Spin correlations and analyzing powers in pp → π+d between 447 and 578 MeV

doi:10.1016/0375-9474(84)90307-5

Nuclear Physics A

Volume 415, Issue 3, 19 March 1984, Pages 365-390

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Abstract

The analyzing power A_n0(θ) and the spin correlation parameters A_nn(θ), A_ss(θ), A_kk(θ), A_sk(θ) have been measured in the reaction pp → π⁺d over a large angular range at 447, 496, 515, 538 and 578 MeV. The experiments were performed at SIN, using a polarized proton beam and a polarized proton target. The measured angular distributions have been fitted to phenomenological partial wave expansions in terms of Legendre polynomials and associated functions. Results have been compared with several calculations based on different theoretical models. At the lower energies, the agreement is reasonably good; however, none of the theories is able to explain all the results in a satisfactory way.

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First measurements of spin correlations in the n→p→→dπ0 reaction
2013, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
The transverse spin correlations $A_{x, x}$ and $A_{y, y}$ in the $\vec{n} \vec{p} \to d π^{0}$ reaction have been measured for the first time in quasi-free kinematics at the COSY-ANKE facility using a polarised deuteron beam incident on a polarised hydrogen cell target. The results obtained for neutron energies close to 353 MeV and 600 MeV are in good agreement with the partial wave analysis of data on the isospin-related $p p \to d π^{+}$ reaction, though the present results cover kinematic regions that are largely absent from existing data sets.
Energy dependence of the analyzing power for the pp → π+d reaction in the energy region 500-800 MeV
1992, Nuclear Physics, Section A
The energy dependence of the analyzing power A_y for the pp → π⁺d reaction was measured during polarized beam acceleration from 500 to 800 MeV, using an internal target inserted into the beam every acceleration cycle. The measurements were made with the pion laboratory angle fixed at 68° and with incident proton energy bins varying from 10 to 30 MeV in width. The statistical accuracy per bin is $ΔA_{y} ⋍ 0.06$ .
Spin transfer, K<inf>ss</inf> in the pp → dπ+ reaction
1989, Nuclear Physics, Section A
We have measured the vector polarization of deuterons at center-of-mass angles from 20° to 155° produced in the $p p → d π^{+}$ reaction by a 507 MeV beam of sideways-polarized protons. Our results for sideways-to-sideways polarization transfer confirm the partial-wave amplitude fit of Bugg et al. Various model calculations are in qualitative agreement with our results. Our results are consistent with the corrected sideways-to-sideways spin transfer results obtained at 515 MeV by the University of Geneva group.
Few body physics at SIN
1987, Nuclear Physics, Section A
Quark versus hadronic degrees of freedom in light nuclear system
1987, Nuclear Physics, Section A
We present a review of papers presented on the subject; $p$ -p interaction, N-N interaction at medium energies and the dibaryon resonances, the reaction pp→πd and πd elastic scattering in the framework of the NNπNN equations. Included also, are the contributions on photo- and electro-disintegration of the deuteron, pion absorption on ³He, π−N scattering, and the size of the nucleon in nuclei.
Measurement of the total cross section difference Δσ<inf>T</inf>(pp) in the energy range from 0.43 to 2.4 GeV
1986, Nuclear Physics, Section B
The SATURNE II polarized proton beam and the Saclay frozen spin polarized proton target were used to measure the total cross section difference Δσ_T = −2σ_{1 tot} at 26 energies between 0.43 and 2.4 GeV. Here Δσ_T is the total cross section difference for transverse beam and target spins parallel and antiparallel, respectively, and σ_1tot is one of spin-dependent terms in the total cross section σ_tot. The energy dependence of Δσ_T below 1 GeV shows similar structures as for Δσ_L. An additional minimum appears at about 1.3 GeV, which involves a structure in singlet spin partial waves.

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^∗: Present address: High Energy Physics Lab, Harvard University, Cambridge, Mass. 02138, USA.

^∗∗: Present address: Physics Dept. University of California at Irvine, Irvine, CA 92717, USA.

^∗∗∗: Present address: Rutherford Laboratory, Chilton, Didcot, Oxon, OX11 0QX, England.

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Nuclear Physics A

Abstract

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Pion production and absorption in Nuclei

Surveys in high energy physics

Pion production and absorption in Nuclei

Cited by (31)

First measurements of spin correlations in the n→p→→dπ<sup>0</sup> reaction

Energy dependence of the analyzing power for the pp → π<sup>+</sup>d reaction in the energy region 500-800 MeV

Spin transfer, K<inf>ss</inf> in the pp → dπ<sup>+</sup> reaction

Few body physics at SIN

Quark versus hadronic degrees of freedom in light nuclear system

Measurement of the total cross section difference Δσ<inf>T</inf>(pp) in the energy range from 0.43 to 2.4 GeV