Low-lying intruder and tensor-driven structures in As82 revealed by β decay at a new movable-tape-based experimental setup

A. Etilé, D. Verney, N. N. Arsenyev, J. Bettane, I. N. Borzov, M. Cheikh Mhamed, P. V. Cuong, C. Delafosse, F. Didierjean, C. Gaulard, Nguyen Van Giai, A. Goasduff, F. Ibrahim, K. Kolos, C. Lau, M. Niikura, S. Roccia, A. P. Severyukhin, D. Testov, S. Tusseau-Nenez, and V. V. Voronov
Phys. Rev. C 91, 064317 – Published 26 June 2015

Abstract

The β decay of Ge82 was re-investigated using the newly commissioned tape station BEDO at the electron-driven ISOL (isotope separation on line) facility ALTO operated by the Institut de Physique Nucléaire, Orsay. The original motivation of this work was focused on the sudden occurrence in the light N=49 odd-odd isotonic chain of a large number of J1 states (positive or negative parity) in Ga80 by providing a reliable intermediate example, viz., As82. The extension of the As82 level scheme towards higher energies from the present work has revealed three potential 1+ states above the already known one at 1092 keV. In addition our data allow ruling out the hypothesis that the 843 keV level could be a 1+ state. A detailed analysis of the level scheme using both an empirical core-particle coupling model and a fully microscopic treatment within a Skyrme-QRPA (quasiparticle random-phase approximation) approach using the finite-rank separable approximation was performed. From this analysis two conclusions can be drawn: (i) the presence of a large number of low-lying low-spin negative parity states is due to intruder states stemming from above the N=50 shell closure, and (ii) the sudden increase, from As82 to Ga80, of the number of low-lying 1+ states and the corresponding Gamow-Teller fragmentation are naturally reproduced by the inclusion of tensor correlations and couplings to 2p-2h excitations.

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  • Received 5 February 2015

DOI:https://doi.org/10.1103/PhysRevC.91.064317

©2015 American Physical Society

Authors & Affiliations

A. Etilé1, D. Verney2, N. N. Arsenyev3, J. Bettane2, I. N. Borzov3,4, M. Cheikh Mhamed2, P. V. Cuong5, C. Delafosse2, F. Didierjean6, C. Gaulard1, Nguyen Van Giai2, A. Goasduff1, F. Ibrahim2, K. Kolos2,*, C. Lau2, M. Niikura2,†, S. Roccia1, A. P. Severyukhin3, D. Testov2,7, S. Tusseau-Nenez2, and V. V. Voronov3

  • 1CSNSM, CNRS/IN2P3 and Université Paris Sud, Orsay, France
  • 2Institut de Physique Nucléaire, CNRS/IN2P3 and Université Paris Sud, Orsay, France
  • 3Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Russia
  • 4National Research Center “Kurchatov Institute”, Moscow, Russia
  • 5Center for Nuclear Physics, Institute of Physics, Vietnam Academy of Science and Technology, Hanoi, Vietnam
  • 6Institut Pluridisciplinaire Hubert Curien, CNRS/IN2P3 and Université de Strasbourg, Strasbourg, France
  • 7Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, Dubna, Russia

  • *Present address: University of Tennessee, Knoxville, Tennessee 37996, USA.
  • Present address: Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

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Vol. 91, Iss. 6 — June 2015

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