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Nuclear Theory·nucl-th

Friday·May 10, 2024

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 01

    Chiral Magnetic Effect in Heavy Ion Collisions: The Present and Future

    Dmitri E. Kharzeev🇺🇸 · Jinfeng Liao🇺🇸 · Prithwish Tribedy🇺🇸

    The chiral magnetic effect (CME) is a collective quantum phenomenon that arises from the interplay between gauge field topology and fermion chiral anomaly, encompassing a wide range of physical systems from semimetals to quark-gluon plasma. This review, with a focus on CME and related effects in heavy ion collisions, aims to provide an introductory discussion on its conceptual foundation and measurement methodology, a timely update on the present status in terms of experimental findings and theoretical progress, as well as an outlook into the open problems and future developments.

    nucl-thhep-lathep-phhep-th+1IJMPE(2024)·59 citations
  2. 02

    Electromagnetic observables of open-shell nuclei from coupled-cluster theory

    Francesca Bonaiti · Sonia Bacca · Gaute Hagen · Gustav R. Jansen

    We develop a new method to describe electromagnetic observables of open-shell nuclei with two nucleons outside a closed shell. This approach combines the equation-of-motion coupled-cluster method for such systems and the Lorentz integral transform technique, expanding the applicability of coupled-cluster theory for these properties beyond closed-shell nuclei. To validate this new approach, we compute the non-energy-weighted dipole sum rule and the dipole polarizability of O in both the closed-shell and the new equation-of-motion coupled-cluster frameworks, finding agreement within error bars. We then analyze the evolution of the dipole polarizability along the oxygen and calcium isotopic chains. Our predictions agree well with available experimental data and other available theoretical calculations for the closed-shell O and the open-shell O. In the calcium isotopes, we observe that our dipole polarizability predictions for open-shell nuclei are lower than those of closed-shell nuclei. Our predictions for O and Ca will motivate future experimental studies at the dripline.

    nucl-thnucl-exPRC(2024)·23 citations
  3. 03

    Quasielastic Lepton-Nucleus Scattering and the Correlated Fermi Gas Model

    Bhubanjyoti Bhattacharya🇺🇸 · Sam Carey🇺🇸 · Erez O. Cohen🇮🇱 · Gil Paz🇺🇸

    The neutrino research program in the coming decades will require improved precision. A major source of uncertainty is the interaction of neutrinos with nuclei that serve as targets for such experiments. Broadly speaking, this interaction often depends, e.g., for charge-current quasi-elastic scattering, on the combination of ``nucleon physics", expressed by form factors, and ``nuclear physics", expressed by a nuclear model. It is important to get a good handle on both. We present a fully analytic implementation of the Correlated Fermi Gas Model for electron-nucleus and charge-current quasi-elastic neutrino-nucleus scattering. The implementation is used to compare separately form factors and nuclear model effects for both electron-carbon and neutrino-carbon scattering data.

    ↳ hep-phhep-exnucl-exnucl-thPRD(2025)·2 citations
  4. 04

    Exotic Stable Branches with Efficient TOV Sequences

    Reed Essick

    Modern inference schemes for the neutron star equation of state (EoS) require large numbers of stellar models constructed with different EoS, and these stellar models must capture all the behavior of stable stars. I introduce termination conditions for sequences of stellar models for cold, non-rotating neutron stars that can identify all stable stellar configurations up to arbitrarily large central pressures along with an efficient algorithm to build accurate interpolators for macroscopic properties. I explore the behavior of stars with both high- and low-central pressures. Interestingly, I find that EoS with monotonically increasing sound-speed can produce multiple stable branches (twin stars) and that large phase transitions at high densities can produce stable branches at nearly any mass scale, including sub-solar masses, while still supporting stars with . I conclude with some speculation about the astrophysical implications of this behavior.

    ↳ astro-ph.HEgr-qcnucl-thApJL(2024)·7 citations
  5. 05

    Robustness of the Hedgehog Skyrmion

    N.S.Manton🇬🇧

    We investigate the radial profile function of the hedgehog Skyrmion with unit baryon number in generic EFTs (effective field theories) of pions. The analysis assumes chiral symmetry and ignores the pion mass term. The Skyrmion is always smooth, because it has no point source at the origin, and terms in the EFT with higher numbers of pion derivatives do not result in uncontrolled large corrections or singularities there. The profile varies in quite a limited way as the terms in the EFT change, and a universal profile function is proposed.

    ↳ hep-thnucl-thJHEP(2024)·2 citations
  6. 06

    In-medium changes of nucleon cross sections tested in neutrino-induced reactions

    B. Bogart🇺🇸 · K. Gallmeister🇩🇪 · U. Mosel🇩🇪

    Historically studied in the context of heavy-ion collisions, the extent to which free nucleon-nucleon cross sections are modified in-medium remains undetermined by these data sets. Therefore, we investigate the impact of NN in-medium modifications on neutrino-nucleus cross section predictions using the GiBUU transport model. We find that including an in-medium lowering of the NN cross section and density dependence on excitation improves agreement with MicroBooNE neutrino-argon scattering data. This is observed for both proton and neutral pion spectra in charged-current muon neutrino and neutral-current single pion production datasets. The impact of collision broadening of the resonance is also investigated. The absence of broadening is slightly favored, but the larger uncertainties on the pion production data prevent definitive conclusions.

    ↳ hep-exhep-phnucl-exnucl-thPRC(2024)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE