Accession Number : AD0649805

Title :   STUDY OF THERMAL NEUTRON CAPTURE GAMMA RAYS USING A LITHIUM-DRIFTED GERMANIUM SPECTROMETER,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s) : Orphan,Victor John ; Rasmussen,Norman C.

Report Date : JAN 1967

Pagination or Media Count : 206

Abstract : A gamma-ray spectrometer, using a 30 cc coaxial Ge(Li) detector, which can be operated as a pair spectrometer at high energies and in the Compton suppression mode at low energies provides an effective means of obtaining thermal neutron capture gamma spectra over nearly the entire capture gamma energy range. The energy resolution (fwhm) of the spectrometer is approximately 0.5% at 1 MeV and 0.1% at 7 MeV. Capture gamma-ray energies can be determined to an accuracy of about 1 keV. The relatively high efficiency of this spectrometer allows the use of an external neutron beam geometry, which simplifies sample changing. Using a 4096 channel pulse height analyzer, the capture gamma spectrum of an element may be obtained in about one day. Low cross section (order of 0.1 b) elements with many weak intensity gammas may be studied. Over 100 gamma rays have been identified in the spectrum of one such element, Zr. The spectra of Be, Sc, Fe, Ge, and Zr are presented. (Author)

Descriptors :   (*NUCLEAR RADIATION SPECTROMETERS, *SEMICONDUCTOR DEVICES), (*NEUTRON CAPTURE GAMMA RAYS, GAMMA RAY SPECTRA), (*GAMMA RAY SPECTROSCOPY, INSTRUMENTATION), GAMMA COUNTERS, GERMANIUM, RESOLUTION, ACCURACY, NEUTRON BEAMS, THERMAL NEUTRONS, BERYLLIUM, IRON, SCANDIUM, GERMANIUM, ZIRCONIUM, NUCLEAR ENERGY LEVELS, NUCLEAR BINDING ENERGY

Subject Categories : Nuclear Instrumentation
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE