Feeding times of high-spin states in 152, 154Dy: Probes of nuclear structure above the yrast line

Azgui, F.; Emling, H.; Grosse, E.; Michel, C.; Simon, R. S.; Spreng, W.; Wollersheim, H. J.; Khoo, T. L.; Chowdhury, P.; Frekers, D.; Janssens, R. V. F.; Pakkanen, A.; Daly, P.J.; Kortelahti, M.; Schwalm, D.; Seiler-Clark, G.

doi:10.1016/0375-9474(85)90426-9

Cited by 34 publications

(7 citation statements)

References 16 publications

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“…5 a. Similar effects have been observed in neighboring rare earth isotopes [5,6]. For i13/2 neutron alignment and for h11/2 proton alignment the calculations were performed according to [10] (see text).…”

Section: Resultsmentioning

confidence: 73%

Measurement ofg-factors in160Yb by a?-? coincidence technique

Lubkiewicz¹,

Emling²,

Grein³

et al. 1990

Z. Physik A - Atomic Nuclei

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A 7-7 coincidence technique has been developed for g-factor measurements of short-lived nuclear states. The method involves 7-detection in 4~ geometry as well as transient magnetic fields and the recoil-distance technique. A first experiment was performed for the isotope 16~ produced in the reaction 64Ni(l~176 4n) at 430 MeV beam energy. The value g = -0.23 (31) of the 14 + yrast state, which is compatible with zero, establishes the v i13/2 quasiparticle structure to be responsible for the first backbend. A mean g-factor for low spin states around the 4 + state, g = + 0.48 (26) was also derived as well as lifetimes for yrast states up to U = 18 +.

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Section: Resultsmentioning

confidence: 73%

Measurement ofg-factors in160Yb by a?-? coincidence technique

Lubkiewicz¹,

Emling²,

Grein³

et al. 1990

Z. Physik A - Atomic Nuclei

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“…2. the experimental Q t for 154 Dy [15] can be nicely reproduced till I = 8. This was not possible in the projected shell model calculations if axially deformed basis was used [5,6].…”

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confidence: 66%

“…Experimentally, a steady increase of Q t has been observed for the several low-spin states [15] (the drop of Q t at I = 10 is due to the first band-crossing). As can be seen in the top panel of Fig.…”

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confidence: 91%

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Transition quadrupole moments in γ-soft nuclei and the triaxial projected shell model

2001

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Transition probabilities of the ground-state bands in γ-soft nuclei are studied for the first time using the triaxial projected shell model approach. It is observed that the angular-momentum dependence of the transition quadrupole moment Q t is related to the triaxial deformation of the nuclear mean-field potential. The introduction of the γ-degree of freedom in the shell model basis is shown to have a little influence on the constant behavior of the low-spin Q t in a well-deformed nucleus. However, the increasing collectivity with spin for the low-spin states in a γ-soft nucleus can only be explained by considering the triaxial mean-field deformation.The study of the nuclear shape as a function of angular-momentum has remained in the forefront of the nuclear physics research. The study of transition probabilities plays an important role in our understanding of the shape evolution. For instance, probability of the electric quadrupole transition directly reflects the deformation of a nuclear system. For a spherical nucleus, the electric quadrupole transition is of the order of a Weisskopf unit, whereas for a deformed system the transition is several hundred times the Weisskopf estimate [1]. Nuclear deformation is also believed to be one of the most important physical quantities in the astrophysical interest [2]. Many nuclei in nuclear periodic table exhibit axially symmetric deformation in their ground-state, with the projection of angular-momentum on the symmetry-axis as a conserved quantum number. This is referred to as the K-quantum number and the rotational bands are labelled with this quantum-number. In fact, the majority of electromagnetic transitions in nuclei are found to strictly obey the selection rules based on the K quantum-number [1]. The violation of K-selection rules is an indication that the system is not axially symmetric. This has been demonstrated, for example, in high-K isomeric states [3].

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“…Experimental evidence for centrifugal stretching can be obtained from measured lifetimes (e.g. 167,168) or fr om the values of quadrupole moments deduced from Coulomb excitation measurements. In Figure 7, measured transition (Qt) and static (Qd) quadrupole moments are shown as functions of angular momentum for the isotopes 182, 1 84, 186 W (169) .…”

Section: Centrifugal Stretchingmentioning

confidence: 99%