Abstract
A measurement of vector analyzing powers in elastic deuteron-carbon scattering has been performed at the Cooler Synchrotron COSY of Forschungszentrum Jülich, Germany. Seven kinetic beam energies between 170 and 380 MeV have been used. A vector-polarized beam from a polarized deuteron source was injected, accelerated to the final desired energy and stored in COSY. A thin needle-shaped diamond strip was used as a carbon target, onto which the beam was slowly steered. Elastically scattered deuterons were identified in the forward direction using various layers of scintillators and straw tubes. Where data exist in the literature (at 200 and 270 MeV), excellent agreement of the angular shape was found. The beam polarization of the presented data was deduced by fitting the absolute scale of the analyzing power to these references. Our results extend the world data set and are necessary for polarimetry of future electric dipole moment searches at storage rings. They will as well serve as an input for theoretical description of polarized hadron-hadron scattering.
Highlights
The main motivation for the measurements arise from plans to search for electric dipole moments (EDMs) of charged hadrons in storage rings [1]
A storage ring EDM measurement is based on the observation of a vertical polarization build-up of an initially horizontal polarization
For the extraction of the vector analyzing power, the beam polarization was set to cycle through three polarization states: Unpolarized (P0), upwards polarized in the laboratory frame along the vertical axis (Py = P↑), and downwards polarized along the vertical axis (Py = −P↓)
Summary
The main motivation for the measurements arise from plans to search for electric dipole moments (EDMs) of charged hadrons in storage rings [1]. The existence of electric dipole moments is connected to CP-violation and is closely related to fundamental questions of the dominance of matter over anti-matter in the universe [2]. A storage ring EDM measurement is based on the observation of a vertical polarization build-up of an initially horizontal polarization. This build-up is proportional to the EDM itself and to the analyzing power of the scattering process used to determine the beam polarization. The statistical error of the EDM measurement is inversely proportional the absolute value of the analyzing power. It is important to know the analyzing power in a wide energy range
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
