Nuclear moments of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Li</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>9</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Correll, F. D.; Madansky, L.; Hardekopf, R.A.; Sunier, J. W.

doi:10.1103/physrevc.28.862

Cited by 21 publications

(13 citation statements)

References 45 publications

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“…Consistent values for the 8 Li magnetic moment have been reported [6,26,28], with the most precise numbers given by Winnacker et al [6]. Here we use the value adopted in the compilation of Raghavan [7], µ = +1.653560 (18) µ N , corresponding to g = 0.826780(9), for deducing the g factor of 9 Li. 1 Both isotopes, 8 Li and 9 Li, were implanted alternately in the Si crystal, and for each of them more than 15 resonances were measured in each of the two runs.…”

Section: B Magnetic Moment Of 9 LImentioning

confidence: 71%

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New measurement and reevaluation of the nuclear magnetic andquadrupole moments ofLi8andLi9<

et al. 2005

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The nuclear magnetic moment of 9 Li and the quadrupole moments of 8 Li and 9 Li have been measured by use of the β-asymmetry detection of nuclear magnetic resonance on optically polarized beams at ISOLDE/CERN. The radioactive beams were implanted in Si for g-factor measurements and in Zn, LiNbO 3 , and LiTaO 3 crystals for quadrupole moment measurements. The electric-field gradient V zz = 4.26(4) × 10 15 V/cm 2 is deduced for Li in Zn. Using a recently adopted reference value, Q( 7 Li) = −40.0(3) mb, we reevaluated all earlier reported nuclear quadrupole moments of 8 Li and 9 Li. Based on all available previous and present data, the adopted quadrupole moments for these isotopes are Q( 8 Li) = +31.4(2) mb and Q( 9 Li) = −30.6(2) mb. The magnetic moment of 9 Li is deduced as µ( 9 Li) = 3.43678(6)µ N . The values are compared with predictions from shell-model and cluster-model calculations.

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Section: B Magnetic Moment Of 9 LImentioning

confidence: 71%

“…For 9 Li, earlier measurements were performed only in LiNbO 3 crystals [13,18], and the data do not agree very well with each other. In the present work, the quadrupole moment of 9 Li is measured relative to that of 8 Li in crystals of Zn and LiTaO 3 .…”

Section: Introductionmentioning

confidence: 82%

New measurement and reevaluation of the nuclear magnetic andquadrupole moments ofLi8andLi9<

et al. 2005

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“…Results from the three runs are presented in Fig. 3, with the weighted mean of |Q( 11 Li)/Q( 9 Li)| = 1.088 (15). Thus the quadrupole moment of the halo nucleus, |Q( 11 Li)| = 33.3(5) mb, with a negative sign from theoretical considerations, is nearly 10% larger than that of bare 9 Li.…”

mentioning

confidence: 93%

“…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%

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 second-order process involving QJ1t is referred to as the reorientation effect. Its theory and application have been comprehensively described by de Boer and Eichler (1968), Hausser (1974) and Alder and Winther (1975). Typical experiments have involved Coulomb excitation of the 2+ first excited state of a doubly even nucleus; since the ground state has J1t = 0+, and hence a static quadrupole moment of zero, two independent measurements of the excitation probability suffice to determine B(E2;0+~2+) and Q2+.…”

Section: Introductionmentioning

confidence: 99%

Coulomb Excitation of 7Li

Vermeer¹,

Baxter²,

Burnett³

et al. 1984

Aust. J. Phys.

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Coulomb excitation of the 0·478 MeV, J1t = t-, first excited state of 7Li has been studied using beams of 7Li ions and targets of 13 8Ba and 208Pb. Spectra of the scattered particles were measured at 171°using an annular Si surface-barrier detector (l 38 Ba and 208Pb targets) and at 90°using an Enge split-pole magnetic spectrometer (208Pb targets). For each experimental configuration, the bombarding energy at which nuclear interference became significant was determined experimentally. An analysis based upon the reorientation effect yielded the following results: the static electric quadrupole moment of the J1t = t-ground state (Q3/2-) is -4·0± 1·1 efm", the contribution of the giant dipole resonance (GDR) to the Coulomb-excitation cross section is 2·7 ±0·2 times as great as would be calculated from the hydrodynamic model, and B(E2;t-~t-) is 7·42±0·14e 2fm4 •The value obtained for Q3/2-is in excellent agreement with results reported from atomic-and molecular-beam spectroscopy and from Coulomb scattering of aligned 7Li. Thus it provides a strong verification of the validity of the reorientation-effect technique for the determination of nuclear quadrupole moments, provided that the GDR effect is treated adequately.

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Nuclear moments ofLi9

Cited by 21 publications

References 45 publications

New measurement and reevaluation of the nuclear magnetic andquadrupole moments ofLi8andLi9<

New measurement and reevaluation of the nuclear magnetic andquadrupole moments ofLi8andLi9<

Precision Measurement ofLi11Moments: Influence of Halo Neutrons on theLi9Core

Coulomb Excitation of 7Li

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