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Nuclear Theory·nucl-th

Wednesday·December 5, 2018

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 01

    Shape evolution of Zr nuclei and roles of tensor force

    S. Miyahara · H. Nakada

    Shape evolution of Zr nuclei are investigated by the axial Hartree-Fock (HF) calculations using the semi-realistic interaction M3Y-P6, with focusing on roles of the tensor force. Deformation at is reproduced, which has not been easy to describe within the self-consistent mean-field calculations. The spherical shape is obtained in , and the prolate deformation is predicted in , while the shape switches to oblate at . The sphericity returns at and . The deformation in resolves the discrepancy in the previous magic-number prediction based on the spherical mean-field calculations [Prog. Theor. Exp. Phys. \textbf{2014}, 033D02]. It is found that the deformation at takes place owing to the tensor force with a good balance. The tensor-force effects significantly depend on the configurations, and are pointed out to be conspicuous when the unique-parity orbit (e.g. ) is present near the Fermi energy, delaying deformation. These effects are crucial for the magicity at and for the predicted shape change at and .

    nucl-thPRC(2018)·24 citations
  2. 02

    Heavy quarkonium dissociation in the finite space of heavy-ion collisions

    Jihong Guo · Wu-Sheng Dai · Mi Xie · Yunpeng Liu

    The dissociation of heavy quarkonia in the constrained space is calculated at leading order compared with that in infinitely large medium. To deal with the summation of the discrete spectrum, a modified Euler-Maclaurin formula is developed as our numerical algorithm. We find that with the constraint in space, the dissociation of quarkonia at early time becomes negligible.

    nucl-thPRC(2019)·3 citations
  3. 03

    Ab initio folding potentials for proton-nucleus scattering with NCSM nonlocal one-body densities

    Ch. Elster · M. Burrows · S.P. Weppner · K. Launey · P. Maris · G. Popa

    Based on the spectator expansion of the multiple scattering series we employ a nonlocal translationally invariant nuclear density derived from a chiral next-to-next-to-leading order (NNLO) and the very same interaction for consistent full-folding calculations of the effective (optical) potential for nucleon-nucleus scattering for light nuclei.

    nucl-thSpringer Proc.Phys.(2020)·0 citations
  4. 04

    Dipole-dipole interactions between neutrons

    Renato Higa🇧🇷 · James F. Babb🇺🇸 · Mahir S. Hussein🇧🇷

    In this work we present results of the dipole-dipole interactions between two neutrons, a neutron and a conducting wall, and a neutron between two walls. As input, we use dynamical electromagnetic dipole polarizabilities fitted to chiral EFT results up to the pion production threshold and at the onset of the Delta resonance. Our work can be relevant to the physics of confined ultracold neutrons inside bottles.

    nucl-thhep-phnucl-exSpringer Proc.Phys.(2020)·1 citation
  5. 05

    Muon-electron lepton-flavor violating transitions: shell-model calculations of transitions in 27Al

    J.Kostensalo🇫🇮 · J. Suhonen🇫🇮 · O. Civitarese🇦🇷

    In this paper we present the results of large-scale shell-model calculations of muon-to-electron lepton-flavor violating transitions for the case of the target nucleus 27Al. We extend the previous shell-model calculations, done in the sd model space, by including also the p orbitals in order to see whether the negative-parity states produce any significant effect in the conversion rate. The analysis of the results shows the dominance of coherent transitions mediated by isovector operators and going by the ground state of the target, with practically null influence of excited positive- or negative-parity states.

    nucl-thPRC(2018)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE