Journal of Neutron Research最新文献_第2页

Current development status of iBNCT001, demonstrator of a LINAC-based neutron source for BNCT 用于BNCT的基于LINAC的中子源演示器iBNCT001的发展现状

IF 1.1

Journal of Neutron Research Pub Date : 2023-01-11 DOI: 10.3233/jnr-220029

H. Kumada, Yinuo Li, K. Yasuoka, F. Naito, T. Kurihara, T. Sugimura, M. Sato, Y. Matsumoto, Akira Matsumura, Hideki Sakurai, T. Sakae

{"title":"Current development status of iBNCT001, demonstrator of a LINAC-based neutron source for BNCT","authors":"H. Kumada, Yinuo Li, K. Yasuoka, F. Naito, T. Kurihara, T. Sugimura, M. Sato, Y. Matsumoto, Akira Matsumura, Hideki Sakurai, T. Sakae","doi":"10.3233/jnr-220029","DOIUrl":"https://doi.org/10.3233/jnr-220029","url":null,"abstract":"The iBNCT project aims to develop “iBNCT001,” a demonstration device of the linac-based neutron irradiation facility for boron neutron capture therapy (BNCT) application. iBNCT001 generates an epithermal neutron beam by irradiating 8 MeV protons accelerated by a linac onto a beryllium target. Currently, the linac can drive an average proton current of 2.1 mA. Several experiments were performed using a water phantom to confirm the main physical characteristics of the neutron beam produced at the irradiation position. The measurement results demonstrated that the maximum thermal neutron flux achievable in the phantom volume was approximately 1.36 × 10 9 cm − 2 s − 1 when a normal beam collimator with a 120 mm diameter was used. This neutron beam intensity was sufficient to complete the irradiation within 30 min using the BNCT approach. In addition to normal beam collimators, extended collimators that protrude 100 mm from the wall were developed. By using an extended collimator, it is possible to prevent interference of the patient’s body with the wall when irradiating head and neck cancers. The measurement results for the extended collimator demonstrated that irradiation with the collimator could be completed within 1 h when the neutron beam is generated with an average proton current of 2.1 mA.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43353404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Liquid Helium as a reference may provide clarity for some neutron reflectometry experiments1 液氦作为参考可以为一些中子反射计实验提供清晰度1

IF 1.1

Journal of Neutron Research Pub Date : 2023-01-11 DOI: 10.3233/jnr-220041

T. Charlton, E. Guo, N. Lavrik, M. Fitzsimmons

引用次数: 0

Workshop on very cold and ultra cold neutron sources for ESS 极冷和超冷中子源ESS研讨会

Journal of Neutron Research Pub Date : 2023-01-05 DOI: 10.3233/jnr-220047

Valentina Santoro, Markus Strobl, Luca Zanini, Oliver Zimmer

引用次数: 0

In-beam superfluid-helium ultracold neutron source for the ESS ESS的束流超氦超冷中子源

IF 1.1

Journal of Neutron Research Pub Date : 2023-01-05 DOI: 10.3233/jnr-220045

O. Zimmer, T. Bigault, S. Degenkolb, Christoph Herb, Thomas Neulinger, N. Rizzi, V. Santoro, A. Takibayev, R. Wagner, L. Zanini

{"title":"In-beam superfluid-helium ultracold neutron source for the ESS","authors":"O. Zimmer, T. Bigault, S. Degenkolb, Christoph Herb, Thomas Neulinger, N. Rizzi, V. Santoro, A. Takibayev, R. Wagner, L. Zanini","doi":"10.3233/jnr-220045","DOIUrl":"https://doi.org/10.3233/jnr-220045","url":null,"abstract":"This paper discusses design principles and possible performances of an “in-beam” ultracold neutron (UCN) source for the European Spallation Source (ESS). The key components of the proposed neutron delivery system are nested-mirror optics (NMO), which image the bright neutron emission surface of the large liquid-deuterium moderator, studied within the HighNESS project, onto a remotely located superfluid-helium converter. Bandpass supermirrors, with optional polarization capability, enable the selective transport of those neutrons that are most effective for UCN production, exploiting the single-phonon conversion process that is possible for neutrons having wavelengths within a narrow range centered on 8.9 A ˚. NMO are capable of extracting and refocusing neutrons with small transport losses under the large solid angle available at the ESS Large Beam Port (LBP), allowing the converter to be placed far away from the high-radiation area in the ESS shielding bunker, where the source stays accessible for trouble-shooting while facilitating a low-background environment for nearby UCN experiments. Various configurations of the beam and converter are possible, including a large-volume converter – with or without a magnetic reflector – for a large total UCN production rate, or a beam focused onto a small converter for highest possible UCN density. The source performances estimated by first simulations of a baseline version presented in this paper, including a saturated UCN density on the order of 10 5 cm − 3 , motivate further study and the development of NMO beyond the first prototypes that have been recently investigated experimentally.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45810437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Approaches to high-density storage experiments with in-situ production and detection of ultracold neutrons 超冷中子原位产生和探测的高密度储存实验方法

IF 1.1

Journal of Neutron Research Pub Date : 2023-01-05 DOI: 10.3233/jnr-220044

S. Degenkolb, P. Fierlinger, O. Zimmer

{"title":"Approaches to high-density storage experiments with in-situ production and detection of ultracold neutrons","authors":"S. Degenkolb, P. Fierlinger, O. Zimmer","doi":"10.3233/jnr-220044","DOIUrl":"https://doi.org/10.3233/jnr-220044","url":null,"abstract":"Low counting statistics is one of the most important challenges in modern experiments with ultracold neutrons (UCN). UCN densities in superthermal sources based on superfluid helium are normally much higher than those after UCN delivery to ex-situ volumes. Therefore, and due to the vanishing neutron absorption of 4He, storage-based experiments performed in-situ promise significant sensitivity gains. Scalable measurements offer a promising path to simultaneously address the inefficient use of cold neutron beams as precursors for UCN production in 4He, by recuperating the unused beam fraction, and confront the practical challenges of large-scale UCN infrastructure. We suggest strategies for the development of modular cryogenic cells, propose a novel approach for in-situ UCN detection, and discuss the ultimate statistical reach of such a multiplexed experiment for measuring the neutron’s permanent electric dipole moment (EDM). While dedicated research and development are needed to evaluate the feasibility for many requirements, a neutron EDM measurement with sensitivity well beyond 10 − 28 e cm seems possible. Such an experiment could be pursued at any compatible cold neutron beamline, e.g., at the Institut Laue–Langevin, or later using the ANNI facility or large beam port (LBP) at the European Spallation Source.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42189840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Neutron performance and future prospect of the compact electron accelerator-driven neutron facility AISTANS AISTANS小型电子加速器驱动中子装置的中子性能及未来展望

IF 1.1

Journal of Neutron Research Pub Date : 2023-01-02 DOI: 10.3233/jnr-220022

K. Kino, T. Fujiwara, M. Furusaka, T. Muroga, B. O’Rourke, N. Oshima, Y. Tomota

引用次数: 0

Editorial Proc. UCANS IX Online Conference, March 28–31, 2022 编辑过程。UCNS IX在线会议，2022年3月28日至31日

IF 1.1

Journal of Neutron Research Pub Date : 2022-12-30 DOI: 10.3233/jnr-220048

D. Baxter, T. Gutberlet, K. Kino, Y. Kiyanagi, Hiroaki Kumada, Y. Otake, Masato Takamura, Xuewu Wang

引用次数: 0

VITA high flux neutron source for various applications 适用于各种应用的VITA高通量中子源

IF 1.1

Journal of Neutron Research Pub Date : 2022-12-13 DOI: 10.3233/jnr-220020

M. Bikchurina, Tymofey Bykov, E. Byambatseren, Ibrahem K. Ibrahem, D. Kasatov, I. Kolesnikov, V. Konovalova, A. Koshkarev, A. Makarov, G. Ostreinov, S. Savinov, E. Sokolova, I. Sorokin, I. Shchudlo, T. Sycheva, G. Verkhovod, S. Taskaev

引用次数: 0

Estimation of double-differential cross-sections of 9Be(p,xn) reaction for new nuclear data library JENDL-5 新核数据库JENDL-5中9Be（p，xn）反应双微分截面的估计

IF 1.1

Journal of Neutron Research Pub Date : 2022-12-13 DOI: 10.3233/jnr-220019

S. Kunieda, Kazuyoshi Yamamoto, C. Konno, Y. Iwamoto, O. Iwamoto, Y. Wakabayashi, Yujiro Ikeda

引用次数: 1

Development of a pulse-width-discriminating 3He position-sensitive detector system 脉宽鉴别3He位置灵敏探测系统的研制

IF 1.1

Journal of Neutron Research Pub Date : 2022-12-13 DOI: 10.3233/jnr-220016

Setsuo Sato, R. Kajimoto, Y. Inamura

{"title":"Development of a pulse-width-discriminating 3He position-sensitive detector system","authors":"Setsuo Sato, R. Kajimoto, Y. Inamura","doi":"10.3233/jnr-220016","DOIUrl":"https://doi.org/10.3233/jnr-220016","url":null,"abstract":"In many neutron scattering experiments, 3He-gas position-sensitive detectors (PSDs) are employed to obtain high-quality data. However, the exact position where a neutron is detected cannot be determined if two or more neutrons are simultaneously captured at different positions. This results in noise and degrades the quality of the data. In particular, such noise is a serious source of spurious scattering in inelastic neutron scattering instruments equipped with a large number of long PSDs recently developed at pulsed neutron sources. Herein, we introduce a pulse-width-discriminating PSD system that monitors the pulse width and height of the collected data. The system utilizes previously developed neutron-readout boards and removes instances of two or more simultaneous captures from the data to significantly improve the performance of PSDs. We also propose a new program to monitor the pulse width from PSD data using a hardware function implemented for other purposes. We confirm that the noise decreases to a level almost equal to that of the background. Although the developed program is applied to an inelastic scattering experiment, it is applicable to other types of experiments in which mispositioned signals should be eliminated as noise.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44740659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0