Speaker
Description
β-decay spectroscopy is a useful method for understanding physics of nuclear structure. In decay spectroscopy experiments, Double-Sided Silicon Strip Detectors (DSSSDs) have often been used because of their detection capability on ions and β-rays. In order to identify β-ray events in the DSSSDs, it is necessary to correlate a β-ray and a corresponding, implanted ion using time and position information.
This process of the β-ion correlation should be carried out carefully, because the correlation efficiency depends on the positions and the energy losses of the implanted ions and the emitted β-rays in the DSSSDs. In this analysis, a new algorithm has been introduced to improve the β-ion correlation efficiency with the DSSSD, WAS3ABi [1]. In the new approach, hit patterns of β-rays recorded in the WAS3ABi are categorized to determine the initial position of the β-rays. When the β-rays were detected by the plastic scintillators installed at upstream/downstream of the WAS3ABi, the directions of the β-rays were also deduced. Furthermore, some ions stopped at the surface of the DSSSD layers have also been analyzed [2], finally improving the β-ion correlation efficiency. We demonstrate that this method can successfully reduce the background from random β-ion correlations while collecting more correlated β-ion events, thus improving signal to background ratio.
[1] P. -A. Söderström et al., Nucl. Instrum. Methods Phys. Res. B 317, 649 (2013)
[2] I. Nishizuka et al., JPS Conf. Proc. 6, 030062 (2015)
