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Octupole correlations in the low-energy collective states of neutron-richnuclei with the neutron number $N\approx56$ are studied within the interactingboson model (IBM) that is based on the nuclear density functional theory. Theconstrained self-consistent mean-field (SCMF) calculations using a universalenergy density functional and a pairing interaction provide the potentialenergy surfaces in terms of the axially-symmetric quadrupole and octupoledeformations for the even-even nuclei $^{86-94}$Se, $^{88-96}$Kr, $^{90-98}$Sr,$^{92-100}$Zr, and $^{94-102}$Mo. The SCMF energy surface is then mapped ontothe energy expectation value of a version of the IBM in the boson condensatestate, which consists of the neutron and proton monopole $s$, quadrupole $d$,and octupole $f$ bosons. This procedure determines the strength parameters ofthe IBM Hamiltonian, which is used to compute relevant spectroscopicproperties. At the SCMF level, no octupole deformed ground state is obtained,while the energy surface is generally soft in the octupole deformation at$N\approx56$. The predicted negative-parity yrast bands with the bandhead state$3^-_1$ weakly depend on $N$ and become lowest in energy at $N=56$ in each ofthe considered isotopic chains. The model further predicts finite electricoctupole transition rates between the lowest negative- and the positive-parityground-state bands.

Octupole correlations in collective excitations of neutron-rich $N\approx56$ nuclei