Nuclear Instruments and Methods in Physics Research最新文献_第10页

Gamma spectroscopy at high counting rates with large volume germanium detectors 高计数率的伽马光谱与大体积锗探测器

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91346-2

Nello Taccetti

引用次数: 3

An empirical correction for dead-time and pulse pile-up losses in gamma-ray spectrometry 伽玛射线能谱中死区时间和脉冲堆积损失的经验校正

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91347-4

Muyoba Macwani

引用次数: 1

New fast organic scintillators using intramolecular bromine quenching 分子内溴猝灭的新型快速有机闪烁体

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91340-1

I.B. Berlman , S.S. Lutz, J.M. Flournoy, C.B. Ashford, L.A. Franks, P.B. Lyons

{"title":"New fast organic scintillators using intramolecular bromine quenching","authors":"I.B. Berlman , S.S. Lutz, J.M. Flournoy, C.B. Ashford, L.A. Franks, P.B. Lyons","doi":"10.1016/0167-5087(84)91340-1","DOIUrl":"10.1016/0167-5087(84)91340-1","url":null,"abstract":"<div>Organic scintillator solutions with decay times as fast as 500 ps and with relatively high conversion efficiencies have been developed. The intramolecular quenching was achieved through the novel approach of adding a bromine atom to the 3- or 4-position of para-oligophenylenes, the fluorescent solutes in these binary solutions. The bromine serves to enhance singlet-to-triplet intersystem crossing in the chromophore, causing a reduction in the scintillation yield and a conconitant reduction in the decay time. The very fast value given above probably also involves some intermolecular self-quenching at high concentration. In addition, the bromine reduces the symmetry of the molecules, thereby increasing their solubility. Finally, an alkyl chain on the opposite para position further increases the solubility and also increases the immunity of the chromophore to quenching.The following solutes were studied in binary liquid solutions and to a limited extent in plastics: 4-bromo-4″-(5-hexadecyl)-p-terphenyl: (4-BHTP), 3-bromo-4″-(5-hexadecyl)-p-terphenyl: (3-BHTP), 4-bromo-p-terphenyl: (4-BTP), 3-bromo-p-terphenyl: (3-BTP), 4-bromo-4‴-(5-hexadecyl)-p-quaterphenyl: (4-BHQP). The decay times for binary liquid solutions in toluene (at the indicated concentrations) were 0.51 ns for 4-BHTP (0.14 M), 0.75 ns for 3-BHTP (0.14 M), 0.57 ns for 3-BTP (0.14 M), and 1.3 ns for 4-BHQP (0.06 M). Binary plastics with 4-BHTP as the solute in concentrations up to 0.14 M were cast in polystyrene. The shortest decay time, 0.40 ns, was measured for the 0.14 M concentration. A plastic scintillator containing 3-BTP (0.11 M in polystyrene) had a decay time of 0.85 ns. These results compare favorably with the plastic scintillator BC-422 whose decay time is about 1.4 ns.</div>","PeriodicalId":100972,"journal":{"name":"Nuclear Instruments and Methods in Physics Research","volume":"225 1","pages":"Pages 78-82"},"PeriodicalIF":0.0,"publicationDate":"1984-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-5087(84)91340-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81570461","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: 4

Effect of the Mott cross section on charge identification in the HEAO-3 heavy cosmic ray experiment Mott截面对HEAO-3重宇宙射线实验中电荷识别的影响

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91357-7

J.H. Derrickson, P.B. Eby, J.W. Watts Jr.

引用次数: 0

Conceptual design for a high resolution high rate vertex detector for charm and beauty experiments using scintillating fibre optics 用于魅力和美容实验的高分辨率高速率顶点检测器的概念设计

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91330-9

M. Atkinson, D. Crennell, C. Fisher, N. Kurtz

引用次数: 8

Simulation of HgI2 semiconductor detectors by a Monte Carlo method 用蒙特卡罗方法模拟HgI2半导体探测器

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91350-4

C. Manfredotti, U. Nastasi

引用次数: 9

42 MeV bremsstrahlung spectrum analysis by a photoactivation method 光活化法分析42兆电子伏轫致辐射谱

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91360-7

Alfonso Calzado , Eliseo Vañó , Victor Delgado , Luciano González

引用次数: 3

Position sensitive and Bragg curve spectroscopy detector system 位置敏感和布拉格曲线光谱检测系统

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91337-1

Arialdo Moroni , Ileana Iori , Li Zu Yu , Gianfranco Prete , Giuseppe Viesti , Fabiana Gramegna , Antonio Dainelli

{"title":"Position sensitive and Bragg curve spectroscopy detector system","authors":"Arialdo Moroni , Ileana Iori , Li Zu Yu , Gianfranco Prete , Giuseppe Viesti , Fabiana Gramegna , Antonio Dainelli","doi":"10.1016/0167-5087(84)91337-1","DOIUrl":"10.1016/0167-5087(84)91337-1","url":null,"abstract":"<div>A heavy ion gas detector system consisting of a Bragg-curve spectroscopy ionization chamber for particle identification and a multiwire proportional chamber as position sensitive fast trigger device is described. The Bragg IC has been tested with several beams up to Z = 36 to investigate some aspects of the BCS method. Results are reported on energy resolution and linearity, Z resolving power and mass sensitivity. The energy resolution is well below 1%. The Bragg-peak amplitude is fairly independent of the energy in a wide energy range and single elements are identified up to Z = 38 with a resolving power Z/ΔZ − 50-80. Isotope identification by range measurement is limited by the straggling in the ionization process and the mass resolving power is M/ΔM ∼ 20–26 for S and Si isotopes. The MWPC allows subnanosecond time resolution and position identification along the in-plane coordinate within ±0.5 mm.</div>","PeriodicalId":100972,"journal":{"name":"Nuclear Instruments and Methods in Physics Research","volume":"225 1","pages":"Pages 57-64"},"PeriodicalIF":0.0,"publicationDate":"1984-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-5087(84)91337-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89807292","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: 28

Fitting of exponentials 指数拟合

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91365-6

B. Potschwadek

引用次数: 1

Measurement system for alpha emitters in solution 溶液中α发射器的测量系统

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91356-5

A. Robert, C. Sella, R. Heindl

引用次数: 8