Gamma-Emitting States in O16 below 12 Mev

R. D. Bent and T. H. Kruse
Phys. Rev. 108, 802 – Published 1 November 1957
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Abstract

A study has been made of states in O16 between 7.2- and 11.5-Mev excitation which belong to the sequence 0, 1+, 2, 3+,... (even angular momentum and odd parity, and vice versa). These states cannot break up into C12+α but must decay by γ emission. The γ rays from the F19(p, αγ)O16 and N15(d, nγ)O16 reactions were studied at bombarding energies up to 6.0 and 5.08 Mev, respectively, using a three-crystal pair spectrometer and other scintillation counters. The design, resolution, and efficiency of the three-crystal pair spectrometer are given. The ground state transition from the 2, 8.87-Mev state was observed to have 0.07±0.02 the intensity of the 2.73-Mev cascade transition to the 3, 6.14-Mev state. A state was found at 10.98±0.04 Mev which decays predominantly to the 1, 7.12-Mev state. No γ rays resulting from the decay of this state to other states of O16 were observed. The angular correlation of the 3.86- and 7.12-Mev γ rays shows a positive anisotropy of approximately 1. These results suggest a 0 spin and parity assignment for the 10.98-Mev state. The predictions of the alpha-particle and shell models of O16 are compared with these results.

  • Received 18 July 1957

DOI:https://doi.org/10.1103/PhysRev.108.802

©1957 American Physical Society

Authors & Affiliations

R. D. Bent and T. H. Kruse

  • Columbia University, New York, New York

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Issue

Vol. 108, Iss. 3 — November 1957

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