Isospin dependence of compound nuclear formation and decay
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1 Isospin dependence of compound nuclear formation and decay S.Pirrone (INFN Catania), J.P.Wieleczko (GANIL- Caen), M.La Commara (Univ.& INFN Napoli), A.Pagano (INFN-Catania), G.Politi (Univ. &INFN Catania) SPES LNL, November 2010 SPES 2010 Workshop & IV LEA-COLLIGA Meeting November 2010 INFN Laboratori Nazionali di Legnaro
2 ISODEC - Scientific Program S.Pirrone, Lea Colliga Meeting, Paris 2009 Stable Beams -E475S@GANIL, with INDRA (2007) -ISODEC@LNS, with CHIMERA (2010) Next Exotic Beams -Loi for SPES@LNL -Next proposal for SPIRAL2@GANIL LEA COLLIGA agreement J.P. Wieleczko et al., LOI for Lea GANIL-LNL 2007 E.Bonnet, Lea Colliga Meeting, LNS 2008
3 Physics Case and Context Experiment Experiment PRELIMINARY
4 Physics Case and Context Heavy ion collisions with stable and exotic beam Low energy regime E/A 15 MeV/A Fusion reaction mechanism the isospin dependence (N/Z) of the emission mechanism of complex fragments (Z 3) from CN, to extract information on: - level density parameter, (thermal properties, E*, m effective ) - fission barrier, ( Esym, congruence energy term) - viscosity, ( coupling collective intrinsic modes, Fermi level) the interplay between nuclear structure and reaction mechanism in the emission process, at different excitation energy for medium mass region
5 E475S E = 5.5 AMeV 78, 82 Kr + 40 Ca 118,122 Ba* (~ 100 MeV) 3 θ 44 IC-Si-CsI forward part Energy, angular distribution RP Charge distribution Cross section decay mode J.-P. Wieleczko et al., LOI for Lea GANIL-LNL 2007 J.-P. Wieleczko et al, proceedings of the FUSION08 international conference on New Aspects of Heavy Ion Collisions Near the Coulomb Barrier, sept. 2008, Chicago, USA E.Bonnet, Lea Colliga Meeting, LNS 2008 G.Ademard et al, IWM2009, Catania
6 N/Z effects σ measurement on σ measurement Inclusive data FF Δ even IMF IMF Z CN / 2 * odd CN neutron rich (o) 30% less fission (Z 14 ) Less even-odd staggering of IMF ( 6 Z 12 ) Even (odd) IMF are less (more) produced
7 Δ even * odd - Multistep Hauser-Feshbach model (code including emission up to Ca) The discrepancies with theoretical previsions show the need - Extended Hauser-Feshbach scission point model to include the N/Z dependence on the emission mechanism - Transition from CNState andmodel to get new constraining data - Dynamical Cluster Decay model
8 Coincidence α-ff Location peaks and slopes give us information on the shape and on the temperature of the emitting system Coincidence α-er Deconvolution gives information on E* sharing Level densitity Viscosity Dynamics of the process
9 Improving and Complementary Experiment : Higher energy Influence on the amplitude of the staggering. Influence on the temperature of the emitting system. Isotopic separation of IMF to investigate the staggering effects looking at the isotopic distribution of IMF. Exploration of a larger domain in N/Z of the system (stable beam!) to compare with theoretical model and to study the dependence from the N/Z on the mechanism of complex fragment emission from CN Exclusive measurements in a large angular range
10 ISODEC E = 10 AMeV 78, 86 Kr + 40,48 Ca 118, 134 Ba* (~ 250 MeV) Spokepersons: J.-P. Wieleczko (GANIL, Caen), S.Pirrone(INFN-Catania), M.La Commara (Univ. & INFN Napoli), G.Politi (Univ. & INFN-Catania) Isotopic distribution for 3 Z 10 (6-62 ) Energy, angular distribution RP Absolute cross sections for decay modes Relative velocity and angular correlation Coincidence ER-LCP, FF-LCP, IMF-LCP S.Pirrone, Lea Colliga Meeting, Paris 2009 January 2010
11 IMF Isotopic Identification PSD in Silicon ΔE-E, Si-CsI(Tl) 10 Be 9 Be n-rich n-poor PRELIMINARY
12 E =10 AMeV 92 Kr + 40,48 Ca 132, 140 Ba* (~320 MeV) Key Observables Isotopic distribution forimf 3 Z 12 E = 8 20 MeV/A 4 < θ < 30 Energy, angular distribution RP (FF-ER-IMF-LCP) FF - ER E > 2 MeV/A 4 < θ < 30 LCP E > 2 MeV/A 4 < θ < 170 Charge identification FF (Z < 30) ER (Z < 50) Cross sections for decay modes Multiplicity Relative velocity and angularcorrelation Coincidence ER-LCP, FF-LCP, IMF-LCP
13 Si 1 Charge Heavy Ion Mass and Energy Resolving Array CsI(Tl) 30 T CHIMERA Granularity 1192 telescopes Si (300µm) +CsI(Tl) Geometry RINGS: 688 telescopes cm SPHERE: 504 telescopes 40 cm CHIMERA@LNL Angular range Identification method Experimental observables and performances Detection threshold RINGS: 1 < θ < 30 SPHERE: 30 < θ < % of 4π Part of CHIMERA + E-E E-TOF PSD in CsI(Tl) PSD in Si (upgrade 2008) existing New detector TOF δt 1 ns δe/e LCP (Light Charge Particles) 2% δe/e HI (Heavy Ions) 1% Energy, Velocity, A, Z, angular distributions 1 MeV/A for H.I. 2 MeV/A for LCP
14 time resolution t 1ns
15 Conclusion ISODEC Scientific Program proposes to study the isospin dependence on CN formation and decay modes and the N/Z influence on some properties of nuclei : fission barriers, level density parameter, viscosity Obtained results by using stable suggest to extend and improve the measurements with exotic beams, to study nuclear fundamental properties in an exotic domain of the nuclear chart. CHIMERA@LNL CHIMERA + other detectors - New Arrays are proposed to realize the experiment. SPES@LNL will be a very suitable facility for this program
16 Participants G.Ademard(GANIL Caen), F.Amorini (INFN LNS and Univ. Catania), L.Auditore (INFN Gruppo coll. and Univ. Messina), C.Beck (IN2P3 - IPHC Strasbourg), E.Bonnet (GANIL Caen), G.Cardella (INFN Sez. Catania), M.Colonna (INFN- LNS), G.DeAngelis (INFN-LNL), E.DeFilippo (INFN Sez. Catania), A.D'Onofrio (INFN Sez. and Univ. Napoli), J.D.Frankland (GANIL Caen), E.Geraci (INFN Sez. and Univ. Catania), L.Grassi (INFN Sez. and Univ. Catania), E.Henry (Rochester Univ., USA), M.LaCommara (Università and INFN Sez. Napoli), E.LaGuidara (INFN Sez. Catania and CSFNSM), G.Lanzalone (INFN LNS and Univ. Kore Enna), P.Lautesse (IN2P3 - IPN Lyon), N.LeNeindre (IN2P3 - LPC Caen), I.Lombardo (INFN LNS and Univ. Catania), S.LoNigro (INFN Sez. and Univ. Catania), D. Loria ( INFN Gruppo coll. and Univ. Messina), A.Pagano (INFN- Sez. Catania), M.Papa (INFN - Sez. Catania), M.Parlog (IN2P3 - LPC Caen), E.Piaseki (Univ. of Warsaw), S.Pirrone (INFN Sez. Catania), G.Politi (Università and INFN Sez. Catania), F.Porto (INFN - LNS and Univ. Catania), M.Quinlann (Rochester Univ., USA), F.Rizzo (INFN - LNS and Univ. Catania), E.Rosato (INFN Sez. and Univ. Napoli), P.Russotto (INFN - LNS and Univ. Catania), W.U.Schroeder (Rochester Univ., USA), G.Spadaccini (INFN Sez. and Univ. Napoli), A.Trifirò (INFN Gruppo coll. and Univ. Messina), M.Trimarchi (INFN Gruppo coll. and Univ. Messina), J.Toke (Rochester Univ., USA), G.Verde (INFN -Sez. Catania), M.Vigilante (INFN Sez. and Univ. Napoli), J.P.Wieleczko (GANIL Caen).
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