Gamma ray spectroscopy using /sup 40/Ca + /sup 28/Si reactions

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5539288

Mulligan, L J

High spin states of various nuclei have been observed using the techniques of ..gamma.. -ray spectroscopy. These states were populated with heavy-ion fusion-evaporation type reactions. In particlular the /sup 40/Ca(/sup 28/Si,X) reactions were used at beam energies of 93.5 and 102 MeV. Five different reactions have been observed and their relative production yields have been measured. These reactions are ..cap alpha..2p, 3p, 4p, 2pn, and 3pn leading to the nuclei /sup 62/Zn, /sup 65/Ga, /sup 64/Zn, /sup 65/Ge, and /sup 64/Ga respectively. Gamma rays from these nuclei have been studied using Ge(Li) detectors. The measurements performed with these detectors include ..gamma..-..gamma.. coincidence measurements, ..gamma..-ray angular distributions, delayed activity measurements using a beam chopper, neutron-..gamma.. and neutron-..gamma..-..gamma.. coincidence measurements. /sup 62/Zn proved to be the most fruitful nucleus to study. Several new states were observed including ones at 4905 keV, 6082 keV, 7423 keV and 8584 keV. These states have probable spins of 7, 9, 11, and 12. We have compared our data with the predicitions of the cluster-vibration model and a band-mixing Hartee-Fock model. Rotational or quasi-rotational bands predicted by these models are observed in our data. New data on two other nuclei were obtained with the /sup 40/Ca + /sup 28/Si reactions. These are /sup 65/Ga and /sup 64/Ge. Very little has been published about these nuclei. Only the ground state was known for /sup 65/Ge. We have constructed a possible decay scheme with states as high as 5207 keV and spins up to 23/2. The ground state band has been compared to the predictions of the rotational particle coupling (RPC) model. For /sup 64/Ga we were able to make spin suggestions of J=4 for two previously observed states at 537 keV and 707 keV.

• Research Organization: Pennsylvania Univ., Philadelphia (USA)
• OSTI ID: 5539288
• Country of Publication: United States
• Language: English

Related Subjects

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ANGULAR MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CALCIUM 40 REACTIONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CLUSTER MODEL
DATA
DECAY
DIRECT REACTIONS
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FERMIONS
GALLIUM 64
GALLIUM 65
GALLIUM ISOTOPES
GAMMA SPECTROSCOPY
GERMANIUM 65
GERMANIUM ISOTOPES
HADRONS
HARTREE-FOCK METHOD
HEAVY ION REACTIONS
HIGH SPIN STATES
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
MANY-NUCLEON TRANSFER REACTIONS
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MINUTES LIVING RADIOISOTOPES
MULTI-NUCLEON TRANSFER REACTIONS
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
PARTICLE PROPERTIES
PROTONS
RADIOISOTOPES
SILICON 28 TARGET
SPECTROSCOPY
SPIN
STABLE ISOTOPES
TARGETS
TRANSFER REACTIONS
ZINC 62
ZINC 64
ZINC ISOTOPES