Isospin Equilibration Processes and dipolar degree of Freedom 12 C+ 64 Ni 8 Be(2α)+ 72 Ge * 8 MeV/A Incomplete fusion-FastTransfer of isoscalar particles.

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Presentation transcript:

Isospin Equilibration Processes and dipolar degree of Freedom 12 C+ 64 Ni 8 Be(2α)+ 72 Ge * 8 MeV/A Incomplete fusion-FastTransfer of isoscalar particles on charge/mass asymmetric target 40 Ca+ 48 Ca - 40 Ca+ 46 Ti 25 MeV/A CoMD calculations Time Dependence (coherent dynamical)+ Uncoherent(GDR statistical)+Brehmstralung+ H.R Incomplete fusion-fusion c.hNot c.h M.Papa and Exochim collaboration

40 Ca+ 48 Ca 45 MeV/A γ-ray Emission and Symmtery potential Φ ch as a function of the γ-ray energy – GDR properties of hot fragments produced at ρ<ρ 0

Deep Inelastic- 40 Ca+ 48 Ca 10 MeV/A -Is an invariant observable with respect to statistical emission processes and with respect clusterization procedure -It does not depend in a direct way from the neutron yield t eq

Isospin equilibration processes at Fermi energies and the Chimera multi-detector Charged particles V1,N1/Z1 V2,N2/Z2 V3,N3/Z3 Light partic les N tot /A tot Global Evolution γ Global evolution of a hot compressed, isolated, source of nuclear matter.: After t eq, will stay constant forever Its measurable value is determined from the dynamics at short time t ρ 0 )-Dependence from different options describing U τ Isospin equilibration condition in Multi-fragmentation processes M.Papa and G.Giuliani. Submitted to Phys.Rev. C =0 No relative motion between C.M. of neutral matter and C.M. of charged matter Diff. FlowDistill.-Migration Limiting experiment (fusion-incompl fusion processes) the analysis is in progress

Choice of the system Relatively light systemInv. And Dir. kinematics Proj. and Targ. With different char/mass asymmetries E lab /A around 40 MeV/A 48 Ca+ 27 Al 40 MeV/A Favourable conditions for a good event reconstruction 85-90% charge and momentum A B C A- Region dominated by two-body collision effects C –Region in which less prounced changes of ρ are produced for t<t eq B- Region of high sensitivity

Simulations Ө lab INV. DIR. Big 1 Big 2 L.C.P Big 3 Z-V Z lab b=4 fmAng.-Distr.

Reaction mechanism selection 1 2 Preferred zones b<~5.5 fm or 1 and not 2 b~3-5.5 fm 1

b=6 fmb=5 fmb=4 fm b=3 fmb=2 fmb=1 fm m Z=1,2 – E tra /M Geometrical prescription V z exp.,I = V z th.,I - V z off.,I V z exp.,d = V z th.,d - V z off.,d V z exp.,d + V z exp.,i =- V z off.,I - V z off.,d ≈-k |V z off.,i | J.Lukasik et al. Phys.ReV.C 55 (1997) 1906 and reference therein. Inv.-Dir. Kinematics-Offset V z th.,I =- V z th.,d

Beam time Request Target 27 Al ≈250μg/cm 2 i≈100pa (Z * =15) good timing (FWHM less 1 nsec)

Ө lab INV. DIR. Big 1 Big 2 L.C.P Big 3

OFF-SET

LIMITING experiment: 40 Ca+ 40,48 Ca, 46 Ti E inc =25 MeV/nucleon SystemCutV z (c)V z (c)(no protons) 40 Ca+ 40 Ca10<A 2 < Ca+ 46 Ti10<A 2 < Ca+ 48 Ca10<A 2 < SystemCutV z (c)V z (c)(no protons) 40 Ca+ 40 CaA 2 < Ca+ 46 TiA 2 < Ca+ 48 CaA 2 < Preliminary results for the 40 Ca+ 48 Ca system: