First results of the large COMPASS <f>6LiD</f> polarized target

Authors :: Ball, J.
Baum, G.
Berglund, P.
Daito, I.
Doshita, N.
Gautheron, F.
Goertz, St.
Harmsen, J.
Hasegawa, T.
Heckmann, J.
Horikawa, N.
Iwata, T.
Kisselev, Yu.
Koivuniemi, J.
Kondo, K.
Le Goff, J.M.
Magnon, A.
Meier, A.
Meyer, W.
Radtke, E.
Source :: Nuclear Instruments & Methods in Physics Research Section A. Feb2003, Vol. 498 Issue 1-3, p101. 11p.
Publication Year :: 2003
Abstract: The COMPASS (NA58) experiment at CERN operates with a large solid polarized target (PT) to study the spin structure of the nucleon. The COMPASS PT system started its operation with the target material <f>6LiD</f> in 2001. Deuteron polarizations of <f>+54.2%</f> and <f>−47.1%</f> were achieved in a <f>3He/4He</f> dilution refrigerator at a magnetic field of <f>2.5 T</f>. The equal spin temperature (EST) concept was found to hold among the deuteron, the <f>6Li</f> and the <f>7Li</f> nuclei during the dynamic nuclear polarization (DNP) process. The agreement with the EST concept allows the permanent monitoring of only one nuclear species by the nuclear magnetic resonance (NMR) method. [Copyright &y& Elsevier]