Evaporation residues produced in spallation of 208Pb by protons at 500A MeV

L. Audouin; L. Tassan-Got; P. Armbruster; J. Benlliure; M. Bernas; A. Boudard; E. Casarejos; S. Czajkowski; T. Enqvist; B. Fernandez-Dominguez; B. Jurado; R. Legrain; S. Leray; B. Mustapha; J. Pereira; M. Pravikoff; F. Rejmund; M. -V. Ricciardi; K. -H. Schmidt; C. Stephan; J. Taieb; C. Volant; W. Wlazlo

doi:10.1016/j.nuclphysa.2006.01.006

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Evaporation residues produced in spallation of 208Pb by protons at 500A MeV

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Abstract

The production cross sections of fragmentation-evaporation residues in the reaction Pb+p at 500A MeV have been measured using the inverse-kinematics method and the FRS spectrometer (GSI). Fragments were identified in nuclear charge using ionisation chambers. The mass identification was performed event-by-event using the B-rho - TOF - Delta-E technique. Although partially-unresolved ionic charge states induced an ambiguity on the mass of some heavy fragments, production rates could be obtained with a high accuracy by systematically accounting for the polluting ionic charge states. The contribution of multiple reactions in the target was subtracted using a new, partly self-consistent code. The isobaric distributions are found to have a shape very close to the one observed in experiments at higher energy. Kinematic properties of the fragments were also measured. The total and the isotopic cross sections, including charge-pickup cross sections, are in good agreement with previous measurements. The data are discussed in the light of previous spallation measurements, especially on lead at 1 GeV.

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L. Audouin, L. Tassan-Got, P. Armbruster, J. Benlliure, M. Bernas, A. Boudard, E. Casarejos, S. Czajkowski, T. Enqvist, B. Fernandez-Dominguez, B. Jurado, R. Legrain, S. Leray, B. Mustapha, J. Pereira, M. Pravikoff, F. Rejmund, M. -V. Ricciardi, K. -H. Schmidt, C. Stephan, J. Taieb, C. Volant, W. Wlazlo. 2005-12-09. Evaporation residues produced in spallation of 208Pb by protons at 500A MeV. https://doi.org/10.1016/j.nuclphysa.2006.01.006

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