Charge Radii of Argon Isotopes in the f7/2 Shell and Radii Systematics in the Ca-Region

Blaum, Klaus; Geithner, W.; Lassen, J.; Lievens, Peter; Marinova, K. P.; Neugart, R.

doi:10.1007/3-540-30926-8_12

Cited by 3 publications

(4 citation statements)

References 13 publications

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“…While the theoretical S Z curves for K are mostly flat and therefore do not present a significant curvature of the mean-square 520 charge radii in this region, the experimental K and Ca mean-square charge radii show a parabolic trend resulting in a negative curvature. This behavior is especially striking in the Ca isotopic chain, where 40 Ca and 48 Ca have approximately the same charge radii, which is at-525 tributed to quadrupole core polarization effects [45], and has been discussed previously for the Ar isotopes [3,4]. The amplitude of the parabola for the K isotopes is smaller than that of Ca, but the negative curvature is not reproduced by theory.…”

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confidence: 77%

“…While there is a clear discontinuity in the charge radii, for example, at the N = 28 neutron-shell closure for the iso- 35 topic chains of K through Mn, the signature at N = 20 is absent in the Ca region. The mean-square charge radii of the Ar [3,4], K [5][6][7][8][9] and Ca [10][11][12] isotopic chains vary monotonically across N = 20 in contrast to the discontinuity evident at N = 28. The absence of an unambigu- 40 ous signature of the shell effect has been attributed to the cancellation of the monopole and quadrupole proton core polarizations under successive neutron addition [3], but a quantitative description of this phenomenon has not been provided yet.…”

Section: Introductionmentioning

confidence: 99%

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Charge radii of neutron-deficientK36andK37

et al. 2015

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Background: The systematic trend in mean-square charge radii as a function of proton or neutron number exhibits a discontinuity at the nucleon-shell closures. While the established N = 28 shell closure is evident in the 10 charge radii of the isotopic chains of K through Mn, a similar signature of the N = 20 shell-closure is absent in the Ca region.Purpose: The isotope shift between neutron-deficient 36 K and 37 K was determined to investigate the change of the mean-square charge radii across N = 20 in the K isotopic chain.Methods: The D1 atomic hyperfine spectra of 36 K and 37 K were measured using an optical pumping and 15 subsequent β-decay asymmetry detection technique. Atomic rate equations were solved to fit the resonant line shape. The result was compared to Skyrme energy-density functional and shell-model calculations.Results: The isotope shift was obtained as δν 37,36 = −139(4)(3) MHz. Using a re-evaluated isotope shift, δν 39,37 = −264(2)(3) MHz, the isotope shift relative to 39 K was determined to be δν 39,36 = −403(5)(4) MHz. The differential mean-square charge radius was then deduced as δ r 2 39,36 = −0.16 (5)(8) Conclusions:The absence of the shell-closure signature at N = 20 in the K isotopic chain is understood as a balance between the monopole and the quadrupole proton-core polarizations below and above N = 20, respectively.

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confidence: 77%

Section: Introductionmentioning

confidence: 99%

Charge radii of neutron-deficientK36andK37

et al. 2015

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“…This is shown in a comparison of the present data on scandium isotopes with the known development of radii for Ca [17] and Ti [13] (see Fig. 2) and can be seen as well in comparison with the more extensive systematics of [2] Table 3 Energies and intrinsic quadrupole moments of the isomeric states derived from the experimental B(E2) values for the I p ¼ 3=2 þ bands and averaged over the different rotational transitions -according to [17] …”

Section: Discussionmentioning

confidence: 89%

Nuclear charge radii and electromagnetic moments of scandium isotopes and isomers in the f7/2 shell

et al. 2006

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Collinear laser spectroscopy experiments on the ScII transition 3d4s 3 D 2 →3d4p 3 F 3 at λ≈363.1 nm were performed on the 42-46 Sc isotopic chain using an ion guide isotope separator with a cooler-buncher. Isotope and isomer shifts and hyperfine structures of five ground states and two isomers were measured. Preliminary results on the nuclear moments and charge radii changes deduced from these measurements are reported.Key words collinear laser spectroscopy . cooled and bunched ion beam . isotope shifts and hyperfine structure of 42-46 Sc . nuclear moments and charge radii in f 7/2 neutron shell 1 Introduction

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“…Accurate knowledge of Q values of these isotopes are useful in many applications. These information are interesting in order to test the potential of nuclear models [14,15], acquiring information about local symmetry [16], to find out asymmetry parameters in nuclei [17,18], for studying the Mossbauer spectroscopy for the structural determination of the element containing solid state compounds [19] etc.…”

Section: Introductionmentioning

confidence: 99%

Revisiting Nuclear Quadrupole Moments in $^{39-41}$K Isotopes

Singh,

Nandy,

Sahoo

2012

Preprint

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Nuclear quadrupole moments (Qs) in three isotopes of potassium (K) with atomic mass numbers 39, 40 and 41 are evaluated more precisely in this work. The Q value of 39 K is determined to be 0.0614(6) b by combining the available experimental result of the electric quadrupole hyperfine structure constant (B) with our calculated B/Q result of its 4P 3/2 state. Furthermore combining this Q value with the measured ratios Q( 40 K)/Q( 39 K) and Q( 41 K)/Q( 39 K), we obtain Q( 40 K)= −0.0764(10) b and Q( 41 K)= 0.0747(10) b, respectively. These results disagree with the recently quoted standard values in the nuclear data table within the given uncertainties. The calculations are carried out by employing the relativistic coupled-cluster theory at the singles, doubles and involving important valence triples approximation. The accuracies of the calculated B/Q results can be viewed on the basis of comparison between our calculated magnetic dipole hyperfine structure constants (As) with their corresponding measurements for many low-lying states. Both A and B results in few more excited states are presented for the first time.

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Charge Radii of Argon Isotopes in the f7/2 Shell and Radii Systematics in the Ca-Region

Cited by 3 publications

References 13 publications

Charge radii of neutron-deficientK36andK37

Charge radii of neutron-deficientK36andK37

Nuclear charge radii and electromagnetic moments of scandium isotopes and isomers in the f7/2 shell

Revisiting Nuclear Quadrupole Moments in $^{39-41}$K Isotopes

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