• Open Access

Pygmy Gamow-Teller resonance in the N=50 region: New evidence from staggering of β-delayed neutron-emission probabilities

D. Verney, D. Testov, F. Ibrahim, Yu. Penionzhkevich, B. Roussière, V. Smirnov, F. Didierjean, K. Flanagan, S. Franchoo, E. Kuznetsova, R. Li, B. Marsh, I. Matea, H. Pai, E. Sokol, I. Stefan, and D. Suzuki
Phys. Rev. C 95, 054320 – Published 23 May 2017

Abstract

We report on the β-delayed neutron emission probability (P1n) measurements of the Ga82,83,84 (N=51,52,53) precursors performed in one single experiment using the He3 neutron-counter TETRA at the ALTO facility in Orsay. Altogether our results for the three A=82,83, and 84 Ga precursors point towards a sizable P1n staggering in the N=50 region, similar to the one already observed just after the N=28 shell closure in the K isotopes chain, hinting at a similar mechanism. We will discuss the possible microscopic origin of this behavior, i.e., the existence in the light N=51 isotones of low-lying components of the so called pygmy Gamow-Teller resonance, already well established at Z=36, and persisting toward Ni79.

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  • Received 20 March 2017

DOI:https://doi.org/10.1103/PhysRevC.95.054320

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

D. Verney1, D. Testov1,2,*, F. Ibrahim1, Yu. Penionzhkevich2,3, B. Roussière1, V. Smirnov2, F. Didierjean4, K. Flanagan5, S. Franchoo1, E. Kuznetsova2, R. Li1,†, B. Marsh6, I. Matea1, H. Pai7, E. Sokol2, I. Stefan1, and D. Suzuki1,‡

  • 1Institut de Physique Nucléaire, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
  • 2Joint Institute for Nuclear Research, Joliot-Curie 6, 141980 Dubna, Moscow region, Russia
  • 3National Research Nuclear University, Kashirskoye Shosse 31, Moscow 115409, Russia
  • 4Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
  • 5University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
  • 6CERN, CH-1211 Geneva 23, Switzerland
  • 7Nuclear Physics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700 064, India

  • *Present address: Dipartimento di Fisica e Astronomia and INFN, Sezione di Padova, Padova, Italy.
  • Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T2A3.
  • Present address: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama, 351-0198 Japan.

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Vol. 95, Iss. 5 — May 2017

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