Measurement of E2 transitions in the Coulomb dissociation of {sup 8}B

Journal Article · Tue Dec 01 04:00:00 EST 1998 · AIP Conference Proceedings

OSTI ID:348231

Davids, B; Anthony, D W; Austin, S M; Bazin, D; Blank, B; Caggiano, J A; Chartier, M; Hui, P; Powell, C F; Scheit, H; Sherrill, B M; Steiner, M; Yurkon, J; Zeller, A ^[1]; Davids, B; Austin, S M; Caggiano, J A; Scheit, H; Sherrill, B M ^[2]; Anthony, D W ; Powell, C F ^[3]; Blank, B ^[4]; Esbensen, H ^[5]; Thirolf, P ^[6]

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1. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)
2. Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States)
3. Department of Chemistry, Michigan State University, East Lansing, Michigan 48824 (United States)
4. Centre dEtudes Nucleaires de Bordeaux-Gradignan, F-33175 Gradignan Cedex (France)
5. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
6. Ludwig Maximilians Universitaet Muenchen, Am Coulombwall 1, D-85748 Garching (Germany)

In an effort to understand the implications of Coulomb dissociation experiments for the determination of the {sup 7}Be(p,{gamma})thinsp{sup 8}B reaction rate, longitudinal momentum distributions of {sup 7}Be fragments produced in the Coulomb dissociation of 44 and 81 MeV/u{sup 8}B beams on a Pb target were measured. These distributions are characterized by asymmetries interpreted as the result of interference between E1 and E2 transition amplitudes in the Coulomb breakup. At the lower beam energy, both the asymmetries and the measured cross sections are well reproduced by first order perturbation theory calculations, allowing a determination of the E2 strength. The measurement yields S{sub E2}/S{sub E1}=6.7{sub {minus}1.9}{sup +2.8}{times}10{sup {minus}4} at the 0.63 MeV 1{sup +} resonance. If higher order dynamical effects are not negligible, then the E2 strength extracted here is a lower limit. {copyright} {ital 1998 American Institute of Physics.}

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 348231
• Report Number(s): CONF-980672--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 455; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BERYLLIUM
BERYLLIUM 7
BERYLLIUM 7 TARGET
BORON
BORON 8
BORON 8 REACTIONS
CAPTURE
COULOMB EXCITATION
E1-TRANSITIONS
E2-TRANSITIONS
GAMMA SPECTRA
LEAD 208 TARGET
PROTON REACTIONS