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Nuclear structure and Selected Higlights Shell evolution and nuclear interactions Reactions with weakly bound nuclei Nuclear Astrophysics.

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Presentation on theme: "Nuclear structure and Selected Higlights Shell evolution and nuclear interactions Reactions with weakly bound nuclei Nuclear Astrophysics."— Presentation transcript:

1 Nuclear structure and 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

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 92 Pd Two proton radioactivity ALTO

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

4 UK labs + IPN Orsay, GANIL, LPC Caen from IN2P3 Evolution of shell gaps using (d,p) and (d,t) with 20 O and 26 Ne beams at SPIRAL TIARA-MUST2-EXOGAM-VAMOS COLLABORATION Position sensitive Si Barrel Hyball annular detectors 4 MUST2 SPIRAL1 beams Exogam Th. Neutron SPE (MeV) Neutron Number d 5/2 s 1/2 d 3/2 d5d5 d3d3 O s1s1 fp states ? 8 (d,p) (d,t) 20 O Energy [MeV] 3/2 + (3/2 + ) Preliminary B. Fernandez SnSn Location of the unbound d 3/2 orbit

5 EXOGAM: 11 Clovers with partial shield. ~ 10% for E =1.3 MeV The Neutron Wall: 50 liquid scintillator detectors. 1n ~ 23% DIAMANT: 80 CsI(Tl) dets. p or ~ 66% 92 Pd spectroscopy using EXOGAM-Nwall-DIAMANT

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

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

8 Orsay Production of f/s by photofission of 238 UC x 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 Achievements published so far: Beta-decay spectroscopy of N~50 nuclei (D. Verney IPNO) increase of intensity coming soon

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

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

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

12 60 Fe cosmic ray emittor possibly detected by INTEGRAL Destroyed mainly by 60 Fe(n, ) 61 Fe reaction Studied by 60 Fe(d,p) 61 Fe at GANIL E* NpNp 61 Fe S. Giron, F. Hammache, N. de Séréville preliminary Drotleff 93 Brune 93 Orsay 3/2 + Gamow peak 1/2 + M.G. Pellegriti, F. Hammache et al. PRC 70 (2008) C(,n) 16 O source of neutrons for s process in AGB stars Studied at Orsay TANDEM using 13 C( 7 Li,t) 17 O Nuclear Astrophysics Collaboration IPNO/CSNSM/GANIL ½+ 18 F(p, ) 19 Ne JC Dalouzy, de Oliveira et al. PRL 102 (2009) new 18 F main source of radiation in novae Destroyed mainly by 18 F(p, ) 19 Ne reaction Studied by 19 Ne(p,p) 18 F(p) at LLN

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

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

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

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

17 (deg) Normalized Yield Fusion-Fission U sequential fission+ …….. Quasi-elastic (target) min 0.2 t reac > s Blocking technique: evidence for long times at Z=120 t reac < t min (thermal vibrations) min 0.1 t min s INDRA, Collab: IPNO, GANIL, IPNL

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

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

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

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

22 Fundamental interactions Superallowed Fermi interactions: β decay between isobaric analogs CVC hypothesis: Universal weak-vector coupling Need T 1/2, BR, Q Gamow Teller transitions in mirror systems 29 P, 31 S : T 1/2 - Jyväskylä – Ca : T 1/2 – ISOLDE - EPJ A44, 363 (2010) Perspectives : T 1/2, BR - 15 O, 21 Na, 39 SPIRAL, 23 Mg, 31 S, 41 Jyväskylä or ISOLDE 38 Ca : T 1/2, BR – LISE/GANIL S : T 1/2 – Jyväskylä, Accepted in EPJ A 38 Ca : T 1/2 – ISOLDE - EPJ A44, 363 (2010) 42 Ti : T 1/2, BR, Q – Jyväskylä, PRC 80, (2009) 26 Si : T 1/2 – Jyväskylä, EPJ A38, 247 (2008) 62 Ga : T 1/2, BR, Q – Jyväskylä, GSI – 3 publications Perspectives : T 1/2, BR – 14 O, 18 Ne, 34 SPIRAL 26 Si, 30 S, 38 Ca, 42 LISE and Jyväskylä 62 Ga, 66 As, 70 Br, 74 Rb, 78 Y, 82 Nb, 86 Tc, 90 Rh, 94 As, 98 Collabs IN2P3: CENBG, GANIL

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

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 74 Zn using plunger method Proposal: IRFU

25 This was not a fully inclusive presentation !

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


28 18 F main source of radiation in novae Destroyed mainly by 18 F(p, ) 19 Ne reaction Use 19 Ne(p,p) 18 F(p) at LLN Broad resonance in 19 Ne Proton energy distribution A broad resonance influencing the 18F destruction in novae ½+ 18 F(p, ) 19 Ne Dalouzy et al. PRL 102 (2009)

29 T 1/2 = 0,09 s T 1/2 = 0,9 s 84 Ga 84 Ge 83 Ge 624,3 242, ,5 84 As 83 As ,7 N= N= N= N= D1S Gogny HFB calculation GCM Bohr dynamics 2+ (4+)

30 VAMOS 20 O(d,t) 19 O MUST2 (a) (c) 20 O(d,p) 21 O (b) E t (MeV) E d (MeV) E*=1.2 MeV g.s E (MeV) 1 Angle (deg) A/Q 20 O(d,pn) 20 O Angle (deg) Energy [MeV] 3/2 + (3/2 + ) Preliminary B. Fernandez

31 Collab: IPHC, IPNO, IPNL,

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