Single-Volume Neutron Scatter Camera for High-Efficiency Neutron Imaging and Spectroscopy
Joshua Braverman, James Brennan, Erik Brubaker, Belkis Cabrera-Palmer, Steven Czyz, Peter Marleau, John Mattingly, Aaron Nowack, John Steele, Melinda Sweany, Ky… 展开作者
Joshua Braverman, James Brennan, Erik Brubaker, Belkis Cabrera-Palmer, Steven Czyz, Peter Marleau, John Mattingly, Aaron Nowack, John Steele, Melinda Sweany, Kyle Weinfurther, Eli Woods
Neutron detection provides an effective method to detect, locate, and characterize sources of interest to nuclear security applications. Current neutron imaging systems based on double-scatter kinematic reconstruction provide good signal vs. background discrimination and spectral capability, but suffer from poor sensitivity due to geometrical constraints. This weakness can be overcome if both neutron-proton scattering interactions are detected and resolved within one large contiguous active detector volume. We describe here a maximum likelihood approach to event reconstruction in a single-volume system with no optical segmentation and sensitivity to individual optical photons on the surfaces of the scintillator. We present results from a Geant4-based simulation establishing the feasibility of this single-volume neutron scatter camera concept given notional performance of existing photodetector and readout technologies.
A portable neutron scatter camera with isotropic sensitivity
University of Chicago（芝加哥大学）；Donostia International Physics Center（多诺西亚国际物理中心）；BERC Basque Excellence Research Centre（巴斯克卓越研究中心）；University of the Basque Country UPV/EHU（巴斯克地区大学）；Ikerbasque, Basque Foundation for Science（伊克尔巴斯科，巴斯克科学基金会）；IDOM Consulting, Engineering, Architecture, S.A.U.（IDOM咨询、工程、建筑股份公司）
A Neutron Spin-Echo Concept for Elastic Scattering Spectroscopy (ESS) for Dynamics of Complex (Bio-) Systems
最近，一种新的中子能谱的动力学在复杂的（生物）系统已被提出[A。Benedetto和G. J. Kearley，Sci. Rep. 6，34266，（2016）]。这种光谱学是理想的，其中仅需要以无参数方式的总弛豫时间，例如在复杂系统中，因为仅需要作为能量分辨率的函数的弹性散射强度。这被称为“弹性散射光谱”（ESS）。它是基于在对应于整个系统的弛豫时间的能量分辨率值的弹性散射强度的拐点。一个恒定波长（CW）的选项，更适合于反应堆源，和飞行时间（TOF）的选项，更适合于spiritual源，已经提出，在这里，我们研究的概念的第三个选项的基础上，中子自旋回波（NSE），称为ESS-NSE。原则上，这包括简单地测量相对强烈的弹性回波条件下的去极化，作为分辨率的函数，基本设置与标准自旋回波相似。在其基本设置中，ESS自旋回波可以访问从纳秒到几十皮秒的5个数量级的时间，达到比最近提出的CW和TOF选项更慢的弛豫过程。然而，空间聚焦对于生物系统的小样本尺寸是重要的，因此我们还探索了如何使小中子束能够聚焦在样本上的场。
