Quadrupole moments of odd-A 53−63 Mn: Onset of collectivity towards N = 40

Babcock, C.; Heylen, H.; Bissell, M. L.; Blaum, Klaus; Campbell, P.; Cheal, B.; Fedorov, D. V.; Ruiz, R. F. Garcia; Geithner, W.; Gins, W.; Goodacre, T. Day; Grob, L. K.; Kowalska, Magdalena; Lenzi, S. M.; Maaß, B.; Malbrunot-Ettenauer, S.; Marsh, B. A.; Neugart, R.; Neyens, G.; Nörtershäuser, W.; Otsuka, Takaharu; Rossel, R. E.; Rothe, S.; Sánchez, R.; Tsunoda, Y.; Wraith, C.; Xie, Liang; Yang, Xiaofei

doi:10.1016/j.physletb.2016.07.016

Cited by 27 publications

(25 citation statements)

References 31 publications

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“…All odd-A Mn isotopes, except for 53 Mn at N=28, have a ground state spin/parity 5/2 − , that deviates from the expected 7/2 − : this is a first signature for the non-spherical nature of these isotopes. A comparison of the magnetic and quadrupole moments with large scale shell model calculations in different model spaces shows that proton excitation across Z=28 as well as neutron excitation across N=40 and N=50 (into the g 9 2 and d 5 2 orbits) are needed to reproduce the observed values from N=36 onwards [58,61]. The slope in the charge radii of the Mn isotopes clearly increases from N=36 onwards, confirming the increase in deformation that was observed also in the quadrupole moments [60].…”

Section: New Methods and Highlights Since 2000supporting

confidence: 59%

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 2000supporting

confidence: 59%

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 nuclear moments and mean-square charge radii of Mn between N = 25 and N = 31 were previously studied at the IGISOL facility, JYFL, Jyväskylä [19]. These measurements have now been extended to N = 39 in two collinear laser spectroscopy experiments at ISOLDE, CERN [20][21][22]. With the ground state properties of Mn known from N = 25 across N = 28 up to N = 39, a detailed picture of the changing nuclear structure emerges.…”

Section: Introductionmentioning

confidence: 99%

Changes in nuclear structure along the Mn isotopic chain studied via charge radii

Heylen¹,

Babcock²,

Beerwerth³

et al. 2016

Phys. Rev. C

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The hyperfine spectra of 51,53−64 Mn were measured in two experimental runs using collinear laser spectroscopy at ISOLDE, CERN. Laser spectroscopy was performed on the atomic 3d 5 4s 2 6 S 5/2 → 3d 5 4s4p 6 P 3/2 and ionic 3d 5 4s 5 S2 → 3d 5 4p 5 P3 transitions, yielding two sets of isotope shifts. The mass and field shift factors for both transitions have been calculated in the multiconfiguration Dirac-Fock framework and were combined with a King plot analysis in order to obtain a consistent set of mean-square charge radii which, together with earlier work on neutrondeficient Mn, allow the study of nuclear structure changes from N = 25 across N = 28 up to N = 39. A clear development of deformation is observed towards N = 40, confirming the conclusions of the nuclear moments studies. From a Monte Carlo Shell Model study of the shape in the Mn isotopic chain, it is suggested that the observed development of deformation is not only due to an increase in static prolate deformation but also due to shape fluctuations and triaxiality. The changes in mean-square charge radii are well reproduced using the Duflo-Zuker formula except in the case of large deformation.

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“…Below 68 Ni, high-precision mass spectrometry studies have reached down as far as the manganese chain [19,20], while laser-spectroscopy information is only available for the manganese isotopes [21][22][23]. Time-of-flight mass measurement results in the atomic mass evaluation 2016 [24] suggest a sudden onset of deformation towards N =40 in the chromium chain.…”

mentioning

confidence: 99%

Precision Mass Measurements of Cr58–63 : Nuclear Collectivity Towards the N=40 Island

et al. 2018

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The neutron-rich isotopes 58−63 Cr were produced for the first time at the ISOLDE facility and their masses were measured with the ISOLTRAP spectrometer. The new values are up to 300 times more precise than those in the literature and indicate significantly different nuclear structure from the new mass-surface trend. A gradual onset of deformation is found in this proton and neutron mid-shell region, which is a gateway to the second island of inversion around N =40. In addition to comparisons with density-functional theory and large-scale shell-model calculations, we present predictions from the valence-space formulation of the ab initio in-medium similarity renormalization group, the first such results for open-shell chromium isotopes. PACS numbers: 82.80.Qx, 82.80.Rt, 21.10.Dr, 21.60.CsOver the last few decades, the stability of proton and neutron "magic" numbers has been a major focus of experimental nuclear physics. Early momentum came from the vanishing of the N =20 shell closure near 32 Mg in mass measurements [1] from which arose the idea of the "island of inversion".Extensive effort has followed to examine the classical signatures for magicity in exotic nuclei (e.g empirical shell gap or the energy of the first excited 2 + 1 state). More than three decades later, the robustness of all major shell closures has been assessed [2]. Along the way,

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Quadrupole moments of odd-A 53−63 Mn: Onset of collectivity towards N = 40

Cited by 27 publications

References 31 publications

Collinear laser spectroscopy at ISOLDE: new methods and highlights

Collinear laser spectroscopy at ISOLDE: new methods and highlights

Changes in nuclear structure along the Mn isotopic chain studied via charge radii

Precision Mass Measurements of Cr58–63 : Nuclear Collectivity Towards the N=40 Island

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