WHAT ODD EVEN EFFECTS MEAN IN LOW ENERGY FISSION ?

M. Montoya (1)

1 IPNO - Institut de Physique Nucléaire d'Orsay

Odd even effects in fragment quantities from 233U(nth, f), 235U(nth, f) and 239Pu(nth, f) are, explained in terms of a statistical pair breaking mechanism during the descent from saddle to scission point. The probability that no pair will be broken is of the order of 1 per 1000. For 233U(nth, f) and 235U(nth,f), the average number of broken pair are 3.5 and 4., respectively, and the variances of the corresponding distributions are 1.4 and 1.3. The probability for one broken pair to be of protons (neutrons) is proportional to the numbers of proton (neutron) pairs in the system.

Domaines: Articles anciens; Physique Nucléaire Expérimentale [nucl-ex]

M. Montoya. WHAT ODD EVEN EFFECTS MEAN IN LOW ENERGY FISSION ?. International Workshop on Semiclassical and Phase Space Approaches to the Dynamics of the Nucleus, 1987, Aussois, France. pp.C2-353-C2-357, ⟨10.1051/jphyscol:1987254⟩. ⟨jpa-00226523⟩