Spectroscopy of nuclear systems. Progress report, January 1--December 31, 1974 Page: 44 of 53
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C. A SiRple Fat Sueeping System for Extracted Cyclatron jeams
This work has been completed and published in Nuclear Instruments and
Methods 119, 213 (1974). A reprint of this article is appended to this
report. The abstract is given below:
A simple system for sweeping an extracted cyclotron beam
on and off an adjustable aperture at various repetition
rates and duty cycles is described. This system permits
lifetime measurements of delayed Y-rays to be made over
a range of 0.5 to 5000 Vs. The application of this system
for the study of the 3.29 and 159 Ps isomerie states in
Sn populated by the (p,ny) reaction at 8.0 MeV is
(J. T. Hood, R. A. Coldworm, E. S.
Macias and D. 0. Saruntites)
D. Development of an Electron Gun for Thin Target Fabrication
The plunger apparatus for recoil distance measurements requires
targets of 050 ugm/a2 thickness. In order to prepare thin plunger targets
such as niobium (mp.p = 2468' C) and sirconium (m.p. - 185 C) a Varian 2-
SM single crucible electron gun evaporation source has been obtained. This
source utilizes permanant-magnet focusing, and can achieve target tempera-
tures to 35000 C. Safety interlocks on the cooling water and filament
supply have been installed. High vacuum-high voltage interlocks are pres-
ently being installed. The accelerating voltage is 4000 volts. We have
achieved an emission current of 350 ma for 2 min at the required accelerat-
ing voltage. An emission current of 500 ma must be sustained in order to
evaporate the niobium or zirconium metal
(R. E. Head, J. Hood, L. L.
Rutledge, and E. S. Macias)
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Macias, E. S. Spectroscopy of nuclear systems. Progress report, January 1--December 31, 1974, report, January 1, 1974; St. Louis, Missouri. (https://digital.library.unt.edu/ark:/67531/metadc1020885/m1/44/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.