Systematics of Gyromagnetic Ratios of the 21+ States in Even Ge Isotopes

Abstract

The relative gyromagnetic ratios of the 2t states in 70,72,74, 76 Ge were measured simultaneously by means of the thin-foil, perturbed y-ray angular distribution technique utilising the transient hyperfine field manifest at nuclei of Ge ions rapidly traversing polarised Fe. The states of interest were Coulomb excited using 75-MeV 34S projectiles incident upon a natural elemental Ge target. The present results are compared with previously reported measurements and collective model expectations.

First-excited state g factors in the stable, even Ge and Se isotopes

“…Φ y (τ y )/Φ x (τ x ) is therefore sensitive only to the parameter p v , and then only if one of the lifetimes is short compared to the transit time of the ion through the ferromagnetic foil. In the cases en- ) in the Ge isotopes relative to 74 Ge, from present and previous work: 1984Pa20 [30], 1987La20 [31], and 2013Gu23 [7]. Values from Ref.…”

“…The g factors of the first-excited states in the stable, even Ge isotopes have been measured repeatedly by different groups over the years using the ion-implantation perturbed-angular-correlation (IMPAC) [29] and TF [7,30,31] techniques. The most recent measurement performed on the Ge isotopes, by Gürdal et al [7], provided the most precise values yet, with g(2 + 1 ) determined using the TF technique in inverse kinematics and the Rutgers parametrization [26].…”

“…Experimental g factors from Ref. [7] shown in panel a) are their reported weighted-averages that include the previous measurements [30,31] along with their own data. (See also solute' g factors adopted here agree well with the only independent g-factor measurement on 76 Se, and so we proceed to compare these values with theory.…”

“…The g-factor values measured previously by the TF technique are shown in Table IV. For the Ge isotopes, there have been measurements by the Oxford [30], Melbourne [31], and Rutgers [7] groups based on the Rutgers parametrization. Scrutiny of the g( 2 + 1 ; 74 Ge) values, having the smallest relative uncertainty, indicates that the Oxford measurement generally gave a larger magnitude for the 70−76 Ge g factors than obtained in the Melbourne and Rutgers measurements.…”

“…Experimental g factors from Ref. [7] shown in panel a) are their reported weighted-averages that include the previous measurements [30,31] along with their own data. (See also Table IV.)…”