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Sandrine Courtin Atelier de l’ESNT Saclay, Feb. 4-6 / 2008 Captures and Molecules … Sandrine Courtin Institut Pluridisciplinaire Hubert Curien, Département.

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Presentation on theme: "Sandrine Courtin Atelier de l’ESNT Saclay, Feb. 4-6 / 2008 Captures and Molecules … Sandrine Courtin Institut Pluridisciplinaire Hubert Curien, Département."— Presentation transcript:

1 Sandrine Courtin Atelier de l’ESNT Saclay, Feb. 4-6 / 2008 Captures and Molecules … Sandrine Courtin Institut Pluridisciplinaire Hubert Curien, Département des Recherches Subatomiques and Université Strasbourg I

2 Sandrine Courtin Atelier de l’ESNT Saclay, Feb. 4-6 / 2008 8 8 20 28 50 82 126 -9.32 11.8 Now N-rich around N = 20 – 28 How ? Transfer reactions  transfer process / nucleon-nucleon  spectroscopy Ex : 40 Ar (E Lab = 255 MeV) + 208 Pb (11/2007) n-rich Ar Where ? Legnaro (Prisma-Clara), GANIL Collaboration : IPHC, Univ. Zagreb (S. Szilner et al.), Univ. Torino, LNL Legnaro (L. Corradi et al.), Univ. of West Scotland (R. Chapman et al.) Theory : G. Pollarolo (Univ. Torino), E. Caurier, F. Nowacki (IPHC) AME03-LMD, P. Van Isacker et A.E.L. Dieperink, Int. J Mod. Phys. E15,1371(2006)

3 Sandrine Courtin Atelier de l’ESNT Saclay, Feb. 4-6 / 2008 Clustering in light heavy-ions How ? Narrow ‘molecular’ resonances, fragment, particle,  decay Ex : ( 24 Mg- 24 Mg) resonances in 48 Cr ( 12 C - 12 C) resonances in 24 Mg ( 12 C - 16 O) resonances in 28 Si Where ? Legnaro (Prisma-Clara), Berkeley (Gammasphere), Triumf (Dragon + BGO), Argonne (Gammasphere+FMA) Collaboration : IPHC, Univ. York (D. Jenkins et al.), Triumf (D. Hutcheon et al.) ANL (C. Lister et al.), Univ. of West Scotland (R. Chapman et al.) Theory : J. Dudek (IPHC), K. Pomorski (Lublin) LSD Model S. Ohkubo. K. Yamashita (Univ. Kochi)  CM D. Baye and P. Descouvemont (ULB) GCM J. Cseh and G. Lévaì (Atomki, Debrecen) ACM ( 12 C - 12 C) resonances in 24 Mg ( 12 C - 16 O) resonances in 28 Si Molecules  Deformation   -decay Radiative Capture Reactions : recent results Now

4 Sandrine Courtin Atelier de l’ESNT Saclay, Feb. 4-6 / 2008 12 C( 12 C,  ) 24 Mg and 12 C( 16 O,  ) 28 Si Setting the stage Resonances ? NOC ( F. Haas and Y. Abe, Phys. Rev. Lett. 46 (1981) 1667 ) Radiative Capture : Light Particles vs Heavy-Ions Light heavy-ions : 12 C+ 12 C  24 Mg, 12 C+ 16 O  28 Si Sandorfi et al. (BNL, ~ 1980) Narrow resonances @ B c No recoil, decay to g.s. Narrow Resonances (150 keV),  E  t ~ h  molecules

5 Sandrine Courtin Atelier de l’ESNT Saclay, Feb. 4-6 / 2008 Results on 12 C( 12 C,  ) 24 Mg and 12 C( 16 O,  ) 28 Si First Stage Second Stage D.A. Hutcheon et al., NIM A 498, 190 (2003).  ISAC I : RNBs / Stable (OLIS) 0° spectrometer  0° spectrometer  Tof on 17 m Beam rejection 10 13  Beam rejection 10 13   Acceptance : cone half angle 20 mrad  gas/solid target system  recoil detectors (DSSSD, …)  BGO array (  = 50 % @ 5 MeV) Measurements ON- and OFF resonance @ B C

6 Sandrine Courtin Atelier de l’ESNT Saclay, Feb. 4-6 / 2008 Results on 12 C( 12 C,  ) 24 Mg and 12 C( 16 O,  ) 28 Si 12 C+ 16 O Gamma spectrum ( 28 Si) 2 + → 0 + 4 + → 2 + 3 +,0 +, 3 - ~14 MeV 12 C+ 16 O Highest energy  -ray 25 MeV ~ 11 MeV 0 MeV 28 Si 20 MeV ~ 10 MeV 0 MeV 24 Mg 12 C+ 12 C Highest energy  -ray ~ 10 MeV S. C. et al., Fusion 06, San Servolo, AIP Conf. Proc. 853 (2006), S. C. et al., Journal of Physics G, London (2008). ~ 14 MeV

7 Sandrine Courtin Atelier de l’ESNT Saclay, Feb. 4-6 / 2008 Clusters ?  Shell Model ? 16 O, doubly magic …, 0 + 2, 2 +, 4 + … B(E2) (2 +  0 + ) = 27 W.u., B(E2) (4 +  2 + ) = 65 W.u. 8 Be, 9 Be, 10 Be 12 C (0 +, Hoyle) … Model Space …  Cluster Models ? CM (Abe & Uegaki), ex : 24 Mg- 24 Mg resonances in 48 Cr. GCM, (Baye & Descouvemont), deformed structures, rotational bands.  AMD ? Ab initio (Horiuchi, Kanada En’yo) 24 Mg, 28 Si, 32 S, 36 Ar, 40 Ca, 28 Mg Deformed structures, SD, clusters … Clusters in n-rich nuclei

8 Sandrine Courtin Atelier de l’ESNT Saclay, Feb. 4-6 / 2008 Results on 12 C( 12 C,  ) 24 Mg and 12 C( 16 O,  ) 28 Si Theory What is the structure of those states ? 28 Si( 12 C- 16 0) Ohkubo and Yamashita, Phys.Lett. B 578 (2004) 304. 24 Mg( 12 C- 12 C) P. Descouvemont and D. Baye, Phys.Lett. 169 B (1986) 143. Links between low-lying members of these cluster bands ?  Links between low-lying members of these cluster bands ?

9 Sandrine Courtin Atelier de l’ESNT Saclay, Feb. 4-6 / 2008 2 + resonance ? (E cm = 6 MeV) simulation experiment  Resonances strongly correlated to 24 Mg and 28 Si states  Large part of the flux via doorway states around 10-11 MeV. (  threshold = 9.3 MeV and 10.0 MeV) D.G. Jenkins, S. Courtin et al., Phys. Rev. C (in press) Results on 12 C( 12 C,  ) 24 Mg and 12 C( 16 O,  ) 28 Si 12 C+ 12 C 12 C+ 16 O  2 scenarii 1- States with a specific structure ? 2- Decay via T = 1 states through  T = 1 M1 allowed transitions may be favoured in this N = Z nucleus …

10 Sandrine Courtin Atelier de l’ESNT Saclay, Feb. 4-6 / 2008 © H. Esbensen, S. Misicu R → 6.05 R → 6.9 6.09 → g.s. R → g.s. Lower energies ? What happens below B C and down to E astro … ? 12 C(  ) 16 O, Dragon data E  Medium mass systems fusion X-sections, hindrance … Ex : 64 Ni + 64 Ni, incompressibility, CC calc. 36 S+ 48 Ca, LNL, Legnaro, 10/2007 (20% below B C )  12 C + 12 C, 12 C + 16 O C.L. Liang, K.E. Rehm, B.B. Back and R.V.F. Janssens, PRC 75, 015803 (2007), 16 O and 12 C induced fusion. S extrapolated to low energies …  12 C(  ) 16 O Reaction rate,  = 0.01 fb @ E Gamow Direct kin. (Stuttgart, M. Assuncao et al., PRC 73 (2006) 055801), no recoil Inverse kin. (Triumf, C. Matei et al. PRL 97 (2006) 242503) recoil with Dragon, new path …

11 Sandrine Courtin Atelier de l’ESNT Saclay, Feb. 4-6 / 2008 Next move Shell model and mean field, a kind of unified view TDHF, reaction mechanism at B c and below as a function of the reacting time … Identify the doorway states Giant resonances & molecular resonances … ? N-rich clusters ?  new generation of scintillators (LaBr 3 (Ce)) + state-of-the-art spectro … 12 C + 12 C, why ?E

12 Sandrine Courtin Atelier de l’ESNT Saclay, Feb. 4-6 / 2008 Breakup reactions 28 Si  12 C+ 16 O, 24 Mg  12 C+ 12 C 12 C+ 16 O breakup states to 45 MeV. C.J. Metelko et al., J. Phys. G29 (2003), 697 Reaction 12 C( 20 Ne, 12 C 16 O)  @ ANL 12 C+ 12 C breakup states to 50 MeV C.J. Metelko et al., Phys.Rev. C68 (2003) 0544321 Reaction 12 C( 16 O, 12 C 12 C)  RC 12 C+ 16 O et 12 C+ 12 C

13 Sandrine Courtin Atelier de l’ESNT Saclay, Feb. 4-6 / 2008  EM transitions between resonant states Multinucleon transfer, far from stability (collab. L. Corradi, LNL)  n-pairs transfers in n-rich nuclei   fus very @ low E. SPIRAL2 PARIS Nuclear Molecules  resonances and doorway states Gammasphere+FMA, AGATA, PARIS SPIRAL 2 24 Si detectors @ 45° + highly efficient  -array

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