Deutsche Tagung f ¨ur Forschung mit ... - SNI-Portal

Teilchen und Kerne Poster: Do., 13:00–15:30 D-P413
Search for scission neutrons using specific angular correlation in 235U fission
induced by slow polarized neutrons
Gevorg Danilyan 1 , Peter Granz 2 , Viacheslav Krakhotin 1 , Valery Pavlov 1 ,
Pavel Shatalov 1 , Margarita Russina 2 , Thomas Wilpert 2 , Ernst Brakhman 1
1 ITEP, B. Cheremushkinskaya 25, Moscow, 117218, Russia – 2 BENSC - HMI,
Glienicker str. 100, D-14, 109, Berlin, Germany
The experimental data concerning scission (or pre-scission) neutrons are very contradictory
- the relative part of these neutrons in the prompt fission neutrons varies from
1 % to 35 % due to arbitrary assumptions made in different analysis. To solve this
problem we have used new alternative method to search for the scission neutrons. We
have found the left-right asymmetry of prompt-fission-neutron (PFN) emission caused
by sp-wave interference in entrance channel of the reaction and the P -odd asymmetry
of the PFN emission caused by parity nonconservation at exit channel of the fission
process. Both effects cannot reside in PFN evaporated by excited fission fragments.
The scission (or pre-scission) neutrons are responsible for these effects.