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2 results on '"S.A. Dolgii"'

1. 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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2. 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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