|
|
Preprints and Communications
 Here
you can find JINR preprints and communications in pdf format starting
from 1999.
File size is given in bytes in round brackets.
| 2012 |
|
E2-2012-2 (168.559)
Lyuboshitz V.L., Lyuboshitz V.V.
Lepton Mixing under the Lepton-Charge Nonconservation,
Neutrino Masses and Oscillations and the «Forbidden» Decay 
The lepton-charge (Le, L ,
L ) nonconserving
interaction leads to the mixing of the electron, muon, and tau neutrinos,
which manifests itself in spatial oscillations of a neutrino beam, and also
to the mixing of the electron, negative muon, and - lepton, which, in
particular, may be the cause of the «forbidden» radiative decay of the
negative muon into the electron and  quantum. Under the assumption
that the nondiagonal elements of the mass matrices for neutrinos and
ordinary leptons, connected with the lepton-charge nonconservation, are the
same, and by performing joint analysis of the experimental data on
neutrino oscillations and experimental restriction for the probability
of the decay per unit time, the following estimate for
the lower bound of neutrino mass has been obtained: m( ) > 1.5 eV/c2.
|
E2-2012-12 (265.731)
Tokarev M.V., Zborovsk
On Self-Similarity of Top Production at Tevatron
Results of analysis of D
1.0 fb1 data on top-quark differential
cross section measurements
at the Fermilab Tevatron collider at  = 1960 GeV
in the framework of z-scaling approach are presented.
Flavour independence of the scaling function  (z)
observed in pp and  interactions over a wide collision
energy range = 19-1960 GeV is verified.
This property of (z) was found for different hadrons from
 meson
up to  particle.
The flavour independence of (z) is used as indication to self-similarity
of top-quark production.
A tendency to saturation of (z) at low z for top-quark is demonstrated.
The momentum fractions x1 of the incoming (anti)protons
as a function of the scaled transverse momentum pT/m and masses
of heavy mesons are studied.
We anticipate that data on low- and high-pT inclusive spectra
of top-quark production
at Tevatron and LHC energies could be of interest for verification
of the self-similarity over a wide range of masses and different
flavour content of produced particles.
|
P8-2012-14 (2.877.207)
Agapov N.N. et al.
Development and Reconstruction of VBLHEP Cryogenic System
for NICA Accelerator Complex (2012-2015)
A new NICA accelerator complex (Nuclotron-based Ion Collider fAcility),
presently under construction at JINR, will be, upon its completion in 2016,
among the most advanced research instruments of the physics community. The
facility is aimed to provide collider experiments with heavy ions up to
uranium (gold at the beginning stage) with a centre of mass energy up to 11 GeV/u
and an average luminosity up to 1027 cm-2  s-1.
The NICA cryogenics will be based on the modernized liquid
helium plant that was built in the early 1990s for the superconducting
synchrotron known as Nuclotron. The main goals of the modernization are
increasing of the total refrigerator capacity from 4000 to 8000 W at 4.5 K,
creating a new distribution system of liquid helium, and ensuring the
shortest possible cooldown time. These goals will be achieved by the use of
an additional 1000 l/h helium liquefier and «satellite» refrigerators
located in close proximity to the accelerator rings. We demonstrate helium
flow diagrams with major new components and discuss a system of liquid
nitrogen that will be used for shield refrigerating at 77 K and at the first
stage of cooling down of three accelerator rings with total length of about
1 km and «cold» mass of 220 t.
|
P13-2012-16 (236.117)
Pepelyshev Yu.N. et al.
Experimental Estimations of the Kinetics Parameters of the IBR-2Ì Reactor by Stochastic Noises
Experimental investigations of stochastic fluctuations of pulse energy of
the IBR-2M reactor have been carried out which allowed us to obtain some of
the parameters of the reactor kinetics. At different levels of average power
a sequence of values of pulse energy was recorded with the calculation of
the distribution parameters. An ionization chamber with boron installed near
the active zone was used as a neutron detector. The research results allowed
us to estimate the average lifetime of prompt neutrons
= (6.53  0.2) 10-8 s, absolute power
of the reactor and intensity of the source of spontaneous
neutrons Ssp  (6.72 0.12) 106 s-1.
It was shown that
the experimental results are close to the calculated ones.
|
|
|
up
|
|
