Subjects: Physics >> Nuclear Physics submitted time 2023-10-07
Abstract： Considering the R&D for upgrading the K0 L and µ detectors in the Belle II experiment using a scintillator and silicon photomultiplier (SiPM), we designed a compact high-speed and low-noise preamplifier. The preamplifier demonstrated a good gain stability, bandwidth of 426 MHz, baseline noise level of σ ≈ 0.6 mV, dynamic range of up to 170 mV of the input signal amplitude, good time resolution of 20 ps, and it can be comprehensively applied to SiPMs. Adopting pole-zero-cancellation in the preamplifier reduces both the rise and fall times of the SiPM signal, which can significantly improve the time resolution and reduce the pile-up when using a large SiPM or an array of SiPMs. Various combinations of the preamplifier and several types of SiPMs demonstrated time resolutions better than 50 ps for most cases; when the number of detected photons was larger than 60, a time resolution of approximately 25 ps was achieved.
Peer Review Status:
Awaiting Review
Subjects: Physics >> Nuclear Physics Subjects: Physics >> Geophysics, Astronomy, and Astrophysics submitted time 2023-09-12
Yang, Gaole
An, Zhendong
Jiang, Wei
Li,Xiankai
Qiu, Weiwei
Liao, Zhengfa
Zhuang, Ziyue
Zhang, Xiaoping
Chen,Shengli
Xiao, Erxi
Fang,Xiao
Li,XinXiang
Hu, Xinrong
Jiang, Bing
Wang, Jincheng
Ren, Jie
Luo, Wen
Zhu, ZhiChao
Lan, Haoyang
Cao, Zongwei
Abstract： The neutron capture cross sections (${n, upgamma}$) of Bromine was performed with the time-of-flight (TOF) technique at the Back-n facility of the China Spallation Neutron Source (CSNS). Prompt $ upgamma$-rays originating from neutron-induced capture events were detected by four C${}_6$D${}_6$ detectors. The pulse height weighting technique (PHWT) and the double-bunch unfolding method based on the Bayesian theory were used in the data analysis. To obtain reliable measurement results, background deductions, normalization, and corrections were carefully considered. The multilevel R-matrix Bayesian code SAMMY was used to extract the resonance parameters in the resolved resonance region (RRR). The average cross sections in unresolved resonance region the was obtained from 10 to 400 keV. The experimental results were compared with the data of several evaluated libraries and previous experiments in the resolved and unresolved resonance region. The TALYS code was used to describe the average cross sections in the unresolved resonance region. Astrophysical Maxwell average cross sections (MACSs) of ${}^{79,81}$Br from $ kT $ = 5 to 100 keV was calculated over a sufficiently wide range of neutron energies. At a thermal energy of $kT=30$ keV, the MACS value for ${}^{79}$Br 638$ pm$64 mb is in good agreement with the KADoNiS recommended value. By contrast, the value of 293$ pm$29 mb for ${}^{81}$Br is substantially higher than those of the evaluated database and the KADoNiS recommended value.
Peer Review Status:Awaiting Review
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