Accession Number : AD0256007

Title :   EXPERIMENTAL EVIDENCE FOR CLUSTER STRUCTURES IN LIGHT AND MEDIUM WEIGHT NUCLEI

Corporate Author : FLORIDA STATE UNIV TALLAHASSEE

Personal Author(s) : SHELINE,RAYMOND K.

Report Date : MAR 1961

Pagination or Media Count : 1

Abstract : The assumption made in accordance with the cluster model is that nuclei may be considered to be composed of clusters (single nucleons, H-2, He-3, H-3, He-4, etc.). Comparison of cluster model predictions and experimental level schemes are made for the nuclei Li-7, Be-7, C-12, O-16, F-19, Ne-20, Ca-40, and Sc-43. Comparisons between the spectra of certain pairs of nuclei are particularly relevant from the viewpoint of the cluster model. Comparisons of the spectra of the following pairs of nuclei are made: N-16, O-17; F-19, Ne-20; K-40, Ca-41; and Sc-43, Ti-44. The cluster model also predicts levels of parity different than the ground state. The relative position of these nuclei are compared in nuclei in which the smallest cluster is varied from a single nucleon to larger clusters. This model further predicts that immediately after double closed-shell structures, nuclei with H-3 or He-3 clusters (e.g., F-19) will exhibit a strong decrease in this excitation energy. Results indicate substructures which are often more important than shell-model structures. (Author)

Descriptors :   *NUCLEAR MODELS, *NUCLEAR SHELL MODELS, *NUCLEAR STRUCTURE, *NUCLEI, *NUCLEONS, ALPHA PARTICLE SPECTROSCOPY, ALPHA PARTICLES, NUCLEAR ENERGY LEVELS, NUCLEAR SPINS, THEORY

Distribution Statement : APPROVED FOR PUBLIC RELEASE