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The structure of the $N \approx Z$ nuclei $^{66}$Ge and $^{68}$Ge is studiedby the shell model on a spherical basis. The calculations with an extended$P+QQ$ Hamiltonian in the configuration space  ($2p_{3/2}$, $1f_{5/2}$, $2p_{1/2}$, $1g_{9/2}$) succeed in reproducingexperimental energy levels, moments of inertia and $Q$ moments in Ge isotopes.Using the reliable wave functions, this paper investigates particle alignmentsand nuclear shapes in $^{66}$Ge and $^{68}$Ge.  It is shown that structural changes in the four sequences of the positive-and negative-parity yrast states with even $J$ and odd $J$ are caused byvarious types of particle alignments in the $g_{9/2}$ orbit.  The nuclear shape is investigated by calculating spectroscopic $Q$ moments ofthe first and second $2^+$ states, and moreover the triaxiality is examined bythe constrained Hatree-Fock method.  The changes of the first band crossing and the nuclear deformation dependingon the neutron number are discussed.Comment: 18 pages, 21 figures; submitted to Phys. Rev.

physical review. c. nuclear physics/physical review. c, nuclear physics

Particle alignments and shape change in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Ge</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>66</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Ge</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>68</mml:mn></mml:mrow></mml:…

Particle alignments and shape change inGe66andGe68