Elsevier

Nuclear Physics A

Volume 555, Issue 2, 12 April 1993, Pages 477-498
Nuclear Physics A

Measurements in the beam direction of the 40Ar projectile fragmentation at 44 MeV/A

https://doi.org/10.1016/0375-9474(93)90297-BGet rights and content

Abstract

Accurate beam-direction measurements ((0±3) mrad) have been performed on the 40Ar projectile fragmentation on a Ni target, at 44 MeV/u, by using the telescopic mode on the double spectrometer LISE at GANIL. Sampling results on Al and Au targets are also presented. Velocity distributions are analysed for fragments of masses from 10 to 45. As expected from a study of the forward-angle physics, the presented beam-direction measurements (0°) and the grazing-angle ones (3°) exhibit important differences. The most probable velocities are found much closer to the beam one at 0° than at 3°. The velocity-integrated mass yields obtained in the beam direction exhibit a regular exponential rise from A∼18 to A∼40; they are found larger or much larger than at the grazing angle, at variance with the less populated light proton-rich fragments. Integrated yields are found dependent on these new results. A non-dissipative process has to be invoked in the beam direction. The role of diffraction is to be examined. No unique mechanism can explain the whole set of results now available.

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    Experiment performed at the GANIL facility.

    1

    GANIL BP 5027 F14021 CAEN.

    2

    Present address: DAPNIA CEA SACLAY.

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