29 research outputs found
One- and two-proton transfer reactions with vibrational Nuclei
We extend a semiclassical model of transfer reactions to the case in which
one of the collision partners is a vibrational nucleus. The model is applied to
one- and two-proton stripping reactions in the 37Cl + 98Mo system, for which a
rapid transition from normal to anomalous slope in the two proton transfer
reaction at energies around the Coulomb barrier is experimentally observed.
This behavior is satisfactorily reproduced by the present extension of the
model.Comment: LaTeX, 10 pages, 1 figure (PostScript
Backbending in Dy isotopes within the Projected Shell Model
A systematic study of the yrast band in 154-164 Dy isotopes using the
Projected Shell Model is presented. It is shown that, in the context of the
present model, enlarging the mean field deformation by about 20 % allows a very
good description of the spectrum of yrast band in these isotopes. The
dependence of the B(E2) values on angular momentum is also better described
when larger deformations are used. The observed oscillation of g-factors at low
spin states remains an open question for this model.Comment: 17 pages, 7 figures, submitted to Phys. Rev.
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THE CLASSICAL-LIMIT S-MATRIX and ORBITAL DYNAMICS IN SEMECLASSICAL COULOMB EXCITATION THEORY
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Squids, supercurrents, and slope anomalies: Nuclear structure from heavy-ion transfer reactions
Within the past five years we have developed experimental techniques to study heavy-ion transfer reactions to high spin states in deformed nuclei. These methods have been turned into a quantitative tool to assess the influence of collective excitation on single-particle and pairing structure. I discuss some of the nuclear structure questions which are being answered in these experiments: How strong is ground state pairing How does pairing change with angular momentum Why is two-neutron transfer much stronger than expected at large radial separation What is the evidence for a nuclear Josephson Effect What is the evidence for a nuclear Berry phase effect (nuclear SQUID) Why does one-neutron transfer populate much higher spins than would be naively expected Conversely, why does two-neutron transfer populate much lower spins than anyone expected The answer to each of these questions involves the influence of detailed nuclear structure on transfer reactions, and represents quantitative new information about the effect of angular momentum and excitation energy on many-body systems with a finite number of particles. 8 refs., 6 figs
THEORY OF COULOMB-NUCLEAR INTERFERENCE FOR HEAVY-ION EXCITATION OF ROTATIONAL STATES
In the absence of democracy (meaning regular change at the top by means of free and fair elections), political violence is a certainty
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THEORY OF COULOMB-NUCLEAR INTERFERENCE FOR HEAVY-ION EXCITATION OF ROTATIONAL STATES
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TRANSFER INVOLVING DEFORMED NUCLEI
Results are reviewed of 1- and 2-neutron transfer reactions at near-barrier energies for deformed nuclei. Rotational angular momentum and excitation patterns are examined. A strong tendency to populating high spin states within a few MeV of the yrast line is noted, and it is interpreted as preferential transfer to rotation-aligned states. 16 refs., 12 figs