The new frozen spin target at MAMI

Journal Article · Fri Nov 15 04:00:00 EST 2013 · Physics of Particles and Nuclei

DOI:https://doi.org/10.1134/S1063779613060221· OSTI ID:22977241

Thomas, A. ^[1]; Borisov, N. S. ^[2]; Arends, H. -J. ^[1]; Fedorov, A. N. ^[2]; Gurevich, G. M. ^[3]; others, and

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1. Institut für Kernphysik, Universität Mainz, Mainz (Germany)
2. Joint Institute for Nuclear Research, Dubna (Russian Federation)
3. Institute for Nuclear Research, Russian Academy of Sciences, Moscow (Russian Federation)

The new frozen spin polarized target for experiments at the polarized beam of the real photon facility A2 of the MAMI accelerator is described. The A2-collaboration at the Mainz Microtron MAMI is measuring photon absorption cross section using circularly and linearly polarized photons up to the energy of 1.5 GeV. The photons are produced in the’ Bremsstrahlungs’ process. In the years 2005/2006 the Crystal Ball detector with its unique capability to cope with multi photon final states was set up in Mainz. Since 2010 the experimental apparatus has been completed by a polarized target. The horizontal dilution refrigerator of the Frozen-Spin Target has been constructed and is operated in close cooperation with the Joint Institute for Nuclear Research in Dubna, Russia. The system offers the opportunity to provide longitudinally and transversely polarized protons and deuteron. In this paper the operation experience of this new Frozen-Spin Target and first results from the runs in 2010 and 2011 are presented.

• OSTI ID: 22977241
• Journal Information: Physics of Particles and Nuclei, Journal Name: Physics of Particles and Nuclei Journal Issue: 6 Vol. 44; ISSN 1063-7796
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
MULTI-PHOTON PROCESSES
PHOTONS
POLARIZED BEAMS
POLARIZED TARGETS
SPIN ORIENTATION