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Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Poster

HK 48.36: Poster

Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer

Search for two-proton radioactivity of 30Ar by tracking its decay products — •Xiaodong Xu — GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — Justus-Liebig-Universität Giessen, Giessen

Two-proton (2p) radioactivity is an exotic decay mode resulting in a simultaneous emission of two protons. It was predicted for a number of neutron deficient nuclei beyond the proton drip line [1]. The ground-state (g.s.) 2p radioactivity was discovered in 2002 [2,3].

In 2012, an in-flight decay experiment aimed to investigate the 2p radioactivity of previously unknown nucleus 30Ar was performed with the fragment separator FRS of GSI. By tracking the decay products with silicon micro-strip detectors, 2p decays of 30Ar in-flight have been observed for the first time. The decay vertices were reconstructed through the measured 28S + p + p trajectories. In order to obtain the 2p decay energy and half-life, the angular correlations of fragments were analyzed. New data on the known 2p precursor 19Mg has been also obtained. The decay energy of g.s. of 19Mg has been deduced and it is consistent with the previously reported data [4].

[1] V. Goldansky, Nucl. Phys. 19, 482 (1960)

[2] M. Pfützner, et al., Eur. Phys. J. A 14, 279 (2002)

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

[4] I. Mukha, et al., Phys. Rev. C 85, 044325 (2012)

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