HIGH RESOLUTION MEASUREMENTS OF GAMMA RAYS FROM THERMAL AND RESONANCE NEUTRON CAPTURE IN ¹¹⁷Sn, ¹¹⁸Sn and ¹²⁰Sn

Conference · Fri Jan 01 00:00:00 EST 1965 · Proceedings

OSTI ID:4584130

Harvey, J. A.; Slaughter, G. G.

High resolution measurements of the gamma ray spectra from thermal and resonance neutron capture in ¹¹⁷Sn, ¹¹⁸Sn and ¹²⁰Sn have been made with a lithium-drifted germanium detector. A beam of pure thermal neutrons was obtained by double reflection from inconel mirrors of a reactor beam from the Oak Ridge Research Reactor. A cadmium filtered reactor beam served as the source of resonance neutrons. Earlier measurements of the gamma rays from the isotopes of tin with a NaI spectrometer had demonstrated the value of using both thermal and resonance energy neutrons and the need for higher resolution of the gamma rays. The lithium-drifted germanium crystal was 2.6 cm² in area by 7 mm thick and was furnished by R. J. Fox, ORNL. For high energy gamma rays (> ≈ 2000 keV) the pair production process with the subsequent escape of both annihilation quanta is the predominant process. Above 4000 keV the resolution was 10-15 keV for runs of several days duration and the energies of the lines may be measured to ± 10 keV absolute and ± 5 keV relative. For low energy gamma rays (< ≈ 1500 keV) the energy resolution was 5-10 keV and the energies may be measured to an absolute accuracy of 2 to 4 keV. The relative efficiency of the detector vs gamma ray energy has been determined for both the double escape peak and the full energy peak. In the energy range from 600 to 1600 keV deposited in the crystal, there is some ambiguity as to whether a weak peak is a full energy or a double escape peak.

• Research Organization: Oak Ridge National Lab., TN
• Sponsoring Organization: US Atomic Energy Commission (AEC)
• DOE Contract Number: W-7405-ENG-26
• NSA Number: NSA-19-035402
• OSTI ID: 4584130
• Report Number(s): ORNL-P-1353; CONF-650706-9
• Journal Information: Proceedings, Conference: International Conference on the Study of Nuclear Structure with Neutrons, Antwerp, Belgium, July 19-23, 1965; Other Information: FRom International Conference on the Study of Nuclear Structure with Neutrons, Antwerp. Orig. Receipt Date: 31-DEC-65
• Country of Publication: United States
• Language: English

Related Subjects

PHYSICS
Nuclear Properties and Reactions
BELGIUM
CONFERENCE
ENERGY LEVELS
GAMMA RADIATION
MEASURED VALUES
NEUTRON BEAMS
NUCLEAR REACTIONS
PARITY
RESONANCE NEUTRONS
SPECTRA
SPIN
THERMAL NEUTRONS
TIN 117
TIN 118
TIN 119
TIN 120
TIN 121