Publisher's Note: New measurement and reevaluation of the nuclear magnetic and quadrupole moments of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Li</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>8</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Li</mml:mi><mml:mprescripts /><mml:none /><mml:mrow>

Borremans, D.; Balabanski, D. L.; Blaum, Klaus; Geithner, W.; Gheysen, Stijn; Himpe, P.; Kowalska, M.; Lassen, J.; Lievens, Peter; Mallion, S.; Neugart, R.; Neyens, G.; Vermeulen, N.; Yordanov, Deyan T.

doi:10.1103/physrevc.72.059902

Cited by 18 publications

(42 citation statements)

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“…The potential of this technique was demonstrated, for example, in Ref. [11,12]. The system is especially important for nuclei with low production rates, small polarization and/or large nuclear spin.…”

Section: Introductionmentioning

confidence: 99%

Fast-switching NMR system for measurements of ground-state quadrupole moments of short-lived nuclei

Minamisono

Weerasiri

Crawford

et al. 2008

Nuclear Instruments and Methods in Physics Research Section A:

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A β-ray detecting nuclear quadrupole resonance system has been developed at NSCL/MSU to measure ground-state electric quadrupole moments of short-lived nuclei produced as fast rare isotope beams. This system enables quick and sequential application of multiple transition frequencies over a wide range. Fast switching between variable capacitors in resonance circuits ensures sufficient power delivery to the coil in the β-ray detecting nuclear magnetic resonance technique. The fast switching technique enhances detection efficiency of resonance signals and is espe- Preprint submitted to Elsevier 3 February 2018cially useful when the polarization and/or production rate of the nucleus of interest are small and when the nuclear spin is large.

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Section: Introductionmentioning

confidence: 99%

Fast-switching NMR system for measurements of ground-state quadrupole moments of short-lived nuclei

Minamisono

Weerasiri

Crawford

et al. 2008

Nuclear Instruments and Methods in Physics Research Section A:

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“…Due to the electric field gradient V zz in such a crystal, in combination with the static magnetic field B, the Zeeman levels of the nuclear spin are shifted by the m I -dependent quadrupole interaction which is proportional to the interaction constant ν Q = eQV zz /h (as illustrated e.g. in [13] for 9 Li) and thus to the nuclear quadrupole moment Q. The frequency ν rf of an additionally applied radio-frequency (rf) magnetic field is scanned over the resonances between adjacent m I quantum states.…”

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confidence: 99%

“…Now, we have reduced this width by an order of magnitude to less than 2 kHz [13], by using a metallic Zn crystal. This also means that less rf power is needed to saturate the resonances.…”

mentioning

confidence: 99%

“…The known magnetic moment µ( 11 Li) = 3.6673 (25) µ N [3] corresponds to an uncertainty of 3.5 kHz on the Larmor frequency of about 5 MHz, but an accuracy much better than the expected line width is needed for a multiple-rf resonance measurement. This is achieved by implanting into a Si crystal [13] where the NMR line width is an order of magnitude smaller than in Au [15] or LiF [3].…”

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confidence: 99%

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Precision Measurement ofLi11Moments: Influence of Halo Neutrons on theLi9Core

et al. 2008

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The electric quadrupole moment and the magnetic moment of the 11 Li halo nucleus have been measured with more than an order of magnitude higher precision than before, |Q| = 33.3(5) mb and µ = 3.6712(3) µN , revealing a 8.8(1.5)% increase of the quadrupole moment relative to that of 9 Li. This result is compared to various models that aim at describing the halo properties. In the shell model an increased quadrupole moment points to a significant occupation of the 1d orbits, whereas in a simple halo picture this can be explained by relating the quadrupole moments of the proton distribution to the charge radii. Advanced models so far fail to reproduce simultaneously the trends observed in the radii and quadrupole moments of the lithium isotopes.PACS numbers: 21.10. Ky, 27.30.+t, 21.60.Cs Since nuclear physicists could produce and investigate bound systems of nucleons in many possible combinations, a wealth of isotopes with unexpected properties have been discovered. For example, some neutron-rich isotopes of light elements, such as 11 Li, were found to have exceptionally large radii [1]. Upon discovery in 1985, this phenomenon was attributed to either large deformation or to a long tail in the matter distribution [2]. Deformation was soon excluded by the spin and magnetic moment of 11 Li belonging to a spherical πp 3/2 state [3]. Considering the weak binding of the last two neutrons [4], one could conclude that such a nuclear system consists of a core with two loosely bound neutrons around it [5]. This is the concept of 'halo' nuclei which has been related to similar phenomena in atomic and molecular physics [6], showing the universality of the concept. To fully unravel the mechanisms leading to the existence of halo nuclei, many types of experiments have been devoted to the investigation of their properties. An observable that gives information on the nuclear charge deformation is the spectroscopic quadrupole moment. By comparing the quadrupole moment of 11 Li to that of 9 Li, one can investigate how the two halo neutrons modify the deformation of the core which contains the three protons. Already fifteen years ago, a first attempt to do so giving Q( 11 Li)/Q( 9 Li) = 1.14(16), suggested just a slight increase in agreement with the halo concept [7]. Unbiasedly, for a nucleus with a neutron magic number of N = 8 one would expect a minimum value of the quadrupole such as for 13 B [8]. If 11 Li has a larger quadrupole moment than 9 Li, it can not be considered as semi-magic, and the two halo neutrons have to be responsible for an expansion or polarization of the proton distribution in the core. The latter, in terms of the shell model, must be understood by an excitation of halo neutrons to the 1d orbits, and a precise value of the 11 Li quadrupole moment may provide evidence for this. The effect of a more extended charge distribution can be estimated on the basis of a recent laser spectroscopy measurement of the charge radius [9]. The increase of the charge radius for 11 Li, as well as other properties of Li isoto...

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“…The results could be used to exclude a possible deformation of 11 Li because the spin 3/2 belongs to a spherical state, the magnetic moment lies close to the Schmidt value, and the quadrupole moment is similar to that of 9 Li. Both these values, which were improved recently [13,14], again indicate that the nucleus is nearly spherical.…”

Section: Introductionmentioning

confidence: 87%

Isotope shift measurements in the 2s_1/2→ 2p_3/2transition of Be⁺and extraction of the nuclear charge radii for^{7, 10, 11}Be

Žáková

Andjelkovic

Bissell

et al. 2010

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

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Abstract. We have performed isotope shift measurements in the 2s 1/2 → 2p 3/2 transition of Be + ions using advanced collinear laser spectroscopy with two counterpropagating laser beams. Measurements involving a frequency comb for laser stabilization and absolute frequency determination allowed us to determine the isotope shifts with an accuracy of 2 MHz. From the isotope shifts between 9 Be and 7,10,11 Be, high-accuracy mass shift calculations and the charge radius of the reference isotope 9 Be we determined nuclear charge radii for the isotopes 7,10 Be and the one-neutron halo nucleus 11 Be. The results are compared to nuclear-structure calculations using the Fermionic Molecular Dynamics model which reproduce well the general trend of the radii. Decreasing charge radii from 7 Be to 10 Be are explained by the cluster structure of the nuclei. The increase from 10 Be to 11 Be is mainly caused by the halo neutron by which the 10 Be core moves relative to the center of mass. Polarization of the 10 Be core has only a small influence on the charge radius.

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Publisher's Note: New measurement and reevaluation of the nuclear magnetic and quadrupole moments ofLi8andLi

Cited by 18 publications

References 0 publications

Fast-switching NMR system for measurements of ground-state quadrupole moments of short-lived nuclei

Fast-switching NMR system for measurements of ground-state quadrupole moments of short-lived nuclei

Precision Measurement ofLi11Moments: Influence of Halo Neutrons on theLi9Core

Isotope shift measurements in the 2s_1/2→ 2p_3/2transition of Be⁺and extraction of the nuclear charge radii for^{7, 10, 11}Be

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Publisher's Note: New measurement and reevaluation of the nuclear magnetic and quadrupole moments ofLi8andLi

Cited by 18 publications

References 0 publications

Fast-switching NMR system for measurements of ground-state quadrupole moments of short-lived nuclei

Fast-switching NMR system for measurements of ground-state quadrupole moments of short-lived nuclei

Precision Measurement ofLi11Moments: Influence of Halo Neutrons on theLi9Core

Isotope shift measurements in the 2s1/2→ 2p3/2transition of Be+and extraction of the nuclear charge radii for7, 10, 11Be

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Product

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Isotope shift measurements in the 2s_1/2→ 2p_3/2transition of Be⁺and extraction of the nuclear charge radii for^{7, 10, 11}Be