Towards background-free studies of capture reaction in a heavy-ion storage ring
Towards background-free studies of capture reaction in a heavy-ion storage ring
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重离子存储环中捕获反应的无背景研究
DOI：
10.1088/1742-6596/1668/1/012046
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Varga L
中科院分区：
文献类型：
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作者：
Varga L
储存和冷却的高电荷离子为原子、核结构和天体物理学领域的精确研究提供了前所未有的能力[1]。在2009年成功研究了96 Ru（p，7）97 Rh反应截面之后[2]，2016年在GSI的实验储存环（ESR）上首次测量了124 <$p（p，7）125 Cs反应截面。利用直接置于储存环超高真空环境中的双面硅条探测器，成功地探测到了~（125）Cs质子俘获产物。在伽莫夫窗口的高能尾部，在5.5 AMeV和8AMeV之间的5种不同能量下测量了截面，用于热爆炸场景，如超新星和X射线双星。H_2气体射流靶上的弹性散射是计算（p，7）事件的主要背景源。Monte Carlo模拟表明，在ESR中的一个额外的狭缝系统与Si探测器的能量信息相结合，将使背景自由测量的质子捕获产品。正在准备相应的硬件，将大大提高该方法的灵敏度。
Stored and cooled, highly-charged ions offer unprecedented capabilities for precision studies in the realm of atomic, nuclear structure and astrophysics [1]. After the successful investigation of the 96 Ru (p, 7) 97 Rh reaction cross section in 2009 [2], the first measurement of the 124 Xe (p, 7) 125 Cs reaction cross section has been performed with decelerated, fully-ionized 124 Xe ions in 2016 at the Experimental Storage Ring (ESR) of GSI [3]. Using a Double Sided Silicon Strip Detector, introduced directly into the ultra-high vacuum environment of a storage ring, the 125 Cs proton-capture products have been successfully detected. The cross section has been measured at 5 different energies between 5.5 AMeV and 8AMeV, on the high energy tail of the Gamow-window for hot, explosive scenarios such as supernovae and X-ray binaries. The elastic scattering on the H2 gas jet target is the major source of background to count the (p, 7) events. Monte Carlo simulations show that an additional slit system in the ESR in combination with the energy information of the Si detector will enable background free measurements of the proton-capture products. The corresponding hardware is being prepared and will increase the sensitivity of the method tremendously.