Level mixing spectroscopy

Hardeman, F.; Scheveneels, G.; Neyens, G.; Nouwen, R.; S’heeren, G.; Bergh, M. van den; Coussement, R.

doi:10.1103/physrevc.43.130

Cited by 31 publications

(20 citation statements)

References 9 publications

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“…They were in-beam implanted into a thick Tl polycrystalline foil, which served as a levelmixing spectroscopy (LEMS) host and as a beam stopper. The experiments were performed at the CYCLONE cyclotron at Louvain-la-Neuve, using the LEMS technique [11][12][13]. The experimental setup consists of a split-coil 4.4 T superconducting magnet, a target holder, allowing precise temperature control at the target position in the interval 4 -600 K, and 4 Ge detectors, which monitor the target through the holes of the magnet.…”

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confidence: 99%

“…The experimental setup consists of a split-coil 4.4 T superconducting magnet, a target holder, allowing precise temperature control at the target position in the interval 4 -600 K, and 4 Ge detectors, which monitor the target through the holes of the magnet. They are positioned at 0 ± and 90 ± with respect to the beam axis [11]. The magnetic field was oriented parallel to the beam axis.…”

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confidence: 99%

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Static Quadrupole Moment of the Five-QuasiparticleK=352Isomer inW1

Balabanski

Vyvey²,

Neyens³

et al. 2001

Phys. Rev. Lett.

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The spectroscopic quadrupole moment of the high-spin, high- K five-quasiparticle isomer (K(pi) = 35/2(-), T(1/2) = 750(80) ns, E(i) = 3349 keV) in (179)W has been determined using the level mixing spectroscopy method. A value Q(s) = 4.00(+0.83-1.06)e b was derived, which corresponds to an intrinsic quadrupole moment Q0 = 4.73(+0.98-1.25)e b and to a quadrupole deformation beta(2) = 0.185(+0.038-0.049). These values differ significantly from the deduced ground-state quadrupole moments and are in disagreement with the current theoretical predictions in this mass region.

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confidence: 99%

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confidence: 99%

Static Quadrupole Moment of the Five-QuasiparticleK=352Isomer inW1

Balabanski

Vyvey²,

Neyens³

et al. 2001

Phys. Rev. Lett.

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“…This is easier said than done, however. There are a number of methods to measure the deformation of the ground state in unstable nuclei based on the interaction of the electric quadrupole moment of the nucleus with an external electric field gradient [8,9]. These techniques are not applicable to nuclei with J=0 or 1/2, moreover they very seldom give the sign of the quadrupole moment and hence cannot distinguish between oblate and prolate shapes.…”

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Deformation of theN=ZNucleusSr76usingβ-Decay Studies

et al. 2004

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A novel method of deducing the deformation of the N=Z nucleus 76 Sr is presented. It is based on the comparison of the experimental Gamow-Teller strength distribution B(GT) from its β-decay with the results of QRPA calculations. This method confirms previous indications of the strong prolate deformation of this nucleus in a totally independent way. The measurement has been carried out with a large Total Absorption gamma Spectrometer, "Lucrecia", newly installed at CERN-ISOLDE.PACS numbers: 21.10. Pc, 23.40.Hc, 27.50.+e, 29.30.Kv, 29.40.Mc The shape of the atomic nucleus is conceptually one of the simplest of its macroscopic properties to visualise. However, it turns out to be one of the more difficult properties to measure. In general terms we now have a picture of how the nuclear shape varies across the Segrè Chart. Nuclei near to the closed shells are spherical. In contrast nuclei with the valence nucleons in between two shells have deformed shapes with axial symmetry and the extent of the quadrupole deformation is quite well described as being proportional to the product N p N n of the numbers of pairs of valence protons (N p ) and neutrons (N n ) [1]. This picture is underpinned by both the Shell and Mean Field models of nuclear structure. Experiment and theory concur that, as the N p N n parameterisation would suggest, nuclei rapidly deform as we add only a small number of valence nucleons to the magic numbers. Thus nuclei in the middle of the f 7/2 shell turn out to be deformed even although the numbers of valence nucleons are relatively small.Experimentally this picture is supported by a mass of independent observations: the strongly enhanced quadrupole transition rates between low-lying states, the strongly developed rotational bands built on low-lying states, and measurements of ground state quadrupole moments. Where we have evidence of the shapes of ground and excited states in the same nucleus they are, in general but not always, the same. It turns out that in some cases nuclear states with different shapes co-exist in the same nucleus [2].The nuclei with N≈Z and A≈70-80 are of particular interest in this context. Such nuclei enjoy a particular symmetry since the neutrons and protons are filling the same orbits. This, and the low single-particle level density, lead to rapid changes in deformation with the addition or subtraction of only a few nucleons. In terms of Mean Field models these rapid changes arise because of the proximity in energy of large energy gaps for protons and neutrons at Z,N=34 and 36 on the oblate and Z,N=38 on the prolate side of the Nilsson diagram. As a result Mean Field calculations predict the existence of several energy minima with quite different shapes in some of these nuclei [3,4]. Evidence of this co-existence has been found for instance in Se and Kr nuclei [5,6], and it is also predicted for the lightest Sr isotopes [7]. Thus it is of considerable interest to map out the deformation of the ground and excited states of nuclei in this region. This is easier said than do...

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“…A number of methods of determining the ground state deformation in unstable nuclei do exist. They are based on the interaction of the electric quadrupole moment of the nucleus with an external electric field gradient [45][46][47]. However they do not apply to nuclei with I = 0 or 1/2, thus ruling out experiments on even-even nuclei and they do not give the sign of the quadrupole moment and so cannot distinguish between oblate and prolate shapes.…”

Section: The Measurement Of Nuclear Shapes In Beta Decay; N ∼ Z Nucleimentioning

confidence: 99%

Beta decay studies with total absorption spectroscopy and theLucreciaspectrometer at ISOLDE

Rubio

Gelletly

Algora

et al. 2017

J. Phys. G: Nucl. Part. Phys.

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Beta decay studies with the total absorption technique B Rubio, W Gelletly, E Nácher et al.Towards detailed knowledge of atomic nuclei -the past, present and future of nuclear structure investigations at GSI J Gerl, M Grska and H J Wollersheim Beta decay studies with total absorption spectroscopy and the Lucrecia spectrometer at ISOLDE Here we present the experimental activities carried out at ISOLDE with the total absorption spectrometer Lucrecia, a large 4π scintillator detector designed to absorb a full gamma cascade following beta decay. This spectrometer is designed to measure β-feeding to excited states without the systematic error called Pandemonium. The set up allows the measurement of decays of very short half life. Experimental results from several campaigns, that focus on the determination of the shapes of β-decaying nuclei by measuring their β decay strength distributions as a function of excitation energy in the daughter nucleus, are presented.

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Level mixing spectroscopy

Cited by 31 publications

References 9 publications

Static Quadrupole Moment of the Five-QuasiparticleK=352Isomer inW1

Static Quadrupole Moment of the Five-QuasiparticleK=352Isomer inW1

Deformation of theN=ZNucleusSr76usingβ-Decay Studies

Beta decay studies with total absorption spectroscopy and theLucreciaspectrometer at ISOLDE

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