Hyperfine structure and nuclear magnetic moments of the praseodymium isotopes 135,136,137 Pr
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Hyperfine structure and nuclear magnetic moments of the praseodymium isotopes135,136,137 Pr 1 · Wilfried Nortersh 1,2 · Mark L. Bissell3,4 · Klaus Blaum5 · ¨ ¨ ¨ Nadja Frommgen auser 1,2 1 1· ¨ Kramer ¨ Christopher Geppert · Michael Hammen · Magdalena Kowalska6 · Jorg Kim Kreim5 · Andreas Krieger1,2 · Yuri A. Litvinov7 · Rainer Neugart1,5 · 7 · Deyan T. Yordanov5,8 ´ Gerda Neyens3 · Jasna Papuga3 · Rodolfo Sanchez
© Springer Nature Switzerland AG 2019
Abstract Collinear laser spectroscopy was applied to measure the hyperfine structure of 135−137 Pr at ISOLDE/CERN. Combined with measurements of the stable isotope 141 Pr at the TRIGASPEC setup in Mainz we were able to determine the magnetic moments of the neutrondeficient isotopes 135 Pr, 136 Pr and 137 Pr for the first time. Keywords Hyperfine structure · Laser spectroscopy · Magnetic moments · Electron capture decay · Collinear laser spectroscopy · Praseodymium
1 Motivation Properties of nuclear decays caused by the weak interaction can differ significantly for nuclei in highly charged ions compared to those embedded in the corresponding neutral atom [1, 2]. The isotope 140 Pr (Z = 59) decays to 140 Ce via an allowed Gamow-Teller decay ( = 1, no parity change) [3]. Thereby a proton is converted into a neutron either This article is part of the Topical Collection on Proceedings of the International Conference on Hyperfine Interactions and their Applications (HYPERFINE 2019), Goa, India, 10-15 February 2019 Edited by S. N. Mishra, P. L. Paulose and R. Palit Wilfried N¨ortersh¨auser
[email protected] 1
Institut f¨ur Kernchemie, Universit¨at Mainz, D-55099 Mainz, Germany
2
Institut f¨ur Kernphysik, Technische Universit¨at Darmstadt, D-64289 Darmstadt, Germany
3
Instituut voor Kern- en Stralingsfysica, KU Leuven, B-3001 Leuven, Belgium
4
Present address: School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
5
Max-Planck-Institut f¨ur Kernphysik, D-69117 Heidelberg, Germany
6
Experimental Physics Department, CERN, CH-1211 Geneva, Switzerland
7
GSI Helmholtzzentrum f¨ur Schwerionenforschung, D-64291 Darmstadt, Germany
8
Present address: Institut de Physique Nucl´eaire, CNRS-IN2P3, 91406 Orsay, France
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via three-body β + -decay or via two-body electron-capture (EC) decay (p + e− → n + νe ). A measurement of the electron-capture decay constant of hydrogen-like 140 Pr58+ ions in the experimental storage ring (ESR) found this value to be increased by a factor of 1.49(8) compared to helium-like 140 Pr 57+ [4]. This is counter-intuitive since one would expect the He-like charge state to decay more rapidly because the electron density at the nucleus is roughly twice as large as in H-like Pr [5]. This observation was explained by taking the conservation of total angular momentum into account [6–8]. However, this argument relies on a positive nuclear magnetic moment of 140 Pr, which has so far not been measured but is deduced from the magnetic moments of neig
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