Isospin diffusion in semi-peripheral $^{58}Ni$+$^{197}Au$ collisions at intermediate energies (I): Experimental results

E. Galichet (1, 2) , M. F. Rivet (1) , B. Borderie (1) , M. Colonna (3) , R. Bougault (4) , A. Chbihi (5) , R. Dayras (6) , D. Dominique Durand (4) , J.D. Frankland (5) , D. C. R. Guinet (7) , P. Lautesse (7) , N. Le Neindre (1) , O. Lopez (4) , L. Manduci (4) , M. Pârlog (8) , E. Rosato (9) , B. Tamain (4) , E. Vient (4) , C. Volant (6) , J.P. Wieleczko (5)

1 IPNO - Institut de Physique Nucléaire d'Orsay
2 CNAM - Conservatoire National des Arts et Métiers [CNAM]
3 LNS - Laboratori Nazionali del Sud
4 LPCC - Laboratoire de physique corpusculaire de Caen
5 GANIL - Grand Accélérateur National d'Ions Lourds
6 DPHN - Département de Physique Nucléaire (ex SPhN)
7 IPNL - Institut de Physique Nucléaire de Lyon
8 NIPNE - Horia Hulubei National Institute of Physics and Nuclear Engineering
9 INFN, Sezione di Napoli - Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

Isospin diffusion in semi-peripheral collisions is probed as a function of the dissipated energy by studying two systems $^{58}Ni$+$^{58}Ni$ and $^{58}Ni$+$^{197}Au$, over the incident energy range 52-74\AM. A close examination of the multiplicities of light products in the forward part of phase space clearly shows an influence of the isospin of the target on the neutron richness of these products. A progressive isospin diffusion is observed when collisions become more central, in connection with the interaction time.

Domains: Nuclear Experiment [nucl-ex]

E. Galichet, M. F. Rivet, B. Borderie, M. Colonna, R. Bougault, et al.. Isospin diffusion in semi-peripheral $^{58}Ni$+$^{197}Au$ collisions at intermediate energies (I): Experimental results. Physical Review C, 2009, 79, pp.064614. ⟨10.1103/PhysRevC.79.064614⟩. ⟨hal-00347268⟩