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Study of Pulse Shape Discrimination of Sub-MeV Neutrons From Gamma-Rays with Liquid Scintillator
M. Yoshioka,M. Ueyama,Y. Koba,Y. Nakamura,T. Kajimoto,D. Moriguchi,Y. Uozumi,N. Shigyo 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
We have studied pulse shape discrimination of sub-MeV neutron from spallation nuclear reactions. Neutron measurements were carried out with a 2-inch NE213 scintillator viewed by a phototube (HAMAMATSU H1949) for the carbon-carbon reaction at 290 MeV/n. Neuron energies were measured with the TOF technique by using a timing pick-up plastic scintillator. Output signals of detectors were digitized and stored with a digitizer (Acqiris DC282). The digital pulse shape discrimination (DPSD) has been investigated through comparison between three different analyzing algorithms. Effects on the neutron-gamma (n/g) discrimination were also investigated after the subtraction of background and abnormal events. Moreover, in order to realize better n/g discrimination the detector system was cooled down to about zero degrees centigrade by Peltier devices to suppress the dark current of the phototube which would be the main cause distorting pulse shapes. Experimental studies were made in terms of the temperature dependence of detector performance including pulse shape.
Neutron-Production Double-Differential Cross Sections from Heavy-Ion Interactions
D. Satoh,D. Moriguchi,T. Kajimoto,Y. Koba,Y. Nakamura,N. Shigyo,M. Ueyama,Y. Uozumi,M. Yoshioka,N. Matsufuji,M. Takada,T. Sanami 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The existing data of neutron-production double-differential cross sections on C, Cu, and Pb targets bombarded with heavy-ions from He to Xe at 230 - 600 MeV/nucleon were revised by using a new set on neutron-detection efficiency values of an NE213-type liquid organic scintillator calculated with SCINFUL-QMD. The revised data were compared with the experimental data obtained by our new measurements, and the predictions of the Monte-Carlo particle transport codes, PHITS, FLUKA, MCNPX, and Geant4. While the revised and new experimental data showed good agreement, the Monte-Carlo codes failed to reproduce the high-energy peaks in the forward angular region.
Measurement of Neutron-Production Cross Sections for 290 MeV/u Carbon Ion Incidence
D. Moriguchi,Y. Nakamura,T. Kajimoto,Y. Koba,M. Ueyama,M. Yoshioka,N. Shigyo,Y. Uozumi,D. Satoh,T. Sanami,M. Takada,N. Matsufuji 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Neutron-production double-differential cross sections for 290 MeV/u carbon-ion incidence on carbon target were measured with NE213 liquid organic scintillators by time-of-flight technique. NE213 liquid organic scintillators 12.7 cm in diameter and 12.7 cm thick were placed in the directions of 15˚, 30˚, 45˚, 60˚, 75˚, and 90˚. The typical flight path length was 4.0 m. In order to reduce neutrons from the beam dump, an iron and a concrete shield was placed between the detectors and the beam dump. For measurement of background, a shadow bar was set between the target and each detector. Neutron detection efficiencies were obtained by calculations with a Monte Carlo simulation code SCINFUL-QMD. The cross sections were obtained for neutron energy above 2.8 MeV. The experimental results were compared with the calculation data of the PHITS code.
Aline C. C. Tritto,Mariane T. Amano,Maria E. De Cillo,Vinicius A. Oliveira,Sandro H. Mendes,Caroline Yoshioka,Hamilton Roschel,Niels Olsen S. Camara,Bruno Gualano,Guilherme G. Artioli 한국운동재활학회 2018 JER Vol.14 No.1
The role of plasma glutamine concentration and glutamine supplemen-tation on immunosuppression was investigated in combat athletes. Twenty-three male athletes were randomly assigned to receive gluta-mine (21 g/day, n=12) or placebo (ovalbumin, n=11) for 10 days. Six athletes who did not lose weight served as controls. Athletes were as-sessed 21 days before (-21d), 1 day before (-1d) and 5 days after (+5d) a competition. Weight reduction was similar between glutamine (-8.2%± 4.1%) and placebo (-8.5%±2.4%) and negligible in control (-0.6%±1.4%). In both weight-loss groups, the majority of athletes reported symptoms of upper respiratory symptoms, as assessed by the Wisconsin upper respiratory symptom survey questionnaire. Only two athletes reported symptoms in the control group. Immune cell function remained un-changed throughout the study except for an increase in neutrophil phagocytic activity (placebo: -21d=5,251±2,986; -1d=17,428±22,374; +5d=21,125±21,934; glutamine: -21d=6,096±3,549; -1d=11,029±17,113; +5d=28,186±21,032 FI) and a minor change in monocyte phagocytic activity (placebo: -21d=4,421±3,634; -1d=3,329±6,283; +5d=3,243± 2,553; glutamine: -21d=4,051±3,186; -1d=3,106±2,625; +5d=4,981± 4,598) in both glutamine and placebo after weight loss. Plasma gluta-mine and cortisol remained unchanged across the study. creatine ki-nase levels were increased in placebo (-21d=125.2±54.1; -1d=187.2± 73.5; +5d=111.3±59.1 U/L) but not in glutamine (-21d=136.2±58.2; -1d= 168.8±65.0; +5d=129.7±64.0 U/L). Rapid weight loss increased the fre-quency and severity of infection symptoms, but this was neither associ-ated with plasma glutamine depletion nor counteracted by glutamine supplementation.
Final report on key comparison CCAUV.U-K3.1
Haller, J,Koch, C,Costa-Felix, R P B,Dubey, P K,Durando, G,KIM, Y T,Yoshioka, M BUREAU INTERNATIONAL DES POIDS ET MESURES 2016 METROLOGIA -BERLIN- Vol.53 No.-
<P></P> <P>The CCAUV.U-K3.1 is a follow-up of the comparison CCAUV.U-K3 which was the third key comparison in the ultrasound branch organised under the auspices of the Consultative Committee for Acoustics, Ultrasound and Vibration (CCAUV) of the BIPM. It was necessary to allow participants with discrepant values and additional laboratories to have another possibility to take part in an international comparison and to test their measurement facilities. The comparison dealt with power measurement in the frequency range 2 to 10.5 MHz and a power range between 10 mW and 15 W. The parameter range covered is of particular importance for medical applications of ultrasound.</P> <H2>Main text</H2> <P> To reach the main text of this paper, click on <A HREF='http://www.bipm.org/utils/common/pdf/final_reports/AUV/U-K3/CCAUV.U-K3.1_Final_Report.pdf'>Final Report</A>. Note that this text is that which appears in Appendix B of the BIPM key comparison database <A HREF='http://kcdb.bipm.org/'>kcdb.bipm.org/</A>.</P> <P>The final report has been peer-reviewed and approved for publication by the CCAUV, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).</P>