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Phys. Rev. C 65, 055801 (2002) [6 pages]

Identification of new states in 26Si using the 29Si(3He,6He)26Si reaction and consequences for the 25Al(p,γ)26Si reaction rate in explosive hydrogen burning environments

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J. A. Caggiano, W. Bradfield-Smith*, R. Lewis, P. D. Parker, and D. W. Visser
Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520

J. P. Greene and K. E. Rehm
Physics Division, Argonne National Laboratory, Argonne, Illinois 60439

D. W. Bardayan
Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

A. E. Champagne
Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27708

Received 29 November 2001; published 9 May 2002

We have studied the 29Si(3He,6He)26Si reaction and have identified new states in 26Si at Ex=5.140(10), Ex=5.678(8) MeV, and Ex=5.945(8). Based on these measurements and other recent evidence, we suggest spin-parity assignments of 1+ for the 5.678 MeV state and 3+ for the 5.945 MeV state, which would account for all the “missing” unnatural parity states in 26Si in the excitation energy region important to hydrogen burning in novae. New reaction rates are presented for the 25Al(p,γ)26Si reaction based on this possible assignment of states.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.65.055801
DOI:
10.1103/PhysRevC.65.055801
PACS:
26.30.+k, 25.40.Lw, 25.55.Hp, 27.30.+t

*Present address: Physics Department, Queens University, Kingston, Ontario, Canada K7L 3N6.

 
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