New segmented target for studies of neutron unbound systems

New segmented target for studies of neutron unbound systems
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用于中子自由系统研究的新分段目标

DOI:
10.1016/j.nima.2020.164284
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发表时间:
2020
期刊:
Detectors and Associated Equipment
影响因子:
--
通讯作者:
Persch, C.
Persch, C.
中科院分区:
--
文献类型:
--
作者:
Redpath, T.;Baumann, T.;Brown, J.;Chrisman, D.;DeYoung, P.A.;Frank, N.;Guèye, P.;Kuchera, A.N.;Liu, H.;Persch, C.

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用不变质谱学研究非束缚中子系统通常是用低强度放射性离子束进行的。低的反应产率可以通过使用厚靶来抵消,但代价是重建的不变质量中有更大的不确定性。我们提出了一种新的分段目标,旨在解决这种权衡。它由三个∼4 mm厚的被动铍靶组成,这些靶交错在四个140μm厚的位置敏感硅探测器之间。在使用这一新系统的第一次实验中,测得双中子非束缚26 O的半衰期为T1/2=5.0−2.2+1.7(STAT)±1.7(SST)ps,这与Mona合作者先前的测量结果一致。
The study of neutron-unbound systems using invariant mass spectroscopy is often performed using low-intensity radioactive ion beams. Low reaction yields can be countered by using thick targets but at the expense of larger uncertainties in the reconstructed invariant mass. We present a new segmented target designed to address this trade-off. It is composed of three∼ 4 mm thick passive beryllium targets interleaved between four 140 μ m thick position sensitive silicon detectors. In the first experiment to use this new system the half-life of two-neutron unbound 26 O was measured to be T 1∕ 2= 5. 0− 2. 2+ 1. 7 (stat)±1. 7 (syst) ps, which agrees with a previous measurement made by the MoNA Collaboration.
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