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Nuclear structure and reactions @IN2P3 Selected Higlights

Nuclear structure and reactions @IN2P3 Selected Higlights. Shell evolution and nuclear interactions Reactions with weakly bound nuclei Nuclear Astrophysics Heavy and SHE Nuclear symetries Fundamental interactions Nuclear collisions / phase transition. Shell evolutions and NN interactions.

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Nuclear structure and reactions @IN2P3 Selected Higlights

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  1. Nuclear structure and reactions @IN2P3Selected Higlights Shell evolution and nuclear interactions Reactions with weakly bound nuclei Nuclear Astrophysics Heavy and SHE Nuclear symetries Fundamental interactions Nuclear collisions / phase transition

  2. Shell evolutions and NN interactions • Disappearence of the N=28 shell closure • N~16 shell gap and the location of continuum • Neutron proton interactions in 92Pd • Two proton radioactivity • Physics/status @ ALTO

  3. Collapse of the N=28 shell closure N=20 N=28 Ca,Z=20 40Ca 48Ca 44Ar 46Ar 48Ar S, Z=16 44S 43S 36S Si, Z=14 42Si 34Si 0+2 0+1 1365 keV e- conv 44S Ca e+ e- -Use of complementary experimental techniques (transfer, in-beam, isomer decay, coulex, deep inelastic) -Progressive collapse of N=28 shell closure: E(2+) Si Ee- (keV) -Various structures observed (triaxial, prolate, coexistence) -Interpret this in term of nuclear forces (spin orbit, tensor) S 42Si 5 Physical Review Letters, 1 Physical Review C 1 TOP 1% , 1TOP 10% most quoted papers (GANIL, IPNO, LPC Caen, IPHC Strasb)

  4. Evolution of shell gaps using (d,p) and (d,t) with 20O and 26Ne beams at SPIRAL TIARA-MUST2-EXOGAM-VAMOS COLLABORATION Exogam SPIRAL1 beams 4 MUST2 Position sensitive Si Barrel Hyball annular detectors O 5 fp states ? d3/2 Preliminary B. Fernandez d3d3 Location of the unbound d3/2 orbit 0 Th. Neutron SPE (MeV) (d,p) 3/2+ (3/2+) 16 s1/2 s1s1 Sn d5/2 14 20O -5 d5d5 (d,t) 8 Energy [MeV] 10 5 20 15 Neutron Number UK labs + IPN Orsay, GANIL, LPC Caen from IN2P3

  5. 92Pd spectroscopy using EXOGAM-Nwall-DIAMANT • EXOGAM: 11 Clovers with partial shield. eg ~ 10% for Eg=1.3 MeV • DIAMANT: 80 CsI(Tl) dets. ep or a~ 66% • The Neutron Wall: 50 liquidscintillator detectors. e1n ~ 23%

  6. 92Pd:A new spin aligned np coupling scheme B. Cederkall et al. Nature (2010) Spin-aligned pairing Normal pairing J=0 J=9 J=9 J=0 J=9 J=9 2536 8+ 2530 (6+ ) 6+ 2099 4+ 1786 (4+ ) 1415 2+ 874 (2+ ) 0 0 0+ 0+ 92Pd, exp. 96Pd exp G. De France, GANIL co-spokesperson 96 92 Pd Pd 46 46 46 50 92Pd

  7. Two proton radioactivity: 45Fe, 54Zn 45Fe (2p) CENBG TPC Experiment Theory Theory • Angular and energy distributions agree with Grigorenko model 3 body decay Experiment Collaboration IN2P3: CENBG, GANIL angle Future plans @ GSI

  8. Production of 5. 1011 f/s by photofission of 238UCx 3 dedicated lines : BEDO (beta-decay), SPECOLOR (colinear spectroscopy) and POLAREX (polarized states) Laser ion source already in operation for Ga and Cu BEDO Specolor ALTO @ Orsay increase of intensity coming soon Achievements published so far: Beta-decay spectroscopy of N~50 nuclei (D. Verney IPNO)

  9. Reactions with weakly bound nuclei • Fusion with 6,8He • Nuclear break up with 6He

  10. 6He n n 6He+65Cu reaction -> g, neutrons Enhancement of pair transfer Favour a di-neutron configuration a Neutron transfer dominates Fusion of 8He comparable to 6He ! n 8He n a Lemasson, Alahari et al. PRL 103, 232701 (2009) Neutron correlations, quantum tunneling in weakly bound nuclei Chatterjee, Navin et al. PRL 101, 032701 (2008) Di-neutron config. also in Nuclear break-up of 6He (Assié, Scarpaci IPNO, D. Lacroix GANIL)

  11. Nuclear astrophysics • Study of 13C(a,n) for AGB stars • Study of 18F destruction in novae • Study of 60Fe destruction in supernovae • Incompressibility of nuclear matter with N/Z ratio

  12. Nuclear Astrophysics Collaboration IPNO/CSNSM/GANIL 1/2+ • 13C(,n)16O source of neutrons for s process in AGB stars • Studied at OrsayTANDEM using 13C(7Li,t)17O Orsay 3/2+ M.G. Pellegriti, F. Hammache et al. PRC 70 (2008) 042801 • 18F main source of g radiation in novae • Destroyed mainly by 18F(p,g)19Ne reaction • Studied by 19Ne(p,p’)18F(p) at LLN Drotleff 93  Brune 93 Gamow peak new JC Dalouzy, de Oliveira et al. PRL 102 (2009) 162503 18F(p,g)19Ne Np 61Fe • 60Fe cosmic ray emittor possibly detected by INTEGRAL • Destroyed mainly by 60Fe(n,g)61Fe reaction • Studied by 60Fe(d,p)61Fe at GANIL ½+ S. Giron, F. Hammache, N. de Séréville preliminary E*

  13. Isospin dependence of the nuclear matter incompressibility Study of giant monopole mode in 56Ni and 68Ni ds 56Ni (5.104pps) @50A.MeV Interaction with d gas in MAYA dW E*= 13-15MeV [mb/sr] L=2 E*= 21-23MeV L=0 Linked to nuclear matter incompressibility K∞ Determine its value while increasing isospin value… qCM (deg) C. Monrozeau, E. Khan (IPN Orsay) Phys. Rev. Lett. 100, 042501 (2008)

  14. Heavy and superheavy elements • Study of Nb, Fm nuclei • The cluster structure of 212Po • Probing Z=120 ‘stability’ from fission times

  15. Spectroscopy of SHE 256Rf 253No 246Fm J. Piot (CSNSM) et al 246Fm 253No,256Rf: K isomers @ Dubna, ANL 246Fm,254No: Fission barrier and dynamics @ JYFL, ANL CSNSM Orsay, IPHC Strasb from IN2P3

  16. Manifestation of a clustering in 212Po Doppler shifted lines TE1< 1ps stopping time 35° A. Astier et al. PRL 104 (2010)042701 148° Enhanced E1 transitions interpreted as oscillatory motion of the a-core distance in 208Pb Collab: CSNSM, IPNO VIVITRON + EUROGAM

  17. cmin  0.2  treac > 10-18 s 1.2 1 0.8 0.6 Fusion-Fission 0.4 0.2 0 1.2 U sequential fission+ …….. 1 0.8 Normalized Yield 0.6 0.4 0.2 0 Quasi-elastic (target) 1.2 1 0.8 0.6 0.4 0.2 0 0 0.2 0.4 0.6 0.8 Y (deg) Blocking technique: evidence for long times at Z=120 treac < tmin(thermal vibrations)  cmin  0.1 tmin 10-18 s INDRA, Collab: IPNO, GANIL, IPNL

  18. Lifetime of SHE nucleus (Z=120) from X rays detection X rays from Z=120 seems to be observed Would be compatible with ‘long’ fission times > 10-18s Highest Z values come from fission of compound Z=120 nucleus PRELIMINARY D. Jacquet (IPNO), M. Morjean (GANIL) et al.

  19. Symmetries in nuclei • Phase transition in A~100 nuclei • Tetrahedral shapes

  20. Critical-Point Boundary for the Nuclear Quantum Phase transition near A=100 Mass measurements of 96,97Kr @ ISOLDE No deformation evidenced around A=100 in Kr chain ! S. Naimi, G. Audi (CSNSM) et al. PRL 105 (2010) 032502

  21. Search for Tetrahedral shapes Huge gaps for tetrahedral configurations Possible signatures : hindered inter-band E2 transitions and Q0~0 Experimental program JYVL, Orsay, LNL,ANL, ILL Hindered E2 in one band-head of 156Gd Independent Q0 measurement planned… Collaboration TetraNuc IN2P3 : IPHC Strasbourg, IPN Lyon, CSNSM Orsay, IPN Orsay

  22. Superallowed Fermi interactions: 0+ 0+ β decay between isobaric analogs • CVC hypothesis: Universal weak-vector coupling Need T1/2, BR, Qb 38Ca : T1/2, BR – LISE/GANIL - 2009 30S : T1/2 – Jyväskylä, Accepted in EPJ A 38Ca : T1/2 – ISOLDE - EPJ A44, 363 (2010) 42Ti : T1/2, BR, Qb – Jyväskylä, PRC 80, 035502 (2009) 26Si : T1/2 – Jyväskylä, EPJ A38, 247 (2008) 62Ga : T1/2, BR, Qb – Jyväskylä, GSI – 3 publications Perspectives : T1/2, BR – 14O, 18Ne, 34Ar @ SPIRAL 26Si, 30S, 38Ca, 42Ti @ LISE and Jyväskylä 62Ga, 66As, 70Br, 74Rb, 78Y, 82Nb, 86Tc, 90Rh, 94As, 98In @DESIR Collabs IN2P3: CENBG, GANIL Gamow Teller transitions in mirror systems 29P, 31S : T1/2 - Jyväskylä – 2009 39Ca : T1/2 – ISOLDE - EPJ A44, 363 (2010) Perspectives :T1/2, BR - 15O, 21Na, 39Ca @ SPIRAL,23Mg, 31S, 41Sc @DESIR, Jyväskylä or ISOLDE Fundamental interactions

  23. Nuclear collisions / phase transitions G. Lehaut et al. PRL 104 (2010) 232701 Phase transition in nuclear matter Bimodality of fragment distrib E. Bonnet et al. PRL 105 (2010) 142701 Shell effects in SHE by means of fission times Modelling fusion and fission Experimental study of fission of transuranium Fundamental + applied (VAMOS Gedepeon, Euratom) • Isospin dependence of symmetry energy • - Production of superheavy nuclei Modeling of multinucleon transfer Collabs: GANIL, IPNO, IPNL INDRA detector

  24. Some Conclusions • IN2P3 physicists: • - Involved in different valuable items of nuclear structure and reactions • Have significant impact in the collaborations • Use various detectors and accelerators (GANIL amounts to about 50%) • Deeply involved in future projects (AGATA, S3, FAZIA, PARIS) AGATA B(E2) transitions in 74Zn using plunger method Proposal: IRFU

  25. This was not a fully inclusive presentation !

  26. Study of nuclear stopping in central collisions • Stopping systematics for central collisions of symmetric systems • INDRA@GANIL,GSI INDRA and ALADIN collaborations (G. Lehaut et al.), Phys. Rev. Lett. 104, 232701 (2010) Isotropy/Stopping Below Fermi energy: stopping (isotropy) decreases Above Fermi energy: stopping depends on system size IN-MEDIUM NUCLEON-NUCLEON COLLISIONS MEAN FIELD

  27. A broad resonance influencing the 18F destruction in novae Dalouzy et al. PRL 102 (2009) 162503 Proton energy distribution Broad resonance in 19Ne 18F(p,g)19Ne ½+ 18F main source of g radiation in novae Destroyed mainly by 18F(p,g)19Ne reaction Use 19Ne(p,p’)18F(p) at LLN

  28. 0 0 0 0 0.1 0.1 0.1 0.1 0.2 0.2 0.2 0.2 0.3 0.3 0.3 0.3 0.4 0.4 0.4 0.4 84Ga T1/2 = 0,09 s 1046 (4+) N=48 247,7 624,3 2+ 83Ge T1/2 = 0,9 s 84Ge 306,5 242,4 100 83As 84As N=50 N=52 N=54 D1S Gogny HFB calculation GCM  Bohr dynamics

  29. VAMOS 5 4 3 2 1 (b) 20O(d,p)21O 8 (a) Ed (MeV) g.s. 5 6 4 4 DE (MeV) 2 3 E*=1.2 MeV 2 60 120 40 100 80 140 160 Angle (deg) MUST2 1 2.5 2.2 2.3 2.4 2.6 A/Q 20O(d,t)19O 20O(d,pn)20O Et (MeV) Preliminary B. Fernandez 3/2+ (3/2+) (c) 10 40 30 20 Angle (deg) Energy [MeV]

  30. Collab: IPHC, IPNO, IPNL,

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