Identification of levels in $^{159}$Sm and high spin states in $^{157}$Sm and $^{89,91}$Kr

The high spin excited states of neutron-rich nuclei $^{157,159} $Sm and $^{89,91}$Kr were identified for the first time from the spontaneous fission of $^{252}$Cf. Six excited states and six gamma transitions in $^{159}$Sm are reported here for the first time. Four, five, and two new gamma transitions were identified in $^{157}$Sm, $^{89}$Kr, and $^{91}$Kr, respectively. Level schemes in $^{89,91}$Kr are interpreted as the 2d$_{5/2}$ neutron hole configuration weakly coupled to the neighboring even-even Kr nuclei. Yrast spin sequences of 11/2$^-$ - 9/2$^+$ - 5/2$^+$ is observed in $^{89,91}$Kr. Rotational bands are identified in $^{157}$Sm and $^{159}$Sm with the proposed configurations of $\nu$5/2[523] and $\nu$3/2[521], respectively.