Neutron production at the GSI fragment separator

The fragment separator at the future GSI facility has to be regarded as a strong source of neutron radiation. The shielding design of the instrument requires knowledge of the produced neutron fields. In this paper the neutron fields of the present fragment separator were characterized by the use of thermoluminescence dosimetry applied during an irradiation period of uranium-beams impinging on a thin Be-target with a mean energy of 0.8 GeV/u. In addition time of flight measurements of neutrons were performed in Cave B of GSI. Neutron spectra produced by carbon and uranium beams at 1 GeV/u (thick iron target, 10 x 10 x 20 cm"3) for the angular range from 0 to 90 relative to the incident ion beam were measured with a BaF_2 scintillator detection system. Conclusions for the shielding design of the planned superconducting fragment separator are drawn on the basis of the measured dose distributions at the present fragment separator. (orig.)Available from TIB Hannover: RO 801(2002-32) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman