학술논문
Rotation of Nuclei as Observed in Ternary Fission of the Reaction 235U(nth,f) Induced by Polarized Neutron.
Document Type
Article
Author
Source
Subject
*NEUTRONS
*COLD neutrons
*NUCLEAR reactions
*ANGULAR correlations (Nuclear physics)
*NUCLEAR physics
*PHYSICAL sciences
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Language
ISSN
0094-243X
Abstract
Ternary fission of the standard reaction 235U(nth,f) induced by cold polarized neutrons has been investigated. Fission fragments and light charged particles were recorded in coincidence. Following cold neutron capture the compound nucleus 236U* has spin 3- or 4-. At the saddle point of the fissioning 236U* nucleus these states are collective. They are expected to retain a sizable collectivity down to the scission point. In fact, a collective rotation has been sensed by the shift in the angular distribution of the light charged particles which depends on the orientation of neutron polarization. Direct observation of the rotation of 236U* excited in a cold neutron reaction is reported here for the first time. It is proposed to call the new phenomenon the “ROT-effect”. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]