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

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

A2

Collaboration

•

F. Cividini
(
- Mainz U., Inst. Kernphys.
)

Mar 1, 2022

23 pages

Published in:

Eur.Phys.J.A 58 (2022) 6, 113

Published: Jun 30, 2022

e-Print:

2203.00535 [nucl-ex]

DOI:

10.1140/epja/s10050-022-00760-4

Experiments:

MAINZ-A2

View in:

reference search6 citations

Citations per year

Abstract: (Springer)

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.

Note:

22 pages, 22 figures; version accepted for publication on Eur. Phys. J. A

helicity: asymmetry
helicity: dependence
pi0: photoproduction
photon: beam
deuteron: target
photon: energy
nuclear matter: effect
p: target
Crystal Ball
deuterium

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