Spectroscopy of nuclear systems. Progress report, January 1--December 31, 1974 Page: 32 of 53
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We have measured the lifetimes of many of the low-lying levels in
93No populated via the 3Nb(p,ny) reaction using the Doppler-shift attenua-
tion method. The experiment was performed at proton bombarding energies
of 3.7 and 4.4 MeV. Relatively few levels were excited at the lawer energy
and the results were interpreted in terms of previously observed levels.
Many more levels were populated in an experiment carried out at a proton
bombarding energy of 4.4 HeV. The anti-Compton y-ray spectrum for a 4.4
HeV proton bombardment is shown in Figs. 9 and 10. A y-y coincidence
experiment was performed at 4.4 MeV in order to establish the complete
decay scheme of the levels populated which is Shown in Fit. Z1 We ob-
served 47 levels below 3.07 MeV of excitation, and obtained lifetime infor-
mation for 40 of these levels listed in Table VI. In Fig. 12, the observed
photopeak centroid energy is plotted as a function of the cosine of the
angle of emission for the transitions observed fn the flb(pny) reaction.
The solid line is the least-squares fit to the data. The observed attenu-
ated Doppler-shift, given by the slope of the least-squares fitted line, is
indicated in the figure. The results are compared with previous determina-
tion where possible. This work has been completed and is being prepared
(L. L. Rutledge, E. S. Macias and D. G. Sarantite8)
3. Lifetime Measurements of Levels in 9 via the Recoil Dietance
As described in the previous section of this report many of the life-
times of the low lying-levels in 93Mo have been determined by the Doppler-
shift attenuation method using the 93Nb(pany) No reaction at a proton
bombarding energy of 4.4 MeV. However, this technique is not sensitive to
lifetime. >2 psec. We have observed an interesting level at E - 2430 keV
which decays via a 268-keV gasms ray to the 13/2 level at 2162 keV. This
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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/m1/32/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.