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7 results on '"Grob, L. K."'

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

Author

Heylen, H., Babcock, C., Beerwerth, R., Billowes, J., Bissell, M. L., Blaum, K., Bonnard, J., Campbell, P., Cheal, B., Goodacre, T. Day, Fedorov, D., Fritzsche, S., Ruiz, R. F. Garcia, Geithner, W., Geppert, Ch., Gins, W., Grob, L. K., Kowalska, M., Kreim, K., Lenzi, S. M., Moore, I. D., Maass, B., Malbrunot-Ettenauer, S., Marsh, B., Neugart, R., Neyens, G., Nortershauser, W., Otsuka, T., Papuga, J., Rossel, R., Rothe, S., Sanchez, R., Tsunoda, Y., Wraith, C., Xie, L., Yang, X. F., and Yordanov, D. T.

Subjects
Nuclear Experiment
Abstract

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 $3d^5\ 4s^2\ ^{6}\text{S}_{5/2}\rightarrow 3d^5\ 4s4p\ ^{6}\text{P}_{3/2}$ and ionic $3d^5\ 4s\ ^{5}\text{S}_2 \rightarrow 3d^5\ 4p\ ^{5}\text{P}_3$ 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 neutron-deficient 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., Comment: 9 figures, submitted to PRC

Published
2016
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2. Isomer shift and magnetic moment of the long-lived 1/2$^{+}$ isomer in $^{79}_{30}$Zn$_{49}$: signature of shape coexistence near $^{78}$Ni

Author

Yang, X. F., Wraith, C., Xie, L., Babcock, C., Billowes, J., Bissell, M. L., Blaum, K., Cheal, B., Flanagan, K. T., Ruiz, R. F. Garcia, Gins, W., Gorges, C., Grob, L. K., Heylen, H., Kaufmann, S., Kowalska, M., Kraemer, J., Malbrunot-Ettenauer, S., Neugart, R., Neyens, G., Nörtershäuser, W., Papuga, J., Sánchez, R., and Yordanov, D. T.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Collinear laser spectroscopy has been performed on the $^{79}_{30}$Zn$_{49}$ isotope at ISOLDE-CERN. The existence of a long-lived isomer with a few hundred milliseconds half-life was confirmed, and the nuclear spins and moments of the ground and isomeric states in $^{79}$Zn as well as the isomer shift were measured. From the observed hyperfine structures, spins $I = 9/2$ and $I = 1/2$ are firmly assigned to the ground and isomeric states. The magnetic moment $\mu$ ($^{79}$Zn) = $-$1.1866(10) $\mu_{\rm{N}}$, confirms the spin-parity $9/2^{+}$ with a $\nu g_{9/2}^{-1}$ shell-model configuration, in excellent agreement with the prediction from large scale shell-model theories. The magnetic moment $\mu$ ($^{79m}$Zn) = $-$1.0180(12) $\mu_{\rm{N}}$ supports a positive parity for the isomer, with a wave function dominated by a 2h-1p neutron excitation across the $N = 50$ shell gap. The large isomer shift reveals an increase of the intruder isomer mean square charge radius with respect to that of the ground state: $\delta \langle r^{2}_{c}\rangle^{79,79m}$ = +0.204(6) fm$^{2}$, providing first evidence of shape coexistence., Comment: 5 pages, 4 figures, 1 table, Accepeted by Phys. Rev. Lett. (2016)

Published
2016
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3. Nuclear charge radii of ⁶²⁻⁸⁰Zn and their dependence on cross-shell proton excitations

Author

Xie, Liang, Yang, Xiaofei, Bieron, Jacek, Wraith, Calvin, Flanagan, Kieran T., Garcia Ruiz, R. F., Gins, Wouter, Gaigalas, Gediminas, Godefroid, Michel, Gorges, Christian, Grob, L. K., Heylen, Hanne, Jo̊nsson, Per, Kaufmann, Simon, Kowalska, Magdalena A., Krämer, Jörg, Malbrunot-Ettenauer, S., Neugart, Rainer, Neyens, Gerda, Nörtershäuser, Wilfried, Otsuka, Takaharu, Papuga, Jasna, Sánchez, Rodolfo M., Tsunoda, Yusuke, Yordanov, Deyan Todorov, Babcock, Carla, Billowes, Jonathan, Bissell, Mark L., Blaum, Klaus, Cheal, Bradley, Filippin, Livio, Xie, Liang, Yang, Xiaofei, Bieron, Jacek, Wraith, Calvin, Flanagan, Kieran T., Garcia Ruiz, R. F., Gins, Wouter, Gaigalas, Gediminas, Godefroid, Michel, Gorges, Christian, Grob, L. K., Heylen, Hanne, Jo̊nsson, Per, Kaufmann, Simon, Kowalska, Magdalena A., Krämer, Jörg, Malbrunot-Ettenauer, S., Neugart, Rainer, Neyens, Gerda, Nörtershäuser, Wilfried, Otsuka, Takaharu, Papuga, Jasna, Sánchez, Rodolfo M., Tsunoda, Yusuke, Yordanov, Deyan Todorov, Babcock, Carla, Billowes, Jonathan, Bissell, Mark L., Blaum, Klaus, Cheal, Bradley, and Filippin, Livio

Abstract

Nuclear charge radii of ⁶²⁻⁸⁰Zn have been determined using collinear laser spectroscopy of bunched ion beams at CERN-ISOLDE. The subtle variations of observed charge radii, both within one isotope and along the full range of neutron numbers, are found to be well described in terms of the proton excitations across the Z = 28 shell gap, as predicted by large-scale shell model calculations. It comprehensively explains the changes in isomer-to-ground state mean square charge radii of ⁶⁹⁻⁷⁹Zn, the inversion of the odd-even staggering around N = 40 and the odd-even staggering systematics of the Zn charge radii. With two protons above Z = 28, the observed charge radii of the Zn isotopic chain show a cumulative effect of different aspects of nuclear structure including single particle structure, shell closure, correlations and deformations near the proposed doubly magic nuclei, ⁶⁸Ni and ⁷⁸Ni.

Published
2022

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

Author

Heylen, H., Babcock, C., Beerwerth, R., Goodacre, T. Day, Billowes, J., Bissell, M. L., Blaum, K., Garcia Ruiz, R. F., Bonnard, J., Campbell, P., Cheal, B., Fedorov, D., Day Goodacre, T., Fritzsche, S., Geithner, W., Geppert, C.-H., Gins, W., Grob, L. K., Kowalska, M., Kreim, K., Lenzi, S. M., Kreim, S., Moore, Iain D., Maass, B., Malbrunot-Ettenauer, S., Marsh, B., Neugart, R., Neyens, G., Nörtershäuser, W., Otsuka, T., Papuga, J., Rossel, R., Rothe, S., Sánchez, R., Tsunoda, Y., Wraith, C., Xie, L., Yang, X. F., Yordanov, D. T., Heylen, H., Babcock, C., Beerwerth, R., Goodacre, T. Day, Billowes, J., Bissell, M. L., Blaum, K., Garcia Ruiz, R. F., Bonnard, J., Campbell, P., Cheal, B., Fedorov, D., Day Goodacre, T., Fritzsche, S., Geithner, W., Geppert, C.-H., Gins, W., Grob, L. K., Kowalska, M., Kreim, K., Lenzi, S. M., Kreim, S., Moore, Iain D., Maass, B., Malbrunot-Ettenauer, S., Marsh, B., Neugart, R., Neyens, G., Nörtershäuser, W., Otsuka, T., Papuga, J., Rossel, R., Rothe, S., Sánchez, R., Tsunoda, Y., Wraith, C., Xie, L., Yang, X. F., and Yordanov, D. T.

Abstract

The hyperfine spectra of Mn-51,Mn-53-64 were measured in two experimental runs using collinear laser spectroscopy at ISOLDE, CERN. Laser spectroscopy was performed on the atomic 3d(5) 4s(2) S-6(5/2) -> 3d(5) 4s4p P-6(3/2) and ionic 3d(5) 4s S-5(2) -> 3d(5) 4p P-5(3) 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 neutron-deficient 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.

Published
2022

5. Nuclear charge radii of Zn and their dependence on cross-shell proton excitations

Author

Xie, Liang, Yang, Xiaofei, Bieron, Jacek, Wraith, Calvin, Flanagan, Kieran T., Garcia Ruiz, R. F., Gins, Wouter, Gaigalas, Gediminas, Godefroid, Michel, Gorges, Christian, Grob, L. K., Heylen, Hanne, Jo��nsson, Per, Kaufmann, Simon, Kowalska, Magdalena A., Kr��mer, J��rg, Malbrunot-Ettenauer, S., Neugart, Rainer, Neyens, Gerda, N��rtersh��user, Wilfried, Otsuka, Takaharu, Papuga, Jasna, S��nchez, Rodolfo M., Tsunoda, Yusuke, Yordanov, Deyan Todorov, Babcock, Carla, Billowes, Jonathan, Bissell, Mark L., Blaum, Klaus, Cheal, Bradley, and Filippin, Livio

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Nuclear charge radii of $^{62−80}$Zn have been determined using collinear laser spectroscopy of bunched ion beams at CERN-ISOLDE. The subtle variations of observed charge radii, both within one isotope and along the full range of neutron numbers, are found to be well described in terms of the proton excitations across the Z=28 shell gap, as predicted by large-scale shell model calculations. It comprehensively explains the changes in isomer-to-ground state mean square charge radii of $^{69−79}$Zn, the inversion of the odd-even staggering around N=40 and the odd-even staggering systematics of the Zn charge radii. With two protons above Z=28, the observed charge radii of the Zn isotopic chain show a cumulative effect of different aspects of nuclear structure including single particle structure, shell closure, correlations and deformations near the proposed doubly magic nuclei, $^{68}$Ni and $^{78}$Ni.

Published
2019

6. Nuclear charge radii of Zn62-80 and their dependence on cross-shell proton excitations

Author

Xie, L., Yang, X. F., Wraith, C., Babcock, C., Bieroń, J., Billowes, J., Bissell, M. L., Blaum, K., Cheal, B., Filippin, L., Flanagan, K. T., Ruiz, R. F. Garcia, Gins, W., Gaigalas, G., Godefroid, M., Gorges, C., Grob, L. K., Heylen, H., Jönsson, Per, Kaufmann, S., Kowalska, M., Krämer, J., Malbrunot-Ettenauer, S., Neugart, R., Neyens, G., Nörtershäuser, W., Otsuka, T., Papuga, J., Sanchez, R., Tsunoda, Y., Yordanov, D. T., Xie, L., Yang, X. F., Wraith, C., Babcock, C., Bieroń, J., Billowes, J., Bissell, M. L., Blaum, K., Cheal, B., Filippin, L., Flanagan, K. T., Ruiz, R. F. Garcia, Gins, W., Gaigalas, G., Godefroid, M., Gorges, C., Grob, L. K., Heylen, H., Jönsson, Per, Kaufmann, S., Kowalska, M., Krämer, J., Malbrunot-Ettenauer, S., Neugart, R., Neyens, G., Nörtershäuser, W., Otsuka, T., Papuga, J., Sanchez, R., Tsunoda, Y., and Yordanov, D. T.

Abstract

Nuclear charge radii of Zn62-80 have been determined using collinear laser spectroscopy of bunched ion beams at CERN-ISOLDE. The subtle variations of observed charge radii, both within one isotope and along the full range of neutron numbers, are found to be well described in terms of the proton excitations across the Z = 28 shell gap, as predicted by large-scale shell model calculations. It comprehensively explains the changes in isomer-to-ground state mean square charge radii of Zn69-79, the inversion of the odd-even staggering around N = 40 and the odd-even staggering systematics of the Zn charge radii. With two protons above Z = 28, the observed charge radii of the Zn isotopic chain show a cumulative effect of different aspects of nuclear structure including single particle structure, shell closure, correlations and deformations near the proposed doubly magic nuclei, Ni-68 and Ni-78. (C) 2019 The Author(s). Published by Elsevier B.V.

Published
2019
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7. Investigating the large deformation of the 5/2(+) isomeric state in Zn-73: An indicator for triaxiality

Author

Yang, X. F., Tsunoda, Y., Babcock, C., Billowes, J., Bissell, M. L., Blaum, K., Cheal, B., Flanagan, K. T., Garcia Ruiz, R. F., Gins, W., Gorges, C., Grob, L. K., Heylen, H., Kaufmann, S., Kowalska, M., Krämer, J., Malbrunot-Ettenauer, S., Neugart, R., Neyens, G., Nörtershäuser, W., Otsuka, T., Papuga, J., Sánchez, R., Wraith, C., Xie, L., and Yordanov, D. T.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Recently reported nuclear spins and moments of neutron-rich Zn isotopes measured at ISOLDE-CERN [C. Wraith et al., Phys. Lett. B 771, 385 (2017)PYLBAJ0370-269310.1016/j.physletb.2017.05.085] show an uncommon behavior of the isomeric state in Zn73. Additional details relating to the measurement and analysis of the Zn73m hyperfine structure are addressed here to further support its spin-parity assignment 5/2+ and to estimate its half-life. A systematic investigation of this 5/2+ isomer indicates that significant collectivity appears due to proton/neutron E2 excitations across the proton Z = 28 and neutron N = 50 shell gaps. This is confirmed by the good agreement of the observed quadrupole moments with large scale Monte Carlo shell model calculations. In addition, potential energy surface calculations in combination with T plots reveal a triaxial shape for this isomeric state.

Published
2018
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