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Cross section measurements and thermonuclear reaction rates for ^(48)Ca(p, γ)^(49)Sc and ^(48)Ca(p, n)^(48)Sc

Zyskind, J. L. and Davidson, J. M. and Esat, M. T. and Spear, R. H. and Shapiro, M. H. and Fowler, William A. and Barnes, C. A. (1979) Cross section measurements and thermonuclear reaction rates for ^(48)Ca(p, γ)^(49)Sc and ^(48)Ca(p, n)^(48)Sc. Nuclear Physics A, 315 (3). pp. 430-444. ISSN 0375-9474. doi:10.1016/0375-9474(79)90620-1.

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Absolute cross sections have been measured for the reaction ^(48)Ca(p, γ)^(49)Sc for 0.579 MeV ≦ Ep, lab ≦ 2.670 MeV and for the reaction ^(48)Ca(p, n)^(48)Sc for 0.956 MeV ≦ E_(p,lab) ≦ 2.670 MeV. Substantial competition effects in the cross section for ^(48)Ca(p, γ)^(49)Sc were observed at the thresholds for neutron emission to the 623 keV (3^+), 1143 keV (2^+) and 1402 keV (2^−) excited states of ^(48)Sc. Thermonuclear reaction rates were calculated from the measured cross sections for 0.1 ≦ T_9 ≦ 10.0. The new rates differ considerably from those used in earlier calculations of the production of the rare, neutron-rich intermediate mass nuclides during explosive carbon burning. In particular, the new rates may change the predicted abundances for ^(48)Ca, ^(49,50)Ti and ^(50)V substantially. The good agreement between current global Hauser-Feshbach models and the experimental data indicates that Hauser-Feshbach calculations can provide sufficiently reliable rates for astrophysical calculations in cases where experimental data are non-existent.

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Additional Information:© 1979 North-Holland Publishing Co. Received 23 October 1978. Supported in part by the National Science Foundation [PHY76-83685]. Fannie and John Hertz Foundation Fellow, September 1973-December 1977. It is a pleasure to acknowledge many helpful discussions with Dr. D. G. Sargood and his valuable participation in the calibration of the BF_3 "long counter" which was used in the present work for neutron detection.
Funding AgencyGrant Number
Fannie and John Hertz FoundationUNSPECIFIED
Subject Keywords:Nuclear reactions
Issue or Number:3
Record Number:CaltechAUTHORS:20150909-153421285
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Official Citation:J.L. Zyskind, J.M. Davidson, M.T. Esat, R.H. Spear, M.H. Shapiro, William A. Fowler, C.A. Barnes, Cross section measurements and thermonuclear reaction rates for 48Ca(p, γ)49Sc and 48Ca(p, n)48Sc, Nuclear Physics A, Volume 315, Issue 3, 5 March 1979, Pages 430-444, ISSN 0375-9474, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60141
Deposited On:11 Sep 2015 17:28
Last Modified:10 Nov 2021 22:30

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