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One of the most interesting features of rotating nuclei is the possibility to study how specific configurations, which show up as collective rotational bands at intermediate spin values, gradually lose their collectivity and terminate in a non-collective state at the maximal spin which can be built within the configuration. The best example of such configurations known at present (in the neutron-d
Rotational cascades observed in neutron-deficient nuclei with Z51 are described as the first examples of smoothly terminating bands in heavy nuclei, since they show a continuous transition from high collectivity to a noncollective state. Excellent agreement between experiment and calculations in the Nilsson-Strutinsky cranking model is obtained for the 51109Sb58 nucleus.
What is the role of deictic gestures in expressing affective valence, and can such gestures serve as an indicator of awareness in choice making? To examine this, we analyzed participants’ deictic gestures toward preferred and non-preferred picture alternatives in an experimental choice justification task. The task involved manipulation: in some trials, participants were presented with the rejected
Based on data obtained with the Eurogam spectrometer, a systematic investigation of superdeformed bands built on single neutron excitations across the N = 86 shell gap has been carried out for gadolinium, terbium, and dysprosium isotopes with 85 ≤ N ≤ 87. In each nucleus, pairs of bands corresponding to degenerate signature partners have been observed. The effective alignment is constant and close
Three rotational bands have been discovered in the nucleus Sb109 that extend in angular momentum to 81/2Latin small letter h with stroke. The rotational frequency at the highest spins reaches Latin small letter h with strokeω1.4 MeV, the highest frequency so far observed in a heavy nucleus. With increasing frequency the collective moments of inertia of all three bands smoothly diminish to unexpect
The competition between collective rotation and single-particle behaviour at high spin in 158Er has been investigated with the Eurogam spectrometer. Band terminating states have been observed in three structures at Iπ = 46+, 48- and 49- and specific single-particle configurations are assigned by comparison with cranked Nilsson-Strutinsky calculations. These special states are found to be related b
Six new rotational bands have been established in I115 at high spin using the near symmetric Ni60(58Ni,3p) reaction at 250 MeV. Several of the bands are observed to frequencies beyond Latin small letter h with stroke=1.0 MeV (spin approaching 50Latin small letter h with stroke). All the bands show a characteristic drop off in their dynamic moments of inertia with increasing spin. The low values at
Previously proposed high spin states in Na22,23 are compared with calculations from the cranked Nilsson model including Strutinsky renormalization. High K rotational isomers are proposed for Iπ=6- in Na22 and 11/2+, 13/2+, and possibly 15/2+ in Na23. The positive parity yrast sequences in these two nuclei are analyzed in terms of the change from collective to single particle behavior at I=9 (22Na)
An enhanced-deformation (ED) rotational band with unusual characteristics has been discovered in the odd-Z nucleus Pr131. The dynamical moment of inertia J(2)=(50-60)Latin small letter h with stroke2 MeV-1 and the extracted quadrupole moment Q0 = 5.5 ± 0.8 eb (β2=0.32±0.05) are comparable with other ED bands (sometimes called ''superdeformed'') in the mass A∼130 region. The two signature partners
Two weakly populated rotational bands have been established in Sn106 from the Fe54 (58Ni,2p) reaction at 243 MeV. One of the bands shows evidence of termination. The result is consistent with cranked Nilsson model calculations, which predict band terminations with a smooth and gradual shape change from a prolate collective to an oblate noncollective structure.
Relative properties of superdeformed bands are exploited in terms of the [effective] alignment of the valence particles. Observed and calculated quantities are compared leading to assignments of configurations and relative spins. Within one formalism, both typical differences between some bands and identity of other bands are understood.
We summarize research reports from 2024 relevant to Tourette syndrome, which the authors consider the most important or interesting. This working draft aims to submit this content for publication around the beginning of 2025 in the yearly Tourette Syndrome Research Highlights series on F1000Research. The authors welcome article suggestions and thoughtful feedback from readers, who can add a commen
The properties of odd-A Xe and Ba nuclides have been compared with calculations based on the Triaxial Rotor plus Particle model. The excitation energies of negative parity states and particularly the signature splitting of yrast states can be reproduced only by assuming triaxial deformation. While the energies of positive parity states are little sensitive to γ, B(E2; 7 21+ → 3 21+) allowed a dete
An atomic beam magnetic resonance (ABMR) apparatus has been constructed at Orsay, and has been installed at the CERN PS Booster ISOLDE mass separator facility for "on-line" work with radioactive isotopes in a program to measure hyperfine structure anomalies (the Bohr-Weisskopf effect) over long isotopic chains. The hfs anomalies result from the effect of the spatial distribution of the nuclear mag
We have used the 8π γ-ray spectrometer at the Chalk River TASCC facility to study superdeformed rotational bands in the chain of isotopes 145-149Gd. The five bands already known have been extended to higher spin, while four new excited bands have been discovered. The use of very similar reactions, data-acquisition parameters and data-analysis techniques, combined with the enlarged set of data, has
The lifetimes of the three lowest excited members of the rotational ground-state band of103Mo at 102.6, 241.1 and 433.2 keV as well as of the levels at 353.8 and 456.1 keV have been determined through a measurement of the delayed coincidences between β particles from the decay of the parent103Nb and the γ rays which depopulate the levels. A plastic and a BaF2 detector have been used for the β and
The rigid triaxial rotor plus particle model (RTRP) was applied to the nucleus 125Xe in order to determine the value of the γ deformation. Two quantities are very sensitive to the γ deformation: the signature splitting of Yrast levels for negative parity levels (h1 1 2) and the lifetime of the (I= 7 2+, K= 7 2) isomer for positive parity lev els. From the two analyses one obtains the same value fo
High-spin states have been observed in the odd-odd isotope 120Cs in 32S-induced reactions. The previously known band is extended to higher spin and several new bands are identified. Band-head configurations have been inferred by comparing the band properties with known bands in the odd nuclei 121Cs and 121Ba. A remarkable signature inversion is observed in the πh 11 2⊗νh 11 2.
The hyperfine anomaly gives an insight into the coupling of spin and orbital magnetic moments in the nucleus. More precisely, the nuclear magnetization is expressible through the nuclear wave functions with which is tested not only the magnetic moment operator, but also the tensor product [s×C2]1. The experiment can then be expected to be of value in testing the nuclear structure theory. The great
In superdeformed, heavy nuclei at low spins, M1 transitions enhanced by internal conversion are expected to compete favorably with E2 rays. For strongly coupled bands with fairly large B(M1) values, the decay may proceed between the two signature partner bands with very few rays emitted. Measured E2 ray intensities may imply strict limits on the M1 strength. Experimental evidence for the M1 cross
