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Cross Section for $\gamma n \to \pi^0 n$ measured at Mainz/A2

The A2 collaboration Briscoe, W.J. ; Hadžimehmedović, M. ; Kudryavtsev, A.E. ; et al.

Phys.Rev.C 100 (2019) 065205, 2019.

Inspire Record 1748263 DOI 10.17182/hepdata.116236

The $\gamma n \to \pi^0 n$ differential cross section evaluated for 27 energy bins span the photon-energy range 290-813 MeV (W = 1.195-1.553 GeV) and the pion c.m. polar production angles, ranging from 18 deg to 162 deg, making use of model-dependent nuclear corrections to extract pi0 production data on the neutron from measurements on the deuteron target. Additionally, the total photoabsorption cross section was measured. The tagged photon beam produced by the 883-MeV electron beam of the Mainz Microtron MAMI was used for the 0-meson production. Our accumulation of 3.6 x 10^6 $\gamma n \to \pi^0 n$ events allowed a detailed study of the reaction dynamics. Our data are in reasonable agreement with previous A2 measurements and extend them to lower energies. The data are compared to predictions of previous SAID, MAID, and BnGa partial-wave analyses and to the latest SAID fit MA19 that included our data. Selected photon decay amplitudes $N^* \to \gamma n$ at the resonance poles are determined for the first time.

21 data tables

Table 1

Excitation function at pion c.m. angle THETA=18 deg as function of incident photon energy E. The uncertainties are statistical and systematic, combined in quadrature.

Table 2

Excitation function at pion c.m. angle THETA=32 deg as function of incident photon energy E. The uncertainties are statistical and systematic, combined in quadrature.

Table 3

Excitation function at pion c.m. angle THETA=41 deg as function of incident photon energy E. The uncertainties are statistical and systematic, combined in quadrature.

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The photoproduction of $\pi^{0}$ mesons in hydrogen

Miller, D.B. ; Bellamy, E.H. ;

Proc.Phys.Soc. 81 (1963) 343-348, 1963.

Inspire Record 1393356 DOI 10.17182/hepdata.26953

None

1 data table

Table 1

No description provided.

On the measurement of $\pi^{+}$ meson photoproduction from hydrogen near threshold

Lewis, G.M. ; Azuma, R.E. ;

Proc.Phys.Soc. 73 (1959) 873-880, 1959.

Inspire Record 1393355 DOI 10.17182/hepdata.26968

None

1 data table

Table 1

No description provided.

A measurement of the longitudinal and transverse parts of the $\pi^{+}$ electroproduction cross-section at 1175 MeV pion-nucleon centre-of-mass energy.

Bardin, G. ; Duclos, J. ; Julien, J. ; et al.

Lett.Nuovo Cim. 13 (1975) 485-488, 1975.

Inspire Record 1393354 DOI 10.17182/hepdata.37444

None

1 data table

Table 1

DEDUCED FROM MEASUREMENTS AT EPSILON OF 0.20 AND 0.65.

Productions of $\pi^{+}$ photomesons at angles of 25-36° in the 152-162 MeV interval

Adamovich, M.I. ; Gorzhevskaya, É.G. ; Yagudina, F.R. ;

Sov.Phys.JETP 16 (1963) 786-788, 1963.

Inspire Record 1393124 DOI 10.17182/hepdata.39797

None

1 data table

Table 1

No description provided.

Asymmetry of the cross section of the reaction $\gamma$P $\rightarrow$ P$\pi^{0}$ in the energy interval 0.9-1.65 GeV at $\theta _{\pi}^{0 cms}$ = 110°

Abramyan, L.O. ; Avakyan, R.O. ; Akopov, N.Z. ; et al.

JETP Lett. 23 (1976) 375-378, 1976.

Inspire Record 1393126 DOI 10.17182/hepdata.39803

None

2 data tables

Table 1

THE ERRORS INCLUDE THE 10 PCT ERROR IN THE EFFECTIVE PHOTON POLARIZATION.

Table 2

No description provided.

Photoproduction of positive pions in hydrogen near threshold

Gorzhevskaya, É.G. ; Popova, V.M. ; Yagudina, F.R. ;

Sov.Phys.JETP 11 (1960) 200-201, 1960.

Inspire Record 1392963 DOI 10.17182/hepdata.39802

None

1 data table

Table 1

No description provided.

Photoproduction of charged pions near threshold

Adamovich, M.I. ; Gorzhevskaya, É.G. ; Larionova, V.G. ; et al.

Sov.Phys.JETP 11 (1960) 779-782, 1960.

Inspire Record 1392962 DOI 10.17182/hepdata.71292

None

12 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Coincidence electroproduction of single neutral pions in the resonance region at q 2 = 0.5 (GeV/ c ) 2

Latham, A. ; Allison, J. ; Booth, I. ; et al.

Nucl.Phys.B 156 (1979) 58-92, 1979.

Inspire Record 1392686 DOI 10.17182/hepdata.836

Data are presented for the reaction ep → ep π 0 at a nominal four-momentum transfer squared of 0.5 (GeV/ c ) 2 . The data were obtained using an extracted electron beam from NINA and two magnetic spectrometers for coincidence detection of the electron and proton. Details are given of the experimental method and the results are given for isobar masses in the range 1.19 – 1.73 GeV/ c 2 .

21 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.