Beta-ray branching and half-lives of B12 and N12

D. E. Alburger and A. M. Nathan
Phys. Rev. C 17, 280 – Published 1 January 1978
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Abstract

The ratio of B12 and N12 β-ray branches to the 4.44-MeV excited state of C12 was measured by detecting β rays in a 4π plastic scintillator and γ rays in two Ge(Li) detectors. Activities were made in the B11(d,p)B12 and B10(He3,n)N12 reactions using a chopped Van de Graaff beam. Data were stored in two successive computer time bins of two half-lives each in order to establish by subtraction the shape of the short-lived β-ray spectrum and its net number of counts. The ratio of these branches was found to be N12/B12 = 1.56±0.05. A measurement of the B12 absolute β-ray branch to the 4.44-MeV state via βγ coincidences using an NaI(T1) detector for the γ rays gave a value of 1.276±0.050%. Half-lives, obtained by multiscaling β-ray counts, were found to be 20.20±0.02 msec for B12 and 11.000±0.016 msec for N12. The mirror asymmetries derived from these results are δ=+0.044±0.034 for the decay to the 4.44-MeV state of C12 and δ=+0.129±0.008 for the branch to the ground state.

[RADIOACTIVITY B12, N12: Measured Iβ, Iγ, βγ coin, T12; deduced β-ray branches, mirror asymmetries.]

  • Received 17 August 1977

DOI:https://doi.org/10.1103/PhysRevC.17.280

©1978 American Physical Society

Authors & Affiliations

D. E. Alburger and A. M. Nathan*

  • Brookhaven National Laboratory, Upton, New York 11973

  • *Present address: Physics Department, University of Illinois, Urbana, Illinois 61801.

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Vol. 17, Iss. 1 — January 1978

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