 9 figures, version published in Phys. Rev. D
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2006.00281 [pdf]
PRD(2021)·83 citations
17
[Submitted on 1 Jun 2020] (cross-list from hep-lat)
$d^{*} (2380)$ dibaryon from lattice QCD
Shinya Gongyo🇯🇵 · Kenji Sasaki🇯🇵 · Takaya Miyamoto🇯🇵 · Sinya Aoki🇯🇵 · Takumi Doi🇯🇵 · Tetsuo Hatsuda🇯🇵 · Yoichi Ikeda🇯🇵 · Takashi Inoue🇯🇵 · Noriyoshi Ishii🇯🇵
The $ΔΔ$ dibaryon resonance $d^{*} (2380)$ with $(J^{P}, I) = (3^{+}, 0)$ is studied theoretically on the basis of the 3-flavor lattice QCD simulation with heavy pion masses ( $m_{π} = 679, 841$ and $1018$ MeV). By using the HAL QCD method, the central $Δ$ - $Δ$ potential in the $^{7} S_{3}$ channel is obtained from the lattice data with the lattice spacing $a ≃ 0.121$ fm and the lattice size $L ≃ 3.87$ fm. The resultant potential shows a strong short-range attraction, so that a quasi-bound state corresponding to $d^{*} (2380)$ is formed with the binding energy $25$ - $40$ MeV below the $ΔΔ$ threshold for the heavy pion masses. The tensor part of the transition potential from $ΔΔ$ to $N N$ is also extracted to investigate the coupling strength between the $S$ -wave $ΔΔ$ system with $J^{P} = 3^{+}$ and the $D$ -wave $N N$ system. Although the transition potential is strong at short distances, the decay width of $d^{*} (2380)$ to $N N$ in the $D$ -wave is kinematically suppressed, which justifies our single-channel analysis at the range of the pion mass explored in this study.
Comments:
8 pages, 6 figures
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2006.00856 [pdf]
PLB(2020)·25 citations
18
[Submitted on 1 Jun 2020] (cross-list from hep-ph)
Structure and tidal deformability of a hybrid star within the framework of the field correlator method
S. Khanmohamadi🇮🇷 · H. R. Moshfegh🇮🇷 · S. Atashbar Tehrani🇮🇷
The structure of hybrid stars within the nonperturbative framework of the field correlator method, extended to zero-temperature limit as a quark model, has been studied. For the hadronic sector, we have used the lowest-order constraint variational method by employing AV18 two-body nucleon-nucleon interaction supplemented by the phenomenological Urbana-type three-body force. For an adapted value of the gluon condensate, G2 = 0:006 GeV4, which gives the critical temperature of about Tc ? 170 MeV, stable hybrid stars with a maximum mass of 2:04M? are predicted. The stability of hybrid star has been investigated for a wide range of gluon condensate value, G2, and quark-antiquark potential, V1. A hybrid equation of state fulfills the constraints on tidal deformability and hence on the radii of the stars, extracted from the binary GW170817. Moreover, tidal deformability for different chirp masses and different binary mass ratios of hybrid stars have been studied. The mass-radius relation satisfies the new constraint obtained from the neutron star interior composition explorer (NICER). A comprehensive analysis on the structure of a hybrid star and also its compactness, tidal Love number, and tidal deformability has been conducted for several parameter sets of the quark equation of state. The influence of different crustal equations of state on the mentioned quantities has been studied. Our calculations suggest the value of quark-antiquark potential, V1, to be around 0.08 GeV. The results achieved in this study are in strong concurrence with the other calculations reported on this subject.
Comments:
37 pages, 8 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2006.01019 [pdf]
PRD(2020)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE