| Article | |
| Report number | CERN-PPE-97-066 |
| Title | Measurement of proton and nitrogen polarization in ammonia and a test of equal spin temperature |
| Author(s) | NA47 Collaboration Pokaż wszystkich 126 autorów |
| Affiliation | (Univ. Bielefeld) ; (Bogaziçi Univ. and Istanbul Technical Univ.) ; (Univ. Bochum) ; (UCLA) ; (CERN) ; (Univ. Freiburg) ; (GKSS Geesthacht) ; (Helsinki Univ. Technology, Low Temperature Laboratory and Institute of Particle Physics Technology Espoo) ; (Univ. Houston) ; (JINR, Laboratory of Particle Physics, Dubna) ; (Univ. Mainz) ; (Univ. Mons) ; (Univ. Munich) ; (Nagoya Univ., CIRSE Nagoya) ; (NIKHEF) ; (Delft Univ. Technology) ; (FOM and Free Univ. Amsterdam) ; (Northwestern Univ. Evanston) ; (C.E.A.\ Saclay, DAPNIA Gif-sur-Yvette) ; (Univ. Santiago, Santiago de Compostela) ; (Tel Aviv Univ., School of Physics Tel Aviv) ; (INFN Trieste and Univ. Trieste) ; (Uppsala Univ.) ; (Univ. Virginia Charlottesville) ; (Soltan Institute for Nuclear Studies and Warsaw Univ.) ; (Yale Univ. New Haven) |
| Publication | 1998 |
| Imprint | 16 Jun 1997 |
| Number of pages | 28 |
| In: | Nucl. Instrum. Methods Phys. Res., A 419 (1998) 60 |
| DOI | 10.1016/S0168-9002(98)00916-4 |
| Subject category | Detectors and Experimental Techniques |
| Accelerator/Facility, Experiment | CERN SPS ; SMC NA47 |
| Abstract | The 1996 data taking of the SMC experiment used polarized protons to measure the spin dependent structure function g1 of the proton. Three liters of solid granular ammonia were irradiated at the Bonn electron linac in order to create the paramagnetic radicals which are needed for polarizing the protons. Proton polarizations of ±(90±2.5)% were routinely reached. An analysis based on a theoretical line-shape for spin-1 systems with large quadrupolar broadening was developed which allowed the nitrogen polarization in the ammonia to be determined with a 10% relative error. The measured quadrupolar coupling constant of 14N agrees well with earlier extrapolated values. The polarization of the nitrogen nuclei was measured as a function of the proton polarization in order to provide a test of the equal spin temperature (EST) hypothesis. It was found to be closely valid under the dynamic nuclear polarization conditions with which the protons are polarized. Large deviations from EST could be induced by cross relaxing the proton and nitrogen spin systems at low fields. Nitrogen polarizations up to 40\% were reached by these means. |
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