Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9845402 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2005 | 18 Pages |
Abstract
An electromagnetic calorimeter consisting of 576 undoped CsI crystals has been used to search for the KL0âÏ0νν¯ decay at the KEK 12-GeV proton synchrotron (E391a). The calorimeter is placed in a vacuum of lower than 10â1 Pa. Special energy and timing calibrations have been performed. The energy calibration started from a check of the linearity for nine sample crystals using an electron beam. Then, after mounting all crystals in the E391a detector, we made an in situ calibration of the energy by using cosmic ray and punch-through muons. The gain constants obtained from both muons agree with each other with an accuracy of 2% (Ï). They were further refined by using γγ samples from Ï0's produced off an aluminum plate (5-mm thick) hit by neutral beam particles. Using the final gain constants, we obtained a KL0 mass resolution of 4.3 MeV/c2(Ï) for the KL0âÏ0Ï0Ï0 decay. Also, using the timing constants measured for cosmic rays, we obtained a resolution of 0.51 ns (Ï) for the timing difference among six γ's in the KL0âÏ0Ï0Ï0 decay.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
M. Doroshenko, K. Abe, J.K. Ahn, Y. Akune, V. Baranov, Y. Fujioka, Y.B. Hsiung, T. Ikei, T. Inagaki, S. Ishibashi, H. Ishii, T. Iwata, S. Kobayashi, S. Komatsu, T.K. Komatsubara, A. Kurilin, E. Kuzmin, A. Lednev, Y. Yoshimura,