Andrews, D.E.
Photoproduction
DSIG/DOMEGA
Max results
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Compton Scattering from the Deuteron and Extracted Neutron Polarizabilities

Lundin, M. ; Adler, J.O. ; Boland, M. ; et al.
Phys.Rev.Lett. 90 (2003) 192501, 2003.
Inspire Record 586101 DOI 10.17182/hepdata.31727

Differential cross sections for Compton scattering from the deuteron were measured at MAX-lab for incident photon energies of 55 MeV and 66 MeV at nominal laboratory angles of $45^\circ$, $125^\circ$, and $135^\circ$. Tagged photons were scattered from liquid deuterium and detected in three NaI spectrometers. By comparing the data with theoretical calculations in the framework of a one-boson-exchange potential model, the sum and difference of the isospin-averaged nucleon polarizabilities, $\alpha_N + \beta_N = 17.4 \pm 3.7$ and $\alpha_N - \beta_N = 6.4 \pm 2.4$ (in units of $10^{-4}$ fm$^3$), have been determined. By combining the latter with the global-averaged value for $\alpha_p - \beta_p$ and using the predictions of the Baldin sum rule for the sum of the nucleon polarizabilities, we have obtained values for the neutron electric and magnetic polarizabilities of $\alpha_n= 8.8 \pm 2.4$(total) $\pm 3.0$(model) and $\beta_n = 6.5 \mp 2.4$(total) $\mp 3.0$(model), respectively.

6 data tables
Table 1

Centre of mass differential cross sections for deuteron compton scattering at incident photon energy 54.6 MeV.

Table 2

Centre of mass differential cross sections for deuteron compton scattering at incident photon energy 54.9 MeV.

Table 3

Centre of mass differential cross sections for deuteron compton scattering at incident photon energy 55.9 MeV.

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Lambda Polarization at 90-degrees in K+Lambda Photoproduction

Groom, D.E. ; Marshall, J.H. ;
Phys.Rev. 159 (1967) 1213-1219, 1967.
Inspire Record 52237 DOI 10.17182/hepdata.26579

The Λ polarization and the differential cross section for the reaction γ+p→K++Λ have been measured, using the Caltech synchrotron, at 90° in the c.m. system and at laboratory photon energies of 1100, 1200, and 1300 MeV. Protons from the asymmetric decay of the Λ were detected by counters placed above and below the production plane. Kaons were identified by their behavior in a thick range telescope. Polarization results were PΛ=+0.34±0.09 at 1100 MeV, +0.30±0.07 at 1200 MeV, and +0.08±0.07 at 1300 MeV, where PΛ was measured in the p^γ×p^Λ direction. The differential cross section was constant with energy at 0.14±0.01 μb/sr. Although the apparent bump in the polarization at 90° at a total energy of ≈1700 MeV adds support to models which invoke a resonance here, no really new conclusions can be reached.

2 data tables
Table 1

No description provided.

Table 2

No description provided.