- Conference date: 19-23 June 1978
- Location: Winnipeg, Canada
Measurements have been made of the cross section and asymmetry of the 40Ca(p↘,2p) reaction. Peaks corresponding to the knockout of protons from the 1d3/2, 1d5/2 and 2s1/2 shells are seen. By comparing the asymmetry for protons from the 2s1/2 shell with that arising from free p‐p scattering, information on spin orbit distortion effects is obtained.
This experiment was performed using a 200 MeV polarized proton beam from the TRIUMF cyclotron. The polarization and interacting of the incident beam were monitored in a polarimeter and an ion chamber. The energies and angles of outgoing protons were measured by four detector telescopes consisting of plastic scintillation counters, multi‐wire proportional chambers, and 75 mm thick × 125 mm diameter NaI (Tl) scintillation crystals. Coincidences between particles traversing detector telescopes on opposite sides of the beam line were recorded. Missing energy spectra for events with recoil momenta ∠ 0 MeV/c and ∠ 100 MeV/c are shown in Figures I(a) and I(b) respectively. In the first case, in which states with l=0 are enhanced, one can see a peak arising from protons scattered from hydrogen contamination in the target at Emiss=0 and a peak arising from knockout of 2s1/2 protons in 40Ca. In Figure I(b) states with l≠0 are enhanced and peaks corresponding to knockout of 1d3/2 and 1d5/2 protons are seen. The asymmetries of these peaks are qualitatively in agreement with what one might expect from the ’Maris’ effect. The asymmetry for protons knocked out from the 2s1/2 state is compared with the free p‐p elastic scattering asymmetry (Figure II).
- Scintillation detectors
- Chemical reaction cross sections
Y. K. Semertzidis, M. Aoki, M. Auzinsh, V. Balakin, A. Bazhan, G. W. Bennett, R. M. Carey, P. Cushman, P. T. Debevec, A. Dudnikov, F. J. M. Farley, D. W. Hertzog, M. Iwasaki, K. Jungmann, D. Kawall, B. Khazin, I. B. Khriplovich, B. Kirk, Y. Kuno, D. M. Lazarus, L. B. Leipuner, V. Logashenko, K. R. Lynch, W. J. Marciano, R. McNabb, W. Meng, J. P. Miller, W. M. Morse, C. J. G. Onderwater, Y. F. Orlov, C. S. Ozben, R. Prigl, S. Rescia, B. L. Roberts, N. Shafer‐Ray, A. Silenko, E. J. Stephenson, K. Yoshimura and EDM Collaboration
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