National Institute of Standards and Technology, Acquisition and Assistance Division, Building 301, Room B117, Gaithersburg, MD

66 -- REPLACEMENT NEUTRON VELOCITY SELECTOR SOL 52SBNB6C9132 DUE 060596 POC Marilyn Carter (301) 975-6335/Pauline E. Mallgrave (301) 975-6330 The National Institute of Standards and Technology (NIST) proposes to negotiate on a sole source basis with Dornier GmbH (Deutsche Aerospace) of Friedrichshafen, Germany for a replacement Neutron Velocity Selector (NVS). This NVS shall be able to transmit neutrons in the wavelength range of at least 0.45 nm to 4.5 nm under standard operation with a resolution of 20%. By tilting the range shall be extended down to 0.30 nm. The transmission of the NVS under standard operation shall range from 80% to 95%. For tilt operation the transmissions shall be better than 75%. The speed constancy of the instrument shall be 0.5%. The blade material shall be carbon fiber in epoxy with 10B as the absorbing material. The windows material shall be aluminum of less than 0.5 mm thickness or of beryllium of comparable transmission. The housing shall be made of aluminum. This NVS is intended for use as a replacement backup for the two NVSs produced by Dornier and currently in use at NIST.--Delivery required 150 days after contract award--FOB Destination Gaithersburg, MD --Statutory authority is 41USC 253(c)(1)--Only one responsible source that can meet the requirements of the Government--See Note 22 and Note 26 (0110)

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