Physics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..haw.sd012y&link_type=abstract
American Physical Society, First Joint Meeting of the Nuclear Physicists of the American and Japanese Physical Societies October
Physics
Scientific paper
Nuclear deep-hole states have been studied by measuring pickup and knockout reactions on various nuclei over more than thirty years, which have provided direct evidence of the existence of inner orbital shell structures in nuclei. However, we have not had rich information on the decay modes of the deep-hole states until now. A renewed interest in the deep-hole states has recently been shown in a close connection with the production, structure and decay of hypernuclei. The hole states of ^15N and ^15O are also related with the nucleon life-time measurement in water Čerenkov detectors. In order to investigate the microscopic structures and the fragmentation mechanism of deep-hole states, we have measured the ^12C(p,2p)^11B and ^16O(p,2p)^15N^* reaction at Ep = 392 MeV together with decay charged particles from s-hole states in ^11B and ^15N, using double-arm spectrometers and sixteen ΔE-E SSD telescopes. Our results of decay branching ratios can not be reproduced by the statistical model calculation but the effects of the suppression of α decays predicted by the microscopic cluster model with SU(3)(λμ) wave functions are recognized. The most remarkable feature of the enhancement of triton decays, however, can not be fully explained even by the SU(3) models. We have just made a new measurement of neutron and γ decays from hole states of ^15N. Its preliminary results will also be presented.
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