GANIL / SPIRAL1 / SPIRAL2
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- Erick Osborne
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1 Nuclear Structure, Reaction and Dynamics GANIL / SPIRAL1 / SPIRAL2
2 A huge discovery potential Exotic Nuclei Proton number Z Which force? 3-body, tensor, spin-orbit, Isospin dependence, Continuum coupling Neutron number N Leading to which structure? Haloes, neutron skins, molecular states, new shells and magic numbers, super-heavies. Playing which role in the Univers? Nucleosynthesis, supernovae, Neutron stars.
3 Stable Beams GANIL s cyclotrons Multi-beam operating mode From Carbon to Uranium Up to 95 MeV/u and 24 MeV/u pps MeV/u SPIRAL2 s LINAG 33 MeV p, 40 MeV d, 14.5 AMeV HI A/Q=2 (5 ma) ; A/Q=3 (1 ma) ; A/Q=6
4 Fusion evaporation reactions Example : B Cederwall et al, Nature (2010) 58 Ni( 36 Ar,2n) 92 Pd E=3 AMeV N=Z=46 Isoscalar n-p pairing Neutron wall 92 Pd EXOGAM NEDA
5 Spectroscopy of Super Heavy Elements Production: On LISE with FULIS Mode On S3 Example : performed recently at GANIL J. Piot, M. Vostinar et al. 209 Bi( 50 Ti,2n) 257 Db (Z=105) 2.4 nb Example : A. Chatillon, Ch. Theisen et al. Eur. Phys. J. A 30, 397 (2006) 209 Bi( 48 Ca,2n) 255 Lr (Z=103) gs 255 Lr J=1/2- Isomeric state Ex=37 kev 7/2- Spectroscopy of daughter nuclei obtained All HFB theories faill to reproduce 255 Lr Suggests a slightly underestimated 2f5/2 Wien Filter
6 (Collab.. IPHC Strasbourg, Dept Fisica Teorica Madrid, School of Eng. and Science Paisley, CEA Saclay) Deep-inelastic reactions Example : S. Bhattacharyya, M. Rejmund, A. Navin et al. PRL 101 (2008) U (5.5 MeV/u) on 48 Ca target N= Ca 47 K EXOGAM 46 Ar 47 Ar 48 Ar 45 Cl 44 S 43 P 42 Si PARIS First indication of Triaxiality in 48 Ar at low spin. p oblate shape n prolate shape
7 Physics cases for the AGATA campaign in GANIL ~ 50 LoI submitted 4 main setups: o Vamos in magnetic spectrometer o Vamos in gas-filled o Nwall + Diamant o DSSSD (SPIRAL1) Ru, Pd Zr, Mo 38 K 34 Ar 63 Ge 102 Sn 100 In 80 Zr 77 Y 75 Sr Ne,Na 46 Ti 46,48 Ca S,Cl,Ar,K Pb Hg 78 Ni Sm,Pm 132 In 80 Zn 68 Ni,Fe,Co,Cu Dy,Er,Yb Xe,Te Zr, Sr 256 Rf 254 No 206 Hg 238 U Cm,Bk Cf,Es
8 Dynamics, Thermodynamics, Hot Nuclei Can we obtain a phenomenological equation of state for isospin asymmetric nuclear matter? The density dependence of the symmetry energy? Phase transition mechanism? Example : D. Gruyer, J. Frankland et al., PRL 110 (2013) INDRA t=0.2 t c t=1.0 t t=1.2 t c c Simulation : largest cluster size distribution evolves with time E=45AMeV E=35AMeV E=25AMeV Similarity between model and data indicates time-scale decreases with increasing bombarding energy 129 Xe+ nat Sn In data, largest fragment charge distribution evolves with beam energy FAZIA
9 Fragmentation beams LISE Radioactive Beams SPIRAL1 gas ions up to Xe ( < 25 MeV/u) + Febiad source ( 33 Cl, 23 Mg, 29 P, 26 Al, 38 K ) SPIRAL2 Low energy beams S3 - DESIR Fission fragments (phase 2) Other Beams Other Targets (phase 2) 1-15 AMeV
10 Beta Decay Studies / DESIR Example: A. Lepailleur, O. Sorlin et al., PRL110 (2013) S 26 F 6 pps with a purity of 22% 77 AMeV Proton-neutron 0d5/2 0d3/2 effective force used in shell-model calculations should be reduced
11 Transfer Reactions with post-accelerated beams Example : F. Flavigny, A. Gillibert et al. PRL 110, (2013) 14 O(d,t) 13 O ; 14 O(d, 3 He) 13 N 18MeV/n MUST2 Limited asymmetry dependence of correlations L =1 GASPARD
12 Resonant Elastic Scattering Example: M. Assié et al., PLB 2012, 198 H( 17 Ne,p) 17 Ne = 5 kev Intermediate nucleus in 19 Mg(2p) SPIRAL Beam : 17 4 A.MeV, 10 4 pps Beam purity ~ 100% 18 Na : The only intermediate nucleus known MAYA / ACTAR TPC
13 SPIRAL2 area of excellence 82 Letters of Intent (>1000 authors) for the Day 1 experiments at SPIRAL2 The primary beam intensities of the LINAC open new opportunity in the race for super-heavy nuclei With the fusion-evaporation of medium mass nuclei proton-rich nuclei like 100 Sn will be accessible Z=120 (1/m) 100 Sn (1/s) 132 Sn (10 9 /s) 92 Kr (10 9 /s) High intense neutron rich beams, in the intermediate masses, will be available for the first time 6 He (10 12 /s) With the stable light ions induced reactions : light exotic nuclei will be produced with intensities comparable to current stable beam NFS High intense neutron source covering the 1 40 MeV energy range will be available
14 Thank you
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