-
A. A. Morozov,
V. G. Antonenko,
S. B. Borzakov,
Yu. T. Borzunov,
E. V. Chernykh,
V. F. Chumakov,
S. A. Dolgii,
M. Finger,
L. B. Golovanov,
A. Janata, [......],
R. A. Shindin,
M. Slunečka,
V. Slunečková,
A. Yu. Starikov,
L. N. Strunov,
E. I. Vorobiev,
I. P. Yudin,
I. V. Zaitsev,
A. A. Zhdanov,
V. N. Zhmyrov
[show abstract]
[hide abstract]
ABSTRACT: The first results of the measurement of 0o of the cross-section ratioR
dp=0.50±0.02 in charge-exchange (np) reaction on H2/D2 targets at the neutron beam kinetic energie 1.0 GeV are presented. As a result the value of the ratio of non spin-flip to
spin-flip contribution innp→pn charge-exchange at 0o
r
np→pn
/nf/fl
=0.33±0.03 was obtained.
Czechoslovak Journal of Physics 04/2012; 55:A307-A314. · 0.42 Impact Factor
-
N. S. Borisov,
N. A. Bazhanov,
A. A. Belyaev,
J Broz,
J. Cerny,
Z. Dolezal,
A. N. Fedorov,
G M Gurevich,
M. P. Ivanov,
P. Kodys, [......],
A.B. Lazarev, F. Lehar,
O. O. Lukhanin,
V N Matafonov,
A. B. Neganov,
I L Pisarev,
J. Svejda,
S N Shilov,
Yu A Usov,
I Wilhelm
[show abstract]
[hide abstract]
ABSTRACT: A frozen spin polarized deuteron target cooled by the 3He/4He dilution refrigerator is described. Fully deuterated 1,2-propanediol was used as a target material. Deuteron vector polarization about 40% was obtained for the target in the shape of a cylinder of 2 cm diameter and 6 cm length. The target is intended for a study of 3N interactions at the polarized neutron beam generated by the Van de Graaff accelerator at the Charles University in Prague.
01/2008;
-
[show abstract]
[hide abstract]
ABSTRACT: Recent measurements at Saturne II show the appearance of a maximum of polarization at - t = 1.0 to 2.0 (GeV/c)2 immediately above kinematic threshold. It now becomes evident that at all energies where the corresponding t-values are permitted by kinematics, and up to the highest energies where the polarization has been measured, there exists a dip of P(t) at - t ~ 1.0 (GeV/c)2 followed by a second maximum in the region of - t ~ (1.0 ÷ 2.0) (GeV/c)2.
EPL (Europhysics Letters) 07/2007; 3(11):1175. · 2.17 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: The possible use of a polarized proton target in the investigation of low-energy nucleon-nucleon interactions is reviewed. The reconstruction of the scattering matrix and verification of P-, T-and isotopical invariances are briefly discussed. Possible sources and detectors of polarized particles are considered. The problem of phase-shift analysis and nucleon-nucleon potentials are treated in the appendices. Tables of experimental values are given for the polarization of nucleons scattered on nucleons. Experimental quantities determined from the phase-shift analysis are given in graphs for the energies 14.5 and 23.1 MeV.
Fortschritte der Physik/Progress of Physics 03/2006; 15(8):495 - 536.
-
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
-
B. Adeva,
E. Arik,
A. Arvidson,
B. Badełek,
G. Baum,
P. Berglund,
L. Betev,
R. Birsa,
N. de Botton,
F. Bradamante, [......],
J. Vogt,
R. Voss,
C. Whitten,
R. Windmolders,
R. Willumeit,
W. Wiślicki,
A. Witzmann,
A. M. Zanetti,
K. Zaremba,
J. Zhao
[show abstract]
[hide abstract]
ABSTRACT: We present a measurement of the longitudinal spin cross section asymmetry for deep-inelastic muon-nucleon interactions with two high transverse momentum hadrons in the final state. Two methods of event classification are used to increase the contribution of the photon-gluon fusion process to above 30%. The most effective one, based on a neural network approach, provides the asymmetries AplN⃗lhhX=0.030±0.057(stat)±0.010(syst) and AdlN⃗lhhX=0.070±0.076(stat)±0.010(syst). From these values we derive an averaged gluon polarization ΔG/G=-0.20±0.28(stat)±0.10(syst) at an average fraction of nucleon momentum carried by gluons 〈η〉=0.07.
Phys. Rev. D. 07/2004; 70(1).
-
C. E. Allgower,
J. Ball,
M. E. Beddo,
J. Bystrický,
P.-A. Chamouard,
M. Combet,
Ph. Demierre,
J.-M. Fontaine,
D. P. Grosnick,
R. Hess, [......],
A. A. Popov,
A. N. Prokofiev,
D. Rapin,
J.-L. Sans,
H. M. Spinka,
A. Teglia,
Yu. A. Usov,
V. V. Vikhrov,
B. Vuaridel,
A. A. Zhdanov
[show abstract]
[hide abstract]
ABSTRACT: Measurements at 18 beam kinetic energies between 1975 and 2795 MeV and at 795 MeV are reported for the pp elastic scattering spin correlation parameter A00nn=(N,N;0,0)=CNN=ANN. The c.m. angular range is typically 60°-100°. These results are compared to previous data from Saturne II and other accelerators. A search for energy-dependent structure at fixed c.m. angles is performed. Comparisons are made to phase shift analysis and theoretical model predictions of this spin observable.
Phys. Rev. C. 08/2001; 64(3).
-
C. E. Allgower,
J. Ball,
L. S. Barabash,
P.-Y. Beauvais,
M. E. Beddo,
N. Borisov,
A. Boutefnouchet,
J. Bystrický,
P.-A. Chamouard,
M. Combet, [......],
A. A. Popov,
A. N. Prokofiev,
D. Rapin,
J.-L. Sans,
H. M. Spinka,
Yu. A. Usov,
V. V. Vikhrov,
B. Vuaridel,
C. A. Whitten,
A. A. Zhdanov
[show abstract]
[hide abstract]
ABSTRACT: Measurements at 19 beam kinetic energies between 1795 and 2235 MeV are reported for the pp elastic scattering spin correlation parameter A00nn=ANN=CNN. The c.m. angular range is typically 60–100°. The measurements were performed at Saturne II with a vertically polarized beam and target (transverse to the beam direction and scattering plane), a magnetic spectrometer and a recoil detector, both instrumented with multiwire proportional chambers, and beam polarimeters. These results are compared to previous data from Saturne II and elsewhere.
Phys. Rev. C. 11/2000; 62(6).
-
B. Adeva,
E. Arik,
A. Arvidson,
B. Badełek,
G. Baum,
P. Berglund,
L. Betev,
R. Birsa,
N. de Botton,
F. Bradamante, [......],
J. Vogt,
R. Voss,
C. Whitten,
R. Willumeit,
R. Windmolders,
W. Wiślicki,
A. Witzmann,
A. M. Zanetti,
K. Zaremba,
J. Zhao
Physical review D: Particles and fields 09/2000; 62(7):79902.
-
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
-
N. S. Borisov,
A. N. Fedorov,
A. B. Lazarev,
V. N. Matafonov,
A. B. Neganov,
Y. A. Plis,
S. N. Shilov,
Y. A. Usov,
N. A. Bazhanov,
A. I. Kovalev, [......],
A. A. Lukhanin,
J. Černy,
I. Wilhelm,
Z. Janout,
C. Šimane,
M. Vognar,
J. Ball,
G. Durand, F. Lehar,
J. -L. Sans
[show abstract]
[hide abstract]
ABSTRACT: Experience with polarized targets and achieving of very low temperatures gave rise to the idea of using a new technique based
on dissolving 3He in 4He to create a frozen spin polarized target. The short history of the development of such proton and deuteron targets at the
Laboratory of Nuclear Problems (LNP) JINR is given. Recently, the Saclay-Argonne frozen spin proton polarized target used
initially in E704 experiment at FERMILAB was upgraded with adding the missing parts and the first physics experiments was
carried out. At present, a new project is being proposed. The aim of this project is the development of effective methods
of production 6LiD irradiated material for a large volume polarized deuteron target with a high polarization. The research will be carried
out with use of the microtron of Czech Technical University for irradiation and the existing polarized target at Charles University
Nuclear Centre for tests of the target materials.
Czechoslovak Journal of Physics 12/1999; 50:401-408. · 0.42 Impact Factor
-
A. de Lesquen,
C.E. Allgower,
J. Ball,
M. Beddo,
J. Bystrický,
M. Combet,
Ph. Demierre,
G. Durand,
J.-M. Fontaine,
D. Grosnick, [......],
I.L. Pisarev,
A.A. Popov,
A.N. Prokofiev,
D. Rapin,
J.-L. Sans,
H.M. Spinka,
Yu.A. Usov,
V.V. Vikhrov,
B. Vuaridel,
A.A. Zhdanov
[show abstract]
[hide abstract]
ABSTRACT: A polarized proton beam from SATURNE II, the Saclay polarized targets with Li compounds, and an unpolarized target were used to measure spin-dependent observables for protons scattered on bound nucleons. The beam and target polarizations
were oriented vertically. The analyzing power and the depolarization were determined at seven energies between 1.1 and 2.4 GeV. The spin correlation parameter was measured at only 1.1 and 1.6 GeV. Measurements with the target at 1.1 GeV provided data for scattering of polarized protons on neutrons in carbon. The quasi-elastic observables are compared with previous
elastic scattering measurements and at 1.1 GeV with predictions of phase shift analyses.
European Physical Journal C 10/1999; 11(1):69-78. · 3.63 Impact Factor
-
C.E. Allgower,
M.E. Beddo,
D.P. Grosnick,
T.E. Kasprzyk,
D. Lopiano,
H.M. Spinka,
J. Ball,
P. Beauvais,
Y. Bedfer,
P. Chamouard, [......],
V. Ghazikhanian,
C.A. Whitten,
P. Demierre,
R. Hess,
Z.F. Janout,
D. Rapin,
B. Vuaridel,
A.N. Prokofiev,
V.V. Vikhrov,
A.A. Zhdanov
[show abstract]
[hide abstract]
ABSTRACT: Experimental results are presented for the pp elastic-scattering single spin observable A{sub oono}=A{sub ooon}=A{sub N}=P, or the analyzing power, at 19 beam kinetic energies between 1795 and 2235 MeV. The typical c.m. angular range is 60{endash}100{degree}. The measurements were performed at Saturne II with a vertically polarized beam and target (transverse to the beam direction and scattering plane), a magnetic spectrometer and a recoil detector, both instrumented with multiwire proportional chambers, and beam polarimeters. {copyright} {ital 1999} {ital The American Physical Society}
Physical Review, C. 10/1999; 60(5).
-
J. Ball,
C.E. Allgower,
M. Beddo,
J. Bystrický,
M. Combet,
Ph. Demierre,
G. Durand,
J.-M. Fontaine,
D. Grosnick,
R. Hess, [......],
I.L. Pisarev,
A.A. Popov,
A.N. Prokofiev,
D. Rapin,
J.-L. Sans,
H.M. Spinka,
Yu.A. Usov,
V.V. Vikhrov,
B. Vuaridel,
A.A. Zhdanov
[show abstract]
[hide abstract]
ABSTRACT: A polarized proton beam extracted from SATURNE II, the Saclay polarized target with Li compounds, and a target were used to measure elastic and quasi-elastic pp spin-dependent observables in the angular region . The beam and/or target polarizations were oriented vertically. Accurate pp data for the analyzing power , spin-correlation parameter , and the polarization transfer were measured at 1.1 GeV. The observables and were determined at six other energies between 1.6 and 2.4 GeV. At 1.6 GeV, was also obtained. The individual contributions from H, Li, and LiD were deduced. The target provided results on free hydrogen and on protons in carbon. The elastic and quasi-elastic observables are compared with existing data
and with phase-shift analysis predictions.
European Physical Journal C 10/1999; 11(1):51-67. · 3.63 Impact Factor
-
C. E. Allgower,
J. Ball,
M. E. Beddo,
J. Bystrický,
P.-A. Chamouard,
M. Combet,
Ph. Demierre,
J.-M. Fontaine,
D. P. Grosnick,
R. Hess, [......],
A. A. Popov,
A. N. Prokofiev,
D. Rapin,
J.-L. Sans,
H. M. Spinka,
A. Teglia,
Yu. A. Usov,
V. V. Vikhrov,
B. Vuaridel,
A. A. Zhdanov
[show abstract]
[hide abstract]
ABSTRACT: Measurements at 18 beam kinetic energies between 1975 and 2795 MeV and at 795 MeV are reported for the pp elastic-scattering single spin parameter Aooon=Aoono=AN=P. The c.m. angular range is typically 60–100°. These results are compared to previous data from Saturne II and other accelerators. A search for energy-dependent structure at fixed c.m. angles is performed, but no rapid changes are observed.
Phys. Rev. C. 10/1999; 60(5).
-
C. E. Allgower,
J. Ball,
L. S. Barabash,
P.-Y. Beauvais,
M. E. Beddo,
Y. Bedfer,
N. Borisov,
A. Boutefnouchet,
J. Bystrický,
P.-A. Chamouard, [......],
A. A. Popov,
A. N. Prokofiev,
D. Rapin,
J.-L. Sans,
H. M. Spinka,
Yu. A. Usov,
V. V. Vikhrov,
B. Vuaridel,
C. A. Whitten,
A. A. Zhdanov
[show abstract]
[hide abstract]
ABSTRACT: Experimental results are presented for the pp elastic-scattering single spin observable Aoono=Aooon=AN=P, or the analyzing power, at 19 beam kinetic energies between 1795 and 2235 MeV. The typical c.m. angular range is 60–100°. The measurements were performed at Saturne II with a vertically polarized beam and target (transverse to the beam direction and scattering plane), a magnetic spectrometer and a recoil detector, both instrumented with multiwire proportional chambers, and beam polarimeters.
Phys. Rev. C. 10/1999; 60(5).
-
B. Adeva,
E. Arik,
A. Arvidson,
B. Badełek,
G. Baum,
P. Berglund,
L. Betev,
R. Birsa,
N. de Botton,
F. Bradamante, [......],
J. Vogt,
R. Voss,
C. Whitten,
R. Willumeit,
R. Windmolders,
W. Wiślicki,
A. Witzmann,
A. M. Zanetti,
K. Zaremba,
J. Zhao
[show abstract]
[hide abstract]
ABSTRACT: We present the results of the spin asymmetries A1 of the proton and the deuteron in the kinematic region extending down to x=6×10-5 and Q2=0.01GeV2. The data were taken with a dedicated low x trigger, which required hadron detection in addition to the scattered muon, so as to reduce the background at low x. The results complement our previous measurements and the two sets are consistent in the overlap region. No significant spin effects are found in the newly explored region.
Phys. Rev. D. 09/1999; 60(7).
-
A. N. Prokofiev,
C. E. Allgower,
L. S. Azhgirej,
J. Ball,
M. Beddo,
Y. Bedfer,
A. Boutefnouchet,
J. Bystricky,
Ph. Demierre,
J. -M. Fontaine, [......],
D. Rapin,
J. -L. Sans,
H. M. Spinka,
G. D. Stoletov,
S. Trentalange,
Yu. A. Usov,
V. V. Vikhrov,
B. Vuaridel,
C. A. Whitten,
A. A. Zhdanov
[show abstract]
[hide abstract]
ABSTRACT: Method and results of the beam polarization measurements are presented. The measurements were carried out at the proton polarized
beam of Saturne-II accelerator as well as at the JINR (Dubna) synchrophasotron vector polarized deuteron beam. The analysis of the elastic (quasi-elastic)
pp-scattering polarization is used as a method of the polarization measurements. The energy range of the measurement is 1.0≤T
p
≤2.8 GeV for polarized proton and 1.66≤T
d
≤7.3 GeV for polarized deuteron beams.
Czechoslovak Journal of Physics 01/1999; 49:29-36. · 0.42 Impact Factor
