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Neutron Elastic Scattering Cross-Section Measurements at 175 MeV
M. Tesinsky,P. Andersson,C. Gustavsson,S. Pomp,Osterlund,J. Blomgren,V. Simutkin,R. Bevilacqua,A. Hjalmarsson,A. Prokofiev,U. Tippawan,F. -R. Lecolley,N. Marie,A. Kolozhvari 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
An off-line data analysis of an experimental campaign on elastic neutron cross-section measurements at 175 MeV for iron and bismuth performed by the scandal set-up has started. Energy calibration has shown expected values of energy resolution and MCNPX simulations have provided suggestions for further analysis.
Light-Ion Production in 175 MeV Neutron-Induced Reactions on Oxygen
U. Tippawan,T. Vilaithong,S. Pomp,P. Andersson,R. Bevilacqua,J. Blomgren,C. Gustavsson,L. Nilsson,M. Osterlund,V. Simutkin,H. Sjostrand,M. Hayashi,S. Hirayama,Y. Naitou,Y. Watanabe,A. Hjalmarsson,A. P 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Data on light-ion production in light nuclei such as carbon, nitrogen and oxygen are particularly important in calculations of dose distributions in human tissue for radiation therapy at neutron beams, and for dosimetry of high energy neutrons produced by high-energy cosmic radiation interacting with nuclei (nitrogen and oxygen) in the atmosphere. When studying neutron dose effects, special consideration on carbon and oxygen is needed since they are, by weight, the most abundant elements in human tissue. The MEDLEY setup at The Svedberg Laboratory (TSL), Uppsala, Sweden has been used to measure such data with double-differential cross sections (DDX) for the (n,xp), (n,xd), (n,xt), (n,^3He), and (n,α) reactions from C, O, Si, Ca, Fe, Pb, and U around 96 MeV. At the new Uppsala neutron beam facility the available energy range of quasi mono-energetic neutron beams is extended up to 175 MeV. The detector setup used in MEDLEY consists of eight so-called telescopes mounted at different angles inside an evacuated reaction chamber. Each of the telescopes consists of two fully depleted ΔE silicon surface barrier detectors (SSBD) and a CsI(Tl) crystal. In order to make measurements at this higher neutron energy possible some changes in the detector setup compared to the campaign at 96 MeV were applied Accordingly, the second ΔE detectors have been replaced by 1000 μm thick SSBDs as well as the size of the crystals used as E detectors was increased to a total length of 100 mm and a diameter of 50 mm. The ΔE - E technique is used to identify the light ions, and cutoff energies as low as 2.5 MeV for protons and 4.0 MeV for alpha particles are achieved. The data are normalised relative to elastic np scattering measured in one of the telescopes at 20 degrees. Preliminary DDXs for oxygen are presented and compared with theoretical calculations.
I. V. Ryzhov,G. A. Tutin,V. D. Simutkin,J. Blomgren,S. Pomp,M. Osterlund,P. Andersson,R. Bevilacqua,M. S. Onegin,L. A. Vaishnene,J. P. Meulders,R. Prieels 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Incineration of spent nuclear fuel in Accelerator Driven Systems requires nuclear data on neutron-induced fission of actinides at energies above 20 MeV - the upper limit of conventional evaluated nuclear data files. Over the past years, a significant effort has been devoted to measurements of neutron-induced fission cross-sections at intermediate energies but there is a lack of experimental data on fission yields. Here we describe recent measurements of pre-neutron emission fragment mass distributions from intermediate energy neutron-induced fission of <sup>232</sup>Th and <sup>238</sup>U. The measurements have been carried out at the neutron beam of the Louvain-la-Neuve cyclotron facility CYCLONE. Quasi-monoenergetic neutrons with peak energies at 32.8, 45.3 and 59.9 MeV were produced by protons impinging on a thin lithium target. A multi-section Frisch-gridded ionization chamber was used as a fission fragment detector. The measurement results are compared with available experimental data as well as with predictions of the multi-modal random neck-rupture model implemented into the TALYS code.
Light-Ion Production from a Thin Silicon Target Bombarded by 175 MeV Quasi Monoenergetic Neutrons
S. Hirayama,Y. Watanabe,Y. Naitou,P. Andersson,R. Bevilacqua,C. Gustavsson,M. Osterlund,S. Pomp,V. Simutkin,H. Sjostrand,A. Hjalmarsson,A. Prokofiev,M. Tesinsky,U. Tippawan 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Double-differential production yields of light ions (p, d, t, ^3He, and α from a thin silicon target induced by 175 MeV quasi mono-energetic neutrons were measured using the MEDLEY setup at the The Svedberg Laboratory (TSL) in Uppsala in order to benchmark evaluated nuclear data and nuclear reaction models. The MEDLEY is a conventional spectrometer system which consists of eight counter telescopes. Each telescope is composed of two silicon surface barrier detectors as the ΔE detectors and a CsI(Tl) scintillator as the E detector for particle identification. The telescopes are placed at angles from 20˚ to 160˚ in steps of 20˚. The measured double-differential yields of light ions are compared with PHITS calculations using the following nuclear reaction options: the high-energy nuclear data library (JENDL/HE-2007), the quantum molecular dynamics (QMD) model, and the intra-nuclear cascade (INC) model.
Characterization of ANITA and QMN Neutron Beams at TSL Using Proton Recoil Techniques
Y. Naitou,Y. Watanabe,S. Hirayama,M. Hayashi,A. Prokofiev,A. Hjalmarsson,S. Pomp,P. Andersson,R. Bevilacqua,C. Gustavsson,M. Osterlund,V. Simutkin,H. Sjostrand,M. Tesinsky,U. Tippawan 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Neutron beam characterization measurements have been carried out in both the ANITA and QMN modes using the incident proton beam of 180 MeV at the The Svedverg Laboratory (TSL) in Uppsala. The spectral neutron flux data have been obtained by measuring elastic np-scattering with the Medley setup. The experimental results in the ANITA and QMN modes are compared with an MCNPX simulation and with the systematics of QMN spectra, respectively.
Light-Ion Production in The Interaction of 175 MeV Neutrons with Iron and Bismuth
R. Bevilacqua,S. Pomp,V. D. Simutkin,U. Tippawan,M. Hayashi,S. Hirayama,Y. Naitou,Y. Watanabe,A. V. Prokofiev,A. Hjalmarsson,P. Andersson,J. Blomgren,M. Osterlund,M. Tesinsky,F. -R. Lecolley,N. Marie 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
We have measured double-differential (angle and energy) cross sections for light-ion (p, d, t, ^3He, and α) production in the interaction of quasi-monoenergetic 175 MeV neutrons with iron and bismuth. Measurements have been performed at the The Svedberg Laboratory, Uppsala (Sweden), using the Medley setup which allows low-energy thresholds and wide energy and angular ranges. Medley is a spectrometer system consisting of eight three-element telescopes placed at angles from 20˚ to 160˚, in steps of 20˚. Each telescope is composed of two silicon surface barrier detectors and a CsI(Tl) scintillator, to perform particle identification,fully stop the produced light-ions and measure their kinetic energy. The time-of-flight was used to reduce the contribution from the low energy tail in the accepted incident neutron spectrum. We report double-differential production cross sections for protons, deuterons, tritons, ^3He and α particles and compare them with model calculations with TALYS-1.2.