Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Poster

HK 48.36: Poster

Wednesday, March 25, 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)