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Dresden 2000 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 28: Kernphysik / Spektroskopie IV

HK 28.3: Talk

Thursday, March 23, 2000, 17:15–17:30, B 68

First experimental identification of simultaneous two-proton radioactivity — •M.J. Chromik1, D. Gassmann1, P. Reiter1, P.G. Thirolf1, M. Thoennessen2, T. Glasmacher2, R.W. Ibbotson2, R.A. Kryger2, D.J. Morrissey2, J. Prisciandaro2, H. Scheit2, M. Steiner2, E. Tryggestad2, P.J. Woods3, and T. Davinson31Ludwig-Maximilians-Universität München — 2NSCL, Michigan State University — 3University of Edinburgh

With the first excited state of 17Ne being bound to one-proton emission but unbound to the emission of two protons, this nucleus is a promising candidate for the first-time identification of simultaneous two-proton radioactivity. Indeed experimental evidence for this long-searched decay mode has been found in a first experiment, however with limited statistics [1]. Therefore a new experiment has been performed, optimized for high detection efficiency. The first excited state in 17Ne has been populated via Coulomb excitation by scattering a 17Ne secondary beam off a 197Au target. The 17Ne beam (60 A·MeV) was produced from a primary beam of 20Ne (100 A·MeV) at the K1200 cyclotron of the NSCL (MSU) via projectile fragmentation, separated by the A1200 fragment separator and purified using a Wien filter. A kinematical complete detection of all reaction products was performed using a highly segmented multi-stage particle telescope, enhanced in granularity and resolution compared to the previous setup. Results of the analysis on the identification of the two-proton radioactivity will be presented, also aiming at an answer to the question of a possible correlation between the two protons.
[1] M.J. Chromik et al., AIP Conf. Proc. 481, p.187 (1999)

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