Nonexistence of a 9.0-Mev Level in C12

D. E. Alburger and D. H. Wilkinson
Phys. Rev. 122, 1508 – Published 1 June 1961
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Abstract

An energy level in C12 at 9.0 Mev has been reported as a result of (p, γ, γ) triple coincidence measurements on the B10(He3, p)C12 reaction at EHe3=2.2 Mev. This reaction has been reinvestigated in a similar experimental arrangement by using alternately Pilot-B, CsI and NaI scintillators for detection of the protons. Only the Pilot-B, which had been used in the previous work, exhibits the proton group corresponding to a "9.0-Mev level" in C12. The triple coincidence effect in this case is actually due to the intense ∼17-Mev protons in the B10(He3, p)C12 reaction leading to the 4.43-Mev first excited state of C12 which upon entering the scintillator can inelastically scatter from carbon and produce secondary gamma radiation of 4.43 Mev. The net energy deposited in the scintillator has the appearance of a proton group to a 9.0-Mev level in C12 in triple coincidence with two 4.43-Mev gamma rays. The magnitude of the effect is calculated from published cross sections for inelastic scattering and it agrees with the apparent population intensity of the nonexistent "9.0-Mev level."

  • Received 16 January 1961

DOI:https://doi.org/10.1103/PhysRev.122.1508

©1961 American Physical Society

Authors & Affiliations

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

  • Brookhaven National Laboratory, Upton, New York

  • *Permanent address: Clarendon Laboratory, Oxford, England.

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Issue

Vol. 122, Iss. 5 — June 1961

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