Microscopic study of /sup 3/He(. cap alpha. ,. gamma. )/sup 7/Be electric-dipole capture reaction

Journal Article · Sun Feb 01 04:00:00 EST 1981 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.23.645· OSTI ID:6656337

Liu, Q K.K.; Kanada, H; Tang, Y C

The electric-dipole radiative capture reaction of /sup 3/He by ..cap alpha.., leading to the ground and first excited states of /sup 7/Be, is considered. The wave functions used are the result of a single-channel /sup 3/He+..cap alpha.. resonating-group calculation which yields not only correct /sup 3/He separation energies in both of these /sup 7/Be bound states, but also a satisfactory description of the /sup 3/He+..cap alpha.. scattering angular distributions in the low-energy region. As in our previous /sup 7/Li charge-form-factor study, the present investigation is entirely microscopic and has the following important characteristics: (i) totally antisymmetric wave functions are used, (ii) the c.m. motion is correctly accounted for, (iii) bound-state and continuum wave functions are obtained in a unified manner, and (iv) the wave functions used have correct asymptotic behavior. With no adjustable parameters, it is found that quite reasonable agreement with experiment can be obtained. In particular, the behavior of the branching ratio is satisfactorily reproduced. The only discrepancy is that the calculated total capture cross section is about 20--30 % too large, which is very likely related to the fact that, for simplicity, only the dominant /sup 3/He+..cap alpha.. cluster configuration has been included in the calculation.

• Research Organization: School of Physics, University of Minnesota, Minneapolis, Minnesota 55455
• OSTI ID: 6656337
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 23:2; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ALPHA REACTIONS
BERYLLIUM 7
BERYLLIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BOUND STATE
BRANCHING RATIO
CAPTURE
CHARGED-PARTICLE REACTIONS
CLUSTER MODEL
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
DIPOLES
ELECTRIC DIPOLES
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
ENERGY RANGE
EVEN-ODD NUCLEI
FORM FACTORS
FUNCTIONS
GAMMA SPECTRA
HELIUM 3 TARGET
ISOSPIN
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 01-10
MULTIPOLES
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
PARTICLE PROPERTIES
RADIOISOTOPES
RESONATING-GROUP METHOD
SPECTRA
TARGETS
VARIATIONAL METHODS
WAVE FUNCTIONS