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N-17, A Delayed Neutron Emitter

Description: The decay scheme of a 4.2 second neutron emitter has been investigated in detail. Chemical and physical evidence shows that it is N{sup 17}, which emits beta rays to a broad excited state of O{sup 17}, which then breaks up into a neutron plus O{sup 16}. The energy spectrum of the neutrons is determined by measuring the energies of the O{sup 16} recoils in a proportional counter. The neutrons have a most probable energy of 0.9 Mev, a 'half width' of less than .5 Mev, and an upper limit of about 2 Mev. {beta}-recoil coincidences are observed, as predicted by the Bohr-Wheeler theory, and the {beta}-ray energy is measured by absorption. The beta rays in coincidence with neutrons have an upper limit of 3.7 {+-} 0.2 Mev. Beta-rays directly to the ground stat of O{sup 17} are not observed because of high background effects, but should have an energy of 8.7 Mev. Some evidence is presented to show that energy is conserved in the {beta}-n transition through the broad excited state in O{sup 17}.
Date: November 5, 1948
Creator: Alvarez, L. W.
Item Type: Report

20-MM aircraft gun matériel M1 and M2.

Description: "In addition to a description of the 20-mm aircraft gun matériel M1 and M2, this manual contains technical information required for the identification, use, and care of the matériel."
Date: April 2, 1942
Creator: United States. War Department.
Item Type: Book

75-mm howitzer materiel.

Description: This is a World War II-era technical manual for the 75mm Howitzer. It contains information on use, maintenance, assembly, and other aspects of this weapon.
Date: June 21, 1941
Creator: United States. Army. Ordnance Department.
Item Type: Book

85 million Americans hold war bonds.

Description: A color image of a man's hand clenching war bonds, as the Statue of Liberty's hand holds its torch above, against a starry night sky. The man's hold on the bonds mimics the statue's hold on the torch.
Date: 1945
Creator: United States. Dept. of the Treasury.
Item Type: Poster

100 Area monthly reports for 1947

Description: Activities concerned with the 100 area at the Hanford plant for the period of January, 1947, are described. A chronology of pile events, tube corrosion, and scrams are included.
Date: January 1947
Item Type: Report

234-5 Project ventilation specifications

Description: This brief memo from the 300 area of the Hanford plant, July 13, 1948, describes the need to redesign the ventilation system so as to minimize hazards associated with performing maintenance work.
Date: July 13, 1948
Creator: Work, J.B.
Item Type: Report