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The 162Dy(α, 2nγ) and 165Ho(p, 2nγ) reactions were used to populate intermediate-spin levels of the rotational side-bands of the N = 96 nucleus 164Er. The β- and γ-bands and two (Kπ = 0− and 2−) octupole vibrational bands were observed from the bandheads at high spin (10–14 ħ). In addition, four two-quasiparticle bands were observed, the v( i 13 2 ) 2 S-band, a Kπ = 4+ band, and two negative-parity bands (Kπ = 5− and 7−). Extensive interactions were observed among the bands of both parities. The S-band crosses the β-, γ-, and g.s. bands while the Kπ = 5− band crosses both octupole bands. Interaction strengths at these crossings are inferred using a two band mixing analysis. The results are discussed in terms of the rotation-alignment picture.

Multiplicities of quasi-continuum γ-rays have been measured for the 160Gd(α, xnγ) reactions as a function of bombarding energy and for the 4n exit channel also as a function of γ-ray energy. Increase of beam energy causes initially an increase of the energy and angular momentum of the entry line in the residual nucleus until the neutron “drip line” is reached. This can be understood in terms of competing compound and precompound processes.