First measurement of isoscalar giant resonances in a stored-beam experiment

First measurement of isoscalar giant resonances in a stored-beam experiment
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存储光束实验中首次测量等标量巨共振

DOI:
10.1016/j.physletb.2016.10.015
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发表时间:
2016-12
期刊:
影响因子:
4.4
通讯作者:
Litvin
Litvin
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zamora J C;Aumann T;Bagchi S;Boenig S;Csatlos M;Dillmann I;Dimopoulou C;Egelhof P;Eremin V;Furuno T;Geissel H;Gernhaeuserg R;Harakeh M N;Hartig A L;Ilieva S;Kalantar Nayestanaki N;Kiselev O;Kollmus H;Kozhuharov C;Krasznahorkay A;Kroell Th;Kuilman M;Litvin

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本文介绍了一种利用储存束测量低动量转移核反应的新技术,并成功地用于等谐巨共振的研究。实验在GSI设施的实验重离子储存环(ESR)上进行,使用100 MeV/u的58 Ni束和内部氦气喷射靶。在这些测量中,非弹性散射的α反冲在非常向前的质心角(θ cm≤ 1.5°)检测到一个专用的设置,包括超高真空兼容的检测器。实验结果表明,在这个非常向前的角度范围内的等谐巨共振的主导贡献。结果发现,能量加权和规则(EWSR)的79− 11+ 12%都是由能量加权和规则(EWSR)贡献的,这与正常运动学中的测量结果一致。这为在不久的将来研究大范围不稳定和奇异核中的巨共振提供了机会。这是一个基本的里程碑,朝着新的核反应研究与存储离子束。
A new technique developed for measuring nuclear reactions at low momentum transfer with stored beams in inverse kinematics was successfully used to study isoscalar giant resonances. The experiment was carried out at the experimental heavy-ion storage ring (ESR) at the GSI facility using a stored 58 Ni beam at 100 MeV/u and an internal helium gas-jet target. In these measurements, inelastically scattered α-recoils at very forward center-of-mass angles (θ cm≤ 1.5°) were detected with a dedicated setup, including ultra-high vacuum compatible detectors. Experimental results indicate a dominant contribution of the isoscalar giant monopole resonance at this very forward angular range. It was found that the monopole contribution exhausts 79− 11+ 12% of the energy-weighted sum rule (EWSR), which agrees with measurements performed in normal kinematics. This opens up the opportunity to investigate the giant resonances in a large domain of unstable and exotic nuclei in the near future. It is a fundamental milestone towards new nuclear reaction studies with stored ion beams.
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