12C(7Li, t)16O and stellar helium fusion

Details 12C(7Li, t)16O and stellar helium fusion 12C(7Li, t)16O and stellar helium fusion

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978nupha.305..293b&link_type=abstract

Nuclear Physics A, Volume 305, Issue 1, p. 293-312.

Physics

Nuclear Physics

19

Nuclear Reactions

Scientific paper

The reaction 12C(7Li, t)16O has been studied at E(7Li) = 34 MeV with the LASL tandem accelerator and QDDD magnetic spectrometer. Angular distributions to levels with Ex < 11 MeV have been obtained from 0° to 90°, including 0°. The results have been analyzed with finite-range distorted-wave Born approximation theory. The α-particle spectroscopic factors and reduced widths obtained are compared with those calculated with group theory (SU(3)) and other models. The analysis of data for the 7.1 and 9.6 MeV Jπ = 1- levels, which are of great importance in stellar helium buring, yields a ratio, R, of dimensionless reduced α-widths θ2a(7.1 MeV)/θ2a(9.6 MeV) = 0.35b +/- 0.13. The observed line width of the 9.6 MeV level (Γc.m. = 390 +/- 60 keV) is less than the accepted value (Γc.m. = 510 +/- 60 keV) and implies θ2a(9.6 MeV) ~ 0.6. These results as well as data for the 6.92 MeV Jπ = 2+ and 10.35 MeV Jπ = 4+ ``α-cluster'' states indicate 0.09 < θ2a(7.1 MeV) < 0.33 with a mean value θ2a(7.1 MeV) = 0.14 +/- 0.04. The implication for stellar helium burning is discussed.

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