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Spins and level widths determined by nuclear resonance fluorescence measurements on75As

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

The lifetimes of the 822, 865 and 1075 keV levels in75As, as well as the spins of the latter two levels, were determined by resonant scattering of gamma rays. The primary radiation from 3000 and 5000 Ci60Co sources was Compton scattered to produce gamma radiation of the desired energy for photo-excitation in75As. The lifetimes of the three levels were found to be 2.00 ps, 0.60 ps and 0.32 ps respectively. The angular distributions of the resonantly scattered radiation from the 865 keV and 1075 keV levels are consistent with spins of 5/2 and 3/2 respectively. Lifetime values are compared with excited-core model calculations.

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Authors and Affiliations

  1. Merensky Institute for Physics, University Stellenbosch, Republic of South Africa

    P. J. Celliers & J. W. Koen

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  1. P. J. Celliers
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  2. J. W. Koen
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The authors wish to thank the Department of Radiotherapy at the Karl Bremer Hospital, Bellville, as well as the Research Institute for Fruit and Fruit Technology, Stellenbosch, for the use of the cobalt bombs. They would also like to extend their appreciation to their colleagues who assisted them during the course of the measurements.

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Celliers, P.J., Koen, J.W. Spins and level widths determined by nuclear resonance fluorescence measurements on75As. Z Physik A 282, 159–162 (1977). https://doi.org/10.1007/BF01408159

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  • DOI: https://doi.org/10.1007/BF01408159

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