1. PRISMA-FIDES 2013-2016 Heavy-ion reactions from grazing collisions to complete fusion G.Montagnoli (100%), D.Montanari (100%), F.Scarlassara (50%) (Univ. and INFN - Padova) 2.5 FTE A.M. Stefanini (100%), L. Corradi (80%), E.Fioretto (100%), Huiming Jia (100%) (INFN - LNL) 3.8 FTE G.Pollarolo (50%) (Univ. and INFN – Torino) 0.5 FTE G.Montagnoli (100%), D.Montanari (100%), F.Scarlassara (50%) (Univ. and INFN - Padova) 2.5 FTE A.M. Stefanini (100%), L. Corradi (80%), E.Fioretto (100%), Huiming Jia (100%) (INFN - LNL) 3.8 FTE G.Pollarolo (50%) (Univ. and INFN – Torino) 0.5 FTE July 2012 Joint work with the experiments EXOTIC and GAMMA Collaboration with GSI (D.Ackermann), Zagreb (S.Szilner,T.Mijatovic), Dubna (N.Kondratiev, R.Sagaidak), Strasbourg (F.Haas, S.Courtin), Cracow (J.Grebosz) Joint work with the experiments EXOTIC and GAMMA Collaboration with GSI (D.Ackermann), Zagreb (S.Szilner,T.Mijatovic), Dubna (N.Kondratiev, R.Sagaidak), Strasbourg (F.Haas, S.Courtin), Cracow (J.Grebosz) 6.8 FTE overall

2. The PRISMA 2 experiment at LNL Traditionally, our group has always been involved in 2 lines of research: HI fusion reactions around V B presently focused at E << V B using the electrostatic beam separator PISOLO 2-body reactions pair transfer enhancement (transfer coupling to fusion n-rich isotope production....) using the magnetic spectrometer PRISMA

3. Heavy-ion reactions from grazing collisions to complete fusion: recent experiments on sub-barrier transfer and on fusion hindrance at very low energies The AGATA demonstrator: nuclear structure of n-rich nuclei identified with PRISMA. At LNL until end of 2011. A small array of LaBr 3 :Ce detectors. Heavy beams at LNL (Tandem, ALPI, PIAVE) and complementary experiments at other facilities (GANIL, ANL) Heavy-ion reactions from grazing collisions to complete fusion: recent experiments on sub-barrier transfer and on fusion hindrance at very low energies The AGATA demonstrator: nuclear structure of n-rich nuclei identified with PRISMA. At LNL until end of 2011. A small array of LaBr 3 :Ce detectors. Heavy beams at LNL (Tandem, ALPI, PIAVE) and complementary experiments at other facilities (GANIL, ANL) PRISMA-2

4. PRISMA beam direction 20 o 96 Zr 40 Ca Detection of (light) target like ions in inverse kinematics with PRISMA Nucleon transfer channels have been measured down to 25 % below the Coulomb barrier Prisma acceptance

5. +1n well reproduced by theory in slope and absolute value Same slope of +2n between theory and experiment +1n well reproduced by theory in slope and absolute value Same slope of +2n between theory and experiment L. Corradi et al., Phys. Rev. C 84, 034603 (2011) +2n enhancement due to the presence of other excited states? Absorption reproduced by theory 2n transfer to g.s. 2n transfer to 0 + (5,76MeV) (2n in p 3/2 ) Sub-barrier transfer for 96 Zr (beam) + 40 Ca

6. Slopes for 116 Sn + 60 Ni The experiment 116 Sn + 60 Ni (Feb. 2012) PRELIMINARY +1n and +2n slopes are in agreement with those expected from binding energies Preliminary data Data under analysis Preliminary data Data under analysis P1P1 P 2 3(P 1 ) 2

7. LNL results on 58 Ni + 54 Fe E c.m. (MeV) Log slope S-factor Fus. x-sects. A.M.Stefanini et al., PR C81, 037601 (2010)

8. Recent measurements on 40 Ca+ 40 Ca, 40 Ca+ 48 Ca and 48 Ca+ 48 Ca have investigated fusion hindrance and nuclear structure effects at sub-barrier energies (Fusion-evaporation residues detected using the electrostatic beam deflector at LNL) G.Montagnoli et al., PRC 85, 024607 (2012) C.L.Jiang et al., PRC 82, 041601(R) (2010) A.M.Stefanini et al., PLB 679, 95 (2009)

9. Our recent results on 32 S + 48 Ca the logarithmic derivative is rather low and keeps increasing below the barrier the barrier distribution is very wide and shows an unusual shape by coupling schematically a Q>0 transfer channel, the data are well fit

10. Study of nucleon-nucleon correlations (particle-vibration couplings, pairing vibrations, sub-barrier transfer) in binary reactions near the barrier Couplings effects and fusion hindrance far below the barrier – fusion cross sections in light heavy-ion systems Prisma: a second TOF arm for kinematic coincidences, a new PPAC for light heavy-ions, better tracking of ion trajectories for higher A resolutionDevelopments for Prisma: the new scattering chamber with a second TOF arm for kinematic coincidences, a new PPAC for light heavy-ions, better tracking of ion trajectories for higher A resolution Test of γ-particle coincidences in Galileo and of the EXOTIC set-up for very low fusion x-sects. measurements All this will allow us to use the future exotic SPES beams with great efficiency Study of nucleon-nucleon correlations (particle-vibration couplings, pairing vibrations, sub-barrier transfer) in binary reactions near the barrier Couplings effects and fusion hindrance far below the barrier – fusion cross sections in light heavy-ion systems Prisma: a second TOF arm for kinematic coincidences, a new PPAC for light heavy-ions, better tracking of ion trajectories for higher A resolutionDevelopments for Prisma: the new scattering chamber with a second TOF arm for kinematic coincidences, a new PPAC for light heavy-ions, better tracking of ion trajectories for higher A resolution Test of γ-particle coincidences in Galileo and of the EXOTIC set-up for very low fusion x-sects. measurements All this will allow us to use the future exotic SPES beams with great efficiency PRISMA-FIDES

11. Detection of coincident fragments (MCP,TOF,DE-E) beam PRISMA Via high resolution kinematic coincidence we can also deduce the fission probability of associated heavy partners, determined as function of Z,A (light partner) and Q-value of the reaction Light partner : high Z,A resolution Heavy partner : low Z,A resolution L.Corradi et al, Phys.Rev.C66(2002)024606

12. Astrophysical S factors for several systems measured in the last few years

13. Measurements of very low fusion cross sections need high efficiency and low background. Tests using the EXOTIC line and - particle coincidences with GALILEO are being considered Fusion of medium-light systems

14. Spese ordinarie

15. II braccio Prisma (coinc. cinem.) Coinc. γ-particelle (in Galileo) Miglior. tracking Investimenti

16. Previsioni di spesa 2013 - PD Inventariabile: 56 k Consumo: 26 k Missioni estere: 6 k Missioni interne: 5 k TOTALE : 93 k (per tutta la collaborazione circa 189 k)

17. Richieste ai servizi LNL per il 2013 ServizioLavoro richiestoTempo (mesi uomo) Officina meccanicaCompletamento camera sliding seal, installazione e allineamenti Installazione II braccio 6 1 Servizio Utenti (Supporto App. Sperim.) Sviluppo, install. e collaudo del controllo PLC del vuoto Pisolo Upgrading controllo x II braccio 3 1 Richieste ai servizi Padova per il 2013 ServizioLavoro richiestoTempo (mesi uomo) Ufficio Tecnico2 flangie di adattamento Sliding seal per secondo braccio e alloggiamento rivelatori γ LaBr 3 2 Officina MeccanicaCompletamento camera sliding seal, installazione e allineamenti 6 Laboratorio ElettronicaOttimizzazione fast ampl. + HV per i due PPAC 2

18. Sliding-seal scattering chamber Beam line Prisma Secondo Braccio Target

19. End

20. 1/23/2014 PAC-meeting 2008 20 Electrostatic separator and E-ToF telescope to detect Electrostatic separator and E-ΔE-ToF telescope to detect evaporation residues at O o evaporation residues at O o beam E-ΔE-ToF telescope detecting ER MCP, IC & Si detectors scattering chamber + + _ _ HV target

21. Very different behaviors

22. Milestones PRISMA-2 2011-2012 1) July 31, 2011 to conclude the experimental campaign of PRISMA- AGATA measurements AGATA stayed at LNL until December 2011- milestone reached 100% 2) December 15, 2011 to organize a measurement of sub-barrier transfer reactions involving superfluid nuclei milestone reached 100% 3) June 30, 2012 to perform the sub-barrier fusion experiment on Ca+Zr systems milestone reached 80% 4) June 30, 2012 to complete the installation of the new scattering chamber for PRISMA milestone reached 30% 5) June 30, 2012 to define the scientific program using PRISMA and Pisolo spectrometers for the next few years milestone reached 100% 6) December 30, 2012 to complete the R&D studies of PRISMA upgradings for the next few years

23. Milestones PRISMA-FIDES 2013 1) July 31, 2013 to extend the sub-barrier fusion experiments to medium-light systems 1) July 31, 2013 to study sub-barrier transfer in 92 Mo+ 54 Fe or in another proton-rich system 2).Sep. 30, 2013 to install and test the new gas pumping and vacuum control of PISOLO 1) Dec. 20, 2013 to measure nucleon transfer channels in Ca+Ca systems 1) Dec. 20, 2013 to complete the tests of new detectors and DAQ upgrading for the second arm of PRISMA

24. New sliding seal scattering chamber New large angle «coincidence arm» EFB MCP + PPAC + IC?

25. Sub-barrier transfer for 96 Zr (beam) + 40 Ca L.Corradi et al., Phys. Rev. C84, 034603 (2011)