Experimental limit for the circular polarization of the 1081 keV gamma ray in /sup 18/F

Journal Article · Thu Sep 01 04:00:00 EDT 1988 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.38.1195· OSTI ID:7124436

Bini, M; Fazzini, T F; Poggi, G; Taccetti, N

A measurement of the circular polarization P/sub ..gamma../ of the 1081 keV ..gamma..-ray in /sup 18/F is reported. The result is P/sub ..gamma../ = (2.7 +- 5.7) x 10/sup -4/. The reaction used was /sup 16/O(/sup 3/He,p)/sup 18/F with a 3.4 MeV /sup 3/He/sup +/ beam of an intensity of 7 ..mu..A impinging on a windowless water target. The circular polarization was measured with a four-prong transmission-type Compton polarimeter. The measurement of the analyzing power of the polarimeter is presented. Gamma rays were detected by means of 130 cm/sup 3/ p-type germanium detectors placed behind the prongs. Four independent data acquisition channels were used: pile-up losses at a counting rate of 60 kcps were kept lower than 15%, owing to the use of trapezoidal shapers. Systematic effects of instrumental origin are discussed and found to give negligible contributions with respect to the statistical uncertainty. The calculation of the asymmetries is performed using different estimators; an extensive comparison of the various methods is presented. The result of the experiment, when averaged with those of the other experiments on /sup 18/F carried out until now, gives a grand average P/sub ..gamma../ = (1.2 +- 3.9) x 10/sup -4/. This result is compared with recent theoretical estimates.

• Research Organization: Department of Physics, Universita di Firenze, 50125 Firenze and Istituto Nazionale di Fisica Nucleare, 50125 Firenze, Italy
• OSTI ID: 7124436
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 38:3; ISSN PRVCA
• Country of Publication: United States
• Language: English

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