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University of Lund

1. Scherzinger, Julius. Neutron Irradiation Techniques.

Degree: 2016, University of Lund

The He-3 “crisis” has become a fact in the last decade and large scale neutron detectors based on He-3 technologies have become unaffordable. This new He-3 reality has resulted in a major effort worldwide to develop replacement neutron-detector technologies. Many of these technologies are in their infancy and need to be thoroughly tested before becoming mainstream, while others are approaching commercialization and need to be certified. Still others which are commercially available today need to be tested before being installed in, for example, the instruments at the European Spallation Source ERIC. Detector technologies in all three stages of development need neutrons for controlled irradiations. Sources of neutrons for controlled irradiations include accelerators, nuclear reactors and radioactive sources. Neutrons produced in nuclear reactors and at accelerators have a very high cost of entry and a very high cost per neutron. In contrast, radioactive sources produce neutrons with a significantly lower cost of entry and lower cost per neutron. A drawback associated with radioactive sources is the associated isotropic mixed neutron/gamma-ray field. The Source Testing Facility has been established at the Division of Nuclear Physics at Lund University to provide a source-based neutron irradiation facility to local academic users and industry. This work presents the development of a cost-efficient test bed for the production of 2-6 MeV neutrons, an integral part of the Source Testing Facility. The test bed is based on actinide/9Be sources and lowers the barrier for local groups for precision neutron testing of detector technologies and shielding studies. Well-understood nuclear physics coincidence and time-of-flight measurement techniques are applied to unfold the mixed neutron/gamma-ray field and unambiguously identify the energies of the neutrons on an event-by-event basis. The Source Testing Facility thus developed is then used in conjunction with Arktis Radiation Detectors of Zurich, Switzerland for benchmarking the response of next generation He-4 based neutron detectors against standard NE-213 liquid scintillator detectors. The response of these standard NE-213 liquid scintillator detectors is then carefully unfolded and various models of the response of the scintillator itself are tested. The outputs of different actinide/Be-9 sources are then precisely compared in an effort to identify preferred actinides. And lastly, a complementary facility for the tagging of neutrons from the spontaneous-fission source Cf-252 is developed as a first step towards providing users the capability to measure the absolute, fast-neutron detection efficiency of their devices.

Subjects/Keywords: Physical Sciences; actinide/Be; fast-neutrons; NE-213 liquid scintillator; He-4 scintillators; pulse-shape discrimination; Cf-252; absolute detection efficiency; neutron irradiation; Fysicumarkivet A:2016:Scherzinger

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Scherzinger, J. (2016). Neutron Irradiation Techniques. (Doctoral Dissertation). University of Lund. Retrieved from https://lup.lub.lu.se/record/d4c447d5-ee52-49a9-ad55-4669aed57e32 ; https://portal.research.lu.se/ws/files/17144255/PhD_Thesis_JuliusScherzinger.pdf

Chicago Manual of Style (16th Edition):

Scherzinger, Julius. “Neutron Irradiation Techniques.” 2016. Doctoral Dissertation, University of Lund. Accessed April 15, 2021. https://lup.lub.lu.se/record/d4c447d5-ee52-49a9-ad55-4669aed57e32 ; https://portal.research.lu.se/ws/files/17144255/PhD_Thesis_JuliusScherzinger.pdf.

MLA Handbook (7th Edition):

Scherzinger, Julius. “Neutron Irradiation Techniques.” 2016. Web. 15 Apr 2021.

Vancouver:

Scherzinger J. Neutron Irradiation Techniques. [Internet] [Doctoral dissertation]. University of Lund; 2016. [cited 2021 Apr 15]. Available from: https://lup.lub.lu.se/record/d4c447d5-ee52-49a9-ad55-4669aed57e32 ; https://portal.research.lu.se/ws/files/17144255/PhD_Thesis_JuliusScherzinger.pdf.

Council of Science Editors:

Scherzinger J. Neutron Irradiation Techniques. [Doctoral Dissertation]. University of Lund; 2016. Available from: https://lup.lub.lu.se/record/d4c447d5-ee52-49a9-ad55-4669aed57e32 ; https://portal.research.lu.se/ws/files/17144255/PhD_Thesis_JuliusScherzinger.pdf

2. Suita, Julio Cezar. Medidas de seções de choque de reações induzidas por nêutrons rápidos.

Degree: 1994, Instituto de Engenharia Nuclear; Programa de Pós-Graduação em Física; IEN; Brasil; Universidade Federal do Rio de Janeiro

Submitted by Marcele Costal de Castro ([email protected]) on 2017-09-27T17:33:25Z No. of bitstreams: 1 JULIO CESAR SUITA D.pdf: 3971978 bytes, checksum: 60e4fc95f134a5c7fee28b0a90ec6b74 (MD5)

Made available in DSpace on 2017-09-27T17:33:25Z (GMT). No. of bitstreams: 1 JULIO CESAR SUITA D.pdf: 3971978 bytes, checksum: 60e4fc95f134a5c7fee28b0a90ec6b74 (MD5) Previous issue date: 1994-01

Foram feitas medidas de seções de choque das reações 58Ni(n,p) 58Co, 59Co(n,p) 59Fe, 51 V(n,α) 49Sc e 59Co(n,2n) 59Co, e de razões isoméricas do 59Co na faixa de energia de nêutrons entre 9 e 14 MeV. São apresentados os arranjos experimentais desenvolvidos para a realização dessas medidas e o processo de obtenção e análise dos dados. Os resultados obtidos são comparados com medidas anteriores e com a curva teórica calculada com o auxilio do código GNASH, apontado como o mais adequado para a região de energia e massa estudadas. Em geral os resultados experimentais são mais baixos que os calculados.

Cross sections for the 58Ni(n,p) 58Co, 59Co(n,p) 59Fe, 51 V(n,α) 48Sc e 59Co(n,2n) 58Co reactions, and isomeric ratio in 58Co were measured in the neutron energy range from 9 to 14 MeV. The experimental arrangements set up for these measurements are presented together with the data aquisition and analysis procedures. The results are compared with earlier measurements as well as the theoretical calculations performed by the GNASH code, which is known as the most suitable for this energy and mass regions. In general, the experimental results are lower than the theoretical ones.

Advisors/Committee Members: Barros, Solange de, Silva, Arthur Gerbasi da, Donangelo, Raul José, Marechal, Bernard Marie, Gonçalves, Odair Dias, Barross, Solange de.

Subjects/Keywords: Seções de choque; Neutrons rápidos; Reações nucleares; Detector NE-213; Código FANTI

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APA (6th Edition):

Suita, J. C. (1994). Medidas de seções de choque de reações induzidas por nêutrons rápidos. (Doctoral Dissertation). Instituto de Engenharia Nuclear; Programa de Pós-Graduação em Física; IEN; Brasil; Universidade Federal do Rio de Janeiro. Retrieved from http://carpedien.ien.gov.br:8080/handle/ien/1936

Chicago Manual of Style (16th Edition):

Suita, Julio Cezar. “Medidas de seções de choque de reações induzidas por nêutrons rápidos.” 1994. Doctoral Dissertation, Instituto de Engenharia Nuclear; Programa de Pós-Graduação em Física; IEN; Brasil; Universidade Federal do Rio de Janeiro. Accessed April 15, 2021. http://carpedien.ien.gov.br:8080/handle/ien/1936.

MLA Handbook (7th Edition):

Suita, Julio Cezar. “Medidas de seções de choque de reações induzidas por nêutrons rápidos.” 1994. Web. 15 Apr 2021.

Vancouver:

Suita JC. Medidas de seções de choque de reações induzidas por nêutrons rápidos. [Internet] [Doctoral dissertation]. Instituto de Engenharia Nuclear; Programa de Pós-Graduação em Física; IEN; Brasil; Universidade Federal do Rio de Janeiro; 1994. [cited 2021 Apr 15]. Available from: http://carpedien.ien.gov.br:8080/handle/ien/1936.

Council of Science Editors:

Suita JC. Medidas de seções de choque de reações induzidas por nêutrons rápidos. [Doctoral Dissertation]. Instituto de Engenharia Nuclear; Programa de Pós-Graduação em Física; IEN; Brasil; Universidade Federal do Rio de Janeiro; 1994. Available from: http://carpedien.ien.gov.br:8080/handle/ien/1936

3. Turko, Joseph. Detector Response Simulations of Hydrocarbon Neutron Scintillators.

Degree: MS, Department of Physics, 2017, University of Guelph

DESCANT is a novel neutron detector array for use in nuclear structure and astrophysics studies with radioactive-ion beams. Comprised of 70 hexagonical deuterated scintillation detectors, DESCANT is located at the ISAC facility of TRIUMF, where it can be used in combination with the GRIFFIN or TIGRESS gamma-ray spectrometers in a multitude of nuclear decay and reaction experiments. The deuterated scintillator used in the DESCANT detectors produces a peaked structure in the detector response spectra that can provide neutron energy measurements without using traditional time-of-flight methods. This thesis will present the framework for a comprehensive GEANT4 simulation of the DESCANT array. The capabilities of the G4NeutronHP physics library in accurately reproducing interaction cross-sections below 10 MeV is verified. The G4Scintillation model is then used to investigate the geometric dependence of the light collection process in a single DESCANT detector. This is followed by an extensive study of simulated response functions of two neutron scintillators. The first is a well studied proton-recoil scintillator (NE-213) and the second is a deuteron-recoil scintillator (EJ-315), similar to that which is used by DESCANT. The detector response to mono-energetic neutrons is then measured for the two scintillators using cylindrical detectors with 11.43 cm diameter and 2.54 cm thickness geometries. A parameterization of the light yield is then calculated for both scintillators by conducting a chi-squared minimization between experimental and simulated pulse-height spectra. Finally, the current status of the DESCANT array geometry in GEANT4 is presented. Advisors/Committee Members: Garrett, Paul (advisor).

Subjects/Keywords: Neutron detectors; Detector response function; NE-213; EJ-315; DESCANT; Nuclear physics; Deuterated scintillators; Neutron scintillators; GEANT4; Pulse-height spectra

…deposition spectum of 10 MeV neutrons in a NE-213 scintillator. . . . 51 3.15 Energy deposition… …cylindrical NE-213 and EJ-315 scintillation detectors… …4.12 Initial light output for recoiling protons in NE-213 and deuterons in EJ-315. 73 4.13… …Intial resolution function for the proton-recoil scintillator (NE-213). . . . . . 74… …74 4.15 Preliminary pulse-height spectra for the proton-recoil scintillator (NE-213… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Turko, J. (2017). Detector Response Simulations of Hydrocarbon Neutron Scintillators. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11602

Chicago Manual of Style (16th Edition):

Turko, Joseph. “Detector Response Simulations of Hydrocarbon Neutron Scintillators.” 2017. Masters Thesis, University of Guelph. Accessed April 15, 2021. https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11602.

MLA Handbook (7th Edition):

Turko, Joseph. “Detector Response Simulations of Hydrocarbon Neutron Scintillators.” 2017. Web. 15 Apr 2021.

Vancouver:

Turko J. Detector Response Simulations of Hydrocarbon Neutron Scintillators. [Internet] [Masters thesis]. University of Guelph; 2017. [cited 2021 Apr 15]. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11602.

Council of Science Editors:

Turko J. Detector Response Simulations of Hydrocarbon Neutron Scintillators. [Masters Thesis]. University of Guelph; 2017. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/11602

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