Approaching the $N=82$ shell closure with mass measurements of Ag and Cd isotopes

Approaching the $N = 82$ shell closure with mass measurements of Ag and Cd isotopes

M. Breitenfeldt, Ch. Borgmann, G. Audi, S. Baruah, D. Beck, K. Blaum, Ch. Böhm, R. B. Cakirli, R. F. Casten, P. Delahaye, M. Dworschak, S. George, F. Herfurth, A. Herlert, A. Kellerbauer, M. Kowalska, D. Lunney, E. Minaya-Ramirez, S. Naimi, D. Neidherr, M. Rosenbusch, R. Savreux, S. Schwarz, L. Schweikhard, and C. Yazidjian

Phys. Rev. C 81, 034313 – Published 26 March 2010

Abstract

Mass measurements of neutron-rich Cd and Ag isotopes were performed with the Penning trap mass spectrometer ISOLTRAP. The masses of $^{112, 114 - 124}$ Ag and $^{114, 120, 122 - 124, 126, 128}$ Cd, determined with relative uncertainties between $2 \times 10^{- 8}$ and $2 \times 10^{- 7}$ , resulted in significant corrections and improvements of the mass surface. In particular, the mass of ${}^{124}{Ag}$ was previously unknown. In addition, other masses that had to be inferred from $Q$ values of nuclear decays and reactions have now been measured directly. The analysis includes various mass differences, namely the two-neutron separation energies, the applicability of the Garvey-Kelson relations, double differences of masses $δ V_{pn}$ , which give empirical proton-neutron interaction strengths, as well as a comparison with recent microscopic calculations. The $δ V_{pn}$ results reveal that for even-even nuclides around ${}^{132}{Sn}$ the trends are similar to those in the ${}^{208}{Pb}$ region.

Received 13 November 2009

DOI:https://doi.org/10.1103/PhysRevC.81.034313

Authors & Affiliations

M. Breitenfeldt^1,*, Ch. Borgmann², G. Audi³, S. Baruah^1,†, D. Beck⁴, K. Blaum^2,5, Ch. Böhm², R. B. Cakirli^2,6, R. F. Casten⁷, P. Delahaye^8,‡, M. Dworschak⁴, S. George^2,§, F. Herfurth⁴, A. Herlert⁸, A. Kellerbauer⁹, M. Kowalska⁸, D. Lunney³, E. Minaya-Ramirez³, S. Naimi³, D. Neidherr¹⁰, M. Rosenbusch¹, R. Savreux⁴, S. Schwarz¹¹, L. Schweikhard¹, and C. Yazidjian⁴

¹Institut für Physik, Ernst-Moritz-Arndt-Universität, D-17487 Greifswald, Germany
²Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany
³CSNSM-IN2P3-CNRS, Université de Paris Sud, F-91405 Orsay, France
⁴GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, D-64291 Darmstadt, Germany
⁵Ruprecht-Karls-Universität, Physikalisches Institut, D-69120 Heidelberg, Germany
⁶Department of Physics, University of Istanbul, Istanbul, Turkey
⁷Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, USA
⁸CERN, Physics Department, 1211 Geneva 23, Switzerland
⁹Commission European Communities, Joint Research Center, European Institute for Transuranium Elements, D-76125 Karlsruhe, Germany
¹⁰Institut für Physik, Johannes Gutenberg-Universität, D-55128 Mainz, Germany
¹¹NSCL, Department of Physics and Astronomy, Michigan State University, Michigan 48824, East Lansing, USA

^*Corresponding author: Martin.Breitenfeldt@cern.ch; present address: Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
^†Present address: Bhabha Atomic Research Centre, Trombay, 400085 Mumbai, India.
^‡Present address: Grand Accélérateur National d’Ions Lourds, 14076 CAEN Cedex 05, France.
^§Present address: NSCL, Department of Physics and Astronomy, Michigan State University, MI 48824, East Lansing, USA.

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Vol. 81, Iss. 3 — March 2010

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covering nuclear physics