Excitation And Fission Decay Of Th-232 By Inelastic-Scattering Of O-17 At 84mev/U

C Cabot,J Barrette,S K Mark,Randy L Turcotte, Jianli Xing,N Alamanos,Francois A Auger, Bridget A Fernandez,J Gastebois,A Gillibert, R J Lacey,R Liguorineto,P Rousselchomaz,A Miczaika, Y Blumenfeld,N Frascaria,J P Garron,J C Roynette,J A Scarpaci,T Suomijarvi,A Van Der Woude, A M Van Den Berg

NUCLEAR PHYSICS A（1994）

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Abstract

Inelastic scattering of 84 MeV/u O-17 projectiles has been used to excite the giant resonances (GR) in Th-232. The deduced parameters (width, energy, EWSR) of the isoscalar giant quadrupole resonance are in agreement with the known systematics. The observed giant monopole resonance strength, 100% of the EWSR, is consistent with other recent experimental results using heavy-ion projectiles. Strength is also observed at high excitation energy. The fission probability of GR in Th-232 has been measured by detecting the fission fragments in coincidence with the inelastically scattered particles. A structure is observed in the fission coincidence spectrum around 10 MeV, which can be attributed to the fission decay of giant resonances. The measured fission probability is consistent with statistical decay of the GQR.

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Key words

TH-232 (O-17, O-17'), E = 1435 MEV, MEASURED SIGMA (FRAGMENT, THETA), TH-232 DEDUCED ISOSCALAR GIANT QUADRUPOLE RESONANCE, PARAMETERS, DECAY FEATURES, FISSION PROBABILITY

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