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

Abstract

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 measuredmore » 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.« less

Authors:
;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN
Sponsoring Org.:
US Atomic Energy Commission (AEC)
OSTI Identifier:
4584130
Report Number(s):
ORNL-P-1353; CONF-650706-9
Journal ID: OCLC: 495928297
NSA Number:
NSA-19-035402
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Conference
Journal Name:
Proceedings
Additional Journal Information:
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
Subject:
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

Citation Formats

Harvey, J. A., and Slaughter, G. G. HIGH RESOLUTION MEASUREMENTS OF GAMMA RAYS FROM THERMAL AND RESONANCE NEUTRON CAPTURE IN 117Sn, 118Sn and 120Sn. United States: N. p., 1965. Web.
Harvey, J. A., & Slaughter, G. G. HIGH RESOLUTION MEASUREMENTS OF GAMMA RAYS FROM THERMAL AND RESONANCE NEUTRON CAPTURE IN 117Sn, 118Sn and 120Sn. United States.
Harvey, J. A., and Slaughter, G. G. 1965. "HIGH RESOLUTION MEASUREMENTS OF GAMMA RAYS FROM THERMAL AND RESONANCE NEUTRON CAPTURE IN 117Sn, 118Sn and 120Sn". United States. https://www.osti.gov/servlets/purl/4584130.
@article{osti_4584130,
title = {HIGH RESOLUTION MEASUREMENTS OF GAMMA RAYS FROM THERMAL AND RESONANCE NEUTRON CAPTURE IN 117Sn, 118Sn and 120Sn},
author = {Harvey, J. A. and Slaughter, G. G.},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/4584130}, journal = {Proceedings},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1965},
month = {Fri Jan 01 00:00:00 EST 1965}
}

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