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Nuclear Theory·nucl-th

Thursday·July 26, 2018

11 papers—5 primary·6 cross-listed

All11Primary5Cross-lists6
  1. 01

    Symmetry Restoration in Mixed-Spin Paired Heavy Nuclei

    Ermal Rrapaj🇨🇦 · A. O. Macchiavelli🇺🇸 · Alexandros Gezerlis🇨🇦

    The nature of the nuclear pairing condensates in heavy nuclei, specifically neutron-proton (spin-triplet), versus identical-particle (spin-singlet) pairing has been an active area of research for quite some time. In this work, we probe three candidates that should display spin-triplet, spin-singlet, and mixed-spin pairing. Using theoretical approaches such as the gradient method and symmetry restoration techniques, we find the ground state of these nuclei in Hartree-Fock-Bogoliubov theory and compute ground-state to ground-state pair-transfer amplitudes to neighbouring isotopes while simultaneously projecting to specific particle number and nuclear spin values. We identify specific reactions for future experimental research that could shed light on spin-triplet and mixed-spin pairing.

    nucl-thcond-mat.supr-conPRC(2019)·10 citations
  2. 02

    Photon radiation from heavy-ion collisions in the GeV regime

    Charles Gale🇨🇦 · Sangyong Jeon🇨🇦 · Scott McDonald🇨🇦 · Jean-François Paquet🇺🇸 · Chun Shen🇺🇸

    We present calculations of prompt and thermal photon production in Au-Au collisions at ~GeV. We discuss features of the spacetime profile of the plasma relevant for electromagnetic emission. We highlight how the suppression of prompt photon production at low can provide a window to measure thermal photons in low collision energies.

    nucl-thNPA(2019)·11 citations
  3. 03

    Effects of nonlocality of nuclear potentials on direct capture reactions

    Yuan Tian · D.Y. Pang · Zhongyu Ma

    Calculations of the direct radiative capture reactions are made for the CaCa, LiLi and CN reactions with the Perey-Buck type nonlocal potentials using a potential model. Our results reproduce the experimental data reasonably well. From comparisons with results obtained by using local potentials, it is found that the cross sections of direct capture reactions may change by around 25\% due to the nonlcality of nuclear potentials.

    nucl-thPRC(2018)·13 citations
  4. 04

    Zero-sound in nuclear matter with the asymmetry parameter

    V. A. Sadovnikova (Petersburg Nuclear Physics Institute)🇷🇺

    Results for the frequencies of zero-sound excitations in the isospin asymmetric nuclear matter are presented for the different parameters of asymmetry -1\leq\beta\leq 1. The dispersion equations are constructed within the random phase approximation. We use the effective Landau-Migdal quasiparticle interaction with the special isospin dependence of the phase volume in the normalization factor C_0. In the paper we present zero-sound branches of the dispersion equation solutions in the symmetric, asymmetric and neutron matter. The branches correspond to the different channels of decay of the zero-sound excitation in the nuclear matter or nuclei. In the asymmetric nuclear matter we obtain three branches of solutions on the physical and unphysical sheets of the complex frequency plane, \omega_{s\,\tau}(k,\beta), \tau=p,n,np. We demonstrate the change of branches with \beta and conversion of the three branches into two branches in symmetric nuclear matter (\beta=0) and into one branch in the neutron matter (\beta=1).

    nucl-th1 citation
  5. 05

    Correlating Schiff moments in the light actinides with octupole moments

    Jacek Dobaczewski🇬🇧 · Jonathan Engel🇺🇸 · Markus Kortelainen🇫🇮 · Pierre Becker🇬🇧

    We show that the measured intrinsic octupole moments of Rn, Ra, and Ra constrain the intrinsic Schiff moments of RaRn, Rn, Fr, Ra, and Pa. The result is a dramatically reduced uncertainty in intrinsic Schiff moments. Direct measurements of octupole moments in odd nuclei will reduce the uncertainty even more. The only significant source of nuclear-physics error in the laboratory Schiff moments will then be the intrinsic matrix elements of the time-reversal non-invariant interaction produced by CP-violating fundamental physics. Those matrix elements are also correlated with octupole moments, but with a larger systematic uncertainty.

    nucl-thPRL(2018)·81 citations

Affiliations

first authorsco-authorsvia INSPIRE