News on 12 C from  -decay studies Hans O. U. Fynbo Department of Physics and Astronomy University of Aarhus, Denmark What’s left to study in 12 C ? New.

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News on 12 C from  -decay studies Hans O. U. Fynbo Department of Physics and Astronomy University of Aarhus, Denmark What’s left to study in 12 C ? New results from  -decay studies Tokyo, June 4, 2007

What’s left to study in 12 C ? ++++ (11.2) (0/2 + ) 0+0+ (2 + ) (15.3) (2 -, 4 - ) Be +   Levels according to TUNL Ongoing theoretical interest : Ab-initio VMC or Greens-Function MC No core shell-modelQM-060, QW-070 AMD/FMD F1-1, F10-1, QW-062 Algebraic calculations Bijker &Iachello Cluster models QM-054, QT-021,QT-039, QW-015, QW-017 Condensate states ? Q5-5, F3-2, QT Astrophysics

Talk : O. Tengblad (F1-3) Posters : M. Alcorta, O. Kirsebom (QT-206)) 10 B( 3 He,p) 12 C Why is it experimentally challenging ?

(11.5) 0, (2 + ) (15.3) (3) (5) 0.015(3) (2) 0.946(6) (3) 0.027(4) (15) (12) (15)  -decay approach : Selection rules See also talk of M.Itoh (F11-7)

Nucl. Phys. A89 (1966) 401 Phys. Rev. 111 (1958) 567Phys. Rev. 130 (1963) 1953  12 N/ 12 B+X Target Beam  -decay approach : Earlier work

 12 N/ 12 B Magnetp/d 12 N/ 12 B+X 12 C/ 11 B Direct Kinematics+ISOL Nucl.Phys. A738 (2004) 59. Nucl.Phys. A760 (2005) 3. Nature 433 (2005) N/ 12 B+X 12 N/ 12 B  p/d 12 C/ 11 B Magnets Inverse Kinematics+Separator Talk : H.Wilschut (J2-5), Poster : R.Raabe (QT-011) Talks : J.Äystö (A1-4), L. Fraile (J2-2), H. Frånberg (J2-7)

ISOL Experiment N/ 12 B L.M. Fraile & J.Äystö, NIMA513 (2003) 287. Talks : J.Äystö (A1-4), L. Fraile (J2-2), H. Frånberg (J2-7)

 , 2 + ? Christian Diget 0 +, 2 + ?

R.Raabe, QT-011 KVI Experiment N/ 12 B K. Jungmann H. Wilschut Talk J2-5.

 , 2 + ? Solveig Hyldegaard 0 +, 2 + ?

KVI # 12 N = 8.8  10 7 IGISOL # 12 N = 1.2  10 8 Comparison of the two Experiments 1.43(7)% 2.7(4)% 0.55(2)% 0.56(7)% 0.46(15)% 0.122(7)% 0.108(15)% 0.28(8)%

 0 +, 2 + ? 1+1+ Christian Diget

 , 2 + ? 0+0+ Solveig Hyldegaard

Comparison of the two Experiments 1+1+ KVI # 12 B = 9.3  10 7 IGISOL # 12 B = 9.7  (4)% 1.2(3)% 0.108(4)% 0.116(13)% 0.08(2)% 3.0(2)  % 3.4(6)  %

Comparison of the two Decays 12 B 12 N

Comparison of the two Decays

R-matrix fits : Presently only to IGISOL and 8 Be(gs) Work in progress to include 8 Be(2 + ) and new data Nucl.Phys. A738 (2004) 59. Nucl.Phys. A760 (2005) 3. Nature 433 (2005) 136.

Collaborators C. Aa. Diget, H. Jeppesen, S.Hyldegaard, H.H. Knudsen, O. Kirsebom,K. Riisager, Department of Physics and Astronomy, Århus University, Denmark B. Jonson, M. Meister, T. Nilsson, G. Nyman, K. Wilhelmsen, Fundamental Physics, Chalmers University of Technology, Gothenburg, Sweden T. Eronen, W. Huang, J. Huikari, A. Jokinen, A. Kankainen, I. Moore, A. Nieminen, H. Penttilä, S. Rinta-Anttila, Y. Wang, J. Äystö, A. Saatamoinen, K. Perajärvi, Department of Physics, University of Jyväskylä, Finland B. Fulton, S.Fox University of York, United Kingdom. M. Alcorta, R. Boutami, M.J.G. Borge, L. Fraile, M. Madurga, O. Tengblad, M. Turrion, Instituto Estructura de la Materia, CSIC, Madrid, Spain Thank you for your attention ! F.C. Barker Australian National University K. Jungmann, S. Brandenburg, H. Wilschut, P. Dendooven, A. Rogachevskiy, G. Onderwater, E. Traykov, M. Sohani, KVI, Groningen, The Netherlands R. Raabe, J. Bücherer, Piet van Duppen, Mark Huyse, IKS, Leuven, Belgium