论文标题

质子和Deuteron拾音器反应2H(10BE,3HE)9li A an 2H(10BE,4HE)8LI,44 A​​ ACCULINNA-2片段分离器的MeV 10BE放射性光束

Study of Proton and Deuteron Pickup Reactions 2H(10Be,3He)9Li an 2H(10Be,4He)8Li with 44 A MeV 10Be Radioactive Beam at ACCULINNA-2 Fragment Separator

论文作者

Nikolskii, E. Yu., Krupko, S. A., Muzalevskii, I. A., Bezbakh, A. A., Wolski, R., Yuan, C., Belogurov, S. G., Biare, D., Chudoba, V., Fomichev, A. S., Gazeeva, E. M., Golovkov, M. S., Gorshkov, A. V., Grigorenko, L. V., Kaminski, G., Khirk, M., Kiselev, O., Kostyleva, D. A., Mauyey, B., Mukha, I., Parfenova, Yu. L., Quynh, A. M., Sidorchuk, S. I., Sharov, P. G., Slepnev, R. S., Stepantsov, S. V., Swiercz, A., Ter-Akopian, G. M.

论文摘要

质子和Deuteron拾音器反应2H(10BE,3HE)9LI和2H(10BE,4HE)8LI放射光束由新片段分离器Acculinna-2在Flnr,Jinr \@上产生。这些测量最初是作为用于阐明在2H(10BE,3HE)9LI和2H(10BE,4HE)8LI反应中产生的极中子的7H和6H系统中获得的结果的测试反应的动机。在2H(10BE,3HE)9LI反应中,在其激发光谱的低能源区域中鉴定了9li地下态($ 3/2^ - $),其第一个激发状态(2.69mev,$ 1/2^ - $)被鉴定出来。在前方质量中心角($ 3^\ Circ-13^\ Circ $)中提取了9li g。〜s的差分截面,并与壁画计算进行了比较。 $ \ sim 1.7 $的光谱因子是根据实验数据一致的,该模型的10BE $ = P +$ 9LI(G.S。)聚类。在2H(10BE,4HE)8LI反应中填充的8LI的能量光谱显示了强峰,这对应于8LI的第二个激发态的激发(2.25 MeV,$ 3^+$)。未观察到8LI的地面和第一个激发状态的事实与10BE g。\,s进行的壳模型计算完全一致。以及8LI级结构应用动量选择规则。

The proton and deuteron pickup reactions 2H(10Be,3He)9Li and 2H(10Be,4He)8Li radioactive beam produced by the new fragment separator ACCULINNA-2 at FLNR, JINR\@. These measurements were initially motivated as test reactions intended for the elucidation of results obtained in the study of the extremely neutron-rich 7H and 6H systems created in the 2H(10Be,3He)9Li and 2H(10Be,4He)8Li reactions using the same setup. In the 2H(10Be,3He)9Li reaction the 9Li ground-state ($3/2^-$) and its first excited state (2.69MeV, $1/2^-$) were identified in the low-energy region of its excitation spectrum. The differential cross sections for the 9Li g.~s.) population were extracted at forward center-of-mass angles ($3^\circ-13^\circ$) and compared with the FRESCO calculations. Spectroscopic factor of $\sim 1.7$, derived by a model for the 10Be$ = p +$9Li(g.s.) clustering was found in accord with the experimental data. The energy spectrum of 8Li populated in the 2H(10Be,4He)8Li reaction shows the strong peak which corresponds to excitation of the second excited state of 8Li (2.25 MeV, $3^+$). The fact that the ground and the first excited states of 8Li were not observed is fully consistent with Shell-Model calculations carried out for the 10Be g.\,s. and 8Li level structure applying momentum selection rules.

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