Gamma-Ray Decay of the Bound Levels of B12

J. W. Olness and E. K. Warburton
Phys. Rev. 166, 1004 – Published 20 February 1968
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Abstract

Particle-γ and γγ coincidence measurements on the B11(d, pγ)B12 reaction were performed to determine the decay schemes of the bound excited states of B12. Branching ratios for the decay of the second excited state (1.67 MeV) to the ground state and first excited state (0.953 MeV) were determined to be (96.8±0.5) and (3.2±0.5)%, respectively. The 2.62-MeV third excited state was found to decay to the ground state with a branch of (6±1)%, and also to the first and second excited states with branches of (80±3) and (14±3)%, respectively. The last two values are from a γγγ coincidence measurement of the 2.62→1.67→0.95→0 triple cascade. Ge(Li) measurements of the 2.62→0.95 transition energy yield a value of 2620.8±1.2 keV for the excitation energy of the initial state. A lower limit on the ground-state decay of the 2.723-MeV level of >85% was determined from pγ coincidence measurements. These results are combined with previously available information on lifetimes, spins, and parities to permit a comparison with the shell-model predictions for the electromagnetic transitions connecting the bound levels of B12.

  • Received 13 October 1967

DOI:https://doi.org/10.1103/PhysRev.166.1004

©1968 American Physical Society

Authors & Affiliations

J. W. Olness and E. K. Warburton

  • Brookhaven National Laboratory, Upton, New York

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Issue

Vol. 166, Iss. 4 — February 1968

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