Nulcear-structure studies with the sup 45 Sc, sup 144 Sm, and sup 208 Pb (p,n) reactions at 136 MeV

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6051592

Mostajabodda'vati, M

Experiments were performed to measure neutron time-of-flight spectra from the (p,n) reaction on {sup 45}Sc, {sup 144}Sm, and {sup 208}Pb targets at about 136 MeV. In the {sup 45}Sc(p,n){sup 45}Ti reaction the author observes a 19/2{sup {minus}}, 17/2{sup {minus}} doublet at 4.3 MeV. Distorted Wave Impulse Approximation (DWIA) calculations for these transitions were performed using wave functions obtained from a shell-model calculation which considers five particles in the 1f-2p shell with no restriction. These calculations describe the experimental results well without renormalizational. The Gamow-Teller (GT) strength in {sup 45}Sc(p,n){sup 45}Ti was considered also; the strength observed in peaks is about 40% of the minimum value expected from the simple GT sum rule. In the {sup 144}Sm(p,n){sup 144}Eu reaction he observes a ({pi}h{sub 11/2}, {nu}h{sub 11/2}{sup {minus}1}) 11+, O {Dirac h}w stretched state at 2.2 MeV of excitation. A DWIA calculation for this transition with only the simple shell-model wave function needs to be normalized by 0.55 to agree with the experiment. More realistic wave functions were obtained from a 3p-3h shell-model calculation. The DWIA normalization factor required using these wave functions is essentially unity (0.95). The total observed GT strength in peaks is 40% of the GT sum rule value. A single peak is observed to be strongly excited in the {sup 208}Pb(p,n)-{sup 208}Bi reaction at large angles. The present experiment reveals that the observed peak is too board to be a single state and that the angular distribution cannot be described well by a DWIA calculation assuming only a single transition.

• Research Organization: Kent State Univ., OH (USA)
• OSTI ID: 6051592
• Country of Publication: United States
• Language: English

Related Subjects

651520* -- Nuclear Properties & Reactions
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651920 -- Nuclear Properties & Reactions
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BISMUTH 208
BISMUTH ISOTOPES
CHARGE-EXCHANGE REACTIONS
CHARGED-PARTICLE REACTIONS
DATA
ELECTRON CAPTURE RADIOISOTOPES
EUROPIUM 144
EUROPIUM ISOTOPES
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
HADRON REACTIONS
HEAVY NUCLEI
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEAD 208 TARGET
MEASURING INSTRUMENTS
MINUTES LIVING RADIOISOTOPES
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
ODD-ODD NUCLEI
PROTON REACTIONS
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SAMARIUM 144 TARGET
SCANDIUM 45 TARGET
SECONDS LIVING RADIOISOTOPES
SPECTROMETERS
TARGETS
TIME-OF-FLIGHT SPECTROMETERS
TITANIUM 45
TITANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES