Source shape determination with directional fragment-fragment velocity correlations
A. Le Fevre, C. Schwarz, G. Auger, M.L. Begemann-Blaich, N. Bellaize,, R. Bittiger, F. Bocage, B. Borderie, R. Bougault, B. Bouriquet, J.L. Charvet,, A. Chbihi, R. Dayras, D. Durand, J.D. Frankland, E. Galichet, D. Gourio, D., Guinet, S. Hudan, P. Lautesse, F. Lavaud, R. Legrain
TL;DR
This paper introduces a method using directional fragment velocity correlations to determine the shape of nuclear breakup volumes, successfully applied to xenon-tin collisions revealing a prolate shape aligned with the beam.
Contribution
The study presents a novel approach using directional fragment velocity correlations to accurately determine the shape of the breakup volume in nuclear collisions.
Findings
Prolate shape with an axis ratio of 1:0.7 was deduced.
Method shows sensitivity comparable to conventional correlation techniques.
Application to 129Xe + natSn collisions at 50 MeV/nucleon demonstrated effectiveness.
Abstract
Correlation functions, constructed from directional projections of the relative velocities of fragments, are used to determine the shape of the breakup volume in coordinate space. For central collisions of 129Xe + natSn at 50 MeV per nucleon incident energy, measured with the 4pi multi-detector INDRA at GSI, a prolate shape aligned along the beam direction with an axis ratio of 1:0.7 is deduced. The sensitivity of the method is discussed in comparison with conventional fragment-fragment velocity correlations.
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