The LiNA experiment: Development of multi-layered time projection chamber
The LiNA experiment: Development of multi-layered time projection chamber
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LiNA 实验：多层时间投影室的开发
DOI：
10.1016/j.nima.2022.167586
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
T. Yoshioka
中科院分区：
文献类型：
--
作者：
N. Sumi;G. Ichikawa;K. Mishima;Y. Makida;M. Kitaguchi;S. Makise;S. Matsuzaki;T. Nagano;M. Tanida;H. Uehara;K. Yano;H. Ototno;T. Yoshioka
中子寿命是粒子物理学和宇宙学的一个重要参数。目前已有两种测量方法，但结果与4.6 σ不一致。在J-PARC进行的束法中，中子束通过气体探测器时间投影室（TPC）。TPC通过3he (n, p) 3h反应计算一个衰变电子和一个中子通量。然而，实验结果仍有很大的不确定性。造成不确定性的两个最大因素是本底污染和信号切割效率低下。为了克服这些问题，提出了一种新的实验，即LiNA实验。该系统抑制来自探测器壁的背景事件，并通过施加平行于光束轴的均匀磁场来提高信号切割效率。由九州大学研制的三漂移层探测器系统。在KEK进行了探测器和磁体集成试验。在探测器的中心安装了β射线源来模拟中子β衰变电子。在探测器侧面安装了γ射线源，以评价磁场对背景的抑制作用。证实了在信号区β射线被限制，而γ射线背景被抑制在3%以内。该系统在J-PARC进行了30天的中子寿命测量，测量精度达到0.2%。
The neutron lifetime is an important parameter for particle physics and cosmology. There are two types of measurement methods carried out so far, but their results are in disagreement with 4.6 σ. In the beam method carried out at J-PARC, a neutron bunch passes through a gaseous detector Time Projection Chamber (TPC). The TPC counts a beta decay electron and a neutron flux by 3 He (n, p) 3 H reaction. However, the result of this experiment still has large uncertainty. The largest two contributions to the uncertainty are background contamination and signal cut inefficiency. A new experiment, the LiNA experiment, was proposed to overcome the problems. This system suppresses background events that come from the detector wall and improves signal cut efficiency by applying a uniform magnetic field in parallel to the beam axis. The detector system which has three drift layers was developed at Kyushu University. The detector and magnet integration tests were carried out at KEK. The β-ray source was installed in the center of the detector to imitate the neutron beta decay electron. The γ-ray source was installed on the side of the detector to evaluate background suppression with the field. It was confirmed that β-ray is confined while γ-ray background is suppressed to 3% in the signal region. This system can measure the neutron lifetime with an accuracy of 0.2% by 30 days measurement at J-PARC.
J-PARC 使用脉冲冷中子束测量中子寿命
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
Hitomi Collaboration;Aya Bamba;et al.;Sei Ieki
通讯作者：
Sei Ieki
用于粒子天体物理学的薄型超导螺线管的气球化
影响因子：
1.8
作者：
Y. Makida;K. Anraku;Junichi Suzuki;Akira Yamamoto;M. Imori;T. Yoshida;K. Yoshimura;I. Ueda;T. Saeki;H. Matsunaga;S. Orito;M. Motoki;M. Nozaki;Nobuyuki Yajima;D. Righter
通讯作者：
D. Righter