Single-particle and collective motions from nuclear many-body correlation (PCM2025)

Development of segmented La-GPS scintillation detector as a new β-implant detection tool

5 Mar 2025, 15:11

1m

Main Lecture Hall (University of Aizu)

Poster session

Speaker

Yasmin Anuar

Description

In recent years, there have been ongoing efforts to better understand the rapid neutron capture process in the nucleosynthesis of elements. Such efforts include the measurements of β-decay and delayed multineutron emissions of these elements to allow for a more accurate input for the calculations in relation to the rapid neutron capture process modelling. Typically, β-γ spectroscopies are carried out with implantation detectors such as the Silicon strip detectors whose role is to measure the energy and position of the implant events and β-ray emissions. However, Silicon strip detectors are incapable of fast timing response for the purpose of neutron time-of-flight measurements of the delayed multineutron emissions. Furthermore, as the study progresses further away from stability and towards more neutron-rich elements, there is a need for better implantation detectors. Hence, a new implantation detector was developed using segmented Yttrium Orthosilicate (YSO) scintillator crystal which has a higher effective atomic number, Z ≈ 35 and density, ρ ≈ 4.5 g/cm${}^3$. These qualities of the YSO detector allow for correlation efficiency of 80% between the implant events and the β-decay with correlation radius of 3 mm. This improvement with the YSO detector encourages the development of another with heavier scintillator crystal, (Ga, La)${}_2$Si${}_2$O${}_7$:Ce (La-GPS) whose Z ≈ 51 and ρ ≈ 5.2 g/cm${}^3$. The La-GPS detector was proposed in hopes of achieving better correlation radius and faster timing response at the same efficiency as the YSO detector. This study then entails the current development of the La-GPS detector of 1.5 x 1.5 mm segments arranged into a 32 x 32 array in the x-y plane.

References :

1. Suzuki, A., Kurosawa, S., Shishido, T., Pejchal, J., Yokota, Y., Futami, Y., & Yoshikawa, A. (2012). Fast and High-Energy-Resolution Oxide Scintillator: Ce-Doped (La,Gd)${}_2$Si${}_2$O${}_7$. Applied Physics Express, 5(10), 102601. https://doi.org/10.1143/apex.5.102601
2. Kurosawa, S., Shishido, T., Suzuki, A., Pejchal, J., Yokota, Y., & Yoshikawa, A. (2014). Performance of Ce-doped (La, Gd)${}_2$Si${}_2$O${}_7$ scintillator with an avalanche photodiode. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 744, 30–34. https://doi.org/10.1016/j.nima.2014.01.018
3. Mumpower, M.R., R. Surman, G.C. McLaughlin, and A. Aprahamian. 2016. “The Impact of Individual Nuclear Properties on R-Process Nucleosynthesis.” Progress in Particle and Nuclear Physics 86 (January): 86–126. https://doi.org/10.1016/j.ppnp.2015.09.001.
4. Grzywacz, R., M. Singh, T. King, R. Yokoyama, J. Agramunt, N. Brewer, S. Go, et al. 2017. “First Implementation of the New Segmented Implantation Detector for Decay Studies with BRIKEN Array.” Nucl. Instrum. Methods A 12 (2): 182. https://www.nishina.riken.jp/researcher/APR/APR051/pdf/150.pdf.
5. Kurosawa, S., Horiai, T., Murakami, R., Shoji, Y., Jan, P., Yamaji, A., Kodama, S., Ohashi, Y., Yokota, Y., Kamada, K., Yoshikawa, A., Ohnishi, A., & Kitaura, M. (2018). Comprehensive Study on Ce-Doped (Gd, La)${}_2$Si${}_2$O${}_7$ Scintillator. IEEE Transactions on Nuclear Science, 65(8), 2136–2139. https://doi.org/10.1109/tns.2018.2841917
6. Yokoyama, R., M. Singh, R. Grzywacz, A. Keeler, T.T. King, J. Agramunt, N.T Brewer, et al. 2019. “Segmented YSO Scintillation Detectors as a New β-Implant Detection Tool for Decay Spectroscopy in Fragmentation Facilities.” Nuclear Instruments and Methods in Physics Research Section a Accelerators Spectrometers Detectors and Associated Equipment 937 (May): 93–97. https://doi.org/10.1016/j.nima.2019.05.026.