Abstract
The \( N=28\) isotone 60Ge , \( T_{z}=-2\), was produced and selected among the products of the fragmentation reaction of a 78Kr beam at 150 MeV/nucleon and a Be target by means of the A1900 fragment separator at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University (MSU). Its decay was studied for the first time using the optical time projection chamber. The \( \beta\)-decay of 60Ge was found to be dominated by \( \beta\)-delayed proton emission, with a branching of \( \approx 100\)% and half-life \( T_{1/2}=20_{-5}^{+7}\) ms.
Highlights
Exploring the properties of the nuclei lying far from the β-stability path is an important topic of nuclear physics studies
Experimental measurements that allow estimate of the binding energies and half-lives for β-decay on the proton-rich side of the chart of nuclei are crucial for astrophysics, as the competition between β-decay and particle capture shapes the rp-process path
The ions of 60Ge were transmitted from the focal plane of the A1900 spectrometer to the experimental vault where they were stopped in the active volume of the Optical Time Projection Chamber (OTPC) [3], where they decayed
Summary
Exploring the properties of the nuclei lying far from the β-stability path is an important topic of nuclear physics studies. Experimental measurements that allow estimate of the binding energies and half-lives for β-decay on the proton-rich side of the chart of nuclei are crucial for astrophysics, as the competition between β-decay and particle capture shapes the rp-process path. The ion optics setting of the A1900 separator and the achromatic aluminium degrader placed at the intermediate focal plane (thickness 384 mg/cm2) were optimized for the transmission of 60Ge. The ions of 60Ge were transmitted from the focal plane of the A1900 spectrometer to the experimental vault where they were stopped in the active volume of the Optical Time Projection Chamber (OTPC) [3], where they decayed.
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