Nuclear structure investigations of the Ge isotopes by means of (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo>,</mml:mo><mml:mi> </mml:mi><mml:mi>t</mml:mi></mml:math>) reactions and microscopic studies of nuclear deformations and collective spectra

Abstract

Systematics are presented from our study of the Ge nuclei by means of the ($p, t$) reaction. From observed intensities and excitation energies, conclusions are drawn concerning structure and reaction mechanisms. They are discussed in the frame of microscopic calculations. These calculations predict a shape transition from a nearly spherical nucleus ($^{70}\mathrm{Ge}$) to a slightly oblate one ($^{74}\mathrm{Ge}$). The energies of the low-lying 0+ levels are well fitted; dynamical effects induced by pairing fluctuations are shown to play a major role in this feature as well as in the striking evolution of their intensitie in the ($p, t$) reaction. A connection is presented with the possibility of 0+ pairing isomer states. The outstanding splitting of the $L=3$ strength at $N=42$ appears as a characteristic feature of this region suggesting coupling effects in octupole modes.NUCLEAR REACTIONS $^{70,72,74,76}\mathrm{Ge}(p, t)$, deduced and presented systematics about nuclear structure and reaction mechanisms.NUCLEAR STRUCTURE $^{70,72,74,78}\mathrm{Ge}$; calculated deformation energy curves and collective spectra. Used microscopic theory. Compared with experimental systematics.