Ta$sup 181$ (p,n) W$sup 181$ AND Au$sup 197$ (p,n) Hg$sup 197$ EXCIATION FUNCTIONS BETWEEN 4 AND 13 MEV
Excitation functions for the Ta/sup 181/(p,n)W/sup 181/ and Au/sup 197/ (p,n)Hg/sup 197/ reactions were measured for incident proton energies from 4 to 13 Mev. The stacked foil method was used. The activity of the foils was measured by counting the gamma rays and X-rays emitted when the product nuclei decay by electron capture. Absolute values of the cross sections were measured at several energies for these reactions and were compared with the cross sections for compound nucleus formation given by Shapiro. Threshold energies for the (p,2n) reactions were obtained by comparing the present data with neutron yields obtained from long counter measurements. The (p,2n) thresholds are 7.5 Mev for Ta/sup 181/ and 8.3 Mev for Au/sup 197/. The absolute (p,2n) cross section values were also obtained. The total reaction cross sections above 7 Mev are compared with optical model calculations. Results confirm the assumption of a surface absorption potential. (auth)
- Research Organization:
- Univ. of California, Livermore
- NSA Number:
- NSA-16-015670
- OSTI ID:
- 4793019
- Report Number(s):
- UCRL-6582
- Journal Information:
- Nuclear Phys., Journal Name: Nuclear Phys. Vol. Vol: 30
- Country of Publication:
- United States
- Language:
- English
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