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E~ " (H. ' 3qSe~ / I --SloNe / -,-''-r-l ---1-U -' / Me a8t / / lUI'" jJ+f1J3. /1 ;--,/1/ -----,~--~"'//}//'/ / E// a76 /E/ (pl/Zj 35 · zmoc 2 IUIJ' I a••, 8r 77 '+B , ~1 77 :::a 36 KT 73mln MeV o Z J 1 Se": [Da54a,O r52,Se54 , Wa53J. Bu53, Er54, La55a,Ra 53, Re53, Sa 53a, Se55a, 5,,53]. 21. A=77. Refs. Ge": [Bu54a, Sa 53a]. As": [Bi55b, Br": [Bu53, Se54]. Kr": [Th 55a]. -,,'Sg-- p7ft (1) 8 @. 13 '"0 ..... P Z g. ,po :0 ~ :0 c:: to > t' ~ t:I 00 ~ 49 Isomers of half-life greater than 10-6 sec. 22.
According to electro- 38 D. E. ALBURGER: Nuclear Isomerism. Sect. 40. 2 (1=g. 2) ' where Eo is the energy of the level, E the energy supplied by the incident gamma ray, A the wavelength of the incident gamma ray and g is a statistical weight factor. Evidently (1 is maximum when E = Eo, but if E - Eo is large compared to then (1 will be very small since the energy supplied is on the wing of the resonance curve far from the peak value. Resonant scattering is difficult to observe because of the recoil of the nucleus in the gamma-ray emission and absorption processes.
A = 24 Ref. [Dr 56J·. 2¥ S/fJb/e (J 12Mit2 1 U. S. Atomic Energy Commission, Technical Information Service, Oak Ridge, Tennessee (Compiled by WAY, KING, KUNDU, MCGINNIS and VAN LIESHOUT. Nuclear Data Group, National Research Council, Washington, D. ) Sect. 42. 41 Isomers of half-life greater than 10- 6 sec. infonnationhasnot been reported. The lifetime may be estimated using Eq. 10) after making corrections for statistical weight and conversion. Information on the spins and parities of the isomeric or upper state and the lower (usually ground) state is given in the fifth column.