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Freiburg 1999 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 50: Kernphysik VI / Spaltung

HK 50.6: Vortrag

Donnerstag, 25. März 1999, 15:15–15:30, B

Experimental Evidence for Two-Proton Radioactivity — •P.G. Thirolf1, M.J. Chromik1, M. Thoennessen2, A. Azhari2, J. Brown2, M. Fauerbach2, T. Glasmacher2, R.W. Ibbotson2, R.A. Kryger2, D.J. Morrissey2, H. Scheit2, M. Steiner2, P.J. Woods3, and S. Yokoyama21Ludwig-Maximilians-Universität München — 2NSCL, Michigan State University — 3University of Edinburgh

17Ne is a promising candidate for the long-searched identification of a simultaneous two-proton emission, since its first excited state is bound with respect to the emission of one proton but unbound to the emission of two protons. The competing γ-decay branch to the ground state has been measured [1], leaving room for the existence of a simultaneous two-proton decay branch to 15O. In an experiment at the K1200 cyclotron at the NSCL (MSU) a secondary 17Ne beam (60 A·MeV) was produced from a primary 20Ne beam of 100 A·MeV, separated in the A1200 fragment separator and further purified using a Wien filter. The 17Ne then bombarded a 150 mg/cm2 197Au target, populating the first excited state via Coulomb excitation. A position sensitive multi-stage particle telescope allowed for a kinematical complete detection of the scattered projectiles as well as of all decay products. Sequential 2p-decay could be observed from the decay of higher-lying states in 17Ne, while at a decay energy around 300 keV experimental evidence was found for simultaneous two-proton emission from the first excited state.
[1] M.J. Chromik et al., Phys. Rev. C55 (1997), 1676

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