Spherical neutral detector for VEPP-2M collider Achasov, M.N; Aulchenko, V.M; Baru, S.E ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
07/2000, Letnik:
449, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The Spherical Neutral Detector (SND) operates at VEPP-2M collider in Novosibirsk studying e
+e
− annihilation in the energy range up to 1.4
GeV. Detector consists of a fine granulated spherical ...scintillation calorimeter with 1632 NaI(Tl) crystals, two cylindrical drift chambers with 10 layers of sense wires, and a muon system made of streamer tubes and plastic scintillation counters. The detector design, performance, data acquisition and processing are described.
The conversion decays
φ→
ηe
+
e
− and
η→
γe
+
e
− were studied by the SND detector using
φ-meson production in
e
+
e
−-annihilation at VEPP-2M collider. The branching ratios of these decays were ...measured:
Br(
φ→
ηe
+
e
−)=(1.19±0.19±0.07)×10
−4 and
Br(
η→
γe
+
e
−)=(5.15±0.62±0.39)×10
−3. The
e
+
e
−-pair mass spectra and transition form factors were also studied.
Development of vacuum photoelectron devices at Budker Institute Anashin, V.V.; Achasov, M.N.; Bak, P.A. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/2003, Letnik:
504, Številka:
1-3
Journal Article
Recenzirano
The results of testing of several photomultiplier tubes with microchannel plates (MCPTs) and phototriodes developed at the Budker Institute of Nuclear Physics in 1997–2002 are presented. The MCPTs ...and several types of multianode devices were designed and tested. The counting rate capability of the devices, the dependence of the tube gain versus magnetic field and the cross talks between readout channels were studied.
The development of streak camera with circular deflection of an electron beam for detecting fast light pulses is started. The design and the results of testing the streak camera are presented.
Transverse energy profile of electromagnetic shower Bozhenok, A.V; Ivanchenko, V.N; Silagadze, Z.K
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
09/1996, Letnik:
379, Številka:
3
Journal Article
Recenzirano
A Monte Carlo study of the transverse energy distribution in an electromagnetic shower for the Spherical Neutral Detector (SND) calorimeter has been performed. On the basis of this study a new ...parameter is suggested for
γ
K
L
and
e
π
separation.
The process e(+)e(-)-->mu(+)mu(-) has been studied by the SND detector at the VEPP-2M e(+)e(-) collider in the phi(1020)-resonance energy region. The measured effective phi meson leptonic branching ...ratio B(phi-->l(+)l(-)) identical with square root of B(phi-->e(+)e(-))B(phi-->mu(+)mu(-)) = (2.89 +/- 0.10 +/- 0.06) x 10(-4) agrees well with the Particle Data Group value B(phi-->e(+)e(-)) = (2.91 +/- 0.07) x 10(-4), confirming mu-e universality. Without additional assumption of mu-e universality the branching ratio B(phi-->mu(+)mu(-)) = (2.87 +/- 0.20 +/- 0.14) x 10(-4) was obtained.
Development of vacuum and gaseous photodetectors in BINP Pyata, E.E; Achasov, M.N; Anashin, V.V ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/2002, Letnik:
494, Številka:
1
Journal Article
Recenzirano
The results of testing of several photomultiplier tubes with microchannel plates (MCP PMT) and phototriodes developed in the Budker Institute of Nuclear Physics in 1997–2002 are presented. The study ...includes single anode MCP PMTs and several types of multianode tubes. The results on counting rate capabilities, dependence of the tube gain on external magnetic field and cross-talks between individual channels are presented. The design of a sealed gas photomultiplier is described.
The current status of experiments with SND detector at VEPP-2M
e
+
e
− collider in the energy range 2
E
0 = 400 – 1400 MeV and recent results of data analyses for f, ω and ϱ decays and
e
+
e
− ...annihilation into hadrons are presented.
The process
e
+
e
−→
π
+
π
− has been studied with the SND detector at VEPP-2M
e
+
e
− collider in the vicinity of
φ(1020) resonance. From the analysis of the energy dependence of measured cross ...section the branching ratio
B(
φ→
π
+
π
−)=(7.1±1.1±0.9)·10
−5 and the phase
ψ
π
=−(34±4±3)° of interference with the non-resonant
π
+
π
− production amplitude were obtained.
PDF
