cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17182/hepdata.132014.v1/t119
title: "Eprot_39" of "Measurement of the helicity dependence for single $\pi^{0}$ photoproduction from the deuteron"

description: Helicity asymmetry E for quasi-free proton at W=1915. MeV
description: A2 Collaboration at MAMI.
The helicity-dependent single $\pi^0$ photoproduction cross section
on the deuteron and the angular dependence of the double
polarisation observable E for the quasi-free single $\pi^0$
production off the proton and the neutron have been measured,
for the first time, from the threshold region up to the photon
energy 1.4 GeV. The experiment was performed at the tagged
photon facility of the MAMI accelerator and used a circularly
polarised photon beam and longitudinally polarised deuteron target.
The reaction products were detected using the large acceptance
Crystal Ball/TAPS calorimeter, which covered 97% of the full solid
angle. Comparing the cross section from the deuteron with the sum
of free nucleon cross sections provides a quantitative estimate of
the effects of the nuclear medium on pion production. In contrast,
comparison of the E helicity asymmetry data from quasi-free
protons off deuterium with data from a free proton target
indicates that nuclear effects do not significantly affect this
observable. As a consequence, it is deduced that the helicity
asymmetry E on a free neutron can be reliably extracted from
measurements on a deuteron in quasi-free kinematics.
Main sources of systematic uncertainties come from the target
polarisation (10%) and from the unpolarised background
subtraction (from 2% up to 10%).
DOI: 10.17182/hepdata.132014.v1/t120
title: "Eneut_01" of "Measurement of the helicity dependence for single $\pi^{0}$ photoproduction from the deuteron"

description: Helicity asymmetry E for quasi-free neutron at W=1165. MeV
description: A2 Collaboration at MAMI.
The helicity-dependent single $\pi^0$ photoproduction cross section
on the deuteron and the angular dependence of the double
polarisation observable E for the quasi-free single $\pi^0$
production off the proton and the neutron have been measured,
for the first time, from the threshold region up to the photon
energy 1.4 GeV. The experiment was performed at the tagged
photon facility of the MAMI accelerator and used a circularly
polarised photon beam and longitudinally polarised deuteron target.
The reaction products were detected using the large acceptance
Crystal Ball/TAPS calorimeter, which covered 97% of the full solid
angle. Comparing the cross section from the deuteron with the sum
of free nucleon cross sections provides a quantitative estimate of
the effects of the nuclear medium on pion production. In contrast,
comparison of the E helicity asymmetry data from quasi-free
protons off deuterium with data from a free proton target
indicates that nuclear effects do not significantly affect this
observable. As a consequence, it is deduced that the helicity
asymmetry E on a free neutron can be reliably extracted from
measurements on a deuteron in quasi-free kinematics.
Main sources of systematic uncertainties come from the target
polarisation (10%) and from the unpolarised background
subtraction (from 2% up to 10%).
DOI: 10.17182/hepdata.132014.v1/t121
title: "Eneut_02" of "Measurement of the helicity dependence for single $\pi^{0}$ photoproduction from the deuteron"

description: Helicity asymmetry E for quasi-free neutron at W=1195. MeV
description: A2 Collaboration at MAMI.
The helicity-dependent single $\pi^0$ photoproduction cross section
on the deuteron and the angular dependence of the double
polarisation observable E for the quasi-free single $\pi^0$
production off the proton and the neutron have been measured,
for the first time, from the threshold region up to the photon
energy 1.4 GeV. The experiment was performed at the tagged
photon facility of the MAMI accelerator and used a circularly
polarised photon beam and longitudinally polarised deuteron target.
The reaction products were detected using the large acceptance
Crystal Ball/TAPS calorimeter, which covered 97% of the full solid
angle. Comparing the cross section from the deuteron with the sum
of free nucleon cross sections provides a quantitative estimate of
the effects of the nuclear medium on pion production. In contrast,
comparison of the E helicity asymmetry data from quasi-free
protons off deuterium with data from a free proton target
indicates that nuclear effects do not significantly affect this
observable. As a consequence, it is deduced that the helicity
asymmetry E on a free neutron can be reliably extracted from
measurements on a deuteron in quasi-free kinematics.
Main sources of systematic uncertainties come from the target
polarisation (10%) and from the unpolarised background
subtraction (from 2% up to 10%).
DOI: 10.17182/hepdata.132014.v1/t122
title: "Eneut_03" of "Measurement of the helicity dependence for single $\pi^{0}$ photoproduction from the deuteron"

description: Helicity asymmetry E for quasi-free neutron at W=1225. MeV
description: A2 Collaboration at MAMI.
The helicity-dependent single $\pi^0$ photoproduction cross section
on the deuteron and the angular dependence of the double
polarisation observable E for the quasi-free single $\pi^0$
production off the proton and the neutron have been measured,
for the first time, from the threshold region up to the photon
energy 1.4 GeV. The experiment was performed at the tagged
photon facility of the MAMI accelerator and used a circularly
polarised photon beam and longitudinally polarised deuteron target.
The reaction products were detected using the large acceptance
Crystal Ball/TAPS calorimeter, which covered 97% of the full solid
angle. Comparing the cross section from the deuteron with the sum
of free nucleon cross sections provides a quantitative estimate of
the effects of the nuclear medium on pion production. In contrast,
comparison of the E helicity asymmetry data from quasi-free
protons off deuterium with data from a free proton target
indicates that nuclear effects do not significantly affect this
observable. As a consequence, it is deduced that the helicity
asymmetry E on a free neutron can be reliably extracted from
measurements on a deuteron in quasi-free kinematics.
Main sources of systematic uncertainties come from the target
polarisation (10%) and from the unpolarised background
subtraction (from 2% up to 10%).
DOI: 10.17182/hepdata.132014.v1/t123
title: "Eneut_04" of "Measurement of the helicity dependence for single $\pi^{0}$ photoproduction from the deuteron"

description: Helicity asymmetry E for quasi-free neutron at W=1255. MeV
description: A2 Collaboration at MAMI.
The helicity-dependent single $\pi^0$ photoproduction cross section
on the deuteron and the angular dependence of the double
polarisation observable E for the quasi-free single $\pi^0$
production off the proton and the neutron have been measured,
for the first time, from the threshold region up to the photon
energy 1.4 GeV. The experiment was performed at the tagged
photon facility of the MAMI accelerator and used a circularly
polarised photon beam and longitudinally polarised deuteron target.
The reaction products were detected using the large acceptance
Crystal Ball/TAPS calorimeter, which covered 97% of the full solid
angle. Comparing the cross section from the deuteron with the sum
of free nucleon cross sections provides a quantitative estimate of
the effects of the nuclear medium on pion production. In contrast,
comparison of the E helicity asymmetry data from quasi-free
protons off deuterium with data from a free proton target
indicates that nuclear effects do not significantly affect this
observable. As a consequence, it is deduced that the helicity
asymmetry E on a free neutron can be reliably extracted from
measurements on a deuteron in quasi-free kinematics.
Main sources of systematic uncertainties come from the target
polarisation (10%) and from the unpolarised background
subtraction (from 2% up to 10%).
DOI: 10.17182/hepdata.132014.v1/t124
title: "Eneut_05" of "Measurement of the helicity dependence for single $\pi^{0}$ photoproduction from the deuteron"

description: Helicity asymmetry E for quasi-free neutron at W=1285. MeV
description: A2 Collaboration at MAMI.
The helicity-dependent single $\pi^0$ photoproduction cross section
on the deuteron and the angular dependence of the double
polarisation observable E for the quasi-free single $\pi^0$
production off the proton and the neutron have been measured,
for the first time, from the threshold region up to the photon
energy 1.4 GeV. The experiment was performed at the tagged
photon facility of the MAMI accelerator and used a circularly
polarised photon beam and longitudinally polarised deuteron target.
The reaction products were detected using the large acceptance
Crystal Ball/TAPS calorimeter, which covered 97% of the full solid
angle. Comparing the cross section from the deuteron with the sum
of free nucleon cross sections provides a quantitative estimate of
the effects of the nuclear medium on pion production. In contrast,
comparison of the E helicity asymmetry data from quasi-free
protons off deuterium with data from a free proton target
indicates that nuclear effects do not significantly affect this
observable. As a consequence, it is deduced that the helicity
asymmetry E on a free neutron can be reliably extracted from
measurements on a deuteron in quasi-free kinematics.
Main sources of systematic uncertainties come from the target
polarisation (10%) and from the unpolarised background
subtraction (from 2% up to 10%).
DOI: 10.17182/hepdata.132014.v1/t125
title: "Eneut_06" of "Measurement of the helicity dependence for single $\pi^{0}$ photoproduction from the deuteron"

description: Helicity asymmetry E for quasi-free neutron at W=1315. MeV
description: A2 Collaboration at MAMI.
The helicity-dependent single $\pi^0$ photoproduction cross section
on the deuteron and the angular dependence of the double
polarisation observable E for the quasi-free single $\pi^0$
production off the proton and the neutron have been measured,
for the first time, from the threshold region up to the photon
energy 1.4 GeV. The experiment was performed at the tagged
photon facility of the MAMI accelerator and used a circularly
polarised photon beam and longitudinally polarised deuteron target.
The reaction products were detected using the large acceptance
Crystal Ball/TAPS calorimeter, which covered 97% of the full solid
angle. Comparing the cross section from the deuteron with the sum
of free nucleon cross sections provides a quantitative estimate of
the effects of the nuclear medium on pion production. In contrast,
comparison of the E helicity asymmetry data from quasi-free
protons off deuterium with data from a free proton target
indicates that nuclear effects do not significantly affect this
observable. As a consequence, it is deduced that the helicity
asymmetry E on a free neutron can be reliably extracted from
measurements on a deuteron in quasi-free kinematics.
Main sources of systematic uncertainties come from the target
polarisation (10%) and from the unpolarised background
subtraction (from 2% up to 10%).
DOI: 10.17182/hepdata.132014.v1/t126
title: "Eneut_07" of "Measurement of the helicity dependence for single $\pi^{0}$ photoproduction from the deuteron"

description: Helicity asymmetry E for quasi-free neutron at W=1339. MeV
description: A2 Collaboration at MAMI.
The helicity-dependent single $\pi^0$ photoproduction cross section
on the deuteron and the angular dependence of the double
polarisation observable E for the quasi-free single $\pi^0$
production off the proton and the neutron have been measured,
for the first time, from the threshold region up to the photon
energy 1.4 GeV. The experiment was performed at the tagged
photon facility of the MAMI accelerator and used a circularly
polarised photon beam and longitudinally polarised deuteron target.
The reaction products were detected using the large acceptance
Crystal Ball/TAPS calorimeter, which covered 97% of the full solid
angle. Comparing the cross section from the deuteron with the sum
of free nucleon cross sections provides a quantitative estimate of
the effects of the nuclear medium on pion production. In contrast,
comparison of the E helicity asymmetry data from quasi-free
protons off deuterium with data from a free proton target
indicates that nuclear effects do not significantly affect this
observable. As a consequence, it is deduced that the helicity
asymmetry E on a free neutron can be reliably extracted from
measurements on a deuteron in quasi-free kinematics.
Main sources of systematic uncertainties come from the target
polarisation (10%) and from the unpolarised background
subtraction (from 2% up to 10%).
DOI: 10.17182/hepdata.132014.v1/t127
title: "Eneut_08" of "Measurement of the helicity dependence for single $\pi^{0}$ photoproduction from the deuteron"

description: Helicity asymmetry E for quasi-free neutron at W=1357. MeV
description: A2 Collaboration at MAMI.
The helicity-dependent single $\pi^0$ photoproduction cross section
on the deuteron and the angular dependence of the double
polarisation observable E for the quasi-free single $\pi^0$
production off the proton and the neutron have been measured,
for the first time, from the threshold region up to the photon
energy 1.4 GeV. The experiment was performed at the tagged
photon facility of the MAMI accelerator and used a circularly
polarised photon beam and longitudinally polarised deuteron target.
The reaction products were detected using the large acceptance
Crystal Ball/TAPS calorimeter, which covered 97% of the full solid
angle. Comparing the cross section from the deuteron with the sum
of free nucleon cross sections provides a quantitative estimate of
the effects of the nuclear medium on pion production. In contrast,
comparison of the E helicity asymmetry data from quasi-free
protons off deuterium with data from a free proton target
indicates that nuclear effects do not significantly affect this
observable. As a consequence, it is deduced that the helicity
asymmetry E on a free neutron can be reliably extracted from
measurements on a deuteron in quasi-free kinematics.
Main sources of systematic uncertainties come from the target
polarisation (10%) and from the unpolarised background
subtraction (from 2% up to 10%).
DOI: 10.17182/hepdata.132014.v1/t128
title: "Eneut_09" of "Measurement of the helicity dependence for single $\pi^{0}$ photoproduction from the deuteron"

description: Helicity asymmetry E for quasi-free neutron at W=1375. MeV
description: A2 Collaboration at MAMI.
The helicity-dependent single $\pi^0$ photoproduction cross section
on the deuteron and the angular dependence of the double
polarisation observable E for the quasi-free single $\pi^0$
production off the proton and the neutron have been measured,
for the first time, from the threshold region up to the photon
energy 1.4 GeV. The experiment was performed at the tagged
photon facility of the MAMI accelerator and used a circularly
polarised photon beam and longitudinally polarised deuteron target.
The reaction products were detected using the large acceptance
Crystal Ball/TAPS calorimeter, which covered 97% of the full solid
angle. Comparing the cross section from the deuteron with the sum
of free nucleon cross sections provides a quantitative estimate of
the effects of the nuclear medium on pion production. In contrast,
comparison of the E helicity asymmetry data from quasi-free
protons off deuterium with data from a free proton target
indicates that nuclear effects do not significantly affect this
observable. As a consequence, it is deduced that the helicity
asymmetry E on a free neutron can be reliably extracted from
measurements on a deuteron in quasi-free kinematics.
Main sources of systematic uncertainties come from the target
polarisation (10%) and from the unpolarised background
subtraction (from 2% up to 10%).
DOI: 10.17182/hepdata.132014.v1/t129
title: "Eneut_10" of "Measurement of the helicity dependence for single $\pi^{0}$ photoproduction from the deuteron"

description: Helicity asymmetry E for quasi-free neutron at W=1393. MeV
description: A2 Collaboration at MAMI.
The helicity-dependent single $\pi^0$ photoproduction cross section
on the deuteron and the angular dependence of the double
polarisation observable E for the quasi-free single $\pi^0$
production off the proton and the neutron have been measured,
for the first time, from the threshold region up to the photon
energy 1.4 GeV. The experiment was performed at the tagged
photon facility of the MAMI accelerator and used a circularly
polarised photon beam and longitudinally polarised deuteron target.
The reaction products were detected using the large acceptance
Crystal Ball/TAPS calorimeter, which covered 97% of the full solid
angle. Comparing the cross section from the deuteron with the sum
of free nucleon cross sections provides a quantitative estimate of
the effects of the nuclear medium on pion production. In contrast,
comparison of the E helicity asymmetry data from quasi-free
protons off deuterium with data from a free proton target
indicates that nuclear effects do not significantly affect this
observable. As a consequence, it is deduced that the helicity
asymmetry E on a free neutron can be reliably extracted from
measurements on a deuteron in quasi-free kinematics.
Main sources of systematic uncertainties come from the target
polarisation (10%) and from the unpolarised background
subtraction (from 2% up to 10%).
DOI: 10.17182/hepdata.132014.v1/t130
title: "Eneut_11" of "Measurement of the helicity dependence for single $\pi^{0}$ photoproduction from the deuteron"

description: Helicity asymmetry E for quasi-free neutron at W=1411. MeV
description: A2 Collaboration at MAMI.
The helicity-dependent single $\pi^0$ photoproduction cross section
on the deuteron and the angular dependence of the double
polarisation observable E for the quasi-free single $\pi^0$
production off the proton and the neutron have been measured,
for the first time, from the threshold region up to the photon
energy 1.4 GeV. The experiment was performed at the tagged
photon facility of the MAMI accelerator and used a circularly
polarised photon beam and longitudinally polarised deuteron target.
The reaction products were detected using the large acceptance
Crystal Ball/TAPS calorimeter, which covered 97% of the full solid
angle. Comparing the cross section from the deuteron with the sum
of free nucleon cross sections provides a quantitative estimate of
the effects of the nuclear medium on pion production. In contrast,
comparison of the E helicity asymmetry data from quasi-free
protons off deuterium with data from a free proton target
indicates that nuclear effects do not significantly affect this
observable. As a consequence, it is deduced that the helicity
asymmetry E on a free neutron can be reliably extracted from
measurements on a deuteron in quasi-free kinematics.
Main sources of systematic uncertainties come from the target
polarisation (10%) and from the unpolarised background
subtraction (from 2% up to 10%).
DOI: 10.17182/hepdata.132014.v1/t131
title: "Eneut_12" of "Measurement of the helicity dependence for single $\pi^{0}$ photoproduction from the deuteron"

description: Helicity asymmetry E for quasi-free neutron at W=1429. MeV
description: A2 Collaboration at MAMI.
The helicity-dependent single $\pi^0$ photoproduction cross section
on the deuteron and the angular dependence of the double
polarisation observable E for the quasi-free single $\pi^0$
production off the proton and the neutron have been measured,
for the first time, from the threshold region up to the photon
energy 1.4 GeV. The experiment was performed at the tagged
photon facility of the MAMI accelerator and used a circularly
polarised photon beam and longitudinally polarised deuteron target.
The reaction products were detected using the large acceptance
Crystal Ball/TAPS calorimeter, which covered 97% of the full solid
angle. Comparing the cross section from the deuteron with the sum
of free nucleon cross sections provides a quantitative estimate of
the effects of the nuclear medium on pion production. In contrast,
comparison of the E helicity asymmetry data from quasi-free
protons off deuterium with data from a free proton target
indicates that nuclear effects do not significantly affect this
observable. As a consequence, it is deduced that the helicity
asymmetry E on a free neutron can be reliably extracted from
measurements on a deuteron in quasi-free kinematics.
Main sources of systematic uncertainties come from the target
polarisation (10%) and from the unpolarised background
subtraction (from 2% up to 10%).
DOI: 10.17182/hepdata.132014.v1/t132
title: "Eneut_13" of "Measurement of the helicity dependence for single $\pi^{0}$ photoproduction from the deuteron"

description: Helicity asymmetry E for quasi-free neutron at W=1447. MeV
description: A2 Collaboration at MAMI.
The helicity-dependent single $\pi^0$ photoproduction cross section
on the deuteron and the angular dependence of the double
polarisation observable E for the quasi-free single $\pi^0$
production off the proton and the neutron have been measured,
for the first time, from the threshold region up to the photon
energy 1.4 GeV. The experiment was performed at the tagged
photon facility of the MAMI accelerator and used a circularly
polarised photon beam and longitudinally polarised deuteron target.
The reaction products were detected using the large acceptance
Crystal Ball/TAPS calorimeter, which covered 97% of the full solid
angle. Comparing the cross section from the deuteron with the sum
of free nucleon cross sections provides a quantitative estimate of
the effects of the nuclear medium on pion production. In contrast,
comparison of the E helicity asymmetry data from quasi-free
protons off deuterium with data from a free proton target
indicates that nuclear effects do not significantly affect this
observable. As a consequence, it is deduced that the helicity
asymmetry E on a free neutron can be reliably extracted from
measurements on a deuteron in quasi-free kinematics.
Main sources of systematic uncertainties come from the target
polarisation (10%) and from the unpolarised background
subtraction (from 2% up to 10%).
DOI: 10.17182/hepdata.132014.v1/t133
title: "Eneut_14" of "Measurement of the helicity dependence for single $\pi^{0}$ photoproduction from the deuteron"

description: Helicity asymmetry E for quasi-free neutron at W=1465. MeV
description: A2 Collaboration at MAMI.
The helicity-dependent single $\pi^0$ photoproduction cross section
on the deuteron and the angular dependence of the double
polarisation observable E for the quasi-free single $\pi^0$
production off the proton and the neutron have been measured,
for the first time, from the threshold region up to the photon
energy 1.4 GeV. The experiment was performed at the tagged
photon facility of the MAMI accelerator and used a circularly
polarised photon beam and longitudinally polarised deuteron target.
The reaction products were detected using the large acceptance
Crystal Ball/TAPS calorimeter, which covered 97% of the full solid
angle. Comparing the cross section from the deuteron with the sum
of free nucleon cross sections provides a quantitative estimate of
the effects of the nuclear medium on pion production. In contrast,
comparison of the E helicity asymmetry data from quasi-free
protons off deuterium with data from a free proton target
indicates that nuclear effects do not significantly affect this
observable. As a consequence, it is deduced that the helicity
asymmetry E on a free neutron can be reliably extracted from
measurements on a deuteron in quasi-free kinematics.
Main sources of systematic uncertainties come from the target
polarisation (10%) and from the unpolarised background
subtraction (from 2% up to 10%).