Maqola

Nuclear Spins and Moments of Ga Isotopes Reveal Sudden Structural Changes between<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>40</mml:mn></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>50</mml:mn></mml:math>

B. ChealSchool of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United Kingdom. [email protected]E. ManéSchool of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United KingdomJ. BillowesSchool of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United KingdomM. L. BissellInstituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven, BelgiumK. BlaumMax-Planck-Institut für Kernphysik, D-69117 Heidelberg, GermanyB. A. BrownNational Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1321, USAF. C. CharlwoodSchool of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United KingdomK. T. FlanaganI.P.N. Orsay, F-91940 Orsay Cedex, FranceD. H. ForestSchool of Physics and Astronomy, The University of Birmingham, Birmingham, B15 2TT, United KingdomCh. GeppertGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanyMareki HonmaCenter for Mathematical Sciences, University of Aizu, Tsuruga, Ikki-machi, Aizu-Wakamatsu, Fukushima 965-8580, JapanA. JokinenDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandM. KowalskaMax-Planck-Institut für Kernphysik, D-69117 Heidelberg, GermanyA. KriegerInstitut für Kernchemie, Universität Mainz, D-55128 Mainz, GermanyJörg KrämerInstitut für Kernchemie, Universität Mainz, D-55128 Mainz, GermanyI. D. MooreDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandR. NeugartInstitut für Kernchemie, Universität Mainz, D-55128 Mainz, GermanyG. NeyensInstituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven, BelgiumW. NörtershäuserGSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, GermanyMichael SchugMax-Planck-Institut für Kernphysik, D-69117 Heidelberg, GermanyH. H. StrokeDepartment of Physics, New York University, New York, New York 10003, USAP. VingerhoetsInstituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven, BelgiumD. T. YordanovMax-Planck-Institut für Kernphysik, D-69117 Heidelberg, GermanyM. ŽákováInstitut für Kernchemie, Universität Mainz, D-55128 Mainz, Germany

2010lv

ABI

Annotatsiya

Collinear laser spectroscopy was performed on Ga ($Z=31$) isotopes at ISOLDE, CERN. A gas-filled linear Paul trap (ISCOOL) was used to extend measurements towards very neutron-rich isotopes ($N=36--50$). A ground state (g.s.) spin $I=1/2$ is measured for $^{73}\mathrm{Ga}$, being near degenerate with a $3/{2}^{\ensuremath{-}}$ isomer ($75\text{ }\text{ }\mathrm{eV}\ensuremath{\lesssim}{E}_{\mathrm{ex}}\ensuremath{\lesssim}1\text{ }\text{ }\mathrm{keV}$). The $^{79}\mathrm{Ga}$ g.s., with $I=3/2$, is dominated by protons in the $\ensuremath{\pi}{f}_{5/2}$ orbital and in $^{81}\mathrm{Ga}$ the $5/{2}^{\ensuremath{-}}$ level becomes the g.s. The data are compared to shell-model calculations in the ${f}_{5/2}p{g}_{9/2}$ model space, calling for further theoretical developments and new experiments.

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DOI: 10.1103/physrevlett.104.252502

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