------------------------------------------------------------ RECORD NO.: 1852441 INSPEC Abstract No: A82049044 AUTHOR: Pauling, L. CORP SOURCE: Linus Pauling Inst. of Sci. & Medicine, Palo Alto, CA, USA TITLE: Changes in the structure of nuclei between the magic neutron numbers 50 and 82 as indicated by a rotating-cluster analysis of the energy values of the first 2/sup +/ excited states of isotopes of cadmium, tin, and tellurium SOURCE: Proceedings of the National Academy of Sciences of the United States of America, vol.78, no.9, p. 5296-8 ISSN: 0027-8424 CODEN: PNASA6 PLACE OF PUBL: USA LANGUAGE: English YEAR: Sept. 1981 TREATMENT: T Theoretical or Mathematical ABSTRACT: Values of R, the radius of rotation of the rotating cluster, are calculated from the observed values of the energy of the lowest 2/sup +/ states of the even isotopes of Cd, Sn, and Te with the assumption that the cluster is alpha , p/sup 2/, and alpha , respectively. R shows a maximum at approximately=N=58, a minimum at approximately=N=62, and a second maximum at approximately=N=70. The increase to the first maximum is interpreted as resulting from the overcrowding of spherons (alphas and tritons) in the mantle (outer layer) of the nuclei, causing the cluster to change from rotating in the mantle to skimming over its surface; the decrease to the minimum results from the addition of three dineutrons to the core, expanding the mantle and permitting the rotating cluster to begin to drop back into it; and the increase to the second maximum results from the overcrowding of the larger mantle surrounding the core containing the semi-magic number 14 of neutrons rather than the magic number 8 for N=50. The decrease after the second maximum results from the further increase in the number of core neutrons to 20 (20 Refs.) DESCRIPTORS: nuclear cluster model; nuclear collective states and giant resonances; nuclear size; nuclear structure; nuclei with mass number 90 to 149 IDENTIFIERS: Cd; Sn; Te; rotational energy states; nuclear mantle; nuclear core; nuclear structure; magic neutron numbers; rotating-cluster analysis; spherons CLASS CODES: A2110F (Nuclear shape, charge, radius, form factors and structure functions); A2110R (Collective structure in nuclear levels); A2160G (Nuclear cluster models); A2760 (Properties of nuclei with 90