The ({sup 7}Li,{sup 7}Be{gamma}) reaction and isovector spin strength in {sup 40}Ca

Journal Article · Mon Jul 01 04:00:00 EDT 1996 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.54.125· OSTI ID:286187

Winfield, J S; Beaumel, D; Gales, S; Laurent, H; Lhenry, I; Maison, J M ^[1]; Crawley, G M; Danczyk, S; Hirzebruch, S E; Stasko, J C; Suomijaervi, T ^[2]

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1. Institut de Physique Nucleaire, IN2P3-CNRS, 91406 Orsay Cedex (France)
2. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)

The {sup 40}Ca({sup 7}Li,{sup 7}Be{gamma}) reaction at {ital E}({sup 7}Li)/{ital A} = 70 MeV has been used to investigate isovector giant resonances and to measure the ratio of {Delta}{ital S}=1 to {Delta}{ital S}=0 spin strength in {sup 40}Ca at high excitation energy. In the singles spectrum, the analogue of the giant dipole resonance is observed. Another resonance is observed at {ital E}{sub {ital x}}{approx_equal}15 MeV in the residual nucleus, which we suggest is a collective 2{sup {minus}} state. The isovector spin transfer strength at high excitation for the calcium target is compared to that measured with a carbon target under the same experimental conditions. Although more spin transfer strength at high excitation is observed for the calcium target than for the carbon target, this only accounts in part for an apparent discrepancy between previous {sup 40}Ca({ital p}{searrow},{ital p}{searrow}{sup {prime}}) and {sup 12}C({sup 7}Li,{sup 7}Be) experiments. The general utility of the ({sup 7}Li, {sup 7}Be{gamma}) reaction is discussed. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 286187
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 1 Vol. 54; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BERYLLIUM 7
CALCIUM 40 TARGET
DIPOLES
EXCITATION
GIANT RESONANCE
ISOVECTORS
LITHIUM 7 REACTIONS
MEV RANGE 10-100
PHOTONS
SPIN