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arXiv 1602.00726physics.ins-detnucl-ex
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用于飞行中质子衰变实验的SHARAQ谱仪的分离流操作

Separated flow operation of the SHARAQ spectrometer for in-flight proton decay experiments

M. Dozono, T. Uesaka, S. Michimasa, M. Takaki, M. Kobayashi, M. Matsushita, S. Ota, H. Tokieda, S. Shimoura

摘要:

本文介绍了SHARAQ谱仪在飞行质子衰变实验中的一种新的工作模式--“分流模式”。在分离流模式下,质子和重离子产物被分离,并在SHARAQ的两个不同焦平面上同时测量。在$246~{\rm MeV}$上用质子束研究了该模式的离子光学特性,并根据在SHARAQ焦平面上测量的参数对动量矢量进行了适当的重构。在以$247~{\rm MeV/u}$的束能量进行$({}^{16}{\rm O},{}^{16}{\rm F})$反应的实验中,与SHARAQ一致地测量了由${}^{16}{\rm F}$的衰变产生的输出${}^{15}{\rm O}+p$。分别对$535~{\rm keV}$的相对能量和$3940~{\rm MeV}$的${}^{16}{\rm F}$能量实现了$100~{\rm keV}$(FWHM)和$\sim 2~{\rm MeV}$的高能量分辨率。

英文摘要:

New operation mode, "separated flow mode", has been developed for in-flight proton decay experiments with the SHARAQ spectrometer. In the separated flow mode, the protons and the heavy-ion products are separated and measured in coincidence at two different focal planes of SHARAQ. The ion-optical properties of the new mode were studied by using a proton beam at $246~{\rm MeV}$, and the momentum vector was properly reconstructed from the parameters measured in the focal plane of SHARAQ. In the experiment with the $({}^{16}{\rm O},{}^{16}{\rm F})$ reaction at a beam energy of $247~{\rm MeV/u}$, the outgoing ${}^{15}{\rm O}+p$ produced by the decay of ${}^{16}{\rm F}$ were measured in coincidence with SHARAQ. High energy resolutions of $100~{\rm keV}$ (FWHM) and $\sim 2~{\rm MeV}$ were achieved for the relative energy of $535~{\rm keV}$, and the ${}^{16}{\rm F}$ energy of $3940~{\rm MeV}$, respectively.

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