Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..apr.d2003l&link_type=abstract
American Physical Society, April Meeting, 2004, May 1-4, 2004, Denver, Colorado April 2004, MEETING ID: APR04, abstract #D2.003
Physics
Scientific paper
The effects of short-range T=1 pairing correlations between pairs of protons or neutrons are ubiquitous in intermediate and heavy mass near-stable nuclei and influence almost all aspects of their behavior. In principle, correlated neutron-proton pairing fields should also play a role, either with T=1 geometry, analogous to normal pairing, or with deuteron-like T=0 geometry. In practice, these neutron-proton pairing correlations are only expected to be important where the wave function overlap is good, particularly when the Fermi levels are equal, i.e. in N ˜Z nuclei. This requirement, combined with the desirability of a high level density and numerous particles for stable collective BCS pairing fields, limit the nuclei which are good candidates for study of neutron-proton pairing to a region between nickel and tin which lie very near the proton dripline and have only recently become accessible for detailed experimental study. In this talk I will review the state of investigation into neutron-proton correlations and their significance. I will briefly visit the very active area of theoretical investigation into this topic, then focus most of the talk on experimental signatures for correlations and their measurement, past, present and future. Information can be gleaned from binding energies, backbending, electromagnetic transition rates and transfer reactions. This research is supported by the U.S. department of Energy under contract number W-31-109-ENG-38.
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