-
V. I. Sharov,
N. G. Anischenko,
V. G. Antonenko,
S. A. Averichev,
L. S. Azhgirey, V. D. Bartenev,
N. A. Bazhanov,
A. A. Belyaev,
N. A. Blinov,
N. S. Borisov, [......],
L. N. Strunov,
A. L. Svetov,
Yu. A. Usov,
T. Vasiliev,
V. I. Volkov,
E. I. Vorobiev,
I. P. Yudin,
I. V. Zaitsev,
A. A. Zhdanov,
V. N. Zhmyrov
[show abstract]
[hide abstract]
ABSTRACT: New accurate data of the neutron-proton spin-dependent total-cross-section difference Δσ
L(np) at the neutron-beam kinetic energies 1.39, 1.69, 1.89, and 1.99 GeV are presented. In general, these data complete the measurements
of energy dependence of Δσ
L(np) over the Dubna Synchrophasotron energy region. Measurements were carried out at the Synchrophasotron of the Veksler and
Baldin Laboratory of High Energies of the Joint Institute for Nuclear Research. The quasi-monochromatic neutron beam was produced
by breakup of extracted polarized deuterons. The deuteron (and hence neutron) polarization direction was flipped every accelerator
burst. The initial transverse (with respect to beam momentum) neutron polarization was changed to a longitudinal one and longitudinally
polarized neutrons were transmitted through the large proton longitudinally polarized target. The target polarization direction
was inverted after one to two days of measurements. Four different combinations of the beam and target parallel and antiparallel
polarization directions, both oriented along the neutron-beam momentum, were used at each energy. A fast decrease in −Δσ
L(np) with increasing energy above 1.1 GeV and a structure in the energy dependence around 1.8 GeV, first observed from our previous
data, seem to be well revealed. The new results are also compared with model predictions and with phase-shift analysis fits.
The Δσ
L quantities for isosinglet state I = 0, deduced from the measured Δσ
L(np) values and known Δσ
L(pp) data, are also given. The results of the measurements of unpolarized total cross sections σ
0tot(np) at 1.3, 1.4, and 1.5 GeV and σ
0tot(nC) at 1.4 and 1.5 GeV are presented as well. These data were obtained using the same apparatus and high-intensity unpolarized
deuteron beams extracted either from the Synchrophasotron or from the Nuclotron.
Physics of Atomic Nuclei 10/2005; 68(11):1796-1811. · 0.57 Impact Factor
-
V. I. Sharov,
N. G. Anischenko,
V. G. Antonenko,
S. A. Averichev,
L. S. Azhgirey, V. D. Bartenev,
N. A. Bazhanov,
A. A. Belyaev,
N. A. Blinov,
N. S. Borisov, [......],
L. N. Strunov,
A. L. Svetov,
Yu. A. Usov,
T. Vasiliev,
V. I. Volkov,
E. I. Vorobiev,
I. P. Yudin,
I. V. Zaitsev,
A. A. Zhdanov,
V. N. Zhmyrov
[show abstract]
[hide abstract]
ABSTRACT: New accurate data on the neutron-proton spin-dependent total cross section difference Δσ
L(np) at the neutron beam kinetic energies 1.4, 1.7, 1.9 and 2.0 GeV are presented. A number of physical and methodical results
on investigation of an elasticnp→pn charge exchange process over a few GeV region are also presented. Measurements were carried out at the Synchrophasotron and
Nuclotron of the Veksler and Baldin Laboratory of High Energies of the Joint Institute for Nuclear Research.
Czechoslovak Journal of Physics 12/2004; 55:A289-A305. · 0.42 Impact Factor
-
V. I. Sharov,
N. G. Anischenko,
V. G. Antonenko,
S. A. Averichev,
L. S. Azhgirey, V. D. Bartenev,
N. A. Bazhanov,
A. A. Belyaev,
N. A. Blinov,
N. S. Borisov, [......],
L. N. Strunov,
A. L. Svetov,
Yu A. Usov,
T. Vasiliev,
V. I. Volkov,
E. I. Vorobiev,
I. P. Yudin,
I. V. Zaitsev,
A. A. Zhdanov,
V. N. Zhmyrov
[show abstract]
[hide abstract]
ABSTRACT: New accurate results of the neutron-proton spin-dependent total cross section difference
DsL(np)\Delta\sigma_{\mathrm L}(np)
at the neutron beam kinetic energies 1.39, 1.69, 1.89 and 1.99 GeV are presented. Measurements were carried out in 2001 at the Synchrophasotron of the Veksler and Baldin Laboratory of High Energies of the Joint Institute for Nuclear Research. A quasi-monochromatic neutron beam was produced by break-up of extracted polarized deuterons. The deuteron (and hence neutron) polarization direction was flipped every accelerator burst. The vertical neutron polarization direction was rotated onto the neutron beam direction and longitudinally (L) polarized neutrons were transmitted through a large proton L-polarized target. The target polarization vector was inverted after 1-2 days of measurements. The data were recorded for four different combinations of the beam and target parallel and antiparallel polarization directions at each energy. A fast decrease of
DsL(np)\Delta\sigma_{\mathrm L}(np)
with increasing energy above 1.1 GeV was confirmed. The structure in the
DsL(np)\Delta\sigma_{\mathrm L}(np)
energy dependence around 1.8 GeV, first observed from our previous data, seems to be well pronounced. The new results are also compared with model predictions and with phase shift analysis fits. The
DsL\Delta\sigma_{\mathrm L}
quantities for isosinglet state I = 0, deduced from the measured
DsL(np)\Delta\sigma_{\mathrm L}(np)
values and the known
DsL(pp)\Delta\sigma_{\mathrm L}(pp)
data, are also given. The results were completed by the measurements of unpolarized total cross sections
s0tot(np)\sigma_{0\mathrm{tot}}(np)
at 1.3, 1.4 and 1.5 GeV and
s0tot(n\sigma_{0\mathrm{tot}}(n
C) at 1.4 and 1.5 GeV. These data were obtained using the same apparatus and high intensity unpolarized deuteron beams were extracted either from the Synchrophasotron, or from the Nuclotron.
European Physical Journal C 08/2004; 37(1):79-90. · 3.63 Impact Factor
-
V. I. Sharov,
B. P. Adiasevich,
N. G. Anischenko,
V. G. Antonenko,
S. A. Averichev,
L. S. Azhgirey, V. D. Bartenev,
N. A. Bazhanov,
N. A. Blinov,
N. S. Borisov, [......],
A. L. Svetov,
Yu. A. Usov,
V. I. Volkov,
E. I. Vorobiev,
V. P. Yershov,
I. P. Yudin,
I. V. Zaitsev,
S. A. Zaporozhets,
A. A. Zhdanov,
V. N. Zhmyrov
[show abstract]
[hide abstract]
ABSTRACT: New data on the spin-dependent np observables measured with quasi-monochromatic polarized neutron beam in the energy region from 1.2 to 3.7 GeV are presented.
Further measurements of np scattering observables using the JINR LHE polarization facility (longitudinal and transverse polarized neutron beams and
a polarized proton target) are discussed. The aim of these studies is to determine the imaginary and real parts of the forward
scattering amplitudes for np and for isospin I=0 systems above 1.1 GeV.
Czechoslovak Journal of Physics 12/2000; 51:A87-A96. · 0.42 Impact Factor
-
V.I. Sharov,
S.A. Zaporozhets,
B.P. Adiasevich,
N.G. Anischenko,
V.G. Antonenko,
L.S. Azhgirey, V.D. Bartenev,
N.A. Bazhanov,
N.A. Blinov,
N.S. Borisov, [......],
A.Yu. Starikov,
G.D. Stoletov,
L.N. Strunov,
A.L. Svetov,
A.P. Tsvinev,
Yu.A. Usov,
V.I. Volkov,
V.P. Yershov,
A.A. Zhdanov,
V.N. Zhmyrov
[show abstract]
[hide abstract]
ABSTRACT: New results of the neutron-proton spin-dependent total cross section difference at the neutron beam kinetic energies 1.59, 1.79 and 2.20 GeV are presented. Measurements were performed at the Synchrophasotron
of the Laboratory of High Energies of the Joint Institute for Nuclear Research in Dubna. A quasi-monochromatic neutron beam
was produced by break-up of extracted polarized deuterons. Neutrons were transmitted through a large polarized proton target.
Measurements were performed either with a parallel or an antiparallel beam and target polarizations, both oriented along the
beam momentum. The results at the two higher energies were measured with two opposite beam and target polarization directions.
Only one target polarization direction was available at 1.59 GeV. The present measurements agree well with existing data.
A fast decrease of the values with increasing energy above 1.1 GeV was confirmed. The new results are also compared with model predictions and with
phase shift analysis fits. The quantities for isosinglet state I=0, deduced from the measured values and known data, are given.
European Physical Journal C 02/2000; 13(2):255-265. · 3.63 Impact Factor
-
V. I. Sharov,
S. A. Zaporozhets,
N. G. Anischenko, V. D. Bartenev,
N. A. Blinov,
Yu. T. Borzunov,
Yu. P. Bushuev,
E. V. Chernykh,
S. A. Dolgii,
V. M. Drobin, [......],
V. G. Antonenko,
Yu. P. Polunin,
G. M. Gurevich,
A. A. Kochetkov,
M. S. Nikitina,
A. P. Dzyubak,
A. A. Lukhanin,
G. Durand,
F. Lehar,
A. de Lesquen
[show abstract]
[hide abstract]
ABSTRACT: New results for the np spin-dependent total cross section difference Δσ
p
(np) at neutron beam kinetic energies of 1.59, 1.79 and 2.20 GeV are presented. Measurements of the Δσ
p
(np) energy dependence were carried out at the Synchrophasotron of the Laboratory of High Energies of the Joint Institute for
Nuclear Research in Dubna. The values of Δσ
L
were measured as a difference between the np total cross sections for parallel and antiparallel beam and target polarizations, both oriented along the beam momentum.
A fast decrease of Δσ
p
(np) with increasing energy above 1.1 GeV, as it was first seen from our previous data, was confirmed. The new results are also
compared with model predictions and with the phase shift analysis fits. The Δσ
L
quantities for isosinglet state I=0, deduced from the measured values of Δσ
p
(np) and known Δσ
p
(pp) data, are given.
Czechoslovak Journal of Physics 12/1999; 50:325-330. · 0.42 Impact Factor
