Radiative capture reaction /sup 3/He(. cap alpha. ,. gamma. )/sup 7/Be at low energies

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

DOI:https://doi.org/10.1103/PhysRevC.23.33· OSTI ID:6731788

Kim, B T; Izumoto, T; Nagatani, K

The radiative capture reaction /sup 3/He(..cap alpha..,..gamma..)/sup 7/Be at low energies has been analyzed on the basis of the direct capture model in order to provide a theoretical estimate of the stellar reaction rate. The scattering wave functions of /sup 3/He by ..cap alpha.. and the bound state wave functions of /sup 7/Be were constructed by the empirical model, the phenomenological Woods-Saxon potential model, and the orthogonality condition model; these models account for the measured elastic scattering and excitation energies of the low-lying states of /sup 7/Be. The total cross section factors S(E/sub c.m./) of the E1, M1, and E2 capture from the l=0--3 partial waves clearly show a rising behavior as the incident energy goes lower, which agrees with the experimental data. The negative scattering phase shifts, which can be associated with the presence of almost energy-independent inner oscillations in the relative wave function between /sup 3/He and ..cap alpha.. due to the Pauli exclusion principle, seem to be responsible for this behavior.

• Research Organization: Cyclotron Institute, Texas AandM University, College Station, Texas 77843
• OSTI ID: 6731788
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 23:1; 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
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
E1-TRANSITIONS
E2-TRANSITIONS
ELASTIC SCATTERING
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
FERMIONS
FUNCTIONS
GAMMA SPECTRA
HELIUM 3 TARGET
ISOTOPES
LEPTONS
LIGHT NUCLEI
M1-TRANSITIONS
MASSLESS PARTICLES
MULTIPOLE TRANSITIONS
NEUTRINOS
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
NUCLEI
PAULI PRINCIPLE
PERTURBATION THEORY
PHASE SHIFT
POTENTIALS
RADIATIONS
RADIOISOTOPES
SCATTERING
SOLAR NEUTRINOS
SOLAR PARTICLES
SOLAR RADIATION
SPECTRA
STELLAR RADIATION
TARGETS
TOTAL CROSS SECTIONS
WAVE FUNCTIONS
WOODS-SAXON POTENTIAL