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

Abstract

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.

Authors:
; ; ; ; ; ;  [1]; ; ; ; ; ; ;  [2];  [3];  [4]; ;  [5];  [6]
  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)
Publication Date:
OSTI Identifier:
20695815
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 70; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.70.064317; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Kmiecik, M., Maj, A., Brekiesz, M., Krolas, W., Meczynski, W., Styczen, J., Zieblinski, M., Million, B., Bracco, A., Camera, F., Benzoni, G., Leoni, S., Wieland, O., Brambilla, S., Herskind, B., Kicinska-Habior, M., Dubray, N., Dudek, J., and Schunck, N. Probing nuclear shapes close to the fission limit with the giant dipole resonance in {sup 216}Rn. United States: N. p., 2004. Web. doi:10.1103/PhysRevC.70.064317.
Kmiecik, M., Maj, A., Brekiesz, M., Krolas, W., Meczynski, W., Styczen, J., Zieblinski, M., Million, B., Bracco, A., Camera, F., Benzoni, G., Leoni, S., Wieland, O., Brambilla, S., Herskind, B., Kicinska-Habior, M., Dubray, N., Dudek, J., & Schunck, N. Probing nuclear shapes close to the fission limit with the giant dipole resonance in {sup 216}Rn. United States. doi:10.1103/PhysRevC.70.064317.
Kmiecik, M., Maj, A., Brekiesz, M., Krolas, W., Meczynski, W., Styczen, J., Zieblinski, M., Million, B., Bracco, A., Camera, F., Benzoni, G., Leoni, S., Wieland, O., Brambilla, S., Herskind, B., Kicinska-Habior, M., Dubray, N., Dudek, J., and Schunck, N. Wed . "Probing nuclear shapes close to the fission limit with the giant dipole resonance in {sup 216}Rn". United States. doi:10.1103/PhysRevC.70.064317.
@article{osti_20695815,
title = {Probing nuclear shapes close to the fission limit with the giant dipole resonance in {sup 216}Rn},
author = {Kmiecik, M. and Maj, A. and Brekiesz, M. and Krolas, W. and Meczynski, W. and Styczen, J. and Zieblinski, M. and Million, B. and Bracco, A. and Camera, F. and Benzoni, G. and Leoni, S. and Wieland, O. and Brambilla, S. and Herskind, B. and Kicinska-Habior, M. and Dubray, N. and Dudek, J. and Schunck, N.},
abstractNote = {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.},
doi = {10.1103/PhysRevC.70.064317},
journal = {Physical Review. C, Nuclear Physics},
number = 6,
volume = 70,
place = {United States},
year = {Wed Dec 01 00:00:00 EST 2004},
month = {Wed Dec 01 00:00:00 EST 2004}
}