Observation of substantial [ital p]-wave capture strength in the [sup 7]Li([ital [rvec p]],[gamma])[sup 8]Be reaction for [ital E][sub [ital p]]=80--0 keV and implications for astrophysical [ital S] factors

Journal Article · Mon Jun 20 00:00:00 EDT 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.3949· OSTI ID:7283555

Chasteler, R M; Weller, H R ^[1]; Tilley, D R ^[2]; Prior, R M ^[3]

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1. Duke University and Triangle Universities Nuclear Laboratory, Box 90308, Durham, North Carolina 27708-0308 (United States)
2. North Carolina State University and Triangle Universities Nuclear Laboratory, Raleigh, North Carolina 27695-8202 (United States)
3. West Georgia College, Carrollton, Georgia 30118 (United States)

The [sup 7]Li([ital [rvec p]],[gamma])[sup 8]Be reaction has been studied using polarized protons having an incident energy in the range [ital E][sub [ital p]](lab)=80--0 keV. The measured angular distributions of the cross section [sigma]([theta])/[ital A][sub 0] and analyzing power [ital A][sub [ital y]]([theta]) were interpreted using a model independent transition-matrix element analysis. The large ([similar to]40%) analyzing power at 90[degree] indicates the presence of an appreciable [ital p]-wave capture strength at these energies. The direct capture model is used to show that this could reduce the astrophysical [ital S] factor by as much as 40%.

• DOE Contract Number: FG05-91ER40619
• OSTI ID: 7283555
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:25; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

663300 -- Nuclear Reactions & Scattering
General-- (1992-)
663430* -- Nucleon-Induced Reactions & Scattering-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ALPHA DECAY RADIOISOTOPES
AMPLITUDES
ANALYZING POWER
ANGULAR DISTRIBUTION
BARYON REACTIONS
BEAMS
BERYLLIUM 8
BERYLLIUM ISOTOPES
BOSONS
CAPTURE
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
HADRON REACTIONS
ISOTOPES
LIGHT NUCLEI
LITHIUM 7 TARGET
MASSLESS PARTICLES
MATRIX ELEMENTS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
P WAVES
PARTIAL WAVES
PHOTONS
POLARIZED BEAMS
PROTON REACTIONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
TARGETS
TRANSITION AMPLITUDES