The inclusive differential cross sections for the production of
and
mesons, protons, and antiprotons with momenta between 6 and 50 GeV/
c
and nuclear fragments of mass number
in the momentum range ...between 20 and 220 GeV/
c
were measured in carbon–lead collisions at a beam kinetic energy of 19.6 GeV per nucleon (
GeV). A comparison with the respective cross sections for carbon–carbon interactions is performed, and the dependence on the target mass number (
) is estimated. The present analysis shows that the observed particles originate predominantly from peripheral interactions.
The invariant cross sections for forward charged-hadron production at zero angle in carbon–carbon collisions at a beam kinetic energy of 19.6 GeV per nucleon were measured at the U-70 accelerator in ...an experiment performed with the aid of a combined spectrometer including beam line 22 and detectors of the modified FODS setup. The beam line rigidity was varied between 7 and 70 GeV/
. The results are compared with the predictions of the FTFP model and a self-similar solution for nucleus–nucleus collisions.
High voltage source control on FODS Patalakha, D I; Kalinin, A Yu; Kulagin, N V
Journal of physics. Conference series,
01/2017, Letnik:
798, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The implementation of the high voltage power supply control system (HVPSCS) for experimental setup FODS (FOcusing Doublearmed Spectrometer) at accelerator U-70 of the Federal State Budgetary ...Institution State Research Center Of Russia Institute for High Energy Physics of the National Research Centre "Kurchatov Institute" (hereinafter referred to as IHEP) or for the test bench of the detector components is considered. The required set of hardware is defined and the appropriate software to operate HVPSCS is written in C/C++ codes. The date acquisition (DAQ) system 1 makes automatic control on HVPSCS for data taking run. It allows to get the dependence of appropriate detector parameters on the high voltage supply values and choose its optimal values for FODS detectors. The test run results of HVPSCS are presented.
The inclusive differential cross sections for forward production of nuclear fragments at an angle of 0∘ in CC collisions at beam energy 20.5 GeV/nucleon (SNN=6.3GeV) are presented. Measurements have ...been performed at the U-70 Accelerator Complex (Protvino) using a combined spectrometer on base of the beamline. Fragments selection was carried out by measuring of ionization in scintillation counters taking into account the data from threshold Cherenkov counters and hadron calorimeter. Fragment mass was determined through Cherenkov light emission angle measured in the spectrometer of ring imaging Cherenkov radiation. Data are given for fragments with charge 1≤Z≤6, atomic number 1≤A≤10 and A/Z<3.4 with momenta from 20 to 210 GeV/c. The measurements are compared with Fritiof model, statistical models and theoretical parameterizations. The discovered differences between theory and experiment are discussed.
A procedure for finding the trajectories of charged particles on the FODS (focusing double-arm spectrometer) is described, which includes channel calibration (
r
(
t
)-dependence) of drift detectors ...for calculating the coordinates of particles and reconstruction of tracks. The organization of time measurements and construction of a least-squares functional on their basis is considered. The criteria for selecting candidates for the tracks are discussed. A procedure has been developed for obtaining geodesic corrections for drift chambers and tubes at the analysis of physical events. Accuracies of measuring the coordinates in drift chambers of 600 μm and chambers on drift tubes of 500 μm were obtained. The distribution of particle trajectories in the target is given.
Relative yields of high-
x
F
charged hadrons (
π
±
, К
±
,
р
,
p
¯
, and
d
) in proton–nucleus interactions at incident-proton momenta of 25 and 50 GeV/c were measured at an angle of 0° in the ...momentum range between 15 and 40 GeV/
c
. An upper limit on the forward production of two protons in proton–nucleus interactions at 50 GeV/
c
was estimated. The properties of a carbon beam with an energy of 25 GeV per nucleon and fragment yields in its interaction with nuclear targets were measured within a short exposure.
Relative yields of high-x.sub.F charged hadrons (pi.sup.+ or -, K.sup.+ or -, p, bar.p, and d) in proton--nucleus interactions at incident-proton momenta of 25 and 50 GeV/c were measured at an angle ...of 0degrees in the momentum range between 15 and 40 GeV/c. An upper limit on the forward production of two protons in proton--nucleus interactions at 50 GeV/c was estimated. The properties of a carbon beam with an energy of 25 GeV per nucleon and fragment yields in its interaction with nuclear targets were measured within a short exposure. DOI: 10.1134/S1063778817020090
Search for heavy neutrinos in K + → μ + ν H decays Artamonov, A. V.; Bassalleck, B.; Bhuyan, B. ...
Physical review. D, Particles, fields, gravitation, and cosmology,
03/2015, Letnik:
91, Številka:
5
Journal Article
Odprti dostop
Here, evidence of a heavy neutrino, νH, in the K+→μ+νH decays was sought using the E949 experimental data with an exposure of 1.70 × 1012 stopped kaons. With the major background from the radiative ...K+→μ+νμγ decay understood and suppressed, upper limits (90% C.L.) on the neutrino mixing matrix element between the muon and heavy neutrinos, |UμH|2, were set at the level of 10–7 to 10–9 for the heavy neutrino mass region 175 to 300 MeV/c2.
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