Elsevier

Nuclear Physics A

Volume 545, Issue 4, 17 August 1992, Pages 785-821
Nuclear Physics A

The 90Zr(n, p)90Y reaction at En=98 MeV

https://doi.org/10.1016/0375-9474(92)90530-WGet rights and content

Abstract

Double-differential cross sections of the 90Zr(n, p) reaction have been measured at 98 MeV in the angular range 0°–30° for excitation energies up to 40 MeV. The spectra have been interpreted in terms of direct and multistep reactions. The contributions from the latter have been calculated using a statistical theory of multistep direct reactions. The direct parts of the spectra have been decomposed into their different multipole components by using peak-fitting and multipole-decomposition techniques, based on sample angular distributions calculated within the distorted-wave Born approximation. An extensive microscopic calculation based on the random-phase approximation has also been performed and the results are compared with the experimental data. A value Sβ+ = 1.7±0.2 is extracted for the Gamow-Teller strength, suggesting an occupancy ν2 = 0.09±0.01 for the 1g92 proton orbital. This value has been compared with recent results from (d, 3He) proton pickup and (e, e′p) knockout reactions.

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    This work was financially supported by the Swedish Natural Science Research Council and by the National Science Foundation (PHY89-21025).

    1

    The authors wish to thank the The Svedberg Laboratory staff for significant contributions in the construction of the equipment and during the measurements. We also want to express our gratitude to R. Bonetti for providing the SMDE computer code. Thanks are due to N. Auerbach for several valuable discussions during the course of this work. Finally, we thank N.S.P. King for making available to us the enriched 90Zr samples.

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