重离子储存环中子诱导反应截面的间接测量

M. Sguazzin, B. Jurado, J. Pibernat, J. A. Swartz, M. Grieser, J. Glorius, Y. Litvinov, R. Reifarth, K. Blaum, P. Alfaurt, P. Ascher, L. Audouin, C. Berthelot, B. Blank, B. Bruckner, S. Dellmann, I. Dillmann, C. Domingo-Pardo, M. Dupuis, P. Erbacher, M. Flayol, O. Forstner, D. Freire-Fernández, M. Gerbaux, J. Giovinazzo, S. Grévy, C. Griffin, A. Gumberidze, S. Heil, A. Heinz, D. Kurtulgil, G. Leckenby, S. Litvinov, B. Lorentz, V. Méot, J. Michaud, S. Perard, N. Petridis, U. Popp, D. Ramos, M. Roche, M. S. Sanjari, R. S. Sidhu, U. Spillmann, M. Steck, T. Stöhlker, B. Thomas, L. Thulliez, M. Versteegen
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引用次数: 0

摘要

中子诱导的不稳定核的反应截面对于理解恒星中重元素的合成和核技术的应用是必不可少的。然而,由于所涉及的目标的放射性,它们的测量非常复杂。我们建议通过使用逆运动学中的替代反应方法来规避这个问题,其中中子诱导反应中形成的核是由放射性重离子束和稳定的轻靶核的反应产生的。可以用替代反应测量γ射线发射、中子发射和裂变的化合物核激发能的函数概率,对于约束模型参数和获得感兴趣的中子诱导反应截面的更准确预测特别有用。然而,替代方法的全面发展受到许多长期存在的目标问题的阻碍,这些问题可以通过将替代反应与重离子储存环中独特且大部分未开发的可能性相结合来解决。在这篇文章中,我们描述了我们首次在GSI/FAIR设施的存储环上同时测量γ射线发射、中子发射和裂变概率的进展。特别是,我们将展示我们于2022年6月在GSI/FAIR的实验存储环(ESR)上进行的原理证明实验的第一批结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Indirect measurements of neutron-induced reaction cross sections at heavy-ion storage rings
Neutron-induced reaction cross sections of unstable nuclei are essential for understanding the synthesis of heavy elements in stars and for applications in nuclear technology. However, their measurement is very complicated due to the radioactivity of the targets involved. We propose to circumvent this problem by using the surrogate reaction method in inverse kinematics, where the nucleus formed in the neutron- induced reaction of interest is produced by a reaction involving a radioactive heavy-ion beam and a stable, light target nucleus. The probabilities as a function of the compound-nucleus excitation energy for γ-ray emission, neutron emission and fission, which can be measured with the surrogate reaction, are particularly useful to constrain model parameters and to obtain more accurate predictions of the neutron-induced reaction cross sections of interest. Yet, the full development of the surrogate method is hampered by numerous long- standing target issues, which can be solved by combining surrogate reactions with the unique and largely unexplored possibilities at heavy-ion storage rings. In this contribution, we describe the developments we are carrying out to measure for the first time simultaneously γ-ray emission, neutron emission and fission probabilities at the storage rings of the GSI/FAIR facility. In particular, we will present the first results of the proof of principle experiment, which we performed in June 2022 at the Experimental Storage Ring (ESR) of GSI/FAIR.
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