Emulsion chamber with big radiation length for detecting neutrino oscillations

Citation
Ae. Asratyan et al., Emulsion chamber with big radiation length for detecting neutrino oscillations, NUCL INST A, 450(1), 2000, pp. 1-11
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ISSN journal
0168-9002 → ACNP
Volume
450
Issue
1
Year of publication
2000
Pages
1 - 11
Database
ISI
SICI code
0168-9002(20000801)450:1<1:ECWBRL>2.0.ZU;2-6
Abstract
A conceptual scheme of a hybrid-emulsion spectrometer for investigating var ious channels of neutrino oscillations is proposed. The design emphasizes d etection of tau leptons by detached vertices, reliable identification of el ectrons, and good spectrometry for all charged particles and photons. A dis tributed target is formed by layers of low-Z material, emulsion-plastic-emu lsion sheets, and air gaps in which tau decays are detected. The tracks of charged secondaries, including electrons, are momentum-analyzed by curvatur e in magnetic field using hits in successive thin layers of emulsion. The t au leptons are efficiently detected in all major decay channels, including tau(-) --> e(-)nu<(nu)over bar>. The performance of a model spectrometer, t hat contains 3 t of nuclear emulsion and 20 t of passive material, is estim ated for different experimental environments. When irradiated by the nu(mu) beam of a proton accelerator over a medium baseline of [L/E-nu] similar to 1 km/GeV, the spectrometer will efficiently detect either the nu(mu) --> n u(tau) or the nu(mu) --> nu(e) transitions in the mass-difference region of Delta m(2) similar to 1 eV(2), as suggested by the results of LSND. When e xposed to the neutrino beam of a muon storage ring over a long baseline of [L/E-nu] similar to 10-20 km/GeV, the model detector will efficiently probe the entire pattern of neutrino oscillations in the region Delta m(2) simil ar to 10(-2)-10(-3) eV(2), as suggested by the data on atmospheric neutrino s. (C) 2000 Elsevier Science B.V. All rights reserved.