Beta Decay of B12

David E. Alburger
Phys. Rev. 131, 1624 – Published 15 August 1963
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Abstract

The 3.23-MeV gamma-ray transition between the 7.66- and 4.43-MeV states of C12 has been observed in the beta decay of B12 by means of scintillation detectors and coincidence techniques. The B12 activity was made by the B11(d, p)B12 reaction using a Van de Graaff accelerator and a beam-chopping system for irradiation and delayed counting. All parts of the target-collimator assembly were constructed of beryllium in order to minimize bremsstrahlung production. Beta rays were detected in an 8-in.-diam by ¼-in.-thick Pilot-B scintillator and gamma rays were detected in two 5-in.×5-in. NaI counters placed on opposite sides of the source. Gamma-gamma coincidence measurements were made by displaying the output of each NaI detector in coincidence with a channel centered on the full-energy-loss peak of 4.43-MeV gamma rays in the opposite NaI detector. The additional requirement of a coincidence with the beta-ray detector was imposed for beta-gamma-gamma coincidence experiments. In both types of measurements the full-energy-loss and one-escape peaks of the 3.23-MeV gamma rays were observed. Based on the average result of two previous nuclear reaction measurements of the fractional decay of the 7.66-MeV state by the emission of 3.23-MeV gamma rays the present observation of these gamma rays leads to a value of (1.7±0.5)% for the beta-ray branching of B12 to the 7.66-MeV state of C12.

  • Received 15 April 1963

DOI:https://doi.org/10.1103/PhysRev.131.1624

©1963 American Physical Society

Authors & Affiliations

David E. Alburger

  • Brookhaven National Laboratory, Upton, New York

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Issue

Vol. 131, Iss. 4 — August 1963

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