[en] Short communication

[en] Two data are necessary to determine grass consumption: grass digestibility and excreted feces amount. This amount can be determined by using radioactive lutetium. The first results obtained with radioactive lutetium show daily variations of very high lutetium fecal concentrations and an insufficient and irregular percent of daily recovery. (J.C.)

No abstract available

[en] The collective wobbling mode, the strongest signature for the rotation of a triaxial nucleus, has previously been seen only in a few Lu isotopes in spite of extensive searches in nearby isotopes. A sequence of transitions in the N=94 ¹⁶⁷Ta nucleus exhibiting features similar to those attributed to the wobbling bands in the Lu nuclei has now been found. This band feeds into the πi_13/2 band at a relative energy similar to that seen in the established wobbling bands and its dynamic moment of inertia and alignment properties are nearly identical to the i_13/2 structure over a significant frequency range. Given these characteristics, it is likely that the wobbling mode has been observed for the first time in a nucleus other than Lu, making this collective motion a more general phenomenon.

[en] The s-process nucleosynthesis of the isobar pair ¹⁷⁶Lu/¹⁷⁶Hf, a long-lived cosmic clock, is examined in conjunction with the s-only isotopes /sup 148,150/Sm, ¹⁵⁴Gd, ¹⁶⁰Dy, ¹⁷⁰Yb, ¹⁸⁶Os, and ¹⁹²Pt. Expressions are derived which allow us to calculate the s-process age from measured quantities alone. A formula is specified which does not contain the population probability P to the 3.68 hr isometric state in ¹⁷⁶Lu. This allows us to decide if ¹⁷⁶Lu is, in addition to a cosmic clock, also a stellar thermometer

[en] We discuss some characteristic features of the wobbling motion excited on the triaxial superdeformed Lu and Hf nuclei. We show these features are determined by the behavior of the moments of inertia

[en] In this paper, we discuss the use of Resonance Ionization Mass Spectrometry (RIMS) to perform isotopically selective saturation spectroscopy of lutetium isotopes. Utilizing this technique, it is shown that accurate measurements of the relative frequencies of hyperfine (HF) components for different isotopes easily can be made without the need for an isotopically enriched sample. The precision with which the HF splitting constants can be determined is estimated to be ∼5 times greater than in previous work

[en] A set of quantum numbers describing both precessions of total spin I-vector and single particle spin j-vector is defined by applying boson expansion method to the particle-rotor model with one nucleon coupled to a triaxially deformed core. The derived algebraic energy formula can be applied to classify the triaxial, strongly deformed (TSD) bands in Lu isotopes

[en] Decay widths of nuclear proton emission from neutron-deficient odd-Z nuclei, 51 <= Z <= 71, are computed by the quasistationary model, using Droplet Model potentials and spectroscopic data from shell model considerations. Including the ν half-lives, calculated from the Gross theory of nuclear ν emission, reasonable agreement with the experimentally determined half-lives of ₁₄₇Tm and ₁₅₁Lu is achieved. Predictions of possible new candidates for nuclear proton emission are given. (orig.)

[en] Resonance Ionization Mass Spectrometry (RIMS) is used to yield isotopically selective saturation spectroscopy of the ¹⁷⁵Lu and ¹⁷⁶Lu isotopes. Precise determination of the hyperfine frequency positions for different isotopes is easily achieved. In addition, hyperfine splitting constants can be determined with improved accuracy. (author)