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19 April 2024 |
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A comprehensive analysis of differential cross sections and analyzing powers in the proton-deuteron break-up channel at 135 MeV | H. Tavakoli-Zaniani
; M. Eslami-Kalantari
; H. R. Amir-Ahmadi
; M. T. Bayat
; A. Deltuva
; J. Golak
; N. Kalantar-Nayestanaki
; St. Kistryn
; A. Kozela
; H. Mardanpour
; J. G. Messchendorp
; M. Mohammadi-Dadkan
; A. Ramazani-Moghaddam-Arani
; R. Ramazani-Sharifabadi
; R. Skibinski
; E. Stephan
; H. Witala
; | Date: |
27 Aug 2020 | Abstract: | A selection of measured cross sections and vector analyzing powers, Ax and
Ay, are presented for the pd break-up reaction. The data are taken with a
polarized proton beam energy of 135 MeV using the Big Instrument for
Nuclear-polarization Analysis (BINA) at KVI, the Netherlands. With this setup,
Ax is extracted for the first time for a large range of energies as well as
polar and azimuthal angles of the two outgoing protons. For most of the
configurations, the results at small and large relative azimuthal angles differ
in behavior when comparing experimental data with the theoretical calculations.
We also performed a more global comparison of our data with theoretical
calculations using a chi-square ($chi^2$) analysis. The cross-section results
show huge values of $chi^2$/d.o.f.. The absolute values of $chi^2$/d.o.f. for
the components of vector analyzing powers, Ax and Ay, are smaller than the ones
for the cross section, partly due to larger uncertainties for these
observables. However, also for these observables no satisfactory agreement is
found for all angular combinations. This implies that the present models of a
three-nucleon force are not able to provide a satisfactory description of
experimental data. | Source: | arXiv, 2008.12177 | Services: | Forum | Review | PDF | Favorites |
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