High-spin spectroscopy in the. gamma. -soft mass A = 130 region

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5094689

Beausang, C W

High spin states in the odd-proton nuclei {sup 133}Pr, {sup 135,137}Pm and {sup 131}La, the odd-neutron nucleus {sup 135}Nd and the doubly-odd nuclei {sup 134}Pr and {sup 136}Pm were studied following heavy-ion fusion-evaporation reactions using beams provided by the Stony Brook Tandem-LINAC accelerators. Gamma-rays produced following these reactions were measured using an array of four BGO suppressed Ge detectors. Experiments performed included excitation functions, angular distribution measurements and gamma-gamma coincidences. In addition in several cases internal conversion electrons were measured using a mini-orange electron spectrometer, which was constructed as part of this dissertation. The experimental crossing frequencies and signature splittings are compared with cranked shell model predictions as a function of nuclear triaxiality. Generally the odd-proton nuclei were found to possess prolate or near prolate collective shapes while odd neutron and double-odd nuclei possess more triaxial shapes. A collective oblate band based on the {pi}h{sub 11/2} {direct product} ({nu}h{sub 11/2}){sup 2} configuration is observed in {sup 131}La. Here the prolate collective core is driven to an oblate, but still collectively rotating shape by the rotational alignment of a pair of upper midshell h{sub 11/2} neutrons.

• Research Organization: State Univ. of New York, Stony Brook, NY (USA)
• OSTI ID: 5094689
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
645100 -- High Energy Physics-- Particle Interactions & Properties-Experimental
651100 -- Nuclear Physics-- Experimental Techniques-- (1980-)
651720 -- Nuclear Properties & Reactions
A=90-149
Experimental
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CALCULATION METHODS
DATA
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
HADRON REACTIONS
HIGH SPIN STATES
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
LANTHANUM 131
LANTHANUM ISOTOPES
MEASURING INSTRUMENTS
MEASURING METHODS
MINUTES LIVING RADIOISOTOPES
NEODYMIUM 135
NEODYMIUM ISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
PRASEODYMIUM 133
PRASEODYMIUM 134
PRASEODYMIUM ISOTOPES
PROMETHIUM ISOTOPES
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI