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APS » Journals » Phys. Rev. Lett. » Volume 77 » Issue 4
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Phys. Rev. Lett. 77, 607–610 (1996)

Temperature Dependence of the Width of the Giant Dipole Resonance in 120Sn and 208Pb

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W. E. Ormand1,2, P. F. Bortignon3, and R. A. Broglia3,4
1Physics Department, 401 Nielsen Hall, University of Tennessee, Knoxville, Tennessee 37996-1200
2Physics Division, Oak Ridge National Laboratory, P.O. Box 2008, MS-6373, Oak Ridge, Tennessee 37831-6373
3Dipartimento di Fisica, Università Degli Studi di Milano, and Istituto Nazionale di Fisica Nucleare, Sezione di Milano,Via Celoria 16, 20133 Milano, Italy
4The Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark

Received 3 November 1995; published in the issue dated 22 July 1996

The giant-dipole resonance (GDR) in 120Sn and 208Pb is studied as a function of excitation energy, angular momentum, and intrinsic width. Theoretical evaluations of the full width at half maximum (FWHM) for the GDR strength function are compared with recent experimental data and are found to be in overall agreement. Differences observed between 120Sn and 208Pb are attributed to strong shell corrections in 208Pb favoring spherical shapes at low temperatures. At high temperature, the FWHM in 120Sn exhibits effects due to the evaporation width of the compound nucleus.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.607
DOI:
10.1103/PhysRevLett.77.607
PACS:
24.30.Cz, 27.60.+j, 27.80.+w
 
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