Spin-triplet strength in the sup 3 H( rvec p ,. gamma. ) sup 4 He reaction at E sub p =2 MeV

Journal Article · Wed Jul 01 04:00:00 EDT 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.46.R15· OSTI ID:7235210

Pitts, W K ^[1]

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1. University of Wisconsin Madison, Madison, Wisconsin 53706 (United States)

The cross section {sigma}({theta}) and analyzing power {ital A}{sub {ital y}}({theta}) of the {sup 3}H({ital {rvec p}},{gamma}){sup 4}He reaction have been measured at an incident proton energy {ital E}{sub {ital p}}=2.00 MeV. The angular distribution of the spin-dependent cross section {sigma}({theta}){ital A}{sub {ital y}}({theta}) shows that both odd parity ({ital E}1) and even parity ({ital E}2,{ital M}1) transitions contribute to this reaction. Detailed matrix element fits result in a spin-triplet total cross section which is 0.72(+0.29,{minus}0.18)% of the total {sup 3}H({ital {rvec p}},{gamma}){sup 4}He reaction cross section. A nucleon-only calculation does not reproduce the data, and predicts a spin-triplet total cross section which is only 0.01% of the total cross section. The inclusion of meson exchange currents into this calculation increases the spin-triplet cross section to 0.5% of the total cross section, in agreement with the present results. A comparison of the calculated and fitted matrix elements is presented.

• OSTI ID: 7235210
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 46:1; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663430* -- Nucleon-Induced Reactions & Scattering-- (1992-)
663510 -- Nuclear Mass Ranges-- A=1-5-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANALYZING POWER
BARYON REACTIONS
BEAMS
CAPTURE
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
ENERGY RANGE
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
HADRON REACTIONS
HELIUM 4
HELIUM ISOTOPES
INFORMATION
ISOTOPES
LIGHT NUCLEI
MATRIX ELEMENTS
MEV RANGE
MEV RANGE 01-10
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
PARITY
PARTICLE PROPERTIES
POLARIZED BEAMS
PROTON REACTIONS
STABLE ISOTOPES
TARGETS
THEORETICAL DATA
TRITIUM TARGET