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Nuclear Theory·nucl-th

Friday·September 9, 2016

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    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

    nucl-thastro-ph.COhep-phJPS Conf.Proc.(2017)·1 citation
  2. 02

    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.

    nucl-th0 citations
  3. 03

    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.

    nucl-thPRC(2016)·54 citations
  4. 04

    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.

    nucl-thEPJA(2016)·27 citations
  5. 05

    X-ray bounds on the r-mode amplitude in millisecond pulsars

    Kai Schwenzer · Tuğba Boztepe · Tolga Güver · Eda Vurgun

    r-mode astroseismology provides a unique way to study the internal composition of compact stars. Due to their precise timing, recycled millisecond radio pulsars present a particularly promising class of sources. Although their thermal properties are still poorly constrained, X-ray data is very useful for astroseismology since r-modes could strongly heat a star. Using known and new upper bounds on the temperatures and luminosities of several non-accreting millisecond radio pulsars we derive bounds on the r-mode amplitude as low as and discuss the impact on scenarios for their internal composition.

    ↳ astro-ph.HEgr-qcnucl-thMNRAS(2017)·18 citations
  7. 07

    Unveiling the nucleon tensor charge at Jefferson Lab: A study of the SoLID case

    Zhihong Ye · Nobuo Sato🇺🇸 · Kalyan Allada🇺🇸 · Tianbo Liu🇺🇸 · Jian-Ping Chen🇺🇸 · Haiyan Gao🇺🇸 · Zhong-Bo Kang🇺🇸 · Alexei Prokudin🇺🇸 · Peng Sun🇺🇸 · Feng Yuan🇺🇸

    Future experiments at the Jefferson Lab 12 GeV upgrade, in particular, the Solenoidal Large Intensity Device (SoLID), aim at a very precise data set in the region where the partonic structure of the nucleon is dominated by the valence quarks. One of the main goals is to constrain the quark transversity distributions. We apply recent theoretical advances of the global QCD extraction of the transversity distributions to study the impact of future experimental data from the SoLID experiments. Especially, we develop a simple strategy based on the Hessian matrix analysis that allows one to estimate the uncertainties of the transversity quark distributions and their tensor charges extracted from SoLID data simulation. We find that the SoLID measurements with the proton and the effective neutron targets can improve the precision of the u- and d-quark transversity distributions up to one order of magnitude in the range 0.05 < x < 0.6.

    ↳ hep-phhep-exnucl-exnucl-thPLB(2017)·61 citations

Affiliations

first authorsco-authorsvia INSPIRE