THE RATIO L/K FOR Dy$sup 159$ AND Er$sup 165$ AND EVALUATION OF ENERGY TRANSITIONS Dy$sup 159$ $Yields$ Tb$sup 159$ AND Er$sup 165$ $Yields$ Ho$sup 16$$sup 5$ (in Russian)
Various methods for determining the decay energy of isotopes subjected to electron capture are discussed. The method of L/K was found tc be suitable for small energy transitions (< 200 kev) of isotopes with relatively simple decay schemes and having no strong cascade gamma radiation. The method has limitations due to incomplete K-capture theory and incomplete data on quantitative and qualitative regularities in the atomic shell electron reconstruction process. The L/K ratio was determined for two neutron-deficient isotopes, Dy/sup 159/ and Er/sup 165/,on the basis of the transition energy values of Dy/sup 159/ yields Tb/sup 159/ and Er/sup 165/ yields Ho/sup 165/. The design and performance of the gamma spectrometer with proportional counter used for measuring the L and K radiation are described. The decay schemes of Er/ sup 165/ and Dy/sup 159/ and levels of Tb/sup 159/ are presented. The decay energy of Dy/sup 159/ and Er/sup 165/ was less than 100 kev; consequently, the L/ K ratio method produced satisfactory results. (R.V.J.)
- Research Organization:
- Khlopin Radium Inst., Academy of Sciences, USSR
- NSA Number:
- NSA-13-005032
- OSTI ID:
- 4279825
- Journal Information:
- Izvest. Akad. Nauk S.S.S.R. Ser. Fiz., Vol. Vol: 22; Other Information: Orig. Receipt Date: 31-DEC-59
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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