Browsing by Author "Huang, M. A."

Now showing 1 - 5 of 5

Determinations of flavor ratios and flavor transitions of astrophysical neutrinos
(2010)
Lin, Guey-Lin
;
Liu, T. C.
;
Lai, Kwang-Chang
;
Huang, M. A.
;
物理研究所
We argue that an effective flavor discrimination in neutrino telescopes is the key to probe the flavor ratios of astrophysical neutrinos at the source and flavor transition mechanisms of these neutrinos during their propagations from the source to the Earth. We first discuss how well one can reconstruct the flavor ratios of astrophysical neutrinos at the source. We then discuss how to probe flavor transition mechanisms of propagating astrophysical neutrinos. In this regard, we propose a model independent parametrization for neutrino flavor transitions, with the neutrino oscillation as a special case.
FLASH-TW experiment status report
(2005)
Liu, T. C.
;
Chang, F. Y.
;
Chen, C. C.
;
Chen, C. W.
;
Huang, M. A.
FLASH-TW is an experiment to measure the shower lateral and longitudinal profiles. We perform the shower profile measurement by shooting the 1.5 GeV electron beams in NSRRC on targets made of 15 aluminum blocks, each with a thickness of 2.9 cm. A scintillator (Al2O3: Cr)) is placed behind the targets, converting the secondary shower particles into light. The light from the central region of the shower is recorded by a CCD camera while the light from the outer region is monitored by PMTs. The CCD system is successfully implemented in the run 2 and run 3 of experiment FLASH at SLAC. A test run of the current experiment has been conducted in NSRRC in the past June to study the scintillator spectrum. Two more runs are planned from now to the year 2006 to measure the shower lateral and longitudinal profiles.
Laboratory astrophysics in Taiwan
(2007-02-01)
Lin, G. -L.
;
Liu, T. -C.
;
Huang, M. A.
;
Hwang, W-Y. P.
;
Chen, C. -C.
We report the development of laboratory astrophysics program in Taiwan. We begin with outlining Taiwan's participation in the FLASH collaboration for measuring the fluorescence yield using SLAC 28.5 GeV electron beam. We then report the domestic effort of studying cosmic ray shower properties using NSRRC 1.5 GeV electron beam.
Simulation of the cosmic ray tau neutrino telescope (CRTNT) experiment
(2009-07-01)
Liu, J. L.
;
Zhang, S. S.
;
Cao, Z.
;
He, H. H.
;
Huang, M. A.
A tau lepton can be produced in a charged current interaction by a cosmic ray tau neutrino with material inside a mountain. If it escapes from the mountain, it will decay and initiate a shower in the air, which can be detected by an air shower fluorescence/Cherenkov light detector. Designed according to such a principle, the cosmic ray tau neutrino telescope (CRTNT) experiment, located at the foothill of Mt Balikun in Xinjiang, China, will search for very high-energy cosmic tau neutrinos from energetic astrophysical sources by detecting those showers. This paper describes a Monte Carlo simulation for a detection of t events by the CRTNT experiment. Ultra-high-energy cosmic ray events are also simulated to estimate the potential contamination. With the CRTNT experiment composed of four detector stations, each covering 64 degrees x 14 degrees field of view, the expected event rates are 28.6, 21.9 and 4.7 per year assuming an AGN neutrino flux according to Semikoz and Sigl (2004 J. Cosmol. Astropart. Phys. JCAP 04(2004)003), Mannheim-Protheroe-Rachen (MPR) active galactic nucleus (AGN) jet model and Stecker-Done-Salamon-Sommers (SDSS) AGN core model, respectively. Null detection of such a tau event by the CRTNT experiment in 1 year could set a 90% C. L. upper limit on 19.9 (eV cm(-2) s(-1) sr(-1)) for an E(-2) neutrino spectrum.
Tau lepton fluxes in underground salt dome
(2005)
Hong, Y. L.
;
Huang, M. A.
;
Iong, C. H.
;
Lin, G. L.
;
物理研究所
Ultrahigh-energy neutrino originated from the GZK effect is the most plausible source for high energy neutrinos. However, their small flux and low interaction probability make their detection very challenging. To have a proper event rate, the interaction volume must be much larger than the km(3)-size detector currently under construction. One of the alternative techniques resorts to the detection of coherent radio waves produced inside an underground salt dome. We have developed a Monte-Carlo simulation code for the interactions and propagations of leptons inside the Earth. In this code, the Earth is treated as a three-layer sphere consisting of iron in the core, standard rock in the mantle and water on the surface. We have also added salt as the fourth material surrounding the detector. The energy loss of muons and tau leptons in salt are calculated. To simulate a 100-km(3) water-equivalent target volume, we employ a spherical sphere salt dome of 5 km in radius. The tau lepton fluxes.