Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 66: Plenary VIII

HK 66.4: Invited Talk

Thursday, March 19, 2009, 12:30–13:00, Audi-Max

Two-proton radioactivity as a tool of nuclear structure — •Bertram Blank — CEN Bordeaux-Gradignan, Chemin du Solarium, F-33175 Gradignan Cedex, France

Two-proton radioactivity is the latest nuclear decay mode discovered. It consists of the emission of a pair of protons from a nuclear ground state.

In pioneering experiments at GANIL and GSI, this new radioactivity was discovered in 2002 [1,2] and meanwhile 45Fe and 54Zn [3] are established 2p emitters, with a possible third nucleus, 48Ni [4]. These results allowed a detailed comparison with the theoretical models.

The latest step in the investigation of 2p radioactivity was the use of time-projection chambers to study the decay dynamics via measurements of the individual proton energies and the relative proton-proton emission angle. A first experiment at GANIL [5] and an experiment performed at MSU [6] allowed to gain first insights into the decay characteristics.

The talk will review the experimental results on ground-state two-proton radioactivity and compare these results with theoretical predictions. Future studies with 2p emitters will be discussed as well.

[1] J. Giovinazzo et al., Phys. Rev. Lett. 89 (2002) 102501

[2] M. Pfützner et al., Eur. Phys. J. A14 (2002) 279

[3] B. Blank et al., Phys. Rev. Lett. 94 (2005) 232501

[4] C. Dossat et al., Phys. Rev. C72 (2005) 054315

[5] J. Giovinazzo et al., Phys. Rev. Lett. 99 (2007) 102501

[6] K. Miernik et al., Phys. Rev. Lett. 99 (2007) 192501