High-resolution study of the Gamow-Teller (GT) strength in the Zn64(He3,t)Ga64 reaction

F. Diel, Y. Fujita, H. Fujita, F. Cappuzzello, E. Ganioğlu, E.-W. Grewe, T. Hashimoto, K. Hatanaka, M. Honma, T. Itoh, J. Jolie, Bin Liu, T. Otsuka, K. Takahisa, G. Susoy, B. Rubio, and A. Tamii
Phys. Rev. C 99, 054322 – Published 21 May 2019

Abstract

Gamow-Teller (GT) transitions starting from the Tz=+2 nucleus Zn64 to the Tz=+1 nucleus Ga64 were studied in a (p,n)-type (He3,t) charge-exchange reaction at a beam energy of 140 MeV/nucleon and scattering angles close to 0. Here, Tz is the z component of the isospin T. The experiment was conducted at the Research Center for Nuclear Physics (RCNP) in Osaka, Japan. An energy resolution of 34 keV was achieved by applying beam matching techniques to the Grand Raiden magnetic spectrometer system. With our good resolution, we could observe GT strength fragmented in many states up to an excitation energy of 11 MeV. By performing angular distribution analysis, we could identify states in Ga64 excited by GT transitions. The reduced GT transition strengths [B(GT) values] were calculated assuming the proportionality between the cross sections and the B(GT) values. Shell-model calculations using the GXPF1J interaction reproduced the B(GT) strength distribution throughout the spectrum. States with isospin T=3 were identified by comparing the Zn64(3He,t)64Ga spectrum with a Zn64(d,He2)Cu64 spectrum. Relative excitation energies of the corresponding structures are in good agreement, supporting the robustness of isospin symmetry in the mass number A=64 nuclei.

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  • Received 22 January 2018
  • Revised 22 March 2019
  • Corrected 4 June 2019

DOI:https://doi.org/10.1103/PhysRevC.99.054322

©2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Corrections

4 June 2019

Correction: Spacing errors appeared around the term B(GT) during the production cycle and have been fixed.

Authors & Affiliations

F. Diel1,*, Y. Fujita2,3,†, H. Fujita3, F. Cappuzzello4,5, E. Ganioğlu6, E.-W. Grewe7, T. Hashimoto3, K. Hatanaka3, M. Honma8, T. Itoh3, J. Jolie1, Bin Liu3, T. Otsuka9, K. Takahisa3, G. Susoy6, B. Rubio10, and A. Tamii3

  • 1Institut für Kernphysik, Universität zu Köln, D-50937 Cologne, Germany
  • 2Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
  • 3Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
  • 4Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, I-95125 Catania, Italy
  • 5Dipartimento di Fisica e Astronomia, Universitá di Catania, I-95125 Catania, Italy
  • 6Department of Physics, Istanbul University, Istanbul 34134, Turkey
  • 7Institut fur Kernphysik, Westfälische Wilhelms-Universität Münster, Germany
  • 8Center for Mathematical Science, University of Aizu, Aizu-Wakamatsu, Fukushima 965-8580, Japan
  • 9Department of Physics, University of Tokyo, Hongo, Bunkyo, Tokyo 113-0033, Japan
  • 10Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain

  • *fdiel@ikp.uni-koeln.de
  • fujita@rcnp.osaka-u.ac.jp

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Issue

Vol. 99, Iss. 5 — May 2019

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