Accession Number : AD0617942

Title :   PHENOMENOLOGICAL AND MICROSCOPIC ANALYSIS OF PROPERTIES OF EVEN-EVEN NUCLEI. PART A. PHENOMENOLOGICAL MODELS.

Descriptive Note : Annual rept. for 1 Feb 64-1 Feb 65,

Corporate Author : INSTITUTO DE INVESTIGACION AERONAUTICA Y ESPACIAL BUENOS AIRES (ARGENTINA) LABORATORIO DE RADIACIONES

Personal Author(s) : Heras,C. A. ; Abecasis,S. M. ; Bosch,H. E.

Report Date : MAR 1965

Pagination or Media Count : 131

Abstract : The general features of several nuclear models are described. Special attention is given to those nuclear models connected with the low-lying excited states of even-even nuclei. Two special forms of the unified model were considered: The vibrational model in which only surface collective oscillations are considered; and The rotational model in which the nuclear shape is taken as fixed, so that rotations are the only collective motions allowed. The rotational or strong coupling model has proved very successful in the interpretation of properties of nuclei in the mass regions 19<A<25; 150<A<190, and A>226. The excited states of even-even nuclei show certain regularities, allowing to distinguish different 'types' of spectra (Ma4, Sh1) characterized by the energy ratios between the excited levels and the character of these levels.

Descriptors :   (*EVEN EVEN NUCLEI, NUCLEAR MODELS), (*NUCLEAR PROPERTIES, EVEN EVEN NUCLEI), EXCITATION, NUCLEAR ENERGY LEVELS, PARITY, VIBRATION, ROTATION, SPHERES, ELLIPSOIDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE