Capture Gamma Ray Spectroscopy and Related Topics [Procs by J. Vvasil, et al.

By J. Vvasil, et al.

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One was in the field of computer-based data acquisition; the other in high-resolution 7-spectroscopy. I was fortunate enough to participate in both of these in a very direct way. Data acquisition based on computers was novel in the early 1960's, when many discussions were held debating the utility of stored program devices against fixed program multiparameter analyzers. I vividly remember the comment of BNL's most prominent electronics expert, who assured me that the probability of thousands of flip-flops in a computer behaving flawlessly over an extended period of time was vanishingly small.

Because there is no natural central point in an 6 atomic nucleus, this is a very difficult job and the group of Pandharipande,Carlson,Wiringa,Pieper and co-workers 2 has come as far as mass A=10. Also no-core shell-model studies have been carried out recently, moving as far as A=10 and 12 compatible with present-day computer "technology"3. So models have come in very naturally: in particular, the shell-model has been the robust guide for over more than 50 years now. From the most simple hand-by-hand approach up to the present large-scale shell-model diagonalizations of the nuclear eigenvalue problem (reaching up to dimensions for a basis of « 109 in the fp shell-model space 4 ) , this has been used as a benchmark to explain many observed properties.

Otsuka et al. have shown 9 that for the sd shell, moving towards very neutron-rich systems like |4<9i6, a shell gap is developing between the lsi/2 and 2d3/2 orbitals giving rise to a new magic number at N=16. g. the proton ld 5 /2 and the neutron ld 3 / 2 orbitals). This mechanism is also at work in making the neutron gap at N=20 vanish for nuclei with proton number close to Z=ll,12. It can be used to study the relative changes of the l / 2 ~ and 1/2+ states going from 1 3 C to llBe onwards to 9He indicating that here, N=6 is now becoming the new magic number.

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