Near-yrast structure of ${}^{149}\mathrm{Pr}$

The neutron-rich nucleus ${}^{149}\mathrm{Pr}$ has been studied by means of prompt and delayed $\gamma$-ray spectroscopy using the EUROGAM2 and Gammasphere arrays of Ge detectors. New spins have been assigned to a previously reported band and it is interpreted as having a $h_{11/2}$ proton structure, from a comparison with quasiparticle-rotor model calculations. The strength of octupole correlations in odd-$Z$ nuclei of the region is discussed.

Figure 1

Differences between excitation energies of 11/$2{}^{-}$ and 5/$2{}^{+}$ levels in odd-$Z$, neutron-rich lanthanide nuclei. The data are taken from Refs. [2, 4, 5, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28].

Figure 2

A $\gamma$ spectrum doubly gated on 219.7- and 416.0-keV lines in the ${}^{248}\mathrm{Cm}$ fission data.

Figure 3

LEPS $\gamma$ spectra gated on (a) 219.7- and 330.3-keV and (b) 102.6- and 219.7-keV lines in ${}^{248}\mathrm{Cm}$ data. See text for details on the sum in panel (b).

Figure 4

A $\gamma$ spectrum doubly gated on 219.7- and 330.3-keV lines in ${}^{252}\mathrm{Cf}$ fission data.

Figure 5

Level scheme of ${}^{149}\mathrm{Pr}$, as obtained in this work.

Figure 6

A $\gamma$-ray spectrum doubly gated on 330.3- and 416.0-keV lines in ${}^{248}\mathrm{Cm}$ fission data.

Figure 7

Experimental and calculated excitation energies in ${}^{149}\mathrm{Pr}$. See text for further explanation.

Figure 8

Total aligned angular momentum in the (7/$2{}^{-}$) band of ${}^{149}\mathrm{Pr}$.