Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 37: Nuclear Structure and Dynamics II

HK 37.1: Eingeladener Gruppenbericht

Dienstag, 17. März 2009, 16:30–17:00, H-ZO 50

Two-proton radioactivity and nuclear structure — •Marek Pfützner — Institute of Experimental Physics, University of Warsaw, 00-681 Warszawa, Poland

The detailed decay study of two-proton (2p) emitter ⁴⁵Fe has been performed at the A1900 separator at NSCL/MSU. A novel type of a gaseous detector employing digital imaging has been used [1]. Clear images unambiguously identifying the two-proton radioactivity channel were obtained which allowed the full reconstruction of decay events in three-dimensions [2]. For the first time, the angular and energy correlations between two protons emitted from the nuclear ground state could be determined. Results were found to be in good agreement with a three-body model of the two-proton radioactivity [3] which predicts a sensitivity of angular correlation to the structure of the initial nuclear state. Moreover, the same value of a structure parameter consistently reproduces the p-p angular correlation as well as the partial 2p half-life value. Thus, the 2p radioactivity offers a new tool to investigate the structure of extremely neutron-deficient nuclei.

Current status of the 2p decay studies, improvements of our detection technique, and plans to investigate other 2p emitters in vicinity of ⁴⁸Ni will be discussed.

1. K. Miernik et al., Nucl. Instr. and Methods in Phys. Res. A581, 194 (2007). 2. K. Miernik et al., Phys. Rev. Lett. 99, 192501 (2007). 3. L.V. Grigorenko and M.V. Zhukov, Phys. Rev. C 68, 054005 (2003).