ar X iv : h ep - e x / 04 06 05 5 v 1 2 1 Ju n 20 04 Recent K 2 K Results
نویسنده
چکیده
For neutrino-beam production, 12-GeV protons from the KEK proton synchrotron (PS) are extracted in a 1.1μs spill every 2.2seconds. The proton beam is bent to the Kamioka direction, and hits an aluminum target embedded in the first horn. A pair of horn magnets focuses positively charged particles, mainly positive pions produced in the proton-aluminum interaction. A pion monitor[3] is occasionally put downstream of the 2nd horn in order to measure the direction and momentum of the pions. The positive pions decay into μ and νμ during their flight in a 200-m decay pipe. The νμ is used for the experiment. The beam is monitored by a muon monitor pulse-by-pulse by measuring the muons from π decay. The neutrino beam, itself, is monitored by a near detector system located 300 m from the target. The near detector system consists of a 1-kiloton water cherenkov detector (1KT), a scintillation fiber detector (SCIFI),[4] a muon range detector (MRD)[5] and originally a KEK Preprint 2004-22 Talk presented at the 5th Workshop on Neutrino Oscillations and their Origin (NOON2004), Tokyo, Japan, February 11-15, 2004 Partially supported by the Grants for Scientific Research of Monkasho.
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تاریخ انتشار 2004