Isomeric fission yield ratios for odd-mass Cd and In isotopes using the phase-imaging ion-cyclotron-resonance technique

V. Rakopoulos, M. Lantz, S. Pomp, A. Solders, A. Al-Adili, L. Canete, T. Eronen, A. Jokinen, A. Kankainen, A. Mattera, I. D. Moore, D. A. Nesterenko, M. Reponen, S. Rinta-Antila, A. de Roubin, M. Vilén, M. Österlund, and H. Penttilä
Phys. Rev. C 99, 014617 – Published 22 January 2019

Abstract

Isomeric yield ratios for the odd-A isotopes of Cd119127 and In119127 from 25-MeV proton-induced fission on natural uranium have been measured at the JYFLTRAP double Penning trap, by employing the phase-imaging ion-cyclotron-resonance technique. With the significantly improved mass resolution of this novel method isomeric states separated by 140 keV from the ground state, and with half-lives of the order of 500 ms, could be resolved. This opens the door for obtaining new information on low-lying isomers, which are important for nuclear structure, fission, and astrophysics. In the present work the experimental isomeric yield ratios are used for the estimation of the root-mean-square angular momentum Jrms of the primary fragments. The results show a dependency on the number of unpaired protons and neutrons, where the odd-Z In isotopes carry larger angular momenta. The deduced values of Jrms display a linear relationship when compared with the electric quadrupole moments of the fission products.

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  • Received 12 November 2018
  • Revised 4 December 2018

DOI:https://doi.org/10.1103/PhysRevC.99.014617

©2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

V. Rakopoulos1,*, M. Lantz1,†, S. Pomp1, A. Solders1, A. Al-Adili1, L. Canete2, T. Eronen2, A. Jokinen2, A. Kankainen2, A. Mattera1, I. D. Moore2, D. A. Nesterenko2, M. Reponen2, S. Rinta-Antila2, A. de Roubin2, M. Vilén2, M. Österlund1, and H. Penttilä2

  • 1Department of Physics and Astronomy, Uppsala University, Uppsala 75120, Sweden
  • 2Department of Physics, FI-40014 University of Jyväskylä, Finland

  • *vasileios.rakopoulos@physics.uu.se
  • mattias.lantz@physics.uu.se

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Vol. 99, Iss. 1 — January 2019

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