Spectroscopy of nuclear systems. Progress report, January 1--December 31, 1974 Page: 31 of 53
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extra core neutron is assumed to occupy the 2d5/2' 19712, and 311/2 orbi-
tals, and is coupled to the vibrational states of the 92Mo core. The 9214
core space is truncated to inclu de up to two-phonon quadrupole excitations.
This model gives a good description of the first 1/2+, 7/2+, 9/2 , 3/2
and 5/2+ excited states. The 13/2 and 2112 levels are, however, not pre-
A further test of the accuracy of the various wave functions would be
their ability to predict the transition rates or lifetimes of the nuclear
states. Choudhury and Clemens have computed the lifetimes of the first
1/2+, 7/2 and 9/2 excited states in No. However no calculations using
a large basic set have been reported for the transition rates of 3M.
The fact that the levels in 9 can be reached via both the (pny)
and (a,2ny) reactions makes 9 an interesting candidate for study. The
93Nb(p,n-y) reaction perferentially populates the lower spin levels in 93Mo,
while the 91Zr(c,2ny) reaction will preferentially populate the higher spin
levels. However, the ground state spin of Nb is 9/2, while the ground
state spin of 91Zr is 5/2. Hence we expect some redundancy of the levels
populated in the two reactions. There exist codes with which one may com-
pute the cross sections and alignments for levels populated via the (p,ny)
reaction within the framework of the cotpaund statistical model. For the
(o,2ny) reaction, one usually must resort to more phenomenalogical pro-
cedures.17. Thus the (p,ny) reaction provides the preliminary ground work
necessary to unambiguously extract information from the more complex
16. Eric Sheldon and Richard Michael Strang, Comput. Phys, Coanun. L 35
17. T. Yamazaki, Bucl. Data A3, 1 (1967).
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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/m1/31/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.