Speaker
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The $\beta$-decay properties of very neutron-rich nuclei, such as half-lives and $\beta$-delayed neutron emission probabilities, play an essential role in the astrophysical rapid neutron capture process ($r$-process), where the elements heavier than iron may be synthesized [1,2]. The investigation of those crucial properties has been one of the main objectives of the experimental programs at the RIKEN RI Beam Factory (RIBF) [3,4]. Recently, the development of a fast-timing detector system comprising a highly-segmented plastic scintillation detector GARi (Gas-cell Active detector for Radioisotope decay), a neutron time-of-flight detector array and a LaBr$_{3}$ detector array is being conducted for the measurement of $\beta$-delayed neutron emission and other related $\beta$-decay properties of neutron-rich nuclei at the F11 decay station of RIBF. The GARi detector has been constructed from a fast, segmented plastic scintillator coupled with nine multi-anode photomultiplier tubes (PMTs), resulting in enhanced position sensitivity. Therefore, this detector can be employed as an implantation detector and also served for providing a trigger signal in neutron time-of-flight experiments. This poster details the development of the GARi detector and the results tested with the radioactive sources.
[1] E.M. Burbidge et al., Rev. Mod. Phys. 29, 547 (1957).
[2] T. Kajino et al., Prog. Part. Nucl. Phys. 107 (2019) 109–166
[3] S. Nishimura, Prog. Theor. Exp. Phys. 2012, 03C006 (2012).
[4] I. Dillmann and A. Tarifeño-Saldivia. Nuclear Physics News 28-3, (2018)
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