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Phys. Rev. C 65, 035803 (2002) [9 pages]

Widths of astrophysically important resonances in 18Ne

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B. Harss*, C. L. Jiang, K. E. Rehm, J. P. Schiffer, J. Caggiano, P. Collon, J. P. Greene, D. Henderson, A. Heinz, R. V. F. Janssens, J. Nolen, R. C. Pardo, T. Pennington, R. H. Siemssen, A. A. Sonzogni, J. Uusitalo, and I. Wiedenhöver
Argonne National Laboratory, Argonne, Illinois 60439

M. Paul
Hebrew University, Jerusalem, Israel

T. F. Wang
Lawrence Livermore National Laboratory, Livermore, California 94550

F. Borasi and R. E. Segel
Northwestern University, Evanston, Illinois 60208

J. C. Blackmon and M. Smith
Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6354

A. Chen and P. Parker
Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520-8124

Received 27 September 2001; published 22 February 2002

The astrophysically important reaction 14O(α,p)17F has been studied through a measurement of the time-inverse p(17F,α)14O reaction using a radioactive 17F beam. Resonance parameters for several states above an excitation energy of 7 MeV in 18Ne have been obtained. Through a measurement of the partial widths for elastic and inelastic proton scattering, it was determined that for these resonances the contribution of the 14O(α,p)17F* branch populating the first excited state in 17F is small. The results indicate that the contribution of resonances above Ex=7MeV to the astrophysical (α,p) reaction rate is smaller than was previously assumed.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.65.035803
DOI:
10.1103/PhysRevC.65.035803
PACS:
25.60.Bx, 25.60.Je, 26.30.+k

*Also at Physics Department E12, Technische Universität München, München, Germany.

 
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