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Title: Measurements of the Total-Cross-Section Difference {delta}{sigma}{sub L}(np) at 1.39, 1.69, 1.89, and 1.99 GeV

Abstract

New accurate data of the neutron-proton spin-dependent total-cross-section difference {delta}{sigma}{sub 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 {delta}{sigma}{sub 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 -{delta}{sigma}{sub 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 withmore » phase-shift analysis fits. The {delta}{sigma}{sub L} quantities for isosinglet state I = 0, deduced from the measured {delta}{sigma}{sub L}(np) values and known {delta}{sigma}{sub L}(pp) data, are also given. The results of the measurements of unpolarized total cross sections {sigma}{sub 0tot}(np) at 1.3, 1.4, and 1.5 GeV and {sigma}{sub 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.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Veksler and Baldin Laboratory of High Energies, Joint Institute for Nuclear Research, Dubna, Moscow oblast, 141980 (Russian Federation) [and others
Publication Date:
OSTI Identifier:
20692902
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Atomic Nuclei; Journal Volume: 68; Journal Issue: 11; Other Information: Translated from Yadernaya Fizika, ISSN 0044-0027, 68, 1858-1873 (No. 11, 2005); DOI: 10.1134/1.2131111; (c) 2005 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); TN:
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DEUTERON BEAMS; DEUTERONS; DUBNA; ENERGY DEPENDENCE; GEV RANGE; PHASE SHIFT; POLARIZATION; POLARIZED TARGETS; PROTON-NEUTRON INTERACTIONS; PROTONS; SPIN; TOTAL CROSS SECTIONS

Citation Formats

Sharov, V.I., Anischenko, N.G., Averichev, S.A., Bartenev, V.D., Blinov, N.A., Borzunov, Yu.T., Chernykh, E.V., Chumakov, V.F., Dolgii, S.A., Fimushkin, V.V., Golovanov, L.B., Kirillov, A.D., Komogorov, E.V., Kovalenko, A.D., Krasnov, V.A., Ladygin, V.P., Liburg, M.Yu., Livanov, A.N., Maniakov, P.K., and Matyushevsky, E.A.. Measurements of the Total-Cross-Section Difference {delta}{sigma}{sub L}(np) at 1.39, 1.69, 1.89, and 1.99 GeV. United States: N. p., 2005. Web. doi:10.1134/1.2131111.
Sharov, V.I., Anischenko, N.G., Averichev, S.A., Bartenev, V.D., Blinov, N.A., Borzunov, Yu.T., Chernykh, E.V., Chumakov, V.F., Dolgii, S.A., Fimushkin, V.V., Golovanov, L.B., Kirillov, A.D., Komogorov, E.V., Kovalenko, A.D., Krasnov, V.A., Ladygin, V.P., Liburg, M.Yu., Livanov, A.N., Maniakov, P.K., & Matyushevsky, E.A.. Measurements of the Total-Cross-Section Difference {delta}{sigma}{sub L}(np) at 1.39, 1.69, 1.89, and 1.99 GeV. United States. doi:10.1134/1.2131111.
Sharov, V.I., Anischenko, N.G., Averichev, S.A., Bartenev, V.D., Blinov, N.A., Borzunov, Yu.T., Chernykh, E.V., Chumakov, V.F., Dolgii, S.A., Fimushkin, V.V., Golovanov, L.B., Kirillov, A.D., Komogorov, E.V., Kovalenko, A.D., Krasnov, V.A., Ladygin, V.P., Liburg, M.Yu., Livanov, A.N., Maniakov, P.K., and Matyushevsky, E.A.. Tue . "Measurements of the Total-Cross-Section Difference {delta}{sigma}{sub L}(np) at 1.39, 1.69, 1.89, and 1.99 GeV". United States. doi:10.1134/1.2131111.
@article{osti_20692902,
title = {Measurements of the Total-Cross-Section Difference {delta}{sigma}{sub L}(np) at 1.39, 1.69, 1.89, and 1.99 GeV},
author = {Sharov, V.I. and Anischenko, N.G. and Averichev, S.A. and Bartenev, V.D. and Blinov, N.A. and Borzunov, Yu.T. and Chernykh, E.V. and Chumakov, V.F. and Dolgii, S.A. and Fimushkin, V.V. and Golovanov, L.B. and Kirillov, A.D. and Komogorov, E.V. and Kovalenko, A.D. and Krasnov, V.A. and Ladygin, V.P. and Liburg, M.Yu. and Livanov, A.N. and Maniakov, P.K. and Matyushevsky, E.A.},
abstractNote = {New accurate data of the neutron-proton spin-dependent total-cross-section difference {delta}{sigma}{sub 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 {delta}{sigma}{sub 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 -{delta}{sigma}{sub 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 {delta}{sigma}{sub L} quantities for isosinglet state I = 0, deduced from the measured {delta}{sigma}{sub L}(np) values and known {delta}{sigma}{sub L}(pp) data, are also given. The results of the measurements of unpolarized total cross sections {sigma}{sub 0tot}(np) at 1.3, 1.4, and 1.5 GeV and {sigma}{sub 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.},
doi = {10.1134/1.2131111},
journal = {Physics of Atomic Nuclei},
number = 11,
volume = 68,
place = {United States},
year = {Tue Nov 01 00:00:00 EST 2005},
month = {Tue Nov 01 00:00:00 EST 2005}
}