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Open Access

Measurement of polarization observables $\textbf{T}$ , ${\textbf{P}}$ , and ${\textbf{H}}$ in $\mathbf {\pi ^0}$ and $\mathbf {\eta }$ photoproduction off quasi-free nucleons

The target asymmetry T, recoil asymmetry P, and beam-target double polarization observable H were determined in exclusive $\pi ^0$ ...

N. Jermann, B. Krusche, V. Metag, F. Afzal, M. Badea… in The European Physical Journal A (2023)

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Article

Measurement of the helicity dependence for single $\pi ^{0}$ photoproduction from the deuteron

The helicity-dependent single $\pi ^{0}$ π 0 ...

F. Cividini, M. Dieterle, S. Abt, P. Achenbach… in The European Physical Journal A (2022)
Article

Open Access

Single $\pi ^0$ production off neutrons bound in deuteron with linearly polarized photons

The quasifree $\overrightarrow{\gamma } d\rightarrow \pi ^0n(p)$ ...

C. Mullen, S. Gardner, D. I. Glazier, S. J. D. Kay… in The European Physical Journal A (2021)

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Article

Open Access

Experimental study of the $ \gamma p \rightarrow K^{0}\Sigma^{+}$, $ \gamma n \rightarrow K^{0} \Lambda$, and $ \gamma n \rightarrow K^{0} \Sigma^{0}$ reactions at the Mainz Microtron

This work measured $ \mathrm{d}\sigma/\mathrm{d}\Omega$dσ/dΩ for neutral kaon photoproduction reactions from threshold up to a c.m. energy of 1855MeV, focussing specifically on the $ \gamma p\rightarrow K^0\Sigma...

C. S. Akondi, K. Bantawa, D. M. Manley, S. Abt… in The European Physical Journal A (2019)

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Article

Determination of the scalar polarizabilities of the proton using beam asymmetry $\Sigma_{3}$ in Compton scattering

The scalar dipole polarizabilities, $\alpha_{E1}$ ...

V. Sokhoyan, E. J. Downie, E. Mornacchi, J. A. McGovern… in The European Physical Journal A (2017)
Article

Open Access

Photon asymmetry measurements of $\overrightarrow{\gamma}p \rightarrow \pi^{0} p$ for $E_{\gamma}=$ 320-650 MeV

High-statistics measurements of the photon asymmetry $\Sigma$ Σ ...

S. Gardner, D. Howdle, M. H. Sikora, Y. Wunderlich… in The European Physical Journal A (2016)

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Article

Photoproduction of $\eta$ $\pi$ pairs off nucleons and deuterons

Quasi-free photoproduction of $\pi\eta$ -pairs has been investigated from threshold up to incident photon energies of ...

A. Käser, F. Müller, J. Ahrens, J. R. M. Annand… in The European Physical Journal A (2016)
Article

Open Access

Photoproduction of $ \pi^{0}$ -pairs off protons and off neutrons

Total cross sections, angular distributions, and invariant-mass distributions have been measured for the photoproduction of $ \pi^{0}\...

M. Dieterle, M. Oberle, J. Ahrens, J. R. M. Annand… in The European Physical Journal A (2015)

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Article

Helicity dependence of the γ ³He → πX reactions in the Δ(1232) resonance region

The helicity dependences of the differential cross sections for the semi-inclusive γ ³He → π⁰ X and γ ³He → π^± X reactions have been measured for th...

S. Costanza, A. Mushkarenkov, F. Rigamonti, M. Romaniuk… in The European Physical Journal A (2014)
Article

Determination of the $ \eta$ mass with the Crystal Ball at MAMI-B

A new precise determination of the $ \eta$ meson mass is presented. It is based on a measurement of the threshold for...

A. Nikolaev, P. Aguar-Bartolomé, J. Ahrens… in The European Physical Journal A (2014)
Article

Open Access

Measurement of the beam-helicity asymmetry I^⊙ in the photoproduction of $ \pi^{0}$ $ \pi^{\pm}$ pairs off protons and off neutrons

Beam-helicity asymmetries have been measured at the MAMI accelerator in Mainz for the photoproduction of mixed-charge pion pairs in the reactions ...

M. Oberle, J. Ahrens, J. R. M. Annand, H. J. Arends… in The European Physical Journal A (2014)

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Article

Open Access

Quasi-free photoproduction of η-mesons off ³He nuclei

Quasi-free photoproduction of η-mesons has been measured off nucleons bound in ³He nuclei for incident photon energies from the threshold region up to 1.4 GeV. The experiment was performed at the tagged photon fa...

L. Witthauer, D. Werthmüller, I. Keshelashvili… in The European Physical Journal A (2013)

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Article

In-medium modifications of the ω meson near the production threshold

The in-medium properties of the ω meson were investigated at the MAMI-C electron accelerator using the Crystal Ball/TAPS detector system to identify ω mesons through their ω → π ⁰ ...

M. Thiel, V. Metag, P. Aguar Bartolome, L. K. Akasoy… in The European Physical Journal A (2013)
Article

Open Access

Measurements of ¹²C $(\vec{\gamma},pp)$ photon asymmetries for $E_{\gamma}=200$ –450 MeV

The ¹²C $(\vec{\gamma},pp)$ reaction has been studied in the photon energy range 200-450 MeV at the Mainz microtron MA...

J. Robinson, I. J. D. MacGregor, J. R. M. Annand… in The European Physical Journal A (2013)

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Article

Coherent photoproduction of π⁰- and η-mesons off ⁷Li

Coherent photoproduction of π⁰-mesons from threshold (E _th ≈ 136 MeV) throughout the Δ-resonance region and of η-mesons close to the production threshold (E ...

Y. Maghrbi, B. Krusche, J. Ahrens, J. R. M. Annand… in The European Physical Journal A (2013)
Article

Photoproduction of π⁰π⁰ - and π⁰π⁺ -pairs off the proton from threshold to the second resonance region

Precise total cross-sections and invariant-mass distributions have been measured for photoproduction of pion pairs off the proton producing ...

F. Zehr, B. Krusche, P. Aguar, J. Ahrens… in The European Physical Journal A (2012)
Article

Measurement of the helicity-dependent total cross-section for the $ \gamma$ n $ \rightarrow$ p $ \pi^{-}_{}$ $ \pi^{0}_{}$ reaction

The helicity dependence of the total cross-section for the $ \gamma$ n $ \rightarrow$ ...

J. Ahrens, S. Altieri, J. R. M. Annand, H. -J. Arends… in The European Physical Journal A (2011)
Article

Helicity dependence of the $ \gamma$ d $ \rightarrow$ $ \pi$ NN reactions in the $ \Delta$ -resonance region

The helicity dependence of the differential cross-section for the $ \gamma$ d ...

J. Ahrens, S. Altieri, J. R. M. Annand, H. -J. Arends… in The European Physical Journal A (2010)
Article

Radiative π⁰ photoproduction on protons in the Δ⁺ (1232) region

The reaction γp → pπ ⁰γ′ has been measured with the Crystal Ball/TAPS detectors using the energy-tagged photon beam at the electron accelerator facility MAMI-B. Energy and angular differen...

S. Schumann, B. Boillat, E. J. Downie… in The European Physical Journal A (2010)
Article

Photoproduction of $ \pi^{0}_{}$ $ \eta$ on protons and the $ \Delta$ (1700)D₃₃ -resonance

Total and differential cross-sections for the reaction $\ensuremath \gamma p\rightarrow\pi^0\eta p$ have been measure...

V. L. Kashevarov, A. Fix, P. Aguar-Bartolomé… in The European Physical Journal A (2009)

31 Result(s)

Measurement of polarization observables \(\textbf{T}\) , \({\textbf{P}}\) , and \({\textbf{H}}\) in \(\mathbf {\pi ^0}\) and \(\mathbf {\eta }\) photoproduction off quasi-free nucleons

Measurement of the helicity dependence for single \(\pi ^{0}\) photoproduction from the deuteron

Single \(\pi ^0\) production off neutrons bound in deuteron with linearly polarized photons

Experimental study of the \( \gamma p \rightarrow K^{0}\Sigma^{+}\), \( \gamma n \rightarrow K^{0} \Lambda\), and \( \gamma n \rightarrow K^{0} \Sigma^{0}\) reactions at the Mainz Microtron

Determination of the scalar polarizabilities of the proton using beam asymmetry \(\Sigma_{3}\) in Compton scattering

Photon asymmetry measurements of \(\overrightarrow{\gamma}p \rightarrow \pi^{0} p\) for \(E_{\gamma}=\) 320-650 MeV

Photoproduction of \(\eta\) \(\pi\) pairs off nucleons and deuterons

Photoproduction of \( \pi^{0}\) -pairs off protons and off neutrons

Helicity dependence of the γ ³He → πX reactions in the Δ(1232) resonance region

Determination of the \( \eta\) mass with the Crystal Ball at MAMI-B

Measurement of the beam-helicity asymmetry I^⊙ in the photoproduction of \( \pi^{0}\) \( \pi^{\pm}\) pairs off protons and off neutrons

Quasi-free photoproduction of η-mesons off ³He nuclei

In-medium modifications of the ω meson near the production threshold

Measurements of ¹²C \((\vec{\gamma},pp)\) photon asymmetries for \(E_{\gamma}=200\) –450 MeV

Coherent photoproduction of π⁰- and η-mesons off ⁷Li

Photoproduction of π⁰π⁰ - and π⁰π⁺ -pairs off the proton from threshold to the second resonance region

Measurement of the helicity-dependent total cross-section for the \( \gamma\) n \( \rightarrow\) p \( \pi^{-}_{}\) \( \pi^{0}_{}\) reaction

Helicity dependence of the \( \gamma\) d \( \rightarrow\) \( \pi\) NN reactions in the \( \Delta\) -resonance region

Radiative π⁰ photoproduction on protons in the Δ⁺ (1232) region

Photoproduction of \( \pi^{0}_{}\) \( \eta\) on protons and the \( \Delta\) (1700)D₃₃ -resonance

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