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α decay of the T=1, 2+ state in B10 and isospin symmetry breaking in the A=10 triplet

S. A. Kuvin, A. H. Wuosmaa, C. J. Lister, M. L. Avila, C. R. Hoffman, B. P. Kay, D. G. McNeel, C. Morse, E. A. McCutchan, D. Santiago-Gonzalez, and J. R. Winkelbauer
Phys. Rev. C 96, 041301(R) – Published 3 October 2017

Abstract

The rate of the T=1, 2+ to T=1, 0+ transition in B10 (T=1, Tz=0) is compared to the analog transitions in Be10 (T=1, Tz=1) and C10 (T=1, Tz=+1) to provide constraints on ab initio calculations using realistic nuclear forces. The relevant state in B10, at Ex=5.164 MeV, is particle unbound. Therefore, a determination of the B(E2) electromagnetic transition rate requires a precise and accurate determination of the width of the state, as well as the α-particle and γ-ray branching ratios. Previous measurements of the α-particle branching ratio are just barely in agreement. We report on a new study of the α-particle branch by studying the B10(p,p)B10* reaction in inverse kinematics with the HELIOS spectrometer. The α-particle branching ratio that we observe, 0.144±0.027, is in good agreement with the evaluated value and improves the associated uncertainty. The resulting experimental B(E2) value is 7.0±2.2 e2fm4 and is more consistent with a flat trend across the A=10 triplet than previously reported. This is inconsistent with Green's function Monte Carlo predictions using realistic three-nucleon Hamiltonians, which overpredict the B(E2) value in C10 and B10.

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  • Received 28 August 2017

DOI:https://doi.org/10.1103/PhysRevC.96.041301

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

S. A. Kuvin1, A. H. Wuosmaa1, C. J. Lister2, M. L. Avila3, C. R. Hoffman3, B. P. Kay3, D. G. McNeel1, C. Morse2, E. A. McCutchan4, D. Santiago-Gonzalez5,3, and J. R. Winkelbauer6

  • 1Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA
  • 2Department of Physics and Applied Physics, University of Massachusetts, Lowell, Massachusetts 01854, USA
  • 3Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 4National Nuclear Data Center, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 5Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
  • 6Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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Issue

Vol. 96, Iss. 4 — October 2017

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