Physics – Nuclear Physics
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aps..haw.bg003p&link_type=abstract
American Physical Society, 3rd Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan, October 1
Physics
Nuclear Physics
Scientific paper
The production of carbon in red giant stars relies significantly on the 1^st 0^+ excited state of ^12C at 7.65 MeV (the Hoyle state). The recent NACRE listing assumes a 2^+ resonance at 9.1 MeV,footnotetextAngulo et al, Nucl. Phys. A656 (1999) which could be considered as the 2^+ member of a deformed rotational band built on the Hoyle state. At temperatures of several billion Kelvin in explosive scenarios like supernovae where the 3α process is also relevant, this state would increase the astrophysical reaction rate by an order of magnitude.footnotetextFynbo et al, Nature 433 (2005) In order to determine this experimentally, the states of ^12C were populated through β-decay of ^12B and ^12N mirror nuclei produced at the ATLAS in-flight facility at Argonne. The decay of ^12C* into three alphas were detected in a twin ionization chamber, acting as a 4π calorimeter. This minimized the effect of β-summing and allowed us to investigate the minimum between the 1^st and the 2^nd 0^+ state with much better accuracy than previously possible. An R-Matrix analysis was performed to determine an upper limit on the 2^+ resonance in the 8-11 MeV region. Our data analysis thus far shows no evidence of a 2^+ state in this region. This work is supported by U.S. DOE, and NSF grants.
Deibel C. M.
Ernst Rehm K.
Greene Joshua
Greife Uwe
Henderson Douglas
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