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1. Measurements of the total-cross-section difference Δσ L(np) at 1.39, 1.69, 1.89, and 1.99 GeV

Author

F. Lehar, A. A. Lukhanin, A. L. Svetov, M. FingerJr., N. G. Anischenko, N. A. Bazhanov, G. P. Nikolaevsky, A.A. Zhdanov, P. K. Maniakov, V. P. Ladygin, A. D. Kirillov, I. P. Yudin, Alexander Fedorov, V.F. Chumakov, A. A. Nomofilov, R. A. Shindin, T. A. Vasiliev, Vladislav Sharov, O. N. Schevelev, A. B. Neganov, Yu. A. Plis, A. Janata, E. V. Chernykh, A.N. Livanov, L. B. Golovanov, G. M. Gurevich, N. S. Borisov, V.I. Volkov, Yu. P. Polunin, A. A. Morozov, M. Finger, V. A. Krasnov, V. Yu. Prytkov, V. Slunečková, E. I. Vorobiev, V. G. Kolomiets, N.A. Blinov, I.L. Pisarev, V. A. Schedrov, L. P. Chernenko, I.V. Zaitsev, E.V. Komogorov, S. B. Borzakov, V.D. Moroz, L. S. Azhgirey, A. N. Prokofiev, Alexander Kovalenko, G.D. Stoletov, A. de Lesquen, S.A. Averichev, V.N. Matafonov, A.I. Kovalev, S.A. Dolgii, Yu. K. Pilipenko, A.A. Belyaev, Yu. T. Borzunov, L. N. Strunov, V. V. Fimushkin, V.D. Bartenev, S. N. Shilov, A. B. Lazarev, M. Slunecka, Yu. P. Bushuev, A.Yu. Starikov, Yu. A. Usov, P. Krstonoshich, E. S. Kuzmin, M.Yu. Liburg, V.G. Antonenko, P. A. Rukoyatkin, V. N. Zhmyrov, E. A. Matyushevsky, and Tz. Panteleev

Subjects
Physics, Nuclear and High Energy Physics, Nuclotron, Proton, Hadron, Neutron radiation, Kinetic energy, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, law, Neutron, Synchrophasotron, Nuclear Experiment, Nucleon
Abstract

New accurate data of the neutron-proton spin-dependent total-cross-section difference ΔσL(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 ΔσL(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 −ΔσL(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 ΔσL quantities for isosinglet state I = 0, deduced from the measured ΔσL(np) values and known ΔσL(pp) data, are also given. The results of the measurements of unpolarized total cross sections σ0tot(np) at 1.3, 1.4, and 1.5 GeV and σ0tot(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.

Published
2005
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2. Measurement of the np total cross section difference $\Delta\sigma_{\mathrm L}(np)$ at 1.39, 1.69, 1.89 and 1.99 GeV

Author

Yu. A. Usov, A. L. Svetov, S.A. Dolgii, N.A. Blinov, E. V. Chernykh, G. P. Nikolaevsky, Yu. K. Pilipenko, P. Krstonoshich, S. N. Shilov, V. P. Ladygin, S. B. Borzakov, N. S. Borisov, L.P. Chernenko, E. I. Vorobiev, A. A. Morozov, L. S. Azhgirey, V. N. Zhmyrov, N. A. Bazhanov, V.I. Volkov, A.Yu. Starikov, M. Slunečka, A.A. Belyaev, A. B. Lazarev, F. Lehar, Vladislav Sharov, A.A. Zhdanov, A. A. Lukhanin, Yu. T. Borzunov, P. K. Maniakov, V. G. Kolomiets, L. B. Golovanov, I.V. Zaitsev, T. Vasiliev, Tz. Panteleev, A. de Lesquen, V.D. Moroz, G. D. Stoletov, Alexander Fedorov, A. N. Prokofiev, E. S. Kuzmin, A.I. Kovalev, N. G. Anischenko, L. N. Strunov, Yu. A. Plis, M. Finger, A. Janata, Alexander Kovalenko, V. V. Fimushkin, A. A. Nomofilov, Yu. P. Polunin, R. A. Shindin, V. Slunečková, S.A. Averichev, V.N. Matafonov, A. B. Neganov, V.G. Antonenko, P. A. Rukoyatkin, G. M. Gurevich, I.L. Pisarev, E. A. Matyushevsky, I. P. Yudin, Yu.P. Bushuev, E.V. Komogorov, V. A. Schedrov, V. A. Krasnov, A. D. Kirillov, V.F. Chumakov, M.Yu. Liburg, O. N. Schevelev, A.N. Livanov, V. Yu. Prytkov, and V.D. Bartenev

Subjects
Physics, Particle physics, Nuclotron, Physics and Astronomy (miscellaneous), Sigma, Neutron radiation, Kinetic energy, Polarization (waves), law.invention, Nuclear physics, Deuterium, law, Neutron, Synchrophasotron, Nuclear Experiment, Engineering (miscellaneous)
Abstract

New accurate results of the neutron-proton spin-dependent total cross section difference $\Delta\sigma_{\mathrm L}(np)$ 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 $\Delta\sigma_{\mathrm L}(np)$ with increasing energy above 1.1 GeV was confirmed. The structure in the $\Delta\sigma_{\mathrm L}(np)$ 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 $\Delta\sigma_{\mathrm L}$ quantities for isosinglet state I = 0, deduced from the measured $\Delta\sigma_{\mathrm L}(np)$ values and the known $\Delta\sigma_{\mathrm L}(pp)$ data, are also given. The results were completed by the measurements of unpolarized total cross sections $\sigma_{0\mathrm{tot}}(np)$ at 1.3, 1.4 and 1.5 GeV and $\sigma_{0\mathrm{tot}}(n$ 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.

Published
2004
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3. Measurements of energy behaviour of spin-dependent np observables over a GeV region. Results and prospects. Dubna 'DELTA—SIGMA' experiment

Author

Yu. K. Pilipenko, M. Finger, N.A. Bazhanov, Yu. T. Borzunov, L.P. Chernenko, E. I. Vorobiev, V. N. Zhmyrov, V. I. Sharov, L. B. Golovanov, N. I. Kochelev, Yu.P. Bushuev, V. M. Drobin, T. N. Borzunova, A.I. Kovalev, S. A. Zaporozhets, Tz. Panteleev, V.D. Bartenev, T. F. Pavlova, E. S. Kuzmin, E. V. Chernykh, S.A. Averichev, Alexander Fedorov, V. B. Shutov, F. Lehar, V.N. Matafonov, S. N. Shilov, S. B. Borzakov, A. N. Prokofiev, P. A. Rukoyatkin, A. D. Kovalenko, L. S. Azhgirey, I. P. Yudin, A.A. Zhdanov, A. A. Lukhanin, A.Yu. Starikov, I. G. Konskii, A. L. Svetov, M. Slunecka, L. N. Strunov, R. V. Polyakova, I.V. Zaitsev, V. V. Fimushkin, S.A. Dolgii, E. I. Bunyatova, P. K. Maniakov, A. de Lesquen, A. B. Lazarev, N. S. Borisov, V.I. Volkov, A. P. Dzyubak, Yu. A. Plis, V.P. Ladygin, A. Janata, T. V. Shavrina, Yu. P. Polunin, V. Slunečková, V. G. Kolomiets, Yu. A. Usov, B. A. Khachaturov, B. P. Adiasevich, V.G. Antonenko, N. G. Anischenko, E. A. Matyushevsky, V. F. Burinov, G. Durand, V. V. Orlova, A. A. Nomofilov, V. P. Yershov, A. B. Neganov, I.L. Pisarev, A. D. Kirillov, V.F. Chumakov, O. N. Schevelev, V. A. Schedrov, G. D. Stoletov, G. M. Gurevich, V. Yu. Prytkov, Yu. A. Starikov, N.A. Blinov, G. P. Nikolaevsky, and Z. P. Motina

Subjects
Physics, Particle physics, Scattering, Forward scatter, General Physics and Astronomy, Observable, Neutron radiation, Polarization (waves), Nuclear physics, Amplitude, Isospin, Physics::Accelerator Physics, Neutron, Nuclear Experiment
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.

Published
2001
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4. Measurements of the np total cross section difference $\Delta \sigma_L$ at 1.59, 1.79 and 2.20 GeV

Author

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, S.B. Borzakov, Yu.T. Borzunov, L.V. Budkin, V.F. Burinov, Yu.P. Bushuev, L.P. Chernenko, E.V. Chernykh, S.A. Dolgii, V.M. Drobin, G. Durand, A.P. Dzyubak, A.N. Fedorov, V.V. Fimushkin, M. Finger, L.B. Golovanov, G.M. Gurevich, A. Janata, A.V. Karpunin, B.A. Khachaturov, A.D. Kirillov, A.D. Kovalenko, A.I. Kovalev, V.G. Kolomiets, A.A. Kochetkov, E.S. Kuzmin, V.P. Ladygin, A.B. Lazarev, F. Lehar, A. de Lesquen, A.A. Lukhanin, P.K. Maniakov, V.N. Matafonov, A.B. Neganov, M.S. Nikitina, G.P. Nikolaevsky, A.A. Nomofilov, Tz. Panteleev, Yu.K. Pilipenko, I.L. Pisarev, N.M. Piskunov, Yu.A. Plis, Yu.P. Polunin, A.N. Prokofiev, P.A. Rukoyatkin, O.N. Shchevelev, V.A. Shchedrov, S.N. Shilov, Yu.A. Shishov, V.B. Shutov, M. Slunečka, V. Slunečková, 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, and V.N. Zhmyrov

Subjects
Nuclear reaction, Physics, Physics and Astronomy (miscellaneous), Sigma, Kinetic energy, law.invention, Nuclear physics, Amplitude, Deuterium, law, High Energy Physics::Experiment, Neutron, Synchrophasotron, Nuclear Experiment, Engineering (miscellaneous), Beam (structure)
Abstract

New results of the neutron-proton spin-dependent total cross section difference $\Delta\sigma_L(np)$ 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 $-\Delta\sigma_L(np)$ 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 $\Delta\sigma_L$ quantities for isosinglet state I=0, deduced from the measured $\Delta\sigma_L(np)$ values and known $\Delta\sigma_L(pp)$ data, are given.

Published
2000
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5. Measurement of the total cross section differenceΔσ L innp transmission at 1.19, 2.49 and 3.65 GeV

Author

M. V. Kulikov, V. P. Yershov, T.E. Kasprzyk, A. B. Neganov, A.D. Kirillov, A. P. Tsvinev, G. M. Gurevich, A. P. Dzyubak, V. F. Burinov, J.M. Fontaine, Alexander Fedorov, G. Durand, B.A. Khachaturov, Yu. K. Pilipenko, L. S. Azhgirey, M.Yu. Liburg, V. V. Teterin, V. V. Glagolev, L.B. Golovanov, V.G. Antonenko, S. A. Zaporozhets, S.A. Dolgii, B. Benda, D. Grosnick, S. V. Mironov, N. I. Kochelev, A.A. Nomofilov, E.V. Chernykh, V. B. Shutov, E.A. Matyushevsky, P.A. Rukoyatkin, Pavel Sorokin, Yu.T. Borzunov, S.N. Shilov, D. Hill, Yu. P. Polunin, Yu. A. Plis, A.A. Zhdanov, V. V. Polyakov, A.I. Kovalev, D. Lopiano, J.-L. Sans, B. P. Adiasevich, L.N. Strunov, D. A. Ronzhin, E. I. Bunyatova, I. L. Pisarev, G. P. Nikolaevsky, Vladislav Sharov, P. K. Maniakov, F. Lehar, A. Yershov, A.L. Svetov, V. Yu. Trautman, S. V. Topalov, Yu.A. Shishov, A.Yu. Starikov, H. M. Spinka, N.A. Bazhanov, A. A. Lukhanin, E. A. Strokovsky, S.A. Averichev, N. M. Piskunov, V.N. Matafonov, A. N. Prokofiev, Alexander Kovalenko, G.M. Mgebrishvili, G.D. Stoletov, A. de Lesquen, A. V. Karpunin, A. B. Lazarev, V. V. Fimushkin, V.V. Vikhrov, Yu. A. Usov, N. S. Borisov, V.I. Volkov, J. Ball, and V. P. Ladygin

Subjects
Physics, Physics and Astronomy (miscellaneous), Proton, Neutron radiation, Kinetic energy, law.invention, Nuclear physics, Cross section (physics), law, Isospin, Neutron, Synchrophasotron, Atomic physics, Nuclear Experiment, Beam (structure)
Abstract

Results of the total cross section differenceΔσL in anp transmission experiment at 1.19, 2.49 and 3.65 GeV incident neutron beam kinetic energies are presented. Measurements were performed at the Synchrophasotron of the Laboratory of High Energies of the Joint Institute for Nuclear Research in Dubna. Results were obtained with a polarized beam of free quasi-monochromatic neutrons passing through the new Dubna frozen spin proton target. The beam and target polarizations were oriented longitudinally. The present results were obtained at the highest energies of free polarized neutrons that can be reached at present. They extend the energy range of existing results from PSI, LAMPF and Saclay measured between 0.066 and 1.10 GeV. The new results are compared withΔσL(pn) data determined as a difference betweenΔσL(pd) andΔσL(pp) ANL-ZGS measurements. The values ofΔσL for the isospin stateI=0 were deduced using knownpp data.

Published
1996
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6. Dubna 'Delta-Sigma' Experiment: Results Of Treatment And Analysis Of Statistics Accumulated In 2001 Data Taking Run On Energy Dependence Of ΔσL(np)

Author

F. Lehar, N. S. Borisov, V. A. Schedrov, V. N. Zhmyrov, A.A. Nomofilov, V.I. Volkov, A.L. Svetov, V. A. Krasnov, Yu.A. Shishov, A. B. Lazarev, A. Janata, V. G. Kolomiets, E. S. Kuzmin, L.N. Strunov, P.A. Rukoyatkin, E.V. Komogorov, A. A. Morozov, E.A. Matyushevsky, M.Yu. Liburg, L.P. Chernenko, N.A. Blinov, G. P. Nikolaevsky, A.Yu. Starikov, E. I. Vorobiev, V.D. Bartenev, L.B. Golovanov, A.D. Kirillov, V. Slunečková, Yu.P. Bushuev, L. S. Azhgirey, Alexander Fedorov, A.A. Lukhanin, V. P. Ladygin, S.A. Averichev, G. M. Gurevich, R. A. Shindin, P. Krstonoshich, V.F. Chumakov, E.V. Chernykh, V.N. Matafonov, Yu.A. Usov, Yu.T. Borzunov, O. N. Schevelev, A. B. Neganov, A.N. Livanov, I.V. Zaitsev, Yu. A. Plis, V. V. Fimushkin, V. Yu. Prytkov, A.A. Zhdanov, P. K. Maniakov, A.I. Kovalev, V.G. Antonenko, S. B. Borzakov, V.D. Moroz, M. Finger, G.D. Stoletov, A. de Lesquen, Tz. Panteleev, N. G. Anischenko, A. N. Prokofiev, S.A. Dolgii, I. P. Yudin, Alexander Kovalenko, Yu. K. Pilipenko, S.N. Shilov, I. L. Pisarev, A.A. Belyaev, N.A. Bazhanov, Vladislav Sharov, Yu.P. Polunin, V. B. Shutov, T. A. Vasiliev, and M. Slunečka

Subjects
Nuclear physics, Nuclear reaction, Physics, Particle physics, Particle properties, Observational error, Russian federation, Delta-sigma modulation, Energy (signal processing)
Published
2003
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