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78Kr+40Ca and 86Kr+48Ca at 10A MeV

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Presentation on theme: "78Kr+40Ca and 86Kr+48Ca at 10A MeV"— Presentation transcript:

1 78Kr+40Ca and 86Kr+48Ca at 10A MeV
Decay competition for IMF produced in the collisions 78Kr+40Ca and 86Kr+48Ca at 10A MeV M. La Commara – EXOCHIM/ISODEC collaboration Dipartimento di Fisica - Università di Napoli “Federico II” I.N.F.N. - Sezione di Napoli

2 - results …. preliminary still! - conclusions (???)
M. La Commara outline - physics - experimental method - results …. preliminary still! - conclusions (???) - …temporary achievements (!)

3 Physics Experimental Method Results… preliminary still! Temporary achievements… M. La Commara Physics Main research topic: decay modes of CN with different N/Z ratios Why..? H.I. collisions with stable and radioactive beams are ideal to explore the response of nuclei under different extreme situations Low energy domain E < 15 A·MeV is dominated by fusion processes that can be very complex and largely affected by several key factors: structure, angular momentum, dynamical effects, and N/Z of the compound system 3

4 - the level-density parameter is related to the effective mass, a
Physics Experimental Method Results… preliminary still! Temporary achievements… M. La Commara N/Z degree of freedom is expected to play a crucial role on decay path, since: - the level-density parameter is related to the effective mass, a property of the effective nucleon-nucleon interaction that is sensitive to the neutron-proton composition of the nuclei - the fission barriers depend strongly on the symmetry energy, i.e. on the isospin asymmetry contribution The competition among CN decay modes ruled by fundamental properties as level density, fission barriers, nuclear viscosity we focus in particular on light Ba-isotopes decay which leads towards residues lying in proximity of 100Sn … 4

5 J. Gómez del Campo et al., PRC 57 (1998) R457
MLC et al., NPA 669 (2000) 43 58Ni+50Cr and 5 A·MeV Ba * (E*=250 MeV) IMF (3≤Z≤20) emission 120La 121La 122La 114Ba 115Ba 116Ba 117Ba 118Ba 119Ba 120Ba 121Ba 112Cs 113Cs 114Cs 115Cs 116Cs 117Cs 118Cs 119Cs 120Cs 110Xe 111Xe 112Xe 113Xe 114Xe 115Xe 116Xe 117Xe 118Xe 119Xe 108I 109I 110I 111I 112I 113I 114I 115I 116I 117I 118I 107Te 108Te 109Te 110Te 111Te 112Te 113Te 114Te 115Te 116Te 117Te 135Ba 134Ba 133Ba 104Sb 105Sb 106Sb 107Sb 108Sb 109Sb 110Sb 111Sb 112Sb 113Sb 114Sb 115Sb 116Sb 117Sb 118Sb 100Sn 101Sn 102Sn 103Sn 104Sn 105Sn 106Sn 107Sn 108Sn 109Sn 110Sn 111Sn 112Sn 113Sn 114Sn 115Sn 116Sn 117Sn 100In 101In 102In 103In 104In 105In 106In 107In 108In 109In 110In 111In 112In 113In 114In 115In 116In 99Cd 100Cd 101Cd 102Cd 103Cd 104Cd 105Cd 106Cd 107Cd 108Cd 109Cd 110Cd 111Cd 112Cd 113Cd 114Cd 115Cd 98Ag 99Ag 100Ag 101Ag 102Ag 103Ag 104Ag 105Ag 106Ag 107Ag 108Ag 109Ag 110Ag 111Ag 112Ag 113Ag 114Ag 97Pd 98Pd 99Pd 100Pd 101Pd 102Pd 103Pd 104Pd 105Pd 106Pd 107Pd 108Pd 109Pd 110Pd 111Pd 112Pd 113Pd evaporation-residues populating zones 5

6 Example: study of the system 78,82Kr + 40Ca at 5.5 MeV/A
Physics Experimental Method Results… preliminary still! Temporary achievements… M. La Commara Example: study of the system 78,82Kr + 40Ca at 5.5 MeV/A The ER cross-section and fission like component are higher for neutron poor system strong odd-even staggering in fragment yields, dependent on N/Z ratio of the system more comparison with models shows signals of a competition between fusion-fission and quasi-fission processes G. Ademard et al. PRC 83 (2011) 6

7 78,86Kr + 40,48Ca 118,134Ba* ELab= 10 A·MeV E* ≈ 250 MeV
Physics Experimental Method Results… preliminary still! Temporary achievements… M. La Commara ISODEC experiment proposed by an international collaboration, in the framework of the LEA-Colliga (GANIL,LNS,LNL), spokes J.P. Wieleczko GANIL, S. Pirrone INFN-Ct M.L.C. Univ. & INFN-Na, G. Politi Univ. & INFN-Ct 78,86Kr + 40,48Ca ,134Ba* ELab= 10 A·MeV E* ≈ 250 MeV - Energy influence on staggering effect - Temperature influence on decay mechanism - Larger domain of N/Z S. Pirrone et al., Proc. of FUSION11, EPJ Web of Conf. 17, (2011) G. Politi et al., Proc. of CNR11 EPJ Web of Conf. 21, (2012) M.L.C. et al., Proc. of IWM2011, EPJ Web of Conf. 11, (2012) S. Pirrone et al.,Proc of ICRTNP2012, AIP Conf. Proc. 1524, 7-10 (2013) Larger N/Z domain allows the study of its influence on formation and decay of compound nuclei ! 7

8 Physics Experimental method Results… preliminary still! Temporary achievements… M. La Commara The Physics The Experimental Method Results… preliminary still! Temporary achievements… M. La Commara Experimental Method Two systems with different characteristics, studied at the INFN - LNS Catania systems well above Coulomb barrier formation of compound nuclei with evaporation/fission quasi fission processes 78Kr + 40Ca Ba 86Kr + 48Ca Ba E*(MeV) 215 270 VB(MeV) 90 87 ECM/VB 2.9 3.5 (N/Z)tot 1.11 1.39

9 Experimental observables - Detection of FF-ER, IMF, LCP
Physics Experimental Method Results… preliminary still! Temporary achievements… M. La Commara The Physics The Experimental Method Results… preliminary still! Temporary achievements… M. La Commara Experimental observables - Detection of FF-ER, IMF, LCP - Fragment Isotopic Distribution 3 < Z < 12 E = 8÷20 MeV/A 4° < q < 30° - Charge identification of FF (Z < 25) Tagging of ER (Z < 50) - Energy spectra and angular distribution of reaction products FF - ER E > 2 MeV/A 4° < q < 30° LCP E > 2 MeV/A 4° < q < 170° - Absolute cross section of different decay modes - Relative velocity and angular correlation -> time scale - Coincidence between ER-LCP, FF-LCP, IMF-LCP for reaction mechanism characterization

10 Experiment performed at INFN-LNS in Catania – ITALY
Physics Experimental Method Results… preliminary still! Temporary achievements… M. La Commara The Physics The Experimental Method Results… preliminary still! Temporary achievements… M. La Commara Experiment performed at INFN-LNS in Catania – ITALY Beams of 78,86Kr delivered by Superconducting Cyclotron (i ~ 1 nA) impinging on 1 mg/cm2 40,48Ca targets realized by INFN-LNL target service

11 CHIMERA device at INFN-LNS in Catania – ITALY 4p device
Physics Experimental Method Results… preliminary still! Temporary achievements… M. La Commara CHIMERA device at INFN-LNS in Catania – ITALY 4p device 1192 Telescopes Si (300mm) - CsI(Tl)/PD Forward part 1°<Q<30° 688 modules 9 Rings 100<d<350 cm Backward part 30°<Q<176° 504 modules Sphere R=40 cm Precise measurement of E, TOF, Velocity, q/f Dedicated electronics and data acquisition for low threshold (~MeV) and high dynamical range cf Giuseppe Cardella talk, given on tuesday, this hall. A. Pagano et al., NPA 734 (2004) 504 target beam

12 Pulse Shape Discrimination is fundamental in this energy domain
Physics Experimental Method Results… preliminary still! Temporary achievements… M. La Commara Pulse Shape Discrimination is fundamental in this energy domain for the two stage telescope of CHIMERA Example of charge identification of reaction products DE-E PSD

13 Physics Experimental Method Results… preliminary still! Temporary achievements… M. La Commara The Physics The Experimental Method Results… preliminary still! Temporary achievements… M. La Commara

14 The IMF yield exhibits a strong odd-even staggering, that is
Physics Experimental Method Results… preliminary still! Temporary achievements… M. La Commara The Physics The Experimental Method Results… preliminary still! Temporary achievements… M. La Commara Charge Yield for IMF (3 < Z < 12) of n-poor and n-rich, =10°-13° The IMF yield exhibits a strong odd-even staggering, that is more pronounced for the n-poor system G.Casini et al. , PRC 86,011602R, 2012 n-rich n-poor

15 calculations in progress: J. P. Wieleczko (DNS code)
Physics Experimental Method Results… preliminary still! Temporary achievements… M. La Commara calculations in progress: J. P. Wieleczko (DNS code) n poor n rich

16 78Kr + 40Ca <energy> (MeV) q lab (°) Physics Experimental Method
Results… preliminary still! Temporary achievements… M. La Commara 78Kr + 40Ca <energy> (MeV) q lab (°)

17 86Kr + 48Ca <energy> (MeV) q lab (°) Physics Experimental Method
Results… preliminary still! Temporary achievements… M. La Commara 86Kr + 48Ca <energy> (MeV) q lab (°)

18 dashed lines = 78Kr + 40Ca solid lines = 86Kr + 48Ca A=14 A=15 A=13
Physics Experimental Method Results… preliminary still! Temporary achievements… M. La Commara dashed lines = 78Kr + 40Ca solid lines = 86Kr + 48Ca A=14 A=15 A=13 A=14 A=12 A=13 A=11 A=12 A=10 A=11

19 Temporary achievements…
Physics Experimental Method Results… preliminary still! Temporary achievements… M. La Commara Temporary achievements… Experiment performed at LNS to study isospin effects on composite system formation and decay modes Experimental observables and reaction product features -> CHIMERA device with optimization at lower energy Odd/even effects present in fragment yields, with different amplitude according to N/Z of the system Energy averaged distribution with angle for light Z isotopes

20 absolute cross sections evaluation
Physics Experimental Method Results… preliminary still! Temporary achievements… M. La Commara work is processing…. next goal is: absolute cross sections evaluation comparisons with theoretical model predictions to provide relevant indications on the isospin influence on the reaction mechanism and fragments production Possible extension to higher value of N/Z use of radioactive beams SPES2010 INFN-LNL, Kr, Sr, Sn + Ca, Ni - large range of N/Z in entrance channel and compound nuclei: Kr E/A = 12 MeV 56Ni+58Ni, Einc ≈ 300 MeV ( 114Ba*)

21 EXOCHIM – ISODEC collaboration
M.L.C.1,2, S. Pirrone3, G. Politi3,4, J. P. Wieleczko5, G. Ademard5, E. De Filippo3, M. Vigilante1,2, F. Amorini6, L. Auditore7,8, C. Beck9, I. Berceanu10, E. Bonnet5, B. Borderie11, G. Cardella3, A. Chbihi5, M. Colonna6, A. D’Onofrio2,12, J. D. Frankland5, E. Geraci3,4, E. Henry13, E. La Guidara3,14, G. Lanzalone15,6, P. Lautesse16, D. Lebhertz5, N. Le Neindre17, I. Lombardo1,2, D. Loria7,8, K. Mazurek5, A. Pagano3, M. Papa3, E. Piasecki18, F. Porto4,6, M. Quinlann13, F. Rizzo4,6, E. Rosato1,2, P. Russotto4,6, W. U. Schroeder13, G. Spadaccini1,2, A. Trifirò7,8, J. Toke13, M. Trimarchi7,8, G. Verde3 1) Dipartimento di Fisica, Università Federico II Napoli, Italy 2) INFN - Napoli, Italy 3) INFN - Catania, Italy 4) Dipartimento di Fisica e Astronomia, Università di Catania, Italy 5) GANIL - Caen, France 6) INFN LNS - Catania, Italy 7) Dipartimento di Fisica, Università di Messina, Italy 8) INFN Gruppo Collegato di Messina, Italy 9) IN2P3 - IPHC Strasbourg, France 10) IPNE, Bucharest, Romania 11) IN2P3 - IPN Orsay, France 12) Dipartimento di Matematica e Fisica, SUN, Caserta, Italy 13) University of Rochester, USA 14) Centro Siciliano Fisica Nucleare e Struttura della Materia, Catania, Italy 15) Università Kore, Enna, Italy 16) IN2P3 - IPN Lyon, France 17) IN2P3 - LPC Caen, France 18) University of Warsaw, Poland

22 Thanks ! Thank you !

23

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