The low-energy antiproton beam K4 at the KEK 12 GeV proton synchrotron
The low-energy antiproton beam K4 at the KEK 12 GeV proton synchrotron
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KEK 12 GeV 质子同步加速器的低能反质子束 K4
DOI：
10.1016/0168-9002(86)90211-1
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发表时间：
1986
影响因子：
1.4
通讯作者：
M. Koike
中科院分区：
文献类型：
--
作者：
M. Takasaki;S. Kurokawa;M. Kobayashi;Mitsuhiko Taino;Y. Suzuki;H. Ishii;Y. Kato;T. Fujitani;Y. Nagashima;T. Omori;S. Sugimoto;Y. Yamaguchi;J. Iwahori;H. Yoshida;F. Takeutchi;M. Chiba;M. Koike
K4 光束设计用于传输动量范围在 0.4 至 0.8 GeV/c 之间的高强度、高纯度反质子。通过双级质量分离将反质子与不需要的π介子、μ介子和电子分离。梁的立体角动量接受率为34.1 msr% ΔP P ，梁长为28.5 m。 450、500、580和650 MeV/c处的反质子测量强度为每10 12 ppp 100、210、510和1100；相应的 π− μ− e− p 比率分别为 13.1、7.7、8.8 和 22.5。大约 45% 的 580 MeV 传入反质子在直径为 140 毫米、长度为 230 毫米的目标单元中包含的液氢中飞行时停止或湮灭。
The beam K4 is designed to transport high-intensity, high-purity antiprotons in the momentum range between 0.4 and 0.8 GeV/c. Antiprotons are separated from unwanted pions, muons, and electrons by double-stage mass separation. The solid-angle momentum acceptance of the beam is 34.1 msr% ΔP P and the beam length is 28.5 m. The measured intensities of antiprotons at 450, 500, 580 and 650 MeV/c are 100, 210, 510 and 1100 per 10 12 ppp; the corresponding π− μ− e− p ratios are 13.1, 7.7, 8.8 and 22.5, respectively. About 45% of the incomming antiprotons at 580 MeV stop or annihilate in flight in liquid hydrogen contained in a target cell with the dimension of 140 mm in diameter and 230 mm in length.