Astrophysically important ²⁶Si states studied with the ²⁸Si(p,t)²⁶Si reaction. II. Spin of the 5.914-MeV ²⁶Si level and galactic ²⁶Al production

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D. W. Bardayan,¹ J. A. Howard,² J. C. Blackmon,¹ C. R. Brune,³ K. Y. Chae,⁴ W. R. Hix,¹ M. S. Johnson,⁵ K. L. Jones,⁶ R. L. Kozub,² J. F. Liang,¹ E. J. Lingerfelt,^1,4 R. J. Livesay,⁷ S. D. Pain,⁶ J. P. Scott,^1,4 M. S. Smith,¹ J. S. Thomas,⁶ and D. W. Visser⁸
¹Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
²Physics Department, Tennessee Technological University, Cookeville, Tennessee 38505, USA
³Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA
⁴Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
⁵Oak Ridge Associated Universities, Bldg 6008, P. O. Box 2008, Oak Ridge, Tennessee 37831, USA
⁶Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
⁷Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
⁸Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599, USA

Received 7 February 2006; published 11 October 2006

The²⁸Si(p,t)²⁶Si reaction has been studied to resolve a controversy surroundingthe properties of the ²⁶Si level at 5.914 MeV andits contribution to the ²⁵Al(p, gamma )²⁶Si reaction rate in novae, whichaffects interpretations of galactic ²⁶Al observations. Recent studies have cometo contradictory conclusions regarding the spin of this level (0⁺or 3⁺), with a 3⁺ assignment implying a large contributionby this level to the ²⁵Al(p, gamma )²⁶Si reaction rate. We haveextended our previous study [Bardayan et al., Phys. Rev. C 65,032801(R) (2002)] to smaller angles and find the angular distributionof tritons populating the 5.914-MeV level in the ²⁸Si(p,t)²⁶Si reactionto be consistent with either a 2⁺ or 3⁺ assignment.We have calculated reaction rates under these assumptions and usedthem in a nova nucleosynthesis model to examine the effectsof the remaining uncertainties in the ²⁵Al(p, gamma )²⁶Si rate on ²⁶Alproduction in novae.

URL:	http://link.aps.org/doi/10.1103/PhysRevC.74.045804
DOI:	10.1103/PhysRevC.74.045804
PACS:	26.30.+k; 25.40.Hs; 27.30.+t; 97.10.Cv 26.30.+k Nucleosynthesis in novae, supernovae, and other explosive environments 25.40.Hs Nucleon-induced transfer reactions 27.30.+t Properties of nuclei with 20 A 38 97.10.Cv Stellar structure, interiors, evolution, nucleosynthesis, ages YEAR: 2006

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