Experiments to Further the Understanding of the Triple-α Process in Hot Astrophysical Scenarios

Details Experiments to Further the Understanding of the Triple-α Process in Hot Astrophysical Scenarios Experiments to Further the Understanding of the Triple-α Process in Hot Astrophysical Scenarios

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aps..dnp.mg001p&link_type=abstract

American Physical Society, 2008 Annual Meeting of the Division of Nuclear Physics, October 23-26, 2008, abstract #MG.001

Physics

Nuclear Physics

Scientific paper

The first 0^+ state of ^12C at 7.654 MeV (the Hoyle state) is the most relevant in the triple-α process for carbon nucleosynthesis. In explosive scenarios such as supernovae, the interference of the Hoyle state with the second 0^+ state located at 10.3 MeV in ^12C becomes significant. The recent NACRE listing assumes a 2^+ resonance at 9.117 MeV for which no experimental evidence exists. The states above 7.654 MeV level in ^12C were populated through the β-decay of ^12B and ^12N produced at the ATLAS in-flight facility at ANL. The decay of ^12C into three alphas is detected in a twin Frisch grid ionization chamber, acting as a calorimeter. This minimizes the effects of β-summing and allowed us to investigate the minimum above the Hoyle state with much higher accuracy than previously possible. A detailed data analysis will include an R-matrix fit to determine an upper limit on the 2^+ resonance. Work is supported by U.S. DOE, ONP under contracts DE-AC02-06CH11357 (ANL), DE-FG02-04R41320 (WMU), NSF grant PHY01-40324, and JINA NSF-PFC grant PHY02-16783.

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