Study of the odd-A Rb isotopes using the Kr(/sup 3/He,d) and Kr(. cap alpha. ,p) reactions

Thesis/Dissertation · Fri Jan 01 00:00:00 EST 1982

OSTI ID:6737194

Stephans, G S.F.

Six odd-A isotopes of Rb have been studied using the (/sup 3/He,d) and (..cap alpha..,p) reactions on all stable, even-A isotopes of Kr. The krypton gas was contained in a closed gas cell which requires a relatively small amount of gas, thus enabling the use of the expensive lighter isotopes. Outgoing protons and deuterons were detected using nuclear emulsion plates in a multi-angle magnetic spectrograph. Angular distributions were compared with distorted-wave Born approximation calculations to assign spin and parity and extract transfer strengths. A set of optical-model parameters was found that reproduced the changes in both shape and magnitude of the (..cap alpha..,p) angular distributions between 18 and 26 MeV beam energies. The strong j dependence seen in the (..cap alpha..,p) data was also reproduced by the calculations. This j dependence, combined with the dependence of the (/sup 3/He,d) shapes, permitted unique spin and parity assignments for many states. The distributions of proton spectroscopic strength, measured in the (/sup 3/He,d) reactions, were compared with the results of simple core-particle calculations. The agreement was good for the 3/2/sup -/, 5/2/sup -/, and 5/2/sup +/ levels, but the 1/2/sup -/ and 9/2/sup +/ strengths were predicted to be more widely distributed than indicated by the experimental results. The (..cap alpha..,p) strength distribution for the lighter targets agreed well with the spectator model but deviations were seen near the closed neutron core at N = 50. These deviations were largest in the 3/2/sup -/ ground-state transitions in the /sup 84,86/Kr(..cap alpha..,p)/sup 87,89/Rb reactions. Semi-microscopic calculations did not explain this effect, although they did correctly predict the strength of several other states seen in the /sup 86/Kr(..cap alpha..,p) spectrum.

• Research Organization: Pennsylvania Univ., Philadelphia (USA)
• OSTI ID: 6737194
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
STRIPPING
HELIUM 3 REACTIONS
KRYPTON
RUBIDIUM ISOTOPES
ENERGY LEVELS
ANGULAR DISTRIBUTION
DEUTERONS
DWBA
ENERGY DEPENDENCE
EXPERIMENTAL DATA
MEV RANGE 10-100
PARITY
PROTONS
SHELL MODELS
SPECTROSCOPIC FACTORS
SPIN
ALKALI METAL ISOTOPES
ANGULAR MOMENTUM
BARYONS
BORN APPROXIMATION
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
DATA
DIRECT REACTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
FLUIDS
GASES
HADRONS
INFORMATION
ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
NONMETALS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEONS
NUMERICAL DATA
PARTICLE PROPERTIES
RARE GASES
TRANSFER REACTIONS
651823* - Nuclear Properties & Reactions
A=150-189
Experimental- Energy Levels & Transitions- (-1987)
651825 - Nuclear Properties & Reactions
A=150-189
Experimental- Nuclear Reactions & Scattering- (-1987)