Spectroscopy of nuclear systems. Progress report, January 1--December 31, 1974 Page: 25 of 53
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F. Structure of N - 81 Nuclei: Levels of '*id and 13Ce Populated
in Beta Decay
The levels of d and 58Ce81, nuclei with a single hole in the
N 82 neutron shell, are of particular interest because they are expected
to be well characterized by the particle-core coupling model. Calcula-
tions using this model have been performed for N R 81 nucleili however
these calculations can not account for the large number of levels below
135 12 isotones
2 HeV seen in 54 812. The study of N T 81/has been extended to d
and 139Ce to study these levels in higher Z nuclides to see if the discrep-
ancy with theory exists as the proton orbitals become fuller.
This work has been completed and will be submitted for publication
shortly. An abstract of the work is given below.
The nuclear level structure of " d and "39Ce has been
investigated by studying the decay of 20.9-min 141Fm
produced via the 14 r3He,3n) reactioD and the decay of
4.5-hour 139Pr produced by the 14%r(y. n) reaction.
Anti-Compton ga --ray spectra were taken as a function
of time in order to confirm assignment of the d and
139Ce gamma rays (see Fig. 6). For the 141m decay,
anti-Cmpton and gamma-gamma coincidence measurements
were used to deduce a decay scheme that included nine pre-
viously unreported levels in 141Nd and incorporates 67 of
the 70 gamma rays attributed to the decay of Pm (see
Figs. 7 and 8). The results of this work are compared to
recent measurement in the N - 81 isotopes.
The study of 139Pr decay was performed in collaboration with R. A.
Meyer of Lawrence Livermore Laboratory.
(M. R. Zalutsky, E. S. Macias, R. A. Meyer)
11. Heyde and Brussard, Z. Phys. 259, 15 (1973).
12. E.S. Macias and W.D. Walters, Nucl. Phys. A169, 305 (1971).
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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/m1/25/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.