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Nuclear Theory·nucl-th

Friday·October 29, 2021

20 papers—6 primary·14 cross-listed

All20Primary6Cross-lists14
  1. 01

    Illustrations of loosely-bound and resonant states in atomic nuclei

    A. C. Dassie · F. Gerdau · F. J. Gonzalez · M. Moyano · R. M. Id Betan

    Using the one-dimensional potential well with realistic parameters for atomic nuclei, we illustrate the movement of the poles of the S-matrix, and the transmission coefficient when the well supports an anti-bound state. We calculate the phase shift of the atomic nuclei 5He using the three-dimensional potential well, and compare it with the experimental one. The paper gives a glance of some of the properties found in realistic loosely and resonant nuclear systems, using equations at the level of undergraduate students.

    nucl-thphysics.ed-phAm.J.Phys.(2022)·3 citations
  2. 02

    Flow decorrelation in heavy-ion collisions at =27 and 200 GeV with 3D event-by-event viscous hydrodynamics

    Jakub Cimerman🇨🇿 · Iurii Karpenko🇨🇿 · Boris Tomasik🇨🇿 · Barbara Antonina Trzeciak🇨🇿

    We present the first calculation of longitudinal decorrelation of anisotropic flow at RHIC Beam Energy Scan (BES) energies using event-by-event viscous hydrodynamic model (vHLLE), with two different initial states (GLISSANDO2 and UrQMD) and hadronic cascade. We investigate the origin of the observed decorrelation by checking separately flow angle and flow magnitude decorrelation and by calculating decorrelation in the initial state eccentricity.

    nucl-thnucl-exSciPost Phys.Proc.(2022)·0 citations
  3. 03

    Large and massive neutron stars: Implications for the sound speed in dense QCD

    Christian Drischler🇺🇸 · Sophia Han🇺🇸 · Sanjay Reddy🇺🇸

    The NASA telescope NICER has recently measured x-ray emissions from the heaviest of the precisely known two-solar mass neutron stars, PSR J0740+6620. Analysis of the data [Miller et al., Astrophys. J. Lett. 918, L28 (2021); Riley et al., Astrophys. J. Lett. 918, L27 (2021)] suggests that PSR J0740+6620 has a radius in the range of km at the credibility level. In this article, we study the implications of this analysis for the sound speed in the high-density inner cores by using recent chiral effective field theory (EFT) calculations of the equation of state at next-to-next-to-next-to-leading order to describe outer regions of the star at modest density. We find that the lower bound on the maximum speed of sound in the inner core, , increases rapidly with the radius of massive neutron stars. If EFT remains an efficient expansion for nuclear interactions up to about twice the nuclear saturation density, km requires and at the and credibility level, respectively.

    nucl-thastro-ph.HEPRC(2022)·55 citations
  4. 04

    Systematic study on proton radioactivity of spherical proton emitters within two--potential approach

    Jiu-Long Chen · Xiao-Hua Li · Xi-Jun Wu · Peng-Cheng Chu · Biao He

    In the present work we systematically study the half--lives of proton radioactivity for spherical proton emitters with based on two--potential approach. While the nuclear potential of the emitted proton--daughter nucleus is adopted by a parameterized cosh type, the parameters of the depth and diffuseness for nuclear potential are determined by fitting experimental data of 32 spherical proton emitters. In order to reduce the deviations between experimental half-lives and calculated ones, we propose a simple analytic expression for formation probability of proton radioactivity with the same orbital angular momentum . The results indicate that the formation probability can be simply described by a formula of . Moreover, the linear relationship between the formation probability and the fragmentation potential also exists. The calculated half-lives can well reproduce the experimental data.

    nucl-thEPJA(2021)·6 citations
  6. 06

    Nucleon-nucleon interaction in chiral EFT with a finite cutoff: explicit perturbative renormalization at next-to-leading order

    A. M. Gasparyan🇩🇪 · E. Epelbaum🇩🇪

    We present a study of two-nucleon scattering in chiral effective field theory with a finite cutoff to next-to-leading order in the chiral expansion. In the proposed scheme, the contributions of the lowest-order interaction to the scattering amplitude are summed up to an arbitrary order, while the corrections beyond leading order are iterated only once. We consider a general form of the regulator for the leading-order potential including local and non-local structures. The main objective of the paper is to address formal aspects of renormalizability within the considered scheme. In particular, we provide a rigorous proof, valid to all orders in the iterations of the leading-order potential, that power-counting breaking terms originating from the integration regions with momenta of the order of the cutoff can be absorbed into the renormalization of the low energy constants of the leading contact interactions. We also demonstrate that the cutoff dependence of the scattering amplitude can be reduced by perturbatively subtracting the regulator artifacts at next-to-leading order. The obtained numerical results for phase shifts in - and higher partial waves confirm the applicability of our scheme for nucleon-nucleon scattering.

    nucl-thPRC(2022)·31 citations

Affiliations

first authorsco-authorsvia INSPIRE