Transient times of fission in sup 40 Ar+ sup 232 Th peripheral collisions

Peripheral {sup 40}Ar+{sup 232}Th collisions at a bombarding energy {ital E}/{ital A}=30 MeV were studied by measuring coincidences of fission fragments with projectile fragments detected near the grazing angle. It is found that the sequential fission of the highly excited target residue nuclei is s...

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Bibliographic Details
Published in:Physical review letters 1990-05, Vol.64:21
Main Authors: Eckert, E., Kuehmichel, A., Pochodzalla, J., Hildenbrand, K.D., Lynen, U., Mueller, W.F.J., Rabe, H.J., Sann, H., Stelzer, H., Trautmann, W., Trockel, R., Wada, R., Cerruti, C., Lhenoret, P., Lucas, R., Mazur, C., Ngo, C., Ribrag, M., Tomasi, E., Demeyer, A., Guinet, D.
Format: Article
Language:English
Subjects:
ANGULAR MOMENTUM
ARGON 40 REACTIONS
CHARGED-PARTICLE REACTIONS
COINCIDENCE METHODS
COUNTING TECHNIQUES
ENERGY DEPENDENCE
ENERGY RANGE
FISSION
GEV RANGE
GEV RANGE 01-10
HEAVY ION REACTIONS
MATHEMATICAL MODELS
NUCLEAR PHYSICS AND RADIATION PHYSICS
NUCLEAR REACTIONS
PARTICLE PROPERTIES
PROBABILITY
SPIN
STATISTICAL MODELS
TARGETS 652020 > Nuclear Properties & Reactions, A=220 & above, Experimental
THORIUM 232 TARGET
TIME MEASUREMENT
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Summary:Peripheral {sup 40}Ar+{sup 232}Th collisions at a bombarding energy {ital E}/{ital A}=30 MeV were studied by measuring coincidences of fission fragments with projectile fragments detected near the grazing angle. It is found that the sequential fission of the highly excited target residue nuclei is severely hindered if their excitation energies, determined from the measured recoil momenta, exceed a value of abour 50--75 MeV. A transient time of fission of the order of 10{sup {minus}20} s is deduced.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.64.2483