Radiative capture and charge exchange of negative pions on protons at 26.4 and 39.3 MeV

Salomon, M.; Measday, D.F.; Poutissou, J. M.; Robertson, B.C.

doi:10.1016/0375-9474(84)90615-8

Cited by 45 publications

(35 citation statements)

References 26 publications

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“…The results are shown in Fig. 10 and compared to the GWU FA08 partial-wave analysis and to the previous data [7,8,12,14,19]. As expected from the differential cross sections, our results agree with PWA predictions for the momentum 178 MeV/c, and are higher then predictions for the other momenta.…”

Section: A Systematic Uncertaintiessupporting

confidence: 79%

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Differential cross sections of the charge-exchange reactionπ−p→π0nin the momentum range from103
Mekterović¹,
Supek²,
Abaev³
et al. 2009
Phys. Rev. C
6
0
6
0
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Differential cross sections of the charge-exchange reaction π − p → π 0 n in the momentum range from 103 to 178 MeV/c Measured values of the differential cross sections for pion-nucleon charge exchange, π − p → π 0 n, are presented for π − momenta of 103, 112, 120, 130, 139, 152, and 178 MeV/c. Complete angular distributions were obtained by using the Crystal Ball detector at the Alternating Gradient Synchrotron at Brookhaven National Laboratory. Statistical uncertainties of the differential cross sections vary from 3% to 6% in the backward angle region, and from 6% to about 20% in the forward region with the exception of the two most forward angles. The systematic uncertainties are estimated to be about 3% for all momenta. I. INTRODUCTIONThere are three experimentally accessible scattering channels in the πN system: π + p → π + p and π − p → π − p elastic scattering, and the π − p → π 0 n charge-exchange reaction (CEX). Precise data for all three channels are needed to obtain an accurate description of the πN system via a consistent and complete set of scattering amplitudes. In that regard, the least satisfying situation is in the region below 100 MeV π − kinetic energy where the experimental database for CEX is quite limited. On the other hand, the low-energy region is very interesting because isospin symmetry-breaking effects may be visible there. Furthermore, low-energy data have a strong impact on extrapolations of scattering amplitudes to the nonphysical region, and this extrapolation is needed to obtain important physical quantities such as the πN σ term.Isospin symmetry is one of the key concepts in hadronic physics. Thus, it is very important to measure precisely small symmetry-breaking effects coming from both the up-down quark mass difference and the electromagnetic interaction. In the πN system, one such isospin-breaking effect is a departure from the so-called triangle relation

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Section: A Systematic Uncertaintiessupporting

confidence: 79%

“…The first CEX data below 100 MeV come from an experiment that used a single large NaI detector [7], [8]. The detector was placed at seven angles and collected continuous γ energy spectra that were unfolded into CEX angular distributions, for six energies between 27.4 and 91.7 MeV.…”

Section: Introductionmentioning

confidence: 99%

Differential cross sections of the charge-exchange reactionπ−p→π0nin the momentum range from103
Mekterović¹,
Supek²,
Abaev³
et al. 2009
Phys. Rev. C
6
0
6
0
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“…In order to join these results to those of Gilman in the resonance region we have used the parametrization of Blomquist and Laget [13]. Recent data [14] show that the neutron cross section is larger than the proton one by a sizeable amount in agreement with the threshold values and with the parametrization of Blomquist-Laget; the difference between proton and proton-neutron averaged contribution is illustrated in Fig.4. With this data we evaluate the electromagnetic average polarizability ~N= 15.5-10-4 fm.…”

Section: Znmentioning

confidence: 84%

Photonuclear reactions and dispersion relations

Rosa-Clot

Ericson

1985

Z Physik A

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We study the photonuclear reaction in the intermediate region. We evaluate the real part of the forward Compton amplitude through the dispersion relation and analyze its structure. The modification of the electromagnetic polarizability of the nucleon, ~, in the nuclear medium is calculated. We show that it affects appreciably the behaviour of the Compton amplitude in the intermediate region, consistent with the experimental data. In the same scheme the enhancement of the photonuclear sum rule, K, is interpreted as an exchange contribution to the nucleon Compton amplitude. We find in lead a value of K = 1.6 +0.2 and a quenching of about 20 % of ~.

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“…The response of TINA and MINA to a monoenergetic y ray can be fairly well described by the empirical function [45] P(E, A, B,C,D) …”

Section: Introductionmentioning

confidence: 99%

Total cross sections and analyzing powers for the reactionp+p→p+p+π0near threshold

et al. 1991

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We have studied the reaction p +p -+p+p+m from 320 to 500 MeV by detecting the y rays from m decay in coincidence in two large NaI crystals. The obtained differential and total cross sections of the pions are in agreement with previous measurements but are of a higher precision. We have also measured the pion analyzing powers; the first measurement of this observable. Our results are compared with those for the reactions np~N Nm. with confusing conclusions concerning the contribution of o. », the zero isospin pion production channel.

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Radiative capture and charge exchange of negative pions on protons at 26.4 and 39.3 MeV

Cited by 45 publications

References 26 publications

Differential cross sections of the charge-exchange reactionπ−p→π0nin the momentum range from103
Mekterović¹,
Supek²,
Abaev³
et al. 2009
Phys. Rev. C
6
0
6
0
View full text Add to dashboard Cite

Differential cross sections of the charge-exchange reactionπ−p→π0nin the momentum range from103
Mekterović¹,
Supek²,
Abaev³
et al. 2009
Phys. Rev. C
6
0
6
0
View full text Add to dashboard Cite

Photonuclear reactions and dispersion relations

Total cross sections and analyzing powers for the reactionp+p→p+p+π0near threshold

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Radiative capture and charge exchange of negative pions on protons at 26.4 and 39.3 MeV

Cited by 45 publications

References 26 publications

Differential cross sections of the charge-exchange reactionπ−p→π0nin the momentum range from103Mekterović1, Supek2, Abaev3 et al. 2009Phys. Rev. C6060View full textAdd to dashboardCite

Differential cross sections of the charge-exchange reactionπ−p→π0nin the momentum range from103Mekterović1, Supek2, Abaev3 et al. 2009Phys. Rev. C6060View full textAdd to dashboardCite

Photonuclear reactions and dispersion relations

Total cross sections and analyzing powers for the reactionp+p→p+p+π0near threshold

Contact Info

Product

Resources

About

Differential cross sections of the charge-exchange reactionπ−p→π0nin the momentum range from103
Mekterović¹,
Supek²,
Abaev³
et al. 2009
Phys. Rev. C
6
0
6
0
View full text Add to dashboard Cite

Differential cross sections of the charge-exchange reactionπ−p→π0nin the momentum range from103
Mekterović¹,
Supek²,
Abaev³
et al. 2009
Phys. Rev. C
6
0
6
0
View full text Add to dashboard Cite