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Nuclear Theory·nucl-th

Friday·September 9, 2016

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    [Submitted on 7 Sept 2016]

    Nuclear Physics and Astrophysics of Neutrino Oscillations

    A.B. Balantekin (Wisconsin U., Madison)🇺🇸

    For a long time very little experimental information was available about neutrino properties, even though a minute neutrino mass has intriguing cosmological and astrophysical implications. This situation has changed in recent decades: intense experimental activity to measure many neutrino properties took place. Some of these developments and their implications for astrophysics and cosmology are briefly reviewed with a particular emphasis on neutrino magnetic moments and collective neutrino oscillations

    Comments:
    NIC 2016 Conference Proceedings
    Subjects:
    Nuclear Theory (nucl-th); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1609.02207 [pdf]
    JPS Conf.Proc.(2017)·1 citation
  2. 02

    [Submitted on 8 Sept 2016]

    B(E2) anomaly in isomers of Sn isotopes and neutron single-particle energies beyond N=82

    Bhoomika Maheshwari · Ashok Kumar Jain

    Isomeric studies in neutron-rich nuclei present a powerful tool to explore the structure at the nuclear extremes. We recently used the shell model calculations with Renormalized Charge Depen- dent Bonn (RCDB) effective interaction to calculate the properties of the seniority isomers in Sn in an attempt to resolve the anomalous B(E2) behavior of the isomer in Sn [Phys. Rev. C 91, 024321 (2015)]. We further explore these isomers by using the generalized seniority scheme for multi-j orbitals recently presented by us [Phys. Lett. B 753, 122 (2016)]; the B(E2) values so calculated reproduce the experimental data quite well, including the anomaly at Sn confirming the generalized seniority nature of the isomers. We then use the generalized seniority guided Large Scale Shell Model (LSSM) calculations, along with the latest single particle energies from Jones et al : [Nature (London) 465, 454 (2010)] and Allmond et al : [Phys. Rev. Lett. 112, 172701 (2014)] to estimate more accurate location of i neutron orbital in the extreme neutron rich N = 82-126 region. This entails a new sub-shell closure at N = 112 due to the higher location of i neutron orbital, also consistent with the choice of orbitals in the generalized seniority scheme. However, a small reduction in the f two-body matrix elements is still required in the LSSM calculations to reproduce the experimental level energies as well as the transition probabilities in Sn isotopes in a consistent way.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1609.02325 [pdf]
    0 citations
  3. 03

    [Submitted on 8 Sept 2016]

    Quasi-particle random phase approximation with quasi-particle-vibration coupling: application to the Gamow-Teller response of the superfluid nucleus Sn

    Y. F. Niu · G. Colo · E. Vigezzi · C. L. Bai · H. Sagawa

    We propose a self-consistent quasi-particle random phase approximation (QRPA) plus quasi-particle-vibration coupling (QPVC) model with Skyrme interactions to describe the width and the line shape of giant resonances in open-shell nuclei, in which the effect of superfluidity should be taken into account in both the ground state and the excited states. We apply the new model to the Gamow-Teller resonance in the superfluid nucleus Sn, including both the isoscalar spin-triplet and the isovector spin-singlet pairing interactions. The strength distribution in Sn is well reproduced and the underlying microscopic mechanisms, related to QPVC and also to isoscalar pairing, are analyzed in detail.

    Comments:
    32 pages, 11 figures, 4 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1609.02341 [pdf]
    PRC(2016)·54 citations
  4. 04

    [Submitted on 8 Sept 2016]

    A symmetry conserving description of odd-nuclei with the Gogny force

    M. Borrajo · J. L. Egido

    We present an approach for the calculation of odd-nuclei with exact self-consistent blocking and particle number and angular momentum projection with the finite range density dependent Gogny force. As an application we calculate the nucleus Mg at the border of the inversion island. We evaluate the ground state properties, the excited states and the transition probabilities. In general we obtain a good description of the measured observables.

    Comments:
    8 pages, 4 figures, accepted for publication in Eur. Phys. J. A
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1609.02472 [pdf]
    EPJA(2016)·27 citations

Affiliations

first authorsco-authorsvia INSPIRE