Spectroscopy of nuclear systems. Progress report, January 1--December 31, 1974 Page: 41 of 53
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Anti-Compton gamma-ray spectra were measured at emission angles
of 25", 470, 65 , 75. and 90* in order to determine the lifetimes of
levels populated via the 51Zr(c,2ny)93Mo reaction via the Doppler-shift
attenuation method. The experiment was performed at bombarding energies
of 21, 24, 27, and 30 MeV. Gamma-ray energies were observed up to 2300 keV.
Internal energy standards were counted simultaneously with the reaction
gamma-rays to provide an accurate measurement of the photopeak centroid
energies. A computer program to compute to the cone of recoiling 93Mo
nuclei following the (a,2n) reaction is being developed. This information
combined with cascade feeding systematics discussed above and the bound
state feeding determined by Y-Y coincidence experiments will allow life-
time measurements of the levels for t r 2 psec using the LSS20,21 stopping
power of the recoiling ions.
A Y-Y coincidence experiment "ill also be performed at an alpha
particle bombarding energy of 30 HeV. These data are needed to construct
the complete decay scheme of levels populated in the 91Zr(a,2nY) reactions.
(L. L. Rutledge, E. S. Macias and D. G. Sarantites)
/ D. G-Facter Measurements
Doppler-shif t at temuation measurements in this lab19 have indicated
that the 7+ level at 2282 key in 36Co and the 6 level at 3389 keY in 56re
have lifetimes >2 psec. The levels are populated via the 54Fe(a,pn) and
(u,2p) reaction respectively at an alpha particle bombarding energy of 24
HeV. These levels are good candidates for magnetic moment measurements
using the implantation perturbed angular correlation technique. However it
20. L. Lindbard, M. Scharff and H.E. Schiott, K. Dan. Vidensk. Selsk.
Nat.-Fys. Medd. 33, (14) (1963).
21. A.E. Blaugrund, Nucl. Phys. 88, 501 (1966).
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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/m1/41/: accessed April 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.