8,184 research outputs found
Clustering in stable and unstable nuclei in -shell and -shell regions
According to microscopic calculations with antisymmetrized molecular
dynamics, we studied cluster features in stable and unstable nuclei. A variety
of structure was found in stable and unstable nuclei in the -shell and
-shell regions. The structure of excited states of Be was
investigated, while in -shell nuclei we focused on molecular states and
deformed states. The deformed states in Si and Ca were discussed
in connection with the high-lying molecular states. Appealing molecular states
in Ar and Mg were suggested. The results signified that both
clustering of nucleons and mean-field formation are essential features in
-shell nuclei as well as -shell nuclei.Comment: 5 pages, 2 figs, proceedings of the 8th International conference on
Clustering Aspects of Nuclear Structure and Dynamics, Nov. 2003, Nara, Japan,
to be published in Nucl.Phys.
Randomness extraction and asymptotic Hamming distance
We obtain a non-implication result in the Medvedev degrees by studying
sequences that are close to Martin-L\"of random in asymptotic Hamming distance.
Our result is that the class of stochastically bi-immune sets is not Medvedev
reducible to the class of sets having complex packing dimension 1
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