Production and measurement of a stellar neutron spectrum at 30 keV

IF 2.6 3区 物理与天体物理 Q2 PHYSICS, NUCLEAR
Javier Praena, Antònia Verdera, Javier García López, Guido Martín-Hernández
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引用次数: 0

Abstract

A few years ago, we theoretically studied the production of a stellar neutron spectrum at kT = 30 keV using a shaped proton beam impinging on a thick lithium target. Here, we first measure the proton distribution to better control the produced neutron spectrum. Then, we measure the forward-emitted angle-integrated neutron spectrum of the 7Li(p,n)7Be reaction via time-of-flight neutron spectrometry with such proton distribution. The result resembles a stellar neutron spectrum at kT = 30 keV. This method avoids in activation experiments the need for spectrum correction. In the case of spherical samples, no knowledge of the cross-section of the isotope being measured by activation would be necessary. Therefore, the present method is of interest for isotopes with unknown or poorly known cross-sections, such as branching points in astrophysics. The key point of our method is the experimental control of the proton distribution that impinges on the lithium target.

30 千电子伏恒星中子谱的产生与测量
几年前,我们从理论上研究了在 kT = 30 keV 的条件下,利用撞击在厚锂靶上的定形质子束产生恒星中子谱的过程。在这里,我们首先测量质子分布,以便更好地控制产生的中子谱。然后,我们利用这种质子分布,通过飞行时间中子谱仪测量 7Li(p,n)7Be 反应的前向发射角积分中子谱。结果类似于 kT = 30 keV 的恒星中子谱。这种方法避免了在活化实验中进行光谱校正的需要。在球形样品的情况下,无需了解活化测量同位素的横截面。因此,本方法适用于横截面未知或知之甚少的同位素,如天体物理学中的分支点。我们方法的关键点在于对撞击锂靶的质子分布进行实验控制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
The European Physical Journal A
The European Physical Journal A 物理-物理:核物理
CiteScore
5.00
自引率
18.50%
发文量
216
审稿时长
3-8 weeks
期刊介绍: Hadron Physics Hadron Structure Hadron Spectroscopy Hadronic and Electroweak Interactions of Hadrons Nonperturbative Approaches to QCD Phenomenological Approaches to Hadron Physics Nuclear and Quark Matter Heavy-Ion Collisions Phase Diagram of the Strong Interaction Hard Probes Quark-Gluon Plasma and Hadronic Matter Relativistic Transport and Hydrodynamics Compact Stars Nuclear Physics Nuclear Structure and Reactions Few-Body Systems Radioactive Beams Electroweak Interactions Nuclear Astrophysics Article Categories Letters (Open Access) Regular Articles New Tools and Techniques Reviews.
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