Measurement of the excitation energy of the 7.654 MeV state of 12C and the rate of the 3α reaction

Details Measurement of the excitation energy of the 7.654 MeV state of 12C and the rate of the 3α reaction Measurement of the excitation energy of the 7.654 MeV state of 12C and the rate of the 3α reaction

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976phrvc..13.1773n&link_type=abstract

Physical Review C (Nuclear Physics), Volume 13, Issue 5, May 1976, pp.1773-1779

Physics

Nuclear Physics

5

Scientific paper

The excitation energy of the second excited state of 12C has been measured to be 7654.00 +/- 0.20 keV. Combining this result with the recent precise measurement of the atomic mass of 4He by Smith and Wapstra, the Q value for the reaction 3α-->12C(7654.00) is determined to be 379.31 +/- 0.21 keV. This result implies a change of +9%, at a stellar temperature of 108 K, in the 3α reaction rate quoted in the recent compilation of Fowler, Caughlan, and Zimmerman. NUCLEAR REACTIONS 12C, 15N, 16O(p ,p'), E=34.75 MeV; magnetic spectrograph; measured excitation energies of 12C(7.65 MeV), 15N(7.56 MeV), and 16O(6.13 MeV) states with 200 eV uncertainties. Measurement related to astrophysical helium burning (3 α) rate.

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