Search for Gamow-Teller strength in the continuum via the [sup 3]He([ital n],[ital p])[sup 3]H reaction at 288 MeV

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.47.1563· OSTI ID:6650411

Celler, A; Yen, S; Alford, W P; Abegg, R; Brown, B A; Burzynski, S; Frekers, D; Haeusser, O; Helmer, R; Henderson, R S; Hicks, K; Jackson, K P; Jeppesen, R; Miller, C A; Moinester, M A; Pointon, B W; Trudel, A; Vetterli, M C ^[1]

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1. University of Western Ontario, London, Ontario, N6A 3K7 (Canada) TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3 (Canada) Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States) Simon Fraser University, Burnaby, British Columbia, V5A 1S6 (Canada) University of Melbourne, Parkville, Victoria, Australia 3052 (Australia) Ohio University, Athens, Ohio 45701 (United States) Tel-Aviv University, 69978 Ramat Aviv (Israel)

Cross sections for the [sup 3]He([ital n],[ital p]) reaction were measured at angles of 2.7[degree], 7.5[degree], 14.4[degree], 28.2[degree], and 34.9[degree] (c.m.) at an incident beam energy of 288 MeV. Outgoing protons were observed to energies corresponding to a [ital Q] value of [minus]40 MeV. The reduced cross section for the Gamow-Teller component of the ground-state isobaric-analog transition was determined to be [cflx [sigma]]=[sigma]([ital q]=0)/[ital B][sub GT]=6.9[plus minus]0.2 mb/sr. This value is significantly smaller than that observed for nuclei in the mass range 6[le][ital A][le]13. A multipole analysis of the data indicates that the cross section of the continuum up to a [ital Q] value of [minus]20 MeV involves mainly [Delta][ital L]=1 spin dipole transitions. The analysis determines an upper limit of 0.06 units of Gamow-Teller strength in transitions to excited states between 7 and 16 MeV, but is consistent with no Gamow-Teller strength in this region. Distorted wave impulse approximation calculations using transition amplitudes from a large-scale shell model calculation provide a good fit to the measured ground-state cross section, but fail to account for the magnitude of the measured cross sections to the continuum below 30 MeV excitation.

• OSTI ID: 6650411
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 47:4; ISSN 0556-2813; ISSN PRVCAN
• 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
BARYON REACTIONS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHARGE-EXCHANGE REACTIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DIRECT REACTIONS
DISTORTED WAVE THEORY
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GAMOW-TELLER RULES
HADRON REACTIONS
HADRONS
HELIUM 3 TARGET
HYDROGEN ISOTOPES
IMPULSE APPROXIMATION
ISOTOPES
LIGHT NUCLEI
MEV RANGE
MEV RANGE 100-1000
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
ODD-EVEN NUCLEI
PROTONS
RADIOISOTOPES
TARGETS
TRITIUM
YEARS LIVING RADIOISOTOPES