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Delta-Sigma experiment

Delta-Sigma experiment. First measurement of the cross section ratio in charge-exchange (np) reactions on H 2 /D 2 at 0 ° and T = 1, 1.2 GeV Dubna, Joint Institute for Nuclear Research Veksler and Baldin Laboratory of High Energies Morozov A.A.

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Delta-Sigma experiment

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  1. Delta-Sigma experiment First measurement of the cross section ratio in charge-exchange (np) reactions on H2/D2 at 0° and T = 1, 1.2 GeV Dubna, Joint Institute for Nuclear Research Veksler and Baldin Laboratory of High Energies Morozov A.A.

  2. Participants of the Dubna "DELTA-SIGMA" Experiment S.A.Averichev, L.S.Azhgirey, N.G.Anischenko, V.D.Bartenev, N.A.Blinov, N.S.Borisov, S.B.Borzakov, Yu.T.Borzunov, Yu.P.Bushuev, L.P.Chernenko, E.V.Chernykh, V.F.Chumakov, L.B.Golovanov, A.Janata, S.A.Dolgii, A.N.Fedorov, V.V.Fimushkin, M.Finger, M.Finger Jr, A.D.Kirillov, A.D.Kovalenko, V.G.Kolomiets, N.I.Kochelev, V.A.Krasnov, P.Krstonosich, E.S.Kuzmin, N.A.Kuzmin, V.P.Ladygin, A.B.Lazarev, A.N.Livanov, P.K.Maniakov, V.N.Matafonov, E.A.Matyushevsky, A.A.Morozov, A.B.Neganov, G.P.Nikolaevsky, A.A.Nomofilov, Tz.Panteleev, Yu.K.Pilipenko, I.L.Pisarev, Yu.A.Plis, V.Yu.Prytkov, P.A.Rukoyatkin, A.L.Svetov, M.Slunechka, V.Slunechkova, A.Yu.Starikov, L.N.Strunov, V.I.Sharov, S.N.Shilov, R.A.Shindin, Yu.A.Usov, T.A.Vasiliev, V.I.Volkov, E.I.Vorobiev, I.P.Yudin, V.N.Zhmyrov, I.V.Zaitsev. Joint Institute for Nuclear Research, Dubna V.G.Baryshevsky, K.G.Batrakov, T.I.Klimkovich, S.L.Cherkas RNNP,Belorussian State University, Belorussia N.A.Bazhanov, A.A.Zhdanov, A.I.Kovalev, A.N.Prokofiev, V.A.Schedrov Peterburg Institute of Nuclear Physics, Gatchina G.M.Gurevich Institute for Nuclear Research, RAS, Moscow V.G.Antonenko, Yu.P.Polunin Russian Scientific Center "Kurchatov Institute", Moscow G.Durand, F.Lehar. A. de Lesquen DAPNIA, Saclay, France A.P.Dzyubak, A.A.Lukhanin Kharkov Institute of Physics and Technology, Kharkov, Ukraine

  3. The Delta-Sigma Experiment Research Program

  4. The Delta-Sigma Experiment Research Program

  5. Delta-Sigma spectrometer

  6. Delta-Sigma spectrometer

  7. System for Target Surrounding

  8. The momentum spectra of deuteron beam, used for calibration of the spectrometer

  9. The momentum spectra of charged particles , detected by spectrometer using H2 and D2 liquid targets, at the neutron beam energy of 1.0 GeV. The main contribution in background (inelastic) peak is due to the binary reaction with excitation of Δ°-resonance.

  10. The momentum spectra of charged particles , detected by spectrometer using H2 and D2 liquid targets, at the neutron beam energy of 1.2 GeV. The main contribution in background (inelastic) peak is due to the binary reaction with excitation of Δ°-resonance.

  11. Time-of-FlightSystem

  12. Time-of-FlightSystem

  13. Time-of-FlightSystem

  14. Detected Events Distribution in the θ vs φ Plane

  15. Differential cross section and ratio Rdp calculation

  16. Angular dependence of differential cross section of the np→pn process near 0°, obtained with H2 and D2 targets at Tn = 1.0 GeV.

  17. Angular dependence of differential cross section of the np→pn process near 0°, obtained with H2 and D2 targets at Tn = 1.0 GeV.

  18. The ratio Rdp at neutron energy Tn =1 GeV. The ratio Rdp(0) was obtained by the extrapolation of the direct line approximating of experimental Rdp(θ) data (with χ2≈ 0.5) Rdp(0)=0.52 ± 0.02

  19. The ratio Rdp at neutron energy Tn =1.2 GeV. The ratio Rdp(0) was obtained by the extrapolation of the direct line approximating of experimental Rdp(θ) data (with χ2≈ 0.5) Rdp(0)=0.5 ± 0.02

  20. Results • Our preliminary results on the momentum spectra of elastic charge exchange protons with H2 target and corresponding dσ/dΩ(np) at 1.0 and 1.2 GeV are in agreement with the existing data: [1] G. Bizard, F. Bonthonneau, J.L. Laville et al.: Nucl.Phys. B 85 (1975) 14. [2] G. Bizard, F. Bonthonneau, J.L. Laville et al.: Nucl.Phys. B 108 (1976) 189.

  21. Results • Preliminary results of measurements of the ratio Rdp=dσ/dΩ(np) / dσ/dΩ(nd) at 0° were obtained at the first time at Tn≥1 GeV. Rdp(0)=0.52± 0.02 (Tn = 1 GeV) Rdp(0)=0.50± 0.02 (Tn = 1.2 GeV)

  22. Results

  23. Conclusion A number of physical and methodical results on investigation of the elastic np→pn charge-exchange process over a few GeV region are presented. The possibilities for A00kk(np), A00nn(np) and Rdp measurements, using prepared magnetic spectrometer, were demonstrated. --------------------------------------------------------------------------------------------------------- We are grateful to the JINR, JINR VBLHE and DLNP Directorates for these investigations support. The investigations were supported in part by the Russian Foundation for Basic Research (Grant № 02–02–17129).

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