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Radiative decay of the second excited state of C-12

Authors
  • Mak, H.B.
  • Evans, H.C.
  • Ewan, G.T.
  • Mcdonald, Arthur B.
  • Alexander, T.K.
Publication Date
Oct 01, 1975
Identifiers
DOI: 10.1103/PhysRevC.12.1158
OAI: oai:inspirehep.net:107752
Source
INSPIRE-HEP
Keywords
License
Unknown
External links

Abstract

The branching ratio ΓradΓ for the electromagnetic decay of the 7.655 MeV second excited state of C12 has been measured by detecting the C12(0.0 MeV) recoils in coincidence with α particles from the C13(He3, α2)C12 (7.655 MeV) reaction at EHe3=4.00 MeV. Coincidence events were identified by means of time-of-flight, energy, and kinematic constraints. Thus, of all the C12 nuclei formed in the second excited state, only those decaying to the C12 ground state by either γ-ray or positron-electron pair emission were selected. Hence the experiment provides a direct measurement of ΓradΓ, where Γrad=Γγ+Γe±, and gives ΓradΓ=(4.15±0.34)×10−4, which is in good agreement with other recent measurements, and suggests that the previously accepted value of ΓradΓ=(2.9±0.3)×10−4 may be too low. The significance of this result is discussed with respect to helium burning rates in stars. NUCLEAR REACTIONS C13(He3, α), E=4.0 MeV; measured α-C12 coin. C12 level deduced ΓradΓ. Enriched target.

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