Nuclear Theory·nucl-th

Wednesday·April 12, 2023

10 papers—3 primary·7 cross-listed

01
Instruction of my personal computing library
Tomohiro Oishi
This document is prepared to introduce and explain how to use the computing library composed by T. Oishi. The library-01 TOSPEM solves, for the spherical nucleus, (i) the Schroedinger equation for the single-nucleon states within the Woods-Saxon potential, (ii-a) the electric or magnetic transition strength, B(EJ) or B(MJ), between the arbitrary set of initial and final states of the nucleus of interest, and (ii-b) Weisskopf estimate for comparison with results in (ii-a). The library-02 RESONA is composed to solve the resonant eigenstates of spherical Schroedinger equations. The final version is expected to be published for educational and commercial purposes. Before the official publication, under the agreement with publishers, I make the current, preliminary version open for public. Two applications, GFORTRAN and GNUPLOT, are necessary for full usage. Feedbacks and comments on products will be appreciated. The source codes etc. are available in the GitHub repository [1].
nucl-thnucl-exquant-ph0 citations
02
Multi-nucleon structure and dynamics via quantum computing
Weijie Du🇺🇸 · James P. Vary🇺🇸
We propose a framework for computing the structure and dynamics for second-quantized many-nucleon Hamiltonians on quantum computers. We develop an oracle-based Hamiltonian input model that computes the many-nucleon states and nonzero Hamiltonian matrix elements of the many-nucleon system. With our Fock-state based input model, we show how to implement the sparse matrix simulation algorithms to calculate the dynamics of the second-quantized many-nucleon Hamiltonian. Based on the dynamics simulation methods, we also present the methodology for structure calculations of the many-nucleon system. In this work, we provide an explicit circuit design of our input model of the second-quantized Hamiltonian within a direct encoding scheme that maps the occupation of each available single-particle state in the many-nucleon state to the state of specific qubit in a quantum register. We analyze our method and provide the asymptotic cost in computing resources for structure and dynamics calculations of many-nucleon systems. For pedagogical purposes, we demonstrate our input model with two model problems in restricted model spaces.
nucl-thquant-phPRA·14 citations
03
Investigating Dark Matter-Admixed Neutron Stars with NITR Equation of State in Light of PSR J0952-0607
Pinku Routaray🇮🇳 · Sailesh Ranjan Mohanty🇮🇳 · H.C. Das🇮🇳 · Sayantan Ghosh🇮🇳 · P.J. Kalita🇮🇳 · V. Parmar🇮🇳 · Bharat Kumar🇮🇳
The fastest and heaviest pulsar, PSR J0952-0607, with a mass of $M = 2.35 \pm 0.17 M_{⊙}$ , has recently been discovered in the disk of the Milky Way Galaxy. In response to this discovery, a new RMF model, `NITR' has been developed. The NITR model's naturalness has been confirmed by assessing its validity for various finite nuclei and nuclear matter properties, including incompressibility, symmetry energy, and slope parameter values of 225.11, 31.69, and 43.86 MeV, respectively. These values satisfy the empirical/experimental limits currently available. The maximum mass and canonical radius of a neutron star (NS) calculated using the NITR model parameters are 2.355 $M_{⊙}$ and 13.13 km, respectively, which fall within the range of PSR J0952-0607 and the latest NICER limit. This study aims to test the consistency of the NITR model by applying it to various systems. As a result, its validity is extensively calibrated, and all the nuclear matter and NS properties of the NITR model are compared with two established models such as IOPB-I and FSUGarnet. In addition, the NITR model equation of state (EOS) is employed to obtain the properties of a dark matter admixed NS (DMANS) using two approaches (I) single-fluid and (II) two-fluid approaches. In both cases, the EOS becomes softer due to DM interactions, which reduces various macroscopic properties such as maximum mass, radius, tidal deformability, etc. The various observational data such as NICER and HESS are used to constrain the amount of DM in both cases. Moreover, we discuss the impact of dark matter (DM) on the nonradial $f$ -mode frequency of the NS in a single fluid case only and try to constrain the amount of DM using different theoretical limits available in the literature.
nucl-thJCAP(2023)·44 citations
04
Constraining beyond the Standard Model nucleon isovector charges
R. E. Smail🇦🇺 · M. Batelaan🇦🇺 · R. Horsley🇬🇧 · Y. Nakamura🇯🇵 · H. Perlt🇩🇪 · D. Pleiter🇸🇪 · P. E. L. Rakow🇬🇧 · G. Schierholz🇩🇪 · H. Stüben🇩🇪 · R. D. Young🇦🇺 · J. M. Zanotti🇦🇺
At the TeV scale, low-energy precision observations of neutron characteristics provide unique probes of novel physics. Precision studies of neutron decay observables are susceptible to beyond the Standard Model (BSM) tensor and scalar interactions, while the neutron electric dipole moment, $d_{n}$ , also has high sensitivity to new BSM CP-violating interactions. To fully utilise the potential of future experimental neutron physics programs, matrix elements of appropriate low-energy effective operators within neutron states must be precisely calculated. We present results from the QCDSF/UKQCD/CSSM collaboration for the isovector charges $g_{T}, g_{A}$ and $g_{S}$ of the nucleon, $Σ$ and $Ξ$ baryons using lattice QCD methods and the Feynman-Hellmann theorem. We use a flavour symmetry breaking method to systematically approach the physical quark mass using ensembles that span five lattice spacings and multiple volumes. We extend this existing flavour breaking expansion to also account for lattice spacing and finite volume effects in order to quantify all systematic uncertainties. Our final estimates of the nucleon isovector charges are $g_{T} = 1.010 (21)_{stat} (12)_{sys}, g_{A} = 1.253 (63)_{stat} (41)_{sys}$ and $g_{S} = 1.08 (21)_{stat} (03)_{sys}$ renormalised, where appropriate, at $μ = 2 GeV$ in the $MS$ scheme.
↳ hep-latnucl-thPRD(2023)·29 citations
05
How baryons appear in low-energy QCD: Domain-wall Skyrmion phase in strong magnetic fields
Minoru Eto🇯🇵 · Kentaro Nishimura🇯🇵 · Muneto Nitta🇯🇵
Low-energy dynamics of QCD can be described by pion degrees of freedom in terms of the chiral perturbation theory(ChPT). A chiral soliton lattice(CSL), an array of solitons, is the ground state due to the chiral anomaly in the presence of a magnetic field larger than a certain critical value at finite density. Here, we show in a model-independent and fully analytic manner (at the leading order of ChPT) that the CSL phase transits to a {\it domain-wall Skyrmion phase} when the chemical potential is larger than the critical value $μ_{c} = 16 π f_{π}^{2} /3 m_{π} \sim 1.03 GeV$ with the pion's decay constant $f_{π}$ and mass $m_{π}$ , which can be regarded as the nuclear saturation density. There spontaneously appear stable two-dimensional Skyrmions or lumps on a soliton surface, which can be viewed as three-dimensional Skyrmions carrying even baryon numbers from the bulk despite no Skyrme term. They behave as superconducting rings with persistent currents due to a charged pion condensation, and areas of the rings' interiors are quantized. This phase is in scope of future heavy-ion collider experiments.
↳ hep-phcond-mat.supr-conhep-thnucl-th22 citations
06
Fundamental Symmetries, Neutrons, and Neutrinos (FSNN): Whitepaper for the 2023 NSAC Long Range Plan
B. Acharya🇺🇸 · C. Adams🇺🇸 · A.A. Aleksandrova🇺🇸 · K. Alfonso🇺🇸 · P. An🇺🇸 · S. Baeßler🇺🇸 · A.B. Balantekin🇺🇸 · P.S. Barbeau🇺🇸 · F. Bellini🇮🇹 · V. Bellini🇮🇹 · R.S. Beminiwattha🇺🇸 · J.C. Bernauer🇺🇸 and 167 other authors
This whitepaper presents the research priorities decided on by attendees of the 2022 Town Meeting for Fundamental Symmetries, Neutrons and Neutrinos, which took place December 13-15, 2022 in Chapel Hill, NC, as part of the Nuclear Science Advisory Committee (NSAC) 2023 Long Range Planning process. A total of 275 scientists registered for the meeting. The whitepaper makes a number of explicit recommendations and justifies them in detail.
↳ nucl-exnucl-th18 citations
07
Data driven isospin analysis of timelike octet baryons electromagnetic form factors and charmonium decay into baryon-anti-baryon
Jian-Ping Dai🇨🇳 · Xu Cao🇨🇳 · Horst Lenske🇩🇪
Inspired by the recent precise data, we perform model-independently an isospin decomposition of the timelike octet baryons electromagnetic form factors. As noted in our previous work, the relative magnitude of isoscalar and isovector component is determined with the input of data on various isospin channels. Herein we further assert that {their relative phase can be constraint by the phase difference of oscillatory modulation of effective form factors} between isospin channels. The framework is extended to analyze the data of differential cross sections and applied to the form factors of nucleon and hyperons with detail and isospin non-conservation of charmonium decay into baryon-anti-baryon as well. We address that isospin analysis is meaningful when the isospin broken scale is compared to or smaller than the uncertainties of data.
↳ hep-phnucl-thPLB(2023)·20 citations
08
Is the LHCb $P_{c} (4312)^{+}$ plausible in the GlueX $γ p \to J / ψ p$ total cross sections ?
Igor Strakovsky (GWU)🇺🇸 · William J. Briscoe (GWU)🇺🇸 · Eugene Chudakov (JLab)🇺🇸 · Ilya Larin (UMASS Amherst)🇺🇸 · Lubomir Pentchev (JLab)🇺🇸 · Axel Schmidt (GWU)🇺🇸 · Ronald L. Workman (GWU)🇺🇸
New high-statistics total cross section data for $γ p \to J / ψ p$ from the GLUonic EXcitation (GlueX) experiment are fitted in a search for the exotic $P_{c} (4312)^{+}$ state observed by the Large Hadron Collider beauty (LHCb) collaboration. The integrated luminosity of this GlueX experiment was about $320 p b^{- 1}$ . The fits show that destructive interference involving an $S$ -wave resonance and associated non-resonance background produces a sharp dip structure about $75 MeV$ below the LHCb mass, in the same location as a similar structure is seen in the data. Limitations of the employed model and the need for improved statistics are discussed.
↳ hep-phhep-exnucl-exnucl-thPRC(2023)·23 citations
09
Quasicrystals in QCD
Zebin Qiu🇯🇵 · Muneto Nitta🇯🇵
We study the ground state of the low energy dense QCD with the assumption of chiral condensates of quarks. Under an external magnetic field, mesons could form soliton lattices via the chiral anomaly. For such scenarios, we present a unified description of pions and $η$ meson with a $U (2)$ field in the framework of the chiral perturbation theory. Our result shows the ground state is a mixture of the magnetized domain walls formed by neutral pion $π^{0}$ and $η$ meson when they coexist. The winding number of the ground state would alter according to the strength of the magnetic field. When the magnetic field is strong or the chemical potential is large, the proportion of the mixture is determined by the decay constants and the contributions to the anomalous action of $π^{0}$ and $η$ meson. The resulting configuration is either a mixed soliton lattice or a quasicrystal which could be dubbed a ``chiral soliton quasicrystal''.
↳ hep-phhep-thnucl-thJHEP(2023)·22 citations
10
Thermodynamics of a rotating hadron resonance gas with van der Waals interaction
Kshitish Kumar Pradhan🇮🇳 · Bhagyarathi Sahoo🇮🇳 · Dushmanta Sahu🇮🇳 · Raghunath Sahoo🇮🇳
Studying the thermodynamics of the systems produced in ultra-relativistic heavy-ion collisions is crucial in understanding the QCD phase diagram. Recently, a new avenue has opened regarding the implications of large initial angular momentum and subsequent vorticity in the medium evolution in high-energy collisions. This adds a new type of chemical potential into the partonic and hadronic systems, called the rotational chemical potential. We study the thermodynamics of an interacting hadronic matter under rotation, formed in an ultra-relativistic collision. We introduce attractive and repulsive interactions through the van der Waals equation of state. Thermodynamic properties like the pressure ( $P$ ), energy density ( $ε$ ), entropy density ( $s$ ), trace anomaly ( $(ε - 3 P) / T^{4}$ ), specific heat ( $c_{v}$ ) and squared speed of sound ( $c_{s}^{2}$ ) are studied as functions of temperature ( $T$ ) for zero and finite rotation chemical potential. The conserved charge fluctuations, which can be quantified by their respective susceptibilities, are also studied. The rotational (spin) density corresponding to the rotational chemical potential is explored. In addition, we explore the possible liquid-gas phase transition in the hadron gas with van der Waals interaction in the $T$ -- $ω$ phase space.
↳ hep-phhep-exnucl-exnucl-thEPJC(2024)·32 citations

Affiliations

first authorsco-authorsvia INSPIRE