Total cross section measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi><mml:mi>n</mml:mi><mml:mo>→</mml:mo><mml:mi>p</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mi>−</mml:mi></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>reaction

Zabrodin, A.; Dolbilkin, B.S.; Audit, G.; d’Hose, N.; Murphy, L. Y.; Tamas, G.; Braghieri, A.; Pedroni, P.; Pinelli, T.; Beck, R.; Isbert, V.; Wartenberg, S.A.; Hall, S.J.

doi:10.1103/physrevc.55.r1617

Cited by 45 publications

(38 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two remarks must be made. The unpolarized double pion data off the nucleon measured with DAPHNE at MAMI [27,28] was recently revised [32]. The data shown for the n(γ, π 0 π − )p reaction are the result of this re-analysis [29].…”

Section: Resultsmentioning

confidence: 99%

“…The FSI can be minimized by the use of low incident photon energies, giving rise to low-energy pions which have much larger mean free paths than pions that can excite the ∆-resonance [9]. Photoproduction of the different charge states of pions from the free proton and the quasifree neutron has been previously studied in detail with the DAPHNE [27,28,30,31,32] and TAPS detectors [33,34,35,36,37,38] at MAMI in Mainz from threshold to the second resonance region and for the π 0 π 0 channel also at higher incident photon energies at GRAAL in Grenoble [39] (see [40] for an overview).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Double pion photoproduction off 40Ca

et al. 2007

Self Cite

View full text Add to dashboard Cite

Abstract. The photoproduction of π 0 π 0 and π 0 π ± pairs off 40 Ca has been investigated with the TAPS detector using the Glasgow photon tagging spectrometer at the Mainz MAMI accelerator. Data have been taken for incident photon energies in the energy range from 200 -820 MeV. Total cross sections have been extracted from threshold up to the maximum photon energy and invariant mass distributions of the pion pairs have been obtained for incident photon energies between 400 -500 MeV and 500 -550 MeV. The double π 0 invariant mass distributions show some relative enhancement with respect to the mixed charge channel at small invariant masses. The effects are smaller than previously observed for lead nuclei and the distributions do not significantly deviate from carbon data. The data are in good agreement with the results of recent calculations in the framework of the BUU model, with careful treatment of final state interaction effects but without an explicit in-medium modification of scalar, iso-scalar pion pairs. This means that for Ca most of the experimentally observed effect can be explained by final state interactions. Only at low incident photon energies there is still a small low mass enhancement of the double π 0 data over the BUU results.PACS. 13.60.Le meson production -25.20.Lj photoproduction reactions

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Double pion photoproduction off 40Ca

et al. 2007

Self Cite

View full text Add to dashboard Cite

show abstract

“…2). Photoproduction of pion pairs at low incident photon energies off the free proton and the quasifree neutron has been previously studied with the DAPHNE [44][45][46][47][48] …”

Section: Scalar Mesons: the σ-Mesonmentioning

confidence: 99%

In-Medium Properties of Hadrons

Krusche

2007

Int. J. Mod. Phys. A

View full text Add to dashboard Cite

A diverse experimental program for the study of the photoproduction of mesons off nuclei has been carried out -and is still running -at the Mainz MAMI and Bonn ELSA electron accelerators with the TAPS, Crystal Barrel, and Crystal Ball calorimeters. It is motivated as a detailed study of the in-medium properties of hadrons and the meson -nucleus interactions. Typical examples for the in-medium behavior of vector mesons (ω), scalar mesons (σ), and nucleon resonances (P 33 (1232), S 11 (1535), D 15 (1520)) are discussed. Special attention is paid to meson -nucleus final state interactions.

show abstract

“…The photoproduction of two pions on nucleons at low and intermediate energies (up to E γ ∼ 1 GeV) has been the subject of intense experimental [1][2][3][4][5][6] and theoretical [7][8][9][10][11][12][13][14][15][16][17][18][19] study. The works have been mainly motivated to understand the role of the many baryonic resonances involved in the process.…”

Section: Introductionmentioning

confidence: 99%

Helicity asymmetries in double pion photoproduction on the proton

Roca¹

2005

Nuclear Physics A

View full text Add to dashboard Cite

Based on a prior model on double pion photoproduction on the proton, successfully tested in total cross sections and invariant mass distributions, we make a theoretical study of the angular dependence of helicity asymmetries from the interaction of circularly polarized photons with unpolarized protons. We show that this observable is sensitive to details of the internal mechanisms and, thus, represents a complementary test of the theoretical model.

show abstract

Total cross section measurement of theγn→pπ−π0reaction

Cited by 45 publications

References 13 publications

Double pion photoproduction off 40Ca

Double pion photoproduction off 40Ca

In-Medium Properties of Hadrons

Helicity asymmetries in double pion photoproduction on the proton

Contact Info

Product

Resources

About