Spin transfer measurements of the pi anti-d ---> anti-p p reaction at energies spanning the Delta resonance

Feltham, A. ; Jones, G. ; Olszewski, R. ; et al.
Phys.Rev.C 55 (1997) 19-41, 1997.
Inspire Record 456889 DOI 10.17182/hepdata.25720

The first spin-transfer experiment performed for the πd→→p→p reaction is described. Three spin-transfer parameters for this π-absorption process were determined, KLSa, KSSa, and KNNa, which correspond to the π-production parameters, KSLp, KSSp, and KNNp, of the time-reversed p→p→d→π process. Each observable was measured at a single angle for a number of energies spanning the Δ resonance of this system. The results are compared with the predictions of published partial wave amplitude fits which are primarily based on existing data for the time-reversed pp→dπ reaction, and also with the predictions of two current theories. The failure of these theories to describe the fundamental features of the data clearly demonstrates the need for further theoretical work in this area.

3 data tables

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The Absorption of Pions by Deuterons

Durbin, R. ; Loar, H. ; Steinberger, J. ;
Phys.Rev. 84 (1951) 581-581, 1951.
Inspire Record 47326 DOI 10.17182/hepdata.26473

None

4 data tables

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pi+ + d --> p + p reaction between 18-MeV and 44-MeV.

Pasyuk, E.A. ; Alexakhin, V.Yu. ; Gogolev, S.I. ; et al.
Phys.Rev.C 55 (1997) 1026-1032, 1997.
Inspire Record 425528 DOI 10.17182/hepdata.25740

A study of the reaction pi+ + d --> p + p has been performed in the energy range of 18 - 44 MeV. Total cross sections and differential cross sections at six angles have been measured at 15 energies with an energy increment of 1 - 2 MeV. This is the most systematic data set in this energy range. No structure in the energy dependence of the cross section has been observed within the accuracy of this experiment.

16 data tables

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A Large Solid Angle Study of Pion Absorption on He3

The LADS collaboration Alteholz, T. ; Androic, D. ; Backenstoss, G. ; et al.
Phys.Rev.Lett. 73 (1994) 1336-1339, 1994.
Inspire Record 372679 DOI 10.17182/hepdata.19679

Measurements have been made of pi+ absorption on He3 at T_pi+ = 118, 162, and 239 MeV using the Large Acceptance Detector System (LADS). The nearly 4pi solid angle coverage of this detector minimizes uncertainties associated with extrapolations over unmeasured regions of phase space. The total absorption cross section is reported. In addition, the total cross section is divided into components in which only two or all three nucleons play a significant role in the process. These are the first direct measurements of the total and three nucleon absorption cross sections.

2 data tables

ABSORPTION CROSS SECTION.

ABSORPTION CROSS SECTION.


Total cross-section of the reaction pi+ d ---> p p at pion energies 26-MeV to 40-MeV

Gogolev, S.I. ; Gostkin, M.I. ; Haysak, I.I. ; et al.
Phys.Lett.B 300 (1993) 24-28, 1993.
Inspire Record 361849 DOI 10.17182/hepdata.28959

Total cross sections for the reaction π + d → pp have been measured for incident pion energies T π =26.5, 28.5, 30.5, 32.5 and 39.5 MeV. The data are in good agreement with previous experiments. There is some indication of a peculiarity in the energy dependence of the total cross section near incident pion energy T π =30 MeV.

1 data table

Statistical errors only. Systematic error is estimated as < 8 pct.


Proton polarization from pi+ absorption in He-3

MayTal-Beck, S. ; Aclander, Jaime L.S. ; Altman, A. ; et al.
Phys.Rev.Lett. 68 (1992) 3012-3015, 1992.
Inspire Record 339565 DOI 10.17182/hepdata.19868

We present the first polarization measurements for pion absorption on a nucleus heavier than the deuteron. The polarization of protons resulting from π+ absorption in the He3 was measured at bombarding energies of 120 and 250 MeV. Protons from absorption in a quasideuteron were selected by applying kinematical constraints. A significant discrepancy was observed between the experimental results and theoretical predictions. At 120 MeV the measured polarizations for He3 are consistent with those of the deuteron. At 250 MeV the angular distribution of the polarization is significantly different than for the deuteron, showing sensitivity to the nuclear density, and thus may be sensitive to short range correlations between nucleons.

4 data tables

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Spin transfer measurements of the pi d (polarized) ---> p p (polarized) reaction spanning the Delta resonance

Feltham, A. ; Trelle, R.P. ; Jones, G. ; et al.
Phys.Rev.Lett. 66 (1991) 2573-2576, 1991.
Inspire Record 315151 DOI 10.17182/hepdata.19906

The first spin-transfer observables for the πd→pp reaction have been measured at a number of energies spanning the Δ resonance in this system. These parameters correspond to KSL and KSS of the pp→dπ reaction for incident proton energies ranging from 600 to 800 MeV. Such data can provide an important constraint on the determination of the partial-wave amplitudes describing this fundamental reaction. The discrepancies between our data, theoretical predictions, and values calculated from published partial-wave amplitudes demonstrate the need for further work in this area.

2 data tables

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Total and differential cross-sections for pi+ + d ---> p + p below 21-MeV

Ritchie, B.G. ; Minehart, R.C. ; Averett, T.D. ; et al.
Phys.Rev.Lett. 66 (1991) 568-571, 1991.
Inspire Record 316997 DOI 10.17182/hepdata.19907

Absolute total and differential cross sections for the reaction π++d→p+p have been measured for pion energies from 3.7 to 20.5 MeV. Evidence for p-wave strength was observed for all energies. Using detailed balance and corrections for Coulomb effects, the measured differential and total cross sections were found to be consistent with recent measurements for the reaction n+p→d+π0, offering no evidence for charge-independence breaking. The measured total cross sections for energies below 30 MeV are in disagreement with predictions by Blankleider and by Vogelzang, Bakker, and Boersma.

1 data table

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MEASUREMENT OF THE DIFFERENTIAL CROSS-SECTIONS FOR THE PI+ D ---> P P REACTION AT PION ENERGIES OF 280-MEV, 300-MEV, 330-MEV, 357-MEV, 390-MEV, 420-MEV AND 450-MEV

Borkovsky, M.Ya. ; Gaditsky, V.G. ; Gavrilov, G.E. ; et al.
J.Phys.G 11 (1985) 69-83, 1985.
Inspire Record 215606 DOI 10.17182/hepdata.38587

Differential cross sections for the process pi +d to pp at seven energies in the region Tpi =280-450 MeV and in the angular range theta * approximately=4-90 degrees have been measured on the LNPI synchrocyclotron. The results include 94 new data points. The measurements have been carried out using a ten-channel hodoscope set-up. Statistical errors are between 2.5% and 7.8% depending on the scattering angle and Tpi . The data obtained indicate that there is an essential contribution from the partial wave with orbital angular momentum l=3 over the whole energy range considered. The authors also observe a noticeable contribution from the l=4 partial wave to the differential cross sections of the pi +d to pp reaction from Tpi >or=357 MeV. The total cross sections for the process pi +d to pp are also presented.

9 data tables

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MEASUREMENT OF THE DIFFERENTIAL CROSS-SECTION FOR THE REACTION PI+ D ---> P P AT MOMENTA BETWEEN 0.48-GEV/C AND 1.16-GEV/C

Akemoto, M. ; Baba, K. ; Endo, I. ; et al.
Phys.Lett.B 149 (1984) 321-324, 1984.
Inspire Record 210255 DOI 10.17182/hepdata.30477

The differential cross section for the reaction π + + d → p + p has been measured at pion momenta between 0.48 and 1.16 GeV c with steps of 20 and 40 GeV c for seven CM proton angles between 6° and 61°. At smaller angles, the measured cross sections show a dip at around 0.7 GeV c , while at larger angles the cross sections vary monotonically as a function of incident momentum. The angular distribution shows a considerably rapid variation with increasing momentum. Legendre polynomial fits of the data are presented.

2 data tables

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LEGENDRE POLYNOMIAL COEFFICIENTS. NOTE THE FORM OF THE LEGENDRE EXPANSION DIFFERS BY A FACTOR P**-2 FROM THE CONVENTIONAL ONE.