Cross-section measurements of p + d → 3He + π0 and p + d → 3H + π+ at intermediate energies

doi:10.1016/0375-9474(85)90109-5

Nuclear Physics A

Volume 444, Issue 4, 11 November 1985, Pages 621-636

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Abstract

We present differential cross sections for $p + d →^{3} He + π^{0}$ at T_p = 300, 350, 400, 425, 450, 470 and 500 MeV, and for $p + d →^{3} H + π^{+}$ at 500 MeV, mostly near θ_π (c.m.) = 48° and 98°. The ratio $d σ(pd →^{3} H π^{+})/ d σ(pd →^{3} He π^{0}$ ) for identical four momentum transfer at 500 MeV is found to be 2.21 ± 0.17 to 2.57 ± 0.34, depending on angle. The dependence of the invariant matrix element squared |M|² on the relativistic invariants t and s is examined; for a given value of t, |M|² is almost independent of s for T_p between 350 and 800 MeV.

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Study of the 3He-η system in d- p collisions
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We have measured excitation functions for the dp → ³HeX, ( $X = π^{0}, η$ ) channels near the η production threshold. The data were taken during a slow ramping of the COSY internal deuteron beam scattered on a proton target. The excitation function for the reaction dp → ³He π⁰ does not show any structure which could originate from the decay of ³He–η bound state. We measured also the threshold excitation curve for the dp → ³HeX process, however, contrary to the SATURNE results, we observe no cusp near the η threshold.
Simultaneous measurements of the p+d→(A=3)+π reactions
2001, Nuclear Physics A
A stack of annular detectors made of high-purity germanium was used to measure simultaneously pd $→$ ³H $π^{+}$ and pd $→$ ³He $π^{0}$ differential cross sections at beam momenta of 750 MeV $/c$ , 800 MeV $/c$ , and 850 MeV $/c$ over a large angular range. The extracted total cross sections for the pd $→$ ³He $π^{0}$ reactions bridge a gap between near threshold data and those in the resonance region. The ratio of the cross sections for the two reaction channels taken at the same $η=p^{cm}_{π} /m_{π}$ yields $2.11±0.08$ indicating that a deviation from isospin symmetry is very small.
Charge and isospin symmetry breaking via external π0 - η meson mixing
2000, Nuclear Physics A
A simple model of isospin and charge symmetry breaking due to external π⁰–η meson mixing is presented. It is based on amplitudes extracted from the available experimental data for pd→³He $π^{0}$ , pd→³He $η$ and dd→⁴He $η$ reactions. Predictions of the strength of isospin symmetry breaking in pd→³H $π^{+} /^{3}$ He $π^{0}$ reactions are given. Within the same model, the cross section for the charge symmetry breaking dd→⁴He $π^{0}$ reaction is calculated.
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Differential cross section and analyzing powers for the pd → 3Heπ0 reaction in the Δ-resonance region
1987, Nuclear Physics, Section A
Angular distributions of the analyzing powers and differential cross sections for the reaction $pd →^{3} He π^{0}$ are reported at E_p=350, 450 and 500 MeV. The measured cross sections are generally in good agreement with previous measurements of this and other isospin related reactions. The data are compared to the results of various theoretical models none of which give fully satisfactory agreement with the cross section data while the only calculation of analyzing powers is in poor accord with the experimental results.
Production of light mesons in P + D reactions
1990, Nuclear Physics, Section A
Recent progress in our understanding of $pd →^{3} He π^{0} up to 2.5 GeV$ is reviewed. The main contributions are known but the calculations do not reproduce details of the observables even in the Δ peak. The experimental data on neutral meson production at threshold up to the Φ(1020) is discussed. The measured high counting rate of η's provides a nice opportunity to study rare and forbidden η decays by the easy ³He tagging.

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^†: Present address.

^∗: Present address: Department of Physics, George Washington University, Washington, DC 20052, USA.

^∗∗: Present address: MS H838, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

^††: Permanent address: Department of Physics, Rutgers University, Piscataway, NJ 08854, USA.

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Nuclear Physics A

Abstract

References (28)

Phys. Rev.

Nucl. Phys.

Phys. Rev. Lett.

Nucl. Phys.

l'Université de Paris-Sud, Commissariat à l'Energie Atomique, Saclay, report no. CEA-N-2320

thèse

Comissariat à l'Energie Atomique

Saclay, report no. CEA N-1248

Cited by (12)

Study of the <sup>3</sup>He-η system in d- p collisions

Simultaneous measurements of the p+d→(A=3)+π reactions

Charge and isospin symmetry breaking via external π<sup>0</sup> - η meson mixing

Test of charge independence in p + d → (A=3)+Pion reactions

Differential cross section and analyzing powers for the pd → <sup>3</sup>Heπ<sup>0</sup> reaction in the Δ-resonance region

Production of light mesons in P + D reactions