Analysis of pre- and post-scission neutrons emitted in the reaction sup 169 Tm( sup 36 Ar, f ) at E sub lab =205 MeV

Journal Article · Fri Dec 01 04:00:00 EST 1989 · Physical Review (Section) C: Nuclear Physics; (USA)

DOI:https://doi.org/10.1103/PhysRevC.40.2629· OSTI ID:7265461

Rossner, H; Hilscher, D; Hinde, D J; Gebauer, B; Lehmann, M; Wilpert, M ^[1]; Mordhorst, E ^[2]

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1. Hahn-Meitner-Institut Berlin, D-1000 Berlin 39, Federal Republic of Germany (Germany, F.R.)
2. Universitaet Hamburg, D-2000 Hamburg 50, (Germany, F.R.)

Pre- and post-scission neutron multiplicities for the reaction {sup 169}Tm({sup 36}Ar,{ital f}) at {ital E}{sub lab}=205 MeV were measured in coincidence with fission fragments of different masses and total kinetic energies. The mass and total kinetic energy dependence of the total neutron multiplicity as well as the width of the out-of-plane fission fragment correlation angle are well described by evaporation calculations. An average time before scission of several 10{sup {minus}20} s is deduced from the average pre-scission neutron multiplicity. The mass dependence of the post-scission neutron multiplicity is consistent with an energy division at scission proportional to the mass of the fragments. For the first time clear evidence for an increase in pre-scission neutrons with increasing total kinetic energy values has been observed. Possible interpretations of this unexpected behavior are discussed.

• OSTI ID: 7265461
• Journal Information: Physical Review (Section) C: Nuclear Physics; (USA), Journal Name: Physical Review (Section) C: Nuclear Physics; (USA) Vol. 40:6; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
ARGON 36 REACTIONS
BARYONS
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
ELEMENTARY PARTICLES
ENERGY
ENERGY RANGE
ENERGY SPECTRA
EVAPORATION MODEL
FERMIONS
FISSION
FRANCIUM 205
FRANCIUM ISOTOPES
HADRONS
HEAVY ION FUSION REACTIONS
HEAVY ION REACTIONS
HEAVY NUCLEI
ISOTOPES
KINETIC ENERGY
LIQUID DROP MODEL
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
MULTIPLICITY
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
ODD-EVEN NUCLEI
PROBABILITY
SPECTRA
TARGETS
THULIUM 169 TARGET