The Response of Nuclei Under Extreme Conditions
R.A. Broglia, G.F. Bertsch
Springer US, 1988 - Science - 412 pages
In recent years, a new field of nuclear research has been opened through the possibility of studying nuclei wi\h very large values of angular momentum, temperature, pressure and number of particles. This development has been closely associated with heavy ion reactions, since collisions between two heavy nuclei are especially effective in producing metastable compound systems with large angular momentum, and in transferring energy which is distributed over the whole nuclear volume. Under the strain of temperature and of the Coriolis and centrifugal forces, the nucleus displays structural changes which can be interpreted in terms of pairing and shape phase transit ions. This was the subject of the lectures of J. D. Garrett, P. J. Twin and S. Levit. While the rotational motion is, at zero temperature un damped, the width of giant resonances indicate that the nucleus only oscillates through few periods before the motion is damp ed by particle decay, and through coupling to the compound nucleus. Temperature and angular momentum influence in an im portant way the properties of both giant resonances and rotatio nal motion. These subjects were developed by K. Snover, and by P. F. Bortignon and R. A. Broglia, as well as by A. Bracco, A. Dellafiore and F. Matera.
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Shape and Pair Correlations in Rotating Nuclei
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Neutron Decay of Giant Resonances in
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angular momentum approach approximation average band barrier beam calculations channels charge classical collective collisions compared configuration considered correlations corresponding coupling cross section decay deformation density dependence described determined discussed distribution dynamics effects elements equation excitation energy expected experimental experiments factor field Figure final fission fluctuations force fragments frequency function fusion giant given gives heavy ion important increasing indicated initial interaction intrinsic isotopes Italy leads Lett limit loss mass matter mean measured motion neutron Nucl nuclear nuclei nucleons observed obtained pair parameter particle phase Phys physics possible potential predicted present probability processes production quantum quantum mechanical range reaction reference region relative resonance respect rotational separation shape shell shown shows single-particle spectra statistical strength structure surface symmetry temperature tion transfer transition values width