Estimate of average freeze-out volume in multifragmentation events.pdf

Estimate of average freeze-out volume in multifragmentation events.pdf

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Estimate of average freeze-out volume in multifragmentation events

a r X i v : n u c l - e x / 0 5 0 9 0 1 0 v 1 5 S e p 2 0 0 5 Estimate of average freeze-out volume in multifragmentation events S. Piantelli a,b,1, N. Le Neindre a, E. Bonnet a, B. Borderie a, G. Lanzalone a,c, M. Parlog d, M. F. Rivet a, R. Bougault e, A. Chbihi f, R. Dayras g, D. Durand e, J. D. Frankland f, E. Galichet a,h, D. Guinet i, P. Lautesse i, O. Lopez e, E. Rosato j, B. Tamain e, E. Vient e, M. Vigilante j, C. Volant g and J. P. Wieleczko f, INDRA Collaboration aInstitut de Physique Nucle?aire, IN2P3-CNRS, F-91406 Orsay Cedex, France bDip. di Fisica e Sezione INFN, Universita? di Firenze, I-50019 Sesto Fiorentino (Fi), Italy cINFN, Laboratori Nazionali del Sud and Dipartimento di Fisica e Astronomia, via S. Sofia 44, I-95123 Catania, Italy dNational Institute for Physics and Nuclear Engineering, RO-76900 Bucharest-Magurele, Romania eLPC Caen, IN2P3-CNRS/ENSICAEN et Universite?, F-14050 Caen Cedex, France fGANIL, CEA et IN2P3-CNRS, B.P. 55027, F-14076 Caen Cedex 5, France gDAPNIA/SPhN, CEA/Saclay, F-91191 Gif sur Yvette, France hConservatoire National des Arts et Me?tiers , F-75141 Paris Cedex 03, France iInstitut de Physique Nucle?aire, IN2P3-CNRS et Universite?, F-69622 Villeurbanne Cedex, France jDipartimento di Scienze Fisiche e Sezione INFN, Universita? di Napoli “Federico II”, I-80126 Napoli, Italy Abstract An estimate of the average freeze-out volume for multifragmentation events is pre- sented. Values of volumes are obtained by means of a simulation using the exper- imental charged product partitions measured by the 4π multidetector INDRA for 129Xe central collisions on natSn at 32 AMeV incident energy. The input parameters of the simulation are tuned by means of the comparison between the experimental and simulated velocity (or energy) spectra of particles and fragments. Preprint submitted to Elsevier Science 8 February 2008 Key words: Multifragmentation, central collisions, freeze-out volume PACS: 25.70.-z, 25.70.Pq A better knowledge of m

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