Author: "Hwang, M.‐J." / Publication Type: Reports - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"Hwang, M.‐J."' showing total 4 results

Start Over Author "Hwang, M.‐J." Publication Type Reports

Author: Ma, K. J., Kang, W. G., Ahn, J. K., Choi, S., Choi, Y., Hwang, M. J., Jang, J. S., Jeon, E. J., Joo, K. K., Kim, H. S., Kim, J. Y., Kim, S. B., Kim, S. H., Kim, W., Kim, Y. D., Lee, J., Lim, I. T., OH, Y. D., Pac, M. Y., Park, C. W., Park, I. G., Park, K. S., Stepanyan, S. S., and Yu, I.
Subjects: Physics - Instrumentation and Detectors
Abstract: We have studied the afterpulse of a hemispherical photomultiplier tube for an upcoming reactor neutrino experiment. The timing, the amplitude, and the rate of the afterpulse for a 10 inch photomultiplier tube were measured with a 400 MHz FADC up to 16 \ms time window after the initial signal generated by an LED light pulse. The time and amplitude correlation of the afterpulse shows several distinctive groups. We describe the dependencies of the afterpulse on the applied high voltage and the amplitude of the main light pulse. The present data could shed light upon the general mechanism of the afterpulse., Comment: 11 figures
Published: 2009
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Author: Lee, H. S., Bhang, H. C., Choi, J. H., Dao, H., Hahn, I. S., Hwang, M. J., Jung, S. W., Kang, W. G., Kim, D. W., Kim, H. J., Kim, S. C., Kim, S. K., Kim, Y. D., Kwak, J. W., Kwon, Y. J., Lee, J., Lee, J. H., Lee, J. I., Lee, M. J., Lee, S. J., Li, J., Li, X., Li, Y. J., Myung, S. S., Ryu, S., So, J. H., Yue, Q., and Zhu, J. J.
Subjects: Astrophysics
Abstract: The Korea Invisible Mass Search(KIMS) experiment presents new limits on WIMP-nucleon cross section using the data from an exposure of 3409 kgd taken with low background CsI(Tl) crystals at Yangyang underground laboratory. The most stringent limit on the spin dependent interaction for pure proton case is obtained. The DAMA signal region for both spin independent and spin dependent interactions for the WIMP mass higher than 20 GeV/c^2are excluded by the single experiment with crystal scintillators., Comment: 11 pages, 6 figures
Published: 2007
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Author: Kims Collaboration, Lee, H. S., Bhang, H., Kim, S. Y., Lee, J., Lee, J. H., Kwak, J. W., Myung, S. S., Lee, M. J., Kim, S. C., Choi, J. H., Kim, S. K., Kim, T. Y., Park, H., Yang, H. Y., Lee, J. I., Kim, Y. D., Hwang, M. J., Kwon, Y. J., Hahn, I. S., Kim, H. J., He, D., Zhu, J. J., and Li, J.
Subjects: Astrophysics
Abstract: The Korea Invisible Mass Search (KIMS) collaboration has been carrying out WIMP search experiment with CsI(T$\ell$)crystal detectors at the YanYang Underground Laboratory. A successful reduction of the internal background of the crystal is done and a good pulse shape discrimination is achieved. We report the first result on WIMP search obtained with 237 kg$\cdot$days data using one full-size CsI(T$\ell$)crystal of 6.6 kg mass., Comment: 16 pages, 9 figures, submitted to Physics Letters B
Published: 2005
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Author: Park, H., Choi, D. H., Hahn, I. S., Hwang, M. J., Kang, W. G., Kim, H. J., Kim, J. H., Kim, S. C., Kim, S. K., Kim, T. Y., Kim, Y. D., Kwon, Y. J., Lee, H. S., Lee, J. H., Lee, M. H., Lee, S. E., Noh, S. H., Park, I. H., Seo, E. S., Won, E., Yang, H. Y., Yang, M. S., and Yu, I.
Subjects: Nuclear Experiment
Abstract: We have studied the response of Tl-doped and Na-doped CsI crystals to nuclear recoils and $\gamma$'s below 10 keV. The response of CsI crystals to nuclear recoil was studied with mono-energetic neutrons produced by the $^3$H(p,n)$^3$He reaction. This was compared to the response to Compton electrons scattered by 662 keV $\gamma$-ray. Pulse shape discrimination between the response to these $\gamma$'s and nuclear recoils was studied, and quality factors were estimated. The quenching factors for nuclear recoils were derived for both CsI(Na) and CsI(Tl) crystals., Comment: 21pages, 14figures, submitted to NIMA
Published: 2002
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