Abstract
The independent and/or cumulative cross-sections of 26 isotopes of silver, cadmium, indium, tin, and antimony from the fission of 238U with 450 MeV protons have been measured. The isotopic yield distribution for these elements is presented along with the charge dispersion for six mass chains, 109, 115, 117, 125, 127 and 129. The values of the most probable charge, Zp, for 14 mass chains were calculated and the variation of A Zp with A in the mass region 100–130 was determined. For A values between 100 and 120, the value of A Zp is relatively constant at a value of 2·424±0·004 if the charge dispersion width is assumed to be constant at a value of 2·90±0·10 Z units. In the mass region, 125–129, a width of 3·21 Z units and a slightly higher value of A Zp , 2·430±0·004, are required to account for the data. A mass yield curve encompassing this region of A was also determined.
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