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

The A2 collaboration
Eur.Phys.J.A 58 (2022) 113, 2022.

Abstract (data abstract)
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%).

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    Data from Fig.11a

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    Inclusive polarized total cross section as a function of photon beam energy.

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    Data from Figs.12 and 13 in publication

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    Helicity-dependent differential cross section on deuteron at Egamma= 161. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 178. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 196. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 213. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 230. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 247. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 264. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 281. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 299. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 316. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 333. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 351. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 368. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 386. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 403. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 421. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 438. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 456. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 473. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 491. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 508. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 526. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 543. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 561. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 578. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 596. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 613. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 631. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 648. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 666. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 683. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 700. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 718. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 735. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 752. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 769. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 786. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 803. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 820. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 837. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 853. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 870. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 887. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 903. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 919. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 936. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 952. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 968. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 983. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma= 999. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1015. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1030. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1046. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1061. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1076. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1091. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1105. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1120. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1134. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1148. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1162. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1176. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1190. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1203. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1217. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1230. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1243. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1256. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1268. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1281. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1293. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1305. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1317. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1328. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1340. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1351. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1362. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1374. MeV

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    Helicity-dependent differential cross section on deuteron at Egamma=1387. MeV

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    Data from Figs.14 and 15 in publication

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    Helicity asymmetry E for quasi-free proton at W=1165. MeV

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    Helicity asymmetry E for quasi-free proton at W=1195. MeV

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    Helicity asymmetry E for quasi-free proton at W=1225. MeV

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    Helicity asymmetry E for quasi-free proton at W=1255. MeV

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    Helicity asymmetry E for quasi-free proton at W=1285. MeV

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    Helicity asymmetry E for quasi-free proton at W=1315. MeV

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    Helicity asymmetry E for quasi-free proton at W=1339. MeV

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    Helicity asymmetry E for quasi-free proton at W=1357. MeV

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    Helicity asymmetry E for quasi-free proton at W=1375. MeV

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    Helicity asymmetry E for quasi-free proton at W=1393. MeV

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    Data from Figs.14 and 15 in publication

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    Helicity asymmetry E for quasi-free proton at W=1411. MeV

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    Data from Figs.14 and 15 in publication

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    Helicity asymmetry E for quasi-free proton at W=1429. MeV

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    Data from Figs.14 and 15 in publication

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    Helicity asymmetry E for quasi-free proton at W=1447. MeV

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    10.17182/hepdata.132014.v1/t94

    Helicity asymmetry E for quasi-free proton at W=1465. MeV

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    10.17182/hepdata.132014.v1/t95

    Helicity asymmetry E for quasi-free proton at W=1483. MeV

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    10.17182/hepdata.132014.v1/t96

    Helicity asymmetry E for quasi-free proton at W=1501. MeV

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    10.17182/hepdata.132014.v1/t97

    Helicity asymmetry E for quasi-free proton at W=1519. MeV

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    Helicity asymmetry E for quasi-free proton at W=1537. MeV

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    Helicity asymmetry E for quasi-free proton at W=1555. MeV

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    Helicity asymmetry E for quasi-free proton at W=1573. MeV

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    Helicity asymmetry E for quasi-free proton at W=1591. MeV

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    Helicity asymmetry E for quasi-free proton at W=1609. MeV

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    Helicity asymmetry E for quasi-free proton at W=1627. MeV

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    Helicity asymmetry E for quasi-free proton at W=1645. MeV

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    Helicity asymmetry E for quasi-free proton at W=1663. MeV

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    10.17182/hepdata.132014.v1/t106

    Helicity asymmetry E for quasi-free proton at W=1681. MeV

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    Helicity asymmetry E for quasi-free proton at W=1699. MeV

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    Helicity asymmetry E for quasi-free proton at W=1717. MeV

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    10.17182/hepdata.132014.v1/t109

    Helicity asymmetry E for quasi-free proton at W=1735. MeV

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    Helicity asymmetry E for quasi-free proton at W=1753. MeV

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    10.17182/hepdata.132014.v1/t111

    Helicity asymmetry E for quasi-free proton at W=1771. MeV

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    10.17182/hepdata.132014.v1/t112

    Helicity asymmetry E for quasi-free proton at W=1789. MeV

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    10.17182/hepdata.132014.v1/t113

    Helicity asymmetry E for quasi-free proton at W=1807. MeV

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    10.17182/hepdata.132014.v1/t114

    Helicity asymmetry E for quasi-free proton at W=1825. MeV

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    10.17182/hepdata.132014.v1/t115

    Helicity asymmetry E for quasi-free proton at W=1843. MeV

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    Helicity asymmetry E for quasi-free proton at W=1861. MeV

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    Helicity asymmetry E for quasi-free proton at W=1879. MeV

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    Helicity asymmetry E for quasi-free proton at W=1897. MeV

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    Helicity asymmetry E for quasi-free proton at W=1915. MeV

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    Helicity asymmetry E for quasi-free neutron at W=1165. MeV

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    Helicity asymmetry E for quasi-free neutron at W=1195. MeV

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    Helicity asymmetry E for quasi-free neutron at W=1225. MeV

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    Helicity asymmetry E for quasi-free neutron at W=1255. MeV

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    Helicity asymmetry E for quasi-free neutron at W=1285. MeV

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    Helicity asymmetry E for quasi-free neutron at W=1315. MeV

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    Helicity asymmetry E for quasi-free neutron at W=1339. MeV

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    Helicity asymmetry E for quasi-free neutron at W=1357. MeV

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    Helicity asymmetry E for quasi-free neutron at W=1375. MeV

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    Helicity asymmetry E for quasi-free neutron at W=1393. MeV

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    Data from Figs.16 and 17 in publication

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    Helicity asymmetry E for quasi-free neutron at W=1411. MeV

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    Data from Figs.16 and 17 in publication

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    Helicity asymmetry E for quasi-free neutron at W=1429. MeV

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    Data from Figs.16 and 17 in publication

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    Helicity asymmetry E for quasi-free neutron at W=1447. MeV

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    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t133

    Helicity asymmetry E for quasi-free neutron at W=1465. MeV

  • Eneut_15

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t134

    Helicity asymmetry E for quasi-free neutron at W=1483. MeV

  • Eneut_16

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t135

    Helicity asymmetry E for quasi-free neutron at W=1501. MeV

  • Eneut_17

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t136

    Helicity asymmetry E for quasi-free neutron at W=1519. MeV

  • Eneut_18

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t137

    Helicity asymmetry E for quasi-free neutron at W=1537. MeV

  • Eneut_19

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t138

    Helicity asymmetry E for quasi-free neutron at W=1555. MeV

  • Eneut_20

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t139

    Helicity asymmetry E for quasi-free neutron at W=1573. MeV

  • Eneut_21

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t140

    Helicity asymmetry E for quasi-free neutron at W=1591. MeV

  • Eneut_22

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t141

    Helicity asymmetry E for quasi-free neutron at W=1609. MeV

  • Eneut_23

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t142

    Helicity asymmetry E for quasi-free neutron at W=1627. MeV

  • Eneut_24

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t143

    Helicity asymmetry E for quasi-free neutron at W=1645. MeV

  • Eneut_25

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t144

    Helicity asymmetry E for quasi-free neutron at W=1663. MeV

  • Eneut_26

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t145

    Helicity asymmetry E for quasi-free neutron at W=1681. MeV

  • Eneut_27

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t146

    Helicity asymmetry E for quasi-free neutron at W=1699. MeV

  • Eneut_28

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t147

    Helicity asymmetry E for quasi-free neutron at W=1717. MeV

  • Eneut_29

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t148

    Helicity asymmetry E for quasi-free neutron at W=1735. MeV

  • Eneut_30

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t149

    Helicity asymmetry E for quasi-free neutron at W=1753. MeV

  • Eneut_31

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t150

    Helicity asymmetry E for quasi-free neutron at W=1771. MeV

  • Eneut_32

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t151

    Helicity asymmetry E for quasi-free neutron at W=1789. MeV

  • Eneut_33

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t152

    Helicity asymmetry E for quasi-free neutron at W=1807. MeV

  • Eneut_34

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t153

    Helicity asymmetry E for quasi-free neutron at W=1825. MeV

  • Eneut_35

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t154

    Helicity asymmetry E for quasi-free neutron at W=1843. MeV

  • Eneut_36

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t155

    Helicity asymmetry E for quasi-free neutron at W=1861. MeV

  • Eneut_37

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t156

    Helicity asymmetry E for quasi-free neutron at W=1879. MeV

  • Eneut_38

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t157

    Helicity asymmetry E for quasi-free neutron at W=1897. MeV

  • Eneut_39

    Data from Figs.16 and 17 in publication

    10.17182/hepdata.132014.v1/t158

    Helicity asymmetry E for quasi-free neutron at W=1915. MeV

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