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Chen L, Walker PM, Geissel H, Litvinov YA, Beckert K, Beller P, Bosch F, Boutin D, Caceres L, Carroll JJ, Cullen DM, Cullen IJ, Franzke B, Gerl J, Górska M, Jones GA, Kishada A, Knöbel R, Kozhuharov C, Kurcewicz J, Litvinov SA, Liu Z, Mandal S, Montes F, Münzenberg G, Nolden F, Ohtsubo T, Patyk Z, Plaß WR, Podolyák Z, Rigby S, Saito N, Saito T, Scheidenberger C, Simpson EC, Shindo M, Steck M, Sun B, Williams SJ, Weick H, Winkler M, Wollersheim HJ, Yamaguchi T. Direct observation of long-lived isomers in 212Bi. Phys Rev Lett 2013; 110:122502. [PMID: 25166798 DOI: 10.1103/physrevlett.110.122502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2012] [Indexed: 06/03/2023]
Abstract
Long-lived isomers in (212)Bi have been studied following (238)U projectile fragmentation at 670 MeV per nucleon. The fragmentation products were injected as highly charged ions into a storage ring, giving access to masses and half-lives. While the excitation energy of the first isomer of (212)Bi was confirmed, the second isomer was observed at 1478(30) keV, in contrast to the previously accepted value of >1910 keV. It was also found to have an extended Lorentz-corrected in-ring half-life >30 min, compared to 7.0(3) min for the neutral atom. Both the energy and half-life differences can be understood as being due a substantial, though previously unrecognized, internal decay branch for neutral atoms. Earlier shell-model calculations are now found to give good agreement with the isomer excitation energy. Furthermore, these and new calculations predict the existence of states at slightly higher energy that could facilitate isomer deexcitation studies.
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Affiliation(s)
- L Chen
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany and II Physikalisches Institut, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany and Cyclotron Institute, Texas A & M University, Texas 77843, USA
| | - P M Walker
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
| | - H Geissel
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany and II Physikalisches Institut, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany
| | - Yu A Litvinov
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany and Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - K Beckert
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - P Beller
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - F Bosch
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - D Boutin
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - L Caceres
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - J J Carroll
- US Army Research Laboratory, Adelphi, Maryland 20783, USA
| | - D M Cullen
- Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom
| | - I J Cullen
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
| | - B Franzke
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - J Gerl
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - M Górska
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - G A Jones
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
| | - A Kishada
- Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom
| | - R Knöbel
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - C Kozhuharov
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - J Kurcewicz
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - S A Litvinov
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - Z Liu
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - S Mandal
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - F Montes
- Michigan State University, East Lansing, Michigan 48824, USA
| | - G Münzenberg
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - F Nolden
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - T Ohtsubo
- Department of Physics, Niigata University, Niigata 950-2181, Japan
| | - Z Patyk
- National Centre for Nuclear Research, Hoa 69, 00-681 Warszawa, Poland
| | - W R Plaß
- II Physikalisches Institut, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany
| | - Zs Podolyák
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
| | - S Rigby
- Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom
| | - N Saito
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - T Saito
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - C Scheidenberger
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany and II Physikalisches Institut, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany
| | - E C Simpson
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
| | - M Shindo
- Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
| | - M Steck
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - B Sun
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - S J Williams
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
| | - H Weick
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - M Winkler
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - H-J Wollersheim
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - T Yamaguchi
- Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan
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Chen L, Litvinov YA, Plass WR, Beckert K, Beller P, Bosch F, Boutin D, Caceres L, Cakirli RB, Carroll JJ, Casten RF, Chakrawarthy RS, Cullen DM, Cullen IJ, Franzke B, Geissel H, Gerl J, Górska M, Jones GA, Kishada A, Knöbel R, Kozhuharov C, Litvinov SA, Liu Z, Mandal S, Montes F, Münzenberg G, Nolden F, Ohtsubo T, Patyk Z, Podolyák Z, Propri R, Rigby S, Saito N, Saito T, Scheidenberger C, Shindo M, Steck M, Ugorowski P, Walker PM, Williams S, Weick H, Winkler M, Wollersheim HJ, Yamaguchi T. Schottky mass measurement of the 208Hg isotope: implication for the proton-neutron interaction strength around doubly magic 208Pb. Phys Rev Lett 2009; 102:122503. [PMID: 19392270 DOI: 10.1103/physrevlett.102.122503] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2008] [Indexed: 05/27/2023]
Abstract
Time-resolved Schottky mass spectrometry has been applied to uranium projectile fragments which yielded the mass value for the 208Hg (Z=80, N=128) isotope. The mass excess value of ME=-13 265(31) keV has been obtained, which has been used to determine the proton-neutron interaction strength in 210Pb, as a double difference of atomic masses. The results show a dramatic variation of the strength for lead isotopes when crossing the N=126 neutron shell closure, thus confirming the empirical predictions that this interaction strength is sensitive to the overlap of the wave functions of the last valence neutrons and protons.
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Affiliation(s)
- L Chen
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, 64291 Darmstadt, Germany
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Litvinov YA, Bosch F, Geissel H, Kurcewicz J, Patyk Z, Winckler N, Batist L, Beckert K, Boutin D, Brandau C, Chen L, Dimopoulou C, Fabian B, Faestermann T, Fragner A, Grigorenko L, Haettner E, Hess S, Kienle P, Knöbel R, Kozhuharov C, Litvinov SA, Maier L, Mazzocco M, Montes F, Münzenberg G, Musumarra A, Nociforo C, Nolden F, Pfützner M, Plass WR, Prochazka A, Reda R, Reuschl R, Scheidenberger C, Steck M, Stöhlker T, Torilov S, Trassinelli M, Sun B, Weick H, Winkler M. Measurement of the beta+ and orbital electron-capture decay rates in fully ionized, hydrogenlike, and heliumlike 140Pr ions. Phys Rev Lett 2007; 99:262501. [PMID: 18233571 DOI: 10.1103/physrevlett.99.262501] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2007] [Indexed: 05/25/2023]
Abstract
We report on the first measurement of the beta+ and orbital electron-capture decay rates of 140Pr nuclei with the simplest electron configurations: bare nuclei, hydrogenlike, and heliumlike ions. The measured electron-capture decay constant of hydrogenlike 140Pr58+ ions is about 50% larger than that of heliumlike 140Pr57+ ions. Moreover, 140Pr ions with one bound electron decay faster than neutral 140Pr0+ atoms with 59 electrons. To explain this peculiar observation one has to take into account the conservation of the total angular momentum, since only particular spin orientations of the nucleus and of the captured electron can contribute to the allowed decay.
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Affiliation(s)
- Yu A Litvinov
- Gesellschaft für Schwerionenforschung GSI, Planckstrasse 1, 64291 Darmstadt, Germany
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Litvinov YA, Bürvenich TJ, Geissel H, Novikov YN, Patyk Z, Scheidenberger C, Attallah F, Audi G, Beckert K, Bosch F, Falch M, Franzke B, Hausmann M, Kerscher T, Klepper O, Kluge HJ, Kozhuharov C, Löbner KEG, Madland DG, Maruhn JA, Münzenberg G, Nolden F, Radon T, Steck M, Typel S, Wollnik H. Isospin dependence in the odd-even staggering of nuclear binding energies. Phys Rev Lett 2005; 95:042501. [PMID: 16090802 DOI: 10.1103/physrevlett.95.042501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2005] [Indexed: 05/03/2023]
Abstract
The FRS-ESR facility at GSI provides unique conditions for precision measurements of large areas on the nuclear mass surface in a single experiment. Values for masses of 604 neutron-deficient nuclides (30 < or = Z < or = 92) were obtained with a typical uncertainty of 30 microu. The masses of 114 nuclides were determined for the first time. The odd-even staggering (OES) of nuclear masses was systematically investigated for isotopic chains between the proton shell closures at Z = 50 and Z = 82. The results were compared with predictions of modern nuclear models. The comparison revealed that the measured trend of OES is not reproduced by the theories fitted to masses only. The spectral pairing gaps extracted from models adjusted to both masses, and density related observables of nuclei agree better with the experimental data.
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Affiliation(s)
- Yu A Litvinov
- Gesellschaft für Schwerionenforschung GSI, Darmstadt, Germany
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