Beta Decay of Be11

D. H. Wilkinson and D. E. Alburger
Phys. Rev. 113, 563 – Published 15 January 1959
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Abstract

Be11 has been made in the reaction B11(n, p)Be11 and its radiations have been studied with plastic and NaI(Tl) scintillation spectrometers both singly and in coincidence. The half-life as determined from measurements on both beta rays and gamma rays is 13.57±0.15 sec. Decay takes place by beta-ray emission to the ground state of B11 (61%, logft=6.77, βmax=11.48 Mev), to the 2.14-Mev first excited state (29%, logft=6.63), to the 6.76-6.81-Mev doublet (6.5%, logft=5.93) and to the 7.99-Mev level (4.1%, logft=5.53). Limits are set on the decay to several other levels, particularly those at 4.46 and 5.03 Mev (≤0.2%). Gamma rays of 2.121, 4.64, 5.86, 6.76, and 7.97 Mev are observed both singly and in coincidence with beta-ray branches. An energy separation Be11-B11=11.48±0.15 Mev is derived from the various beta and gamma-ray energy measurements. It is concluded that the assignment J=12 for Be11, as expected from the shell model, is possible but cannot be established firmly on the basis of the present evidence.

  • Received 30 September 1958

DOI:https://doi.org/10.1103/PhysRev.113.563

©1959 American Physical Society

Authors & Affiliations

D. H. Wilkinson* and D. E. Alburger

  • Brookhaven National Laboratory, Upton, New York

  • *Permanent address: Clarendon Laboratory, Oxford, England. This work was performed while this author was Visiting Physicist at Brookhaven National Laboratory during the summer of 1958.
  • Work performed under the auspices of the U. S. Atomic Energy Commission.

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Vol. 113, Iss. 2 — January 1959

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