Nuclear ground state properties of 99Sr by collinear laser spectroscopy with non-optical detection

Lievens, Peter; Silverans, Roger; Vermeeren, L.; Borchers, W.; Neu, W.; Neugart, R.; Wendt, Κ.; Buchinger, F.; Arnold, E.

doi:10.1016/0370-2693(91)90664-c

Cited by 44 publications

(27 citation statements)

References 12 publications

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“…CM motion blurs the proton distribution and leads to a rather large charge radius. The stable 9 Be has an n a a + + structure and is less extended than 7 Be due to the compactness of the α particles and the binding strength of the additional neutron. This effect is even enhanced with the second neutron added in 10 Be.…”

Section: New Methods and Highlights Since 2000mentioning

confidence: 99%

“…This is visualised in a very simplified picture in the small panels below the graph. The lightest isotope 7 Be can be regarded as a two-body cluster He 3 a + . CM motion blurs the proton distribution and leads to a rather large charge radius.…”

Section: New Methods and Highlights Since 2000mentioning

confidence: 99%

“…These particle/radiation detection techniques require each a dedicated experimental setup at the collinear beam line, and each technique is only applicable on particular elements or isotopes. For example, optical pumping of neutral atoms, detected by state-selective collisional ionisation [6] and optical pumping of singly-charged ions, detected by state-selective neutralisation [7,8] are suitable techniques for the noble gasses (e.g. Ar isotopes) and alkaline earth elements (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Collinear laser spectroscopy at ISOLDE: new methods and highlights

Neugart

Billowes

Bissell

et al. 2017

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

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Over three and a half decades of collinear laser spectroscopy and the COL-LAPS setup have played a major role in the ISOLDE physics programme. Based on a general experimental principle and diverse approaches towards higher sensitivity, it has provided unique access to basic nuclear properties such as spins, magnetic moments and electric quadrupole moments as well as isotopic variations of nuclear mean square charge radii. While previous methods of outstanding sensitivity were restricted to selected chemical elements with special atomic properties or nuclear decay modes, recent developments have yielded a breakthrough in sensitivity for nuclides in wide mass ranges. These developments include the use of bunched beams from the radiofrequency quadrupole cooler-buncher ISCOOL, which allows a suppression of background by several orders of magnitude. Very recently, the combination of collinear laser spectroscopy with the principle of laser resonance ionisation took shape in the new CRIS setup, providing a very selective and efficient detection of optical resonance. We outline the basic experimental developments and discuss important results on nuclei or chains of isotopes in different mass ranges.

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Section: New Methods and Highlights Since 2000mentioning

confidence: 99%

Section: New Methods and Highlights Since 2000mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Collinear laser spectroscopy at ISOLDE: new methods and highlights

Neugart

Billowes

Bissell

et al. 2017

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

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“…The rapid transition from a spherical shape around the N = 50 shell closure to such a strong deformation re ects the reinforcement of several shell gaps in the single particle spectrum (see 4,5] and references therein). Laser spectroscopy experiments on rubidium 6,7] and strontium 8,9,10,11,12] yielded the spins, moments and changes in mean square charge radii hr 2 i for sequences of isotopes covering the neutron shell closure and both regions of deformation. These results provide a rather coherent description of the changes in nuclear structure as a function of the neutron number.…”

Section: Introductionmentioning

confidence: 99%

Laser-spectroscopy measurements of 72–96Kr spins, moments and charge radii

Keim¹,

Arnold²,

Borchers³

et al. 1995

Nuclear Physics A

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129

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“…(Bottom panel) Difference in mean-square charge radii for the N ¼ 60 region. Data are from [28] for Kr, [39] for Rb, [40,41] for Sr, [29] for Y, [30] for Zr, [31] for Nb, and [32] for Mo. third, algebraic method (i.e., with no a priori assumption on the distribution shape).…”

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confidence: 99%

Critical-Point Boundary for the Nuclear Quantum Phase Transition NearA=100from Mass Measurements ofKr96,97

et al. 2010

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Mass measurements of 96;97 Kr using the ISOLTRAP Penning-trap spectrometer at CERN-ISOLDE are reported, extending the mass surface beyond N ¼ 60 for Z ¼ 36. These new results show behavior in sharp contrast to the heavier neighbors where a sudden and intense deformation is present. We interpret this as the establishment of a nuclear quantum phase transition critical-point boundary. The new masses confirm findings from nuclear mean-square charge-radius measurements up to N ¼ 60 but are at variance with conclusions from recent gamma-ray spectroscopy. DOI: 10.1103/PhysRevLett.105.032502 PACS numbers: 21.10.Dr, 64.70.Tg, 74.40.Kb Dynamical symmetries are an enlightening paradigm for describing the stucture of matter. Iachello and Arima have elegantly described the application of dynamic symmetries in nuclear physics by developing the Interacting Boson Model (IBM) [1]. The IBM allowed the classification of nuclear spectra in terms of U(6) group theory and predicted the occurrence of three dynamical symmetries: U(5), SU(3), and SO(6) [2]. More recent attempts to enlarge these concepts have resulted in the elaboration of criticalpoint symmetries, notably for nuclear shapes [3,4]. These are particularly interesting since they apply to interactions that are discontinuous and describe phenomena in terms of quantum phase transitions. Whereas classical phase transitions follow changes in temperature and pressure, the quantum phase transitions of nuclear shapes occur when neutrons and protons change their orbit occupation in the nucleus.The IBM formalism describes the ground-state band of a deformed nucleus and in the pure SU (3) Linking the atomic nucleus with dilute gases of ultracold atoms thus offers interesting possibilities for furthering our understanding of nuclear structure. Indeed, the ideas of phase transitions and condensates have been extended to fermionic matter in the form of an -particle condensation [6], which has profound implications in nucleosynthesis. Another example is the description of halo nuclides, where the alpha phase transition is favored over pairing in the dilute nuclear halo [7]-a striking parallel to Bose-Einstein condensates in dilute gases.Nuclear quantum phase transitions are linked to groundstate binding energies within the framework of the IBM [1] (for more detailed discussion in the experimental context, see also [8][9][10]). The ground-state binding energy reflects the net result of all interactions at work in the nucleus and its minimization is decisive for the occupational sequence of the nuclear orbitals. As such, nuclear deformation is highly visible from deep indentations of the mass surface. These features are the manifestations of a first-order quantum phase transition with the critical points defining where the phase transition starts and where it ends [11].In this Letter, we report new mass measurements in the Z ¼ 40 and N ¼ 60 region of the nuclear chart, where one of the most remarkable examples of nuclear shape transition (both for its intensity and its suddenness) is ...

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Nuclear ground state properties of 99Sr by collinear laser spectroscopy with non-optical detection

Cited by 44 publications

References 12 publications

Collinear laser spectroscopy at ISOLDE: new methods and highlights

Collinear laser spectroscopy at ISOLDE: new methods and highlights

Laser-spectroscopy measurements of 72–96Kr spins, moments and charge radii

Critical-Point Boundary for the Nuclear Quantum Phase Transition NearA=100from Mass Measurements ofKr96,97

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