Angular distributions of fission fragments in the first chance fission of ^{198}Hg
Abstract
The angular distributions of fission fragments from the fission of ^{198}Hg produced in the reaction of 16.8 MeV to 40.0 MeV protons with ^{197}Au have been measured with mica track detectors. By the method of least squares the theoretical expression for W( θ) due to Halpern and Strutinski was fit to the experimental data, with K_{o}^{2}, the variance of the K quantum number distribution, maintained as a free parameter. Even at 2.1 MeV, the lowest excitation energy above the fission barrier reached in the present work, the values of K_{o}^{2} obtained are consistent with the availability of intrinsic states of excitation. Thus, 2∆ _{f}, the pairing energy at the saddle point, is apparently less than 2.1 MeV, indicating that any increase in the saddlepoint pairing energy over the ground state pairing energy is less than ≈ 25 % in ^{198}Hg.
 Publication:

Nuclear Physics A
 Pub Date:
 August 1971
 DOI:
 10.1016/03759474(71)901242
 Bibcode:
 1971NuPhA.172..185N