Probing nuclear shapes close to the fission limit with the giant dipole resonance in {sup 216}Rn

Journal Article · Wed Dec 01 00:00:00 EST 2004 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.70.064317· OSTI ID:20695815

Kmiecik, M; Maj, A; Brekiesz, M; Krolas, W; Meczynski, W; Styczen, J; Zieblinski, M ^[1]; Million, B; Bracco, A; Camera, F; Benzoni, G; Leoni, S; Wieland, O; Brambilla, S ^[2]; Herskind, B ^[3]; Kicinska-Habior, M ^[4]; Dubray, N; Dudek, J ^[5]; Schunck, N ^[6]

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1. Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342 Cracow (Poland)
2. Dipartimento di Fisica, Universita di Milano and INFN Sez. Milano, Via Celoria 16, 20133 Milan (Italy)
3. Niels Bohr Institute, Blegdamsvej 15-17, 2100 Copenhagen (Denmark)
4. Institute of Experimental Physics, Warsaw University, Warsaw (Poland)
5. Institut de Recherches Subatomiques and Louis Pasteur University, 23 rue du Loess, BP28 F-67037, Strasbourg Cedex 2 (France)
6. Department of Physics, 30BC04, University of Surrey, Guildford GU2 1XH (United Kingdom)

The gamma-ray decay of the giant dipole resonance (GDR) in the compound nucleus {sup 216}Rn formed with the reaction {sup 18}O+{sup 198}Pt at the bombarding energy of 96 MeV was investigated. High-energy gamma-ray spectra in coincidence with both prompt and delayed low-energy transitions were measured. The obtained GDR width at the average temperature <T>{approx_equal}1 MeV was found to be larger than that at T=0 MeV and to be approximately constant as a function of spin. The measured width value of 7 MeV is found to be consistent with the predictions based on calculations of the nuclear shape distribution using the newest approach for the treatment of the fission barrier within the liquid drop model. The present study is the first investigation of the giant dipole resonance width from the fusion-evaporation decay channel in this nuclear mass range.

• OSTI ID: 20695815
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 70, Issue 6; Other Information: DOI: 10.1103/PhysRevC.70.064317; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COMPOUND NUCLEI
DIPOLES
ENERGY-LEVEL TRANSITIONS
EVAPORATION MODEL
FISSION
FISSION BARRIER
GAMMA RADIATION
GAMMA SPECTRA
GIANT RESONANCE
LIQUID DROP MODEL
MEV RANGE
NUCLEAR DECAY
OXYGEN 18 REACTIONS
PLATINUM 198 TARGET
RADON 216
SPIN