Be9(α, n)C12 Reaction and the Parameters of the 7.66-Mev State of C12

F. Ajzenberg-Selove and P. H. Stelson
Phys. Rev. 120, 500 – Published 15 October 1960
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Abstract

The Be9(α, n)C12 reaction has been studied at E¯α=5.6 and 5.78 Mev. Neutron groups have been observed to the first three states of C12. The ratio of the population of the 4.43- and 7.66- Mev states has been determined to be 8.1±1 at E¯α=5.6 Mev. This value, together with information from a number of other sources, demonstrates that the 7.66-Mev state has Jπ=0+, that its width for alpha emission is approximately the Wigner limit (Γ8 ev) and that in ∼103% of the cases the state decays to the ground state of C12 by pair emission. It is also estimated that the 7.66-Mev state can decay by γ emission via the 2+, 4.43-Mev state with a probability of 15000. This information reinforces the proposal that the 7.66-Mev state has the necessary properties to participate in the buildup of the elements in red giant stars.

  • Received 6 June 1960

DOI:https://doi.org/10.1103/PhysRev.120.500

©1960 American Physical Society

Authors & Affiliations

F. Ajzenberg-Selove

  • Haverford College, Haverford, Pennsylvania

P. H. Stelson

  • Oak Ridge National Laboratory, Oak Ridge, Tennessee

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Issue

Vol. 120, Iss. 2 — October 1960

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