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Abstract. The Argonne Fragrnmt Mass Analyzer (FMA) is designed to separateend identi~evaporation residues according to their mass-to-chargersf.io.The _ in combination with GAMMASPHERE -an array of 100 comptonum dateotora -allowed for a number of very interesting in-beam gamma-spectroscopy studies, as suppressed germani the FMA provided a very clean trigger on evaporationresidues to obtain extremely background-free gamma-spectra.This mtup was used to measwe the totst gamma-energy and multiplicity after particle evaporation -the so-called entry distribution -by exploiting tbe calorimetric properties of GAMMASPHBRE, using its germaniumdetectors as well asits BOO shields for a maximum gammaeffiaeney. Thc enfry distributioncan be used to estimate the h&ght of the fission barrier as a function of angularmomentum.This method is especiallyfavorablefor unstablenuclei, for which the fission bamieris othexwiaevery difieult to measure. Here, the entry distributions of % at beam energies of 206 MeV and 219.S MeV in the '76Yb(4C@n) reacdon are presented. The results are comparedto a previousmeasurement.

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International audienc

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