Multiplicity of K X rays and collective structure in the transitional nuclei with A⋍200

Karwowski, H. J. ; Vigdor, S. E. ; Jacobs, W. W. ; Kailas, S. ; Singh, P. P. ; Soga, F. ; Throwe, T. G. ; Ward, T. E. ; Wark, D. L. ; Wiggins, J. (1982) Multiplicity of K X rays and collective structure in the transitional nuclei with A⋍200 Physical Review C, 25 (3). pp. 1355-1378. ISSN 0556-2813

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The multiplicity MK of prompt K x rays emitted in (6,7Li, xn) reactions has been measured for twelve targets in the mass range 180≤A≤209, at bombarding energies between 55 and 124 MeV. From the high multiplicities of x rays (1≤MK≤3) characteristic of the observed evaporation residues, we infer that highly converting, low-energy M1 transitions constitute a substantial portion of the γ-decay cascades (especially at moderately high spin, (12≤I≤20) in a large number of nuclides in the transitional region between the shell closure at N=126 and the strongly deformed rare earths. The unexpectedly simple systematic variation of the MK measurements with neutron number within this mass region suggests that the converting transitions occur predominantly among members of as yet unknown, mildly deformed, high-K, deformation-aligned rotational bands. From the measured values of MK and the singles K x ray yields we extract absolute total cross sections for the (Li,xn) reactions. Expected statistical features of the x-ray multiplicity distributions and associated limits on the applicability of the present technique for evaporation-residue cross section determination are discussed.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:15621
Deposited On:13 Nov 2010 12:49
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