[en] In-beam measurements of magnetic moments of very short-lived nuclear states employing the transient field technique are presented. Particular features of this experimental method relevant for its successful application are discussed. Instead of surveying a large body of data significant details of the capacity of this technique are demonstrated by giving preference to a few selected examples. Particular emphasis is put on high-spin states of deformed nuclei whose structure is dominated by rotationally aligned single particle configurations. (Auth.)

[en] The intense transient magnetic fields have been applied to g-factor measurements of short-lived nuclear states. Significant data for discrete collective high-spin states in ¹⁵⁸Dy and in the actinides ²³²Th and ²³⁸U can be understood by the rotational alignment of valent neutrons and protons, respectively. Measurements on excited states of the self-conjugate nuclei ²⁰Ne and ²⁴Mg are discussed. The controversial small g-factor of the ²⁰Ne(4⁺) state is particularly exciting since it contradicts all present theories. (Auth.)

[en] For high precision measurements of magnetic moments and reduced transition probabilities by the combined technique of projectile Coulomb excitation in inverse kinematics and transient magnetic fields sandwich targets of carbon and gadolinium had to be developed. A Gd layer of 4 mg/cm² was evaporated onto 1-3 mg/cm² Ta backings heated to 800 K for optimum ferromagnetic properties of the Gd. A Cu film of 3.5 mg/cm² was then deposited on the reverse side of the Ta backing. The Cu was required for stopping the Coulomb excited beam ions in a hyperfine interaction-free medium and for cooling the Gd film below its Curie temperature. The sandwich was then completed with 0.5 mg/cm^2natC deposited onto the Gd. The adherence of evaporated carbon on the ferromagnetic gadolinium was found to be poor, and good results were not easily reproduced. Therefore, deposition of carbon by laser plasma ablation was also investigated

[en] The basis ingredients of the transient-field technique to measure g-factors of short-lived nuclear excited states are outlined. The result of recent experiments to determine the g-factors of yrast states in the backbending region of ¹⁵⁸Dy is shown. Then the application of the same technique to g-factor measurements in ²⁰Ne and ²⁴Mg is presented in detail

[en] Transient magnetic fields (TF) of several kilo Tesla in magnitude act on nuclei when swift ions penetrate polarized ferromagnetic solids. Since heavy ion beams have intense ionizing power while going through a magnetic solid, it may cause changes in the magnetic structure thereby reducing its polarization and subsequently attenuating the TF. Comparative measurements of TF were performed in Fe and Gd targets with three different nuclear probes: ²⁴Mg, ²⁸Si and ⁶²Ni. Light and heavy ion beams were applied to produce Coulomb excitation of their first 2⁺stage and to provide ion velocities as similar as possible for each specific probe. In all measurements within 160 MeV Ni ion beams, TF were found to be substantially reduced compared with the results using the lighter O and Si beams with energies of 35 MeV and 130 MeV respectively. The effect was more pronounced in Fe than in Gd. The observations strongly suggest that the heavy Ni beams reduce the magnetization of the ferromagnet and hence the polarization available for the TF at the probe ion. (author)

No abstract available

[en] For high precision measurements of magnetic moments and reduced transition probabilities by the combined technique of projectile Coulomb excitation in inverse kinematics and transient magnetic fields sandwich targets of carbon and gadolinium were required. First preparations revealed a lack of adhesion between the Gd film and the vacuum-deposited C layer. Either the adhesion was generally poor or good results could not be reproduced. Now on a 4 mg/cm² Gd target 0.5 mg/cm² of ^natC should be deposited. The Gd was deposited on 1-1.6 mg/cm² Ta backings and Cu films of 3.5-7 mg/cm² were deposited on the reverse side of the Ta backings. The adhesive properties of evaporated carbon on ferromagnetic gadolinium were investigated. For this either substrate cooling or the deposition of a 5 μg/cm² Ti film as adhesion agent were applied

No abstract available

[en] In view of the puzzlingly small g factor, obtained for the ²⁰Ne(4₁⁺) state in previous measurements, in contradiction to all existing theoretical calculations, we have performed a new set of experiments that rigorously test the former results. Besides employing the same nuclear reaction for populating the nuclear states, new experimental features were introduced to exert strict control on the relevant parameters of the transient magnetic hyperfine field technique. The new result, g(4₁⁺)=+0.38(8), is close to theoretical predictions

[en] The g factor of the 2₁⁺ state in radioactive ⁴⁴Ti has been measured for the first time with the technique of α transfer to ⁴⁰Ca beams in inverse kinematics in combination with transient magnetic fields, yielding the value, g(2₁⁺)=+0.52(15). In addition, the lifetimes of the 2₁⁺, τ=3.97(28) ps, and the 4₁⁺ states, τ=0.65(6) ps, were redetermined with higher precision using the Doppler shift attenuation method. The deduced B(E2)'s and the g factor were well explained by a full fp shell model calculation using the FPD6 effective NN interaction. The g factor can also be accounted for by a simple rotational model (g=Z/A). However, if one also considers the B(E2)'s and the E(4₁⁺)/E(2₁⁺) ratios, then an imperfect vibrator picture gives better agreement with the data