SEARCH FOR COMPLETE ANGULAR MOMENTUM MULTIPLETS IN MOLYBDENUM-97 VIA THE (HELIUM-3, 2-NEUTRON PHOTON) REACTION (SPECTROSCOPY, NON-YRAST)
Abstract
Any odd-A nucleus may be thought of as the coupling of a single nucleon and an even-A core. This coupling results in an angular momentum multiplet for each single-particle state/core excitation combination. An attempt was made to populate and observe several of these complete multiplets using the ('96)Zr(('3)He, 2n(gamma))('97)Mo reaction at 11 MeV. This reaction utilizes the low binding energy of ('3)He nuclei to populate the non-yrast states which make up the majority of the states in the multiplets. Excitation functions, angular distributions, linear polarizations, gamma-gamma coincidence, and gamma-gamma directional correlations were measured and used to construct the ('97)Mo level scheme. Several new techniques for data analysis were developed and implemented including the extraction of spin information from the excitation functions and the joint analysis of angular distributions and linear polarizations. New computer software was also developed to aid in analyzing the data. Despite the new techniques, problems with the ('3)He reaction, primarily the break-up of the ('3)He projectile in the Coulomb field of the target, prevented the extraction of spin information for all but a few of the observed gamma rays. A rotational model calculation was performed for ('97)Mo and did a reasonably good job of reproducing the structure of the nucleus. Two complete angular momentum multiplets (the d(,5/2) and g(,7/2) R = 2 multiplets) were observed together with part of the h(,11/2) R = 2 multiplet. Fifteen states were observed which were not reproduced by the model and are possibly due to the coupling of single-particle states to the 0('+)' and 2('+)' "non rotational" states of the core.
Degree
Ph.D.
Subject Area
Nuclear physics
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