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Bochum 1998 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 53: Nuclear Astrophysics IV

HK 53.5: Vortrag

Mittwoch, 18. März 1998, 15:15–15:30, G

E1-E2 interference in the Coulomb dissociation of 7Li — •S. Typel and H. H. Wolter — Sektion Physik, Universität München, Am Coulombwall 1, D-85748 Garching

The break-up of 7Li into α and 3H can be considered as a test case for the Coulomb dissociation method to determine the astrophysical S-factor of the inverse radiative capture reaction 3H(α,γ)7Li. We calculate triple differential cross sections for the distribution of the break-up fragments in first-order semiclassical theory. The 7Li nucleus is described in a simple α-3H cluster model which predicts a S-factor, dominated by electric dipole transitions to the ground and first excited state, in accordance with direct measurements [1]. The asymmetry in the fragment distribution observed in a recent experiment with 42 MeV 7Li [2] for highly charged targets can be explained by an interference of E1 and E2 contributions in the Coulomb break-up. Here, in contrast to the capture reaction, only the ground state of 7Li is involved and E2 contributions are enhanced due to the large flux of the equivalent quadrupole photons.

supported by GSI, Darmstadt, contract LMWolT.

[1] C. R. Brune, R. W. Kavanagh, and C. Rolfs, Phys. Rev. C50, 2205 (1994)

[2] H. Utsunomiya et al., Phys. Lett. B, in press

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