Ponente
Descripción
The study of 𝛽𝛽-decays far from stability is essential to understand the evolution of nuclear structure and nucleosynthesis processes. 𝛽𝛽-decay experiments with such exotic nuclei involve intense cocktail beams from fragmentation facilities. The role of an implantation detector in these experiments is to measure the energy and the positions of both heavy ion implantation and 𝛽𝛽-ray emission to correlate the identified ion with 𝛽𝛽-decay events.
Due to the lack of time resolution of conventional Silicon strip detectors, we have previously developed a new implantation detector using a segmented YSO (Yttrium Orthosilicate) scintillator array for time-of-flight spectroscopy of the 𝛽𝛽-delayed neutron emission [1]. The new detector was implemented in 𝛽𝛽-delayed neutron measurement experiments at RIKEN RI Beam Factory, and it was confirmed that the YSO detector correlates 𝛽𝛽 and implant events better due to its higher effective atomic number Z~35.
The success of the YSO detector motivated us to develop a new detector using heavier scintillator material. We will report on the design and some test results of the new detector using (Gd,139La)2Si2O7:Ce (A=139 enriched La-GPS [2, 3] ) crystal which has a much higher effective atomic number (Z~51) and is expected to have better 𝛽𝛽-implant efficiency with a lower background.
[1] R. Yokoyama et al., NIM A 937, 93-97 (2019)
[2] S. Kurosawa et al., NIM A 744, 30-34 (2014)
[3] S. Kurosawa et al., IEEE TNS 65, 2136-2139 (2018)
