Yield of K x rays emitted from U fragments

Kapoor, S. S. ; Ramamurthy, V.S. ; Zaghloul, R. (1969) Yield of K x rays emitted from U fragments Physical Review, 177 (4). pp. 1776-1782. ISSN 0031-899X

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Official URL: http://prola.aps.org/abstract/PR/v177/i4/p1776_1

Related URL: http://dx.doi.org/10.1103/PhysRev.177.1776


The yield of K x rays from different fragment masses have been determined in the thermal-neutron-induced fission of U235. The energies of the pairs of fragments were measured with two semiconductor detectors placed on either side of a thin U235 foil. The K x rays from the light and the heavy groups of fragments were separated by measuring the x-ray energies with a 1-mm NaI(Tl) crystal. The fragment mass distributions in coincidence with the light group of K x rays and with the heavy group of K x rays, and the unbiased mass distributions, were simultaneously recorded in different quarters of a 1024-channel analyzer memory. From these distributions, after suitable corrections for the background, x-rays detection efficiencies, and finite-energy-resolution effects, the number of x rays as a function of fragment mass has been determined. The x-ray yield per fission is found to be 0.08±0.01 for the light fragment group, and 0.30±0.02 for the heavy fragment group. The gross features of the yield as a function of mass are similar to those observed earlier for emission from Cf252 fragments. However, unlike the case of Cf252, for masses greater than 144 the striking increase in the yield is not observed. The present results are consistent with the interpretation that the x-ray yield depends both on the characteristics of the low-lying states and the initial spin of the fragments.

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