Elsevier

Nuclear Physics A

Volume 568, Issue 1, 7 February 1994, Pages 107-120
Nuclear Physics A

Excitation and fission decay of 232Th by inelastic scattering of 17O at 84 MeV/u

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Abstract

Inelastic scattering of 84 MeV/u17O projectiles has been used to excite the giant resonances (GR) in 232Th. 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 232Th 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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Experiment performed at the GANIL National Facility, Caen, France.

1

On leave from Université Paris-XI, Institut de Physique Nucléaire, 91 406 Orsay, France.

2

On leave from Institute of Atomic Energy, Beijing, China.

3

Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794, USA.

4

On leave from University of San Paulo, supported by FAPESP, Brazil.

5

Present address GANIL, BP 5027, 14 021 Caen Cedex, France.

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