Nuclear Theory·nucl-th

Wednesday·September 23, 2020

10 papers—5 primary·5 cross-listed

01
[Submitted on 22 Sept 2020]
Ab-initio no-core shell model study of $^{10 - 14}$ B isotopes with realistic NN interactions
Priyanka Choudhary · Praveen C. Srivastava · Petr Navrátil
We report a comprehensive study of $^{10 - 14}$ B isotopes within the \textit{ab-initio} no-core shell model (NCSM) using realistic nucleon-nucleon (\textit{NN}) interactions. In particular, we have applied the inside non-local outside Yukawa (INOY) interaction to study energy spectra, electromagnetic properties and point-proton radii of the boron isotopes. The NCSM results with the charge-dependent Bonn 2000 (CDB2K), the chiral next-to-next-to-next-to-leading order (N $^{3}$ LO) and optimized next-to-next-to-leading order (N $^{2}$ LO $_{o pt}$ ) interactions are also reported. We have reached basis sizes up to $N_{\mbox ma x}$ = 10 for $^{10}$ B, $N_{\mbox ma x}$ = 8 for $^{11, 12, 13}$ B and $N_{\mbox ma x}$ = 6 for $^{14}$ B with m-scheme dimensions up to 1.7 billion. We also compare the NCSM calculations with the phenomenological YSOX interaction using the shell model to test the predictive power of the \textit{ab-initio} nuclear theory. Overall, our NCSM results are consistent with the available experimental data. The experimental ground state spin $3^{+}$ of $^{10}$ B has been reproduced using the INOY \textit{NN} interaction. Typically, the 3\textit{N} interaction is required to correctly reproduce the aforementioned state.
Comments:
16 pages, 9 figures, accepted in Phys. Rev. C
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2009.10257 [pdf]
PRC(2020)·33 citations
02
[Submitted on 22 Sept 2020]
Pairing vibrations in the interacting boson model based on density functional theory
K. Nomura · D. Vretenar · Z. P. Li · J. Xiang
We propose a method to incorporate the coupling between shape and pairing collective degrees of freedom in the framework of the interacting boson model (IBM), based on the nuclear density functional theory. To account for pairing vibrations, a boson-number non-conserving IBM Hamiltonian is introduced. The Hamiltonian is constructed by using solutions of self-consistent mean-field calculations based on a universal energy density functional and pairing force, with constraints on the axially-symmetric quadrupole and pairing intrinsic deformations. By mapping the resulting quadrupole-pairing potential energy surface onto the expectation value of the bosonic Hamiltonian in the boson condensate state, the strength parameters of the boson Hamiltonian are determined. An illustrative calculation is performed for $^{122}$ Xe, and the method is further explored in a more systematic study of rare-earth $N = 92$ isotones. The inclusion of the dynamical pairing degree of freedom significantly lowers the energies of bands based on excited $0^{+}$ states. The results are in quantitative agreement with spectroscopic data, and are consistent with those obtained using the collective Hamiltonian approach.
Comments:
14 pages, 13 figures, 6 tables
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2009.10374 [pdf]
PRC(2020)·15 citations
03
[Submitted on 19 Sept 2020]
Event rates for the scattering of weakly interacting massive particles from $^{23}$ Na and $^{40}$ Ar
R. Sahu · V.K.B. Kota
Detection rates for the elastic and inelastic scattering of weakly interacting massive particles (WIMP) off $^{23}$ Na are calculated within the framework of Deformed Shell Model (DSM) based on Hartree-Fock states. First the spectroscopic properties like energy spectra and magnetic moments are calculated and compared with experiment. Following the good agreement for these, DSM wave functions are used for obtaining elastic and inelastic spin structure functions, nuclear structure coefficients etc. for the WIMP- $^{23}$ Na scattering. Then, the event rates are also calculated with a given set of supersymmetric parameters. In the same manner, using DSM wavefunctions, nuclear structure coefficients and event rates for elastic scattering of WIMP from $^{40}$ Ar are also obtained. These results for event rates and also for annual modulation will be useful for the upcoming and future WIMP detection experiments involving detectors with $^{23}$ Na and $^{40}$ Ar.
Comments:
arXiv admin note: substantial text overlap with arXiv:2004.04055, arXiv:1706.08112
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2009.10522 [pdf]
Particles(2021)·5 citations
04
[Submitted on 22 Sept 2020]
Quarkonium in Quark-Gluon Plasma: Open Quantum System Approaches Re-examined
Yukinao Akamatsu🇯🇵
Dissociation of quarkonium in quark-gluon plasma (QGP) is a long standing topic in relativistic heavy-ion collisions because it has been believed to signal one of the fundamental natures of the QGP -- Debye screening due to the liberation of color degrees of freedom. Among recent new theoretical developments is the application of open quantum system framework to quarkonium in the QGP. Open system approach enables us to describe how dynamical as well as static properties of QGP influences the time evolution of quarkonium in a coherent way. Currently, there are several master equations for quarkonium corresponding to various scale assumptions, each derived in different theoretical frameworks. In this review, all of the existing master equations are systematically rederived as Lindblad equations in a unified framework. Also, as one of the most relevant descriptions in relativistic heavy-ion collisions, quantum Brownian motion of heavy quark pair in the QGP is studied in detail. The quantum Brownian motion is parametrized by a few fundamental quantities of QGP such as real and imaginary parts of heavy quark potential (complex potential), heavy quark momentum diffusion constant, and thermal dipole self-energy constant, which constitute in-medium self-energy of a static quarkonium. This indicates that the yields of quarkonia such as $J / ψ$ and $Υ$ in the relativistic heavy-ion collisions have the potential to determine these fundamental quantities.
Comments:
v2: 77 pages, 1 figure. Final draft of a review article accepted by Progress in Particle and Nuclear Physics
Subjects:
Nuclear Theory (nucl-th); Statistical Mechanics (cond-mat.stat-mech); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2009.10559 [pdf]
PPNP(2022)·123 citations
05
[Submitted on 22 Sept 2020]
BigApple force and its implications to finite nuclei and astrophysical objects
H. C. Das · Ankit Kumar · Bharat Kumar · S. K. Biswal · S. K. Patra
The secondary component of the GW190814 event left us with a question, "whether it is a supermassive neutron star or lightest black-hole?". Recently, Fattoyev et al. have obtained an energy density functional (EDF) named as BigApple, which reproduces the mass of the neutron star is 2.60 $M_{⊙}$ which is well consistent with GW190814 data. This study explores the properties of finite nuclei, nuclear matter, and neutron stars by using the BigApple EDF along with four well-known relativistic mean-field forces, namely NL3, G3, IOPB-I, and FSUGarnet. The finite nuclei properties like binding energy per particle, skin thickness, charge radius, single-particle energy, and two-neutron separation energy are well predicted by the BigApple for a series of nuclei. The calculated nuclear matter quantities such as incompressibility, symmetry energy, and slope parameters at saturation density are consistent with the empirical or experimental values where ever available. The predicted canonical tidal deformability by the BigApple parameter set is well-matched with the GW190814 data. Also, the dimensionless moment of inertia lies in the range given by the analysis of PSR J0737-3039A.
Comments:
26 pages, 15 figures, 4 tables. Published in IJMPE
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
arXiv:
2009.10690 [pdf]
IJMPE(2021)·25 citations
06
[Submitted on 21 Sept 2020] (cross-list from hep-ph)
Analysis of Light Neutrino Exchange and Short-Range Mechanisms in $0 ν β β$ Decay
Frank F. Deppisch🇬🇧 · Lukas Graf🇩🇪 · Francesco Iachello🇺🇸 · Jenni Kotila🇫🇮
Neutrinoless double beta decay ( $0 ν β β$ ) is a crucial test for lepton number violation. Observation of this process would have fundamental implications for neutrino physics, theories beyond the Standard Model and cosmology. Focussing on so called short-range operators of $0 ν β β$ and their potential interplay with the standard light Majorana neutrino exchange, we present the first complete calculation of the relevant nuclear matrix elements, performed within the interacting boson model (IBM-2). Furthermore, we calculate the relevant phase space factors using exact Dirac electron wavefunctions, taking into account the finite nuclear size and screening by the electron cloud. The obtained numerical results are presented together with up-to-date limits on the standard mass mechanism and effective $0 ν β β$ short-range operators in the IBM-2 framework. Finally, we interpret the limits in the particle physics scenarios incorporating heavy sterile neutrinos, Left-Right symmetry and R-parity violating supersymmetry.
Comments:
54 pages, 10 figures, 14 tables, including appendix, v2 matches published version
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2009.10119 [pdf]
PRD(2020)·132 citations
07
[Submitted on 22 Sept 2020] (cross-list from hep-ph)
Fully-heavy tetraquarks in strongly interacting medium
Jiaxing Zhao🇨🇳 · Shuzhe Shi🇨🇦 · Pengfei Zhuang🇨🇳
We study the properties of fully-heavy tetraquarks at finite temperature and their production in high-energy nuclear collisions. We obtain the masses and wave functions of the exotic hadron states $cc c ˉ c ˉ$ and $bb b ˉ b ˉ$ by solving the four-body Schrödinger equation in vacuum and strongly interacting matter. In vacuum, the tetraquarks are above the corresponding meson-meson mass threshold, and the newly observed exotic state $X (6900)$ might be a $cc c ˉ c ˉ$ state with quantum number $J^{P C} = 0^{++}$ or $1^{+-}$ . In hot medium, the temperature dependence of the tetraquark masses and the dissociation temperatures are calculated. Taking the wave function at finite temperature, we construct the Wigner function for the tetraquark states and calculate, with coalescence mechanism, the production yield and transverse momentum distribution of $cc c ˉ c ˉ$ in heavy-ion collisions at LHC energy. In comparison with nucleon-nucleon collisions, the yield per binary collision is significantly enhanced.
Comments:
13 pages, 5 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2009.10319 [pdf]
PRD(2020)·90 citations
08
[Submitted on 22 Sept 2020] (cross-list from hep-ph)
Medium effects on the electrical and Hall conductivities of a hot and magnetized pion gas
Pallavi Kalikotay🇮🇳 · Snigdha Ghosh🇮🇳 · Nilanjan Chaudhuri🇮🇳 · Pradip Roy🇮🇳 · Sourav Sarkar🇮🇳
The electrical and Hall conductivities in a uniform magnetic field are evaluated for an interacting pion gas using the kinetic theory approach within the ambit of relaxation time approximation (RTA). The in-medium cross sections vis-a-vis the relaxation time for $π π$ scattering are obtained using a one-loop modified thermal propagator for the exchanged $ρ$ and $σ$ mesons using thermal field theoretic techniques. For higher values of the magnetic field, a monotonic increase of the electrical conductivity with the temperature is observed. However, for a given temperature the conductivity is found to decrease steadily with magnetic field. The Hall conductivity, at lower values of the magnetic field, is found to decrease with temperature more rapidly than the electrical conductivity, whereas at higher values of the magnetic field, a linear increase is seen. Use of the in-medium scattering cross-section is found to produce a significant effect on the temperature dependence of both electrical and Hall conductivities compared to the case where vacuum cross-section is used.
Comments:
Version published in Physical Review D
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2009.10493 [pdf]
PRD(2020)·24 citations
09
[Submitted on 22 Sept 2020] (cross-list from nucl-ex)
PRad-II: A New Upgraded High Precision Measurement of the Proton Charge Radius
A. Gasparian · H. Gao · D. Dutta · N. Liyanage · E. Pasyuk · D. W. Higinbotham · C. Peng · K. Gnanvo · W. Xiong · X. Bai · the PRad collaboration
The PRad experiment has credibly demonstrated the advantages of the calorimetric method in e-p scattering experiments to measure the proton root-mean-square (RMS) charge radius with high accuracy. The PRad result, within its experimental uncertainties, is in agreement with the small radius measured in muonic hydrogen spectroscopy experiments and it was a critical input in the recent revision of the CODATA recommendation for the proton charge radius. Consequently, the PRad result is in direct conflict with all modern electron scattering experiments. Most importantly, it is 5.8% smaller than the value from the most precise electron scattering experiment to date, and this difference is about three standard deviations given the precision of the PRad experiment. As the first experiment of its kind, PRad did not reach the highest precision allowed by the calorimetric technique. Here we propose a new (and) upgraded experiment -- PRad-II, which will reduce the overall experimental uncertainties by a factor of 3.8 compared to PRad and address this as yet unsettled controversy in subatomic physics. In addition, PRad-II will be the first lepton scattering experiment to reach the Q^2 range of 10^{-5} GeV^2 allowing a more accurate and robust extraction of the proton charge radius. The muonic hydrogen result with its unprecedented precision (~0.05%) determines the CODATA value of the proton charge radius, hence, it is critical to evaluate possible systematic uncertainties of those experiments, such as the laser frequency calibration that was raised in recent review articles. The PRad-II experiment with its projected total uncertainty of 0.43% could demonstrate whether there is any systematic difference between $e - p$ scattering and muonic hydrogen results. PRad-II will establish a new precision frontier in electron scattering and open doors for future physics opportunities.
Comments:
Proposal approved by JLab PAC 48
Subjects:
Nuclear Experiment (nucl-ex); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2009.10510 [pdf]
44 citations
10
[Submitted on 22 Sept 2020] (cross-list from hep-ph)
Global analysis of the Sivers functions at NLO+NNLL in QCD
Miguel G. Echevarria🇪🇸 · Zhong-Bo Kang🇺🇸 · John Terry🇺🇸
We perform global fit to the quark Sivers function within the transverse momentum dependent (TMD) factorization formalism in QCD. We simultaneously fit Sivers asymmetry data from Semi-Inclusive Deep Inelastic Scattering (SIDIS) at COMPASS, HERMES, and JLab, from Drell-Yan lepton pair production at COMPASS, and from $W / Z$ boson at RHIC. This extraction is performed at next-to-leading order (NLO) and next-to-next-to leading logarithmic (NNLL) accuracy. We find excellent agreement between our extracted asymmetry and the experimental data for SIDIS and Drell-Yan lepton pair production, while tension arises when trying to describe the spin asymmetries of $W / Z$ bosons at RHIC. We carefully assess the situation, and we study in details the impact of the RHIC data and their implications through different ways of performing the fit. In addition, we find that the quality of the description of $W / Z$ vector boson asymmetry data could be strongly sensitive to the DGLAP evolution of Qiu-Sterman function, besides the usual TMD evolution. We present discussion on this and the implications for measurements of the transverse-spin asymmetries at the future Electron Ion Collider.
Comments:
48 pages, 21 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2009.10710 [pdf]
JHEP(2021)·95 citations

Affiliations

first authorsco-authorsvia INSPIRE