2020 Impact factor 3.043
Hadrons and Nuclei
Eur. Phys. J. A 1, 11-13

Short note

Possible evidence for the entrance channel effect in reactions leading to $^{\bf 170}$W*

M. Kmiecik1 - A. Maj1,2 - B. Herskind2 - A. Bracco3 - R.A. Bark2 - M. Bergström2 - F. Camera3 - G. Hagemann2 - N. Hashimoto2 - A. Holm2 - S. Leoni3 - T. Saitoh2 - T.S. Tveter4

1 The Henryk Niewodniczanski Institute of Nuclear Physics, PL-31-342 Kraków, Poland
2 The Niels Bohr Institute, DK-2100 Copenhagen, Denmark
3 Universitá di Milano, Dipartimento di Fisica and INFN sez. Milano, I-20133 Milano, Italy
4 University of Oslo, N-0316 Oslo, Norway

Received: 30 October 1997

Abstract
The decay of 170W* formed in reactions with two different projectile - target combinations was studied. The observed differences in the average number of emitted neutrons suggest an entrance channel effect at the highest excitation energy and angular momentum. It may be explained by different excitation energies of the equilibrated system, resulting from the emission of pre-equilibrium $\alpha$-particles during a longer fusion time, in the more symmetric reaction.

PACS
25.70.-z Low and intermediate energy heavy-ion physics - 25.70.Gh Compound nucleus


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