The
second major experiment with the OTPC performed at NSCL/MSU in March
2011 was devoted to 48Ni. A special rotating target device,
developed at UT/ORNL was installed to accept the 58Ni beam intesity
reaching 40 pnA. During
10 days of irradiations, 9 atoms of 48Ni entered the OTPC. Six decays
were observed. The main result was the first observation of 2p
radioactivity of this nucleus (4 events). 2 decays represented
beta-delayed proton emission. The
beta decay channels of 46Fe and 44Cr with emission of delayed protons
were observed as well. The counting gas was a
mixture of 49.5% He + 49.5% Ar + 1% N2 at atmospheric pressure.
The CCD exposure time was 30 ms.
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