Experimental studies of the two-step scheme with an intense radioactive Sn132 beam for next-generation production of very neutron-rich nuclei
Experimental studies of the two-step scheme with an intense radioactive Sn132 beam for next-generation production of very neutron-rich nuclei
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用于下一代富中子核生产的强放射性 Sn132 束的两步方案的实验研究
DOI：
10.1103/physrevc.102.064615
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发表时间：
2020
影响因子：
3.1
通讯作者：
Sato, H.
中科院分区：
文献类型：
--
作者：
Suzuki, H.;Yoshida, K.;Fukuda, N.;Takeda, H.;Shimizu, Y.;Ahn, D. S.;Sumikama, T.;Inabe, N.;Komatsubara, T.;Sato, H.
对尚未开发的、中子非常丰富的、核表中中重质量区域的核的研究，包括可能存在的所有核的一半，正在导致新的和/或升级的设施，以及对潜在生产过程的研究。在本研究中，用beam研究了两步方案的有效性，这是一种生产非常富中子核的替代方法，通过同位素在线分离（ISOL）系统的组合作为第一步，再加速放射性同位素（RIs）的束内碎片化作为第二步。用278 mev /的束流撞击5.97 mm Be靶，在富中子数区周围产生了非常富中子的RIs，并测量了它们的产生截面。然后，在各自的RI-beam设施中，对1兆瓦质子和光束进行了两步方案，相对于一步方案（光束的飞行裂变）的产率进行了估计。这一比较表明，在中子非常丰富的区域，束的两步方案提供的产量比一步方案高几倍。此外，通过在ISOL的核图上使用各种RI光束，可以在超新星过程路径周围产生某些非常富含中子的RI，其产量比一步法更高。
The study of nuclei in the yet-unexplored, very neutron-rich, mid- to heavy-mass region of the nuclear chart, comprising perhaps half of all nuclei predicted to exist, is leading to new and/or upgraded facilities, as well as to research into the underlying production processes. In the present study, the usefulness of the two-step scheme, an alternate method to produce very neutron-rich nuclei, by a combination of an isotope-separation online (ISOL) system as a first step, and in-beam fragmentation of re-accelerated radioactive isotopes (RIs) as a second step, was investigated with abeam. Very neutron-rich RIs around the neutron-rich neutron numberregion were produced from the 278-MeV/nucleonbeam impinging on a 5.97-mm Be target, and their production cross sections were measured. Yields were then estimated for the two-step scheme with thebeam relative to the ones by a one-step scheme, in-flight fission of abeam, for 1-MW proton andbeams at respective RI-beam facilities. This comparison suggests that the two-step scheme with thebeam provides yields-times higher than those with the one-step scheme for the very neutron-richregion. Moreover, by using various RI beams over the nuclear chart from ISOL, certain kinds of very neutron-rich RIs around the supernova-process path can be produced with greater yields than by the one-step approach.