Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprk10001f&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
The deformed N=Z nuclei between ^56Ni and ^100Sn were perceived as an ideal place to seek neutron-proton pairing correlations, as the valence neutrons occupy the same Nilsson orbits, and the shell model space is large enough to support a collective pairing field. The basic concept was that in a rotating nucleus with stable deformation, the breaking of pairs could be measured by observing a change in the nuclear moment of inertia at some critical frequency. New correlations, beyond the normal and well known nn and pp T=1 pair fields, were predicted to cause shifts in the frequency at which the pairs begin to break. Shifts have been recently observed (S.M. Fischer et al.), Phys. Rev. Lett. 87, 132501 (2001). ^, (N.S. Kelsall et al), Phys. Rev. C 64, 024309 (2001).. However, the true experimental situation is clearly much more complicated than the early expectations, especially with respect to shape. With the breaking of pairs comes considerable shape polarization, so the bands below and above the critical frequencies are quite different. Further, bands with quite different structure compete as the most energetically favorable, or yrast. Consequently, many of the techniques traditionally used to analyze ``backbending'' and ``alignments'' must be reappraised. We have collected extensive data on N=Z nuclei and their neighbors, particularly in selenium, bromine and krypton isotopes, in order to reach a better understanding of the anomalies in the moments of inertia. At present, there remain many puzzles and it is far from clear that information on the np-pairing field can be extracted from these anomalies.
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