Interpretation of Some Neutron States forA=140−150

Abstract

Nuclear states at 122 and 198 keV are populated in the decay of ${\mathrm{Pm}}^{147}$ to ${\mathrm{Sm}}^{147}$. The 742-keV state of ${\mathrm{Nd}}^{143}$ is reassigned to be $\frac{3}{2}-$. Neutron states of $\frac{3}{2}-$ and $\frac{5}{2}-$ character are traced through the region $A=140\mathrm{}-150$. The $\frac{3}{2}-$ state (the ground state in ${\mathrm{Ce}}^{143}$) is interpreted, for $N=85\mathrm{} \mathrm{and} 87$, as a quasiparticle (qp)-plus-phonon state, predicted by Kisslinger and Sorensen. The $\frac{5}{2}$ state (ground state in ${\mathrm{Nd}}^{147}$) is interpreted as either their qp-plus-phonon state or as a three-qp intruder state. A diagnostic rule for the identification of three-qp states—that their magnetic moments appear in the "wrong" Schmidt group—is discussed and applied to ten cases.