Surveying the N=40 island of inversion with new manganese masses

S. Naimi, G. Audi, D. Beck, K. Blaum, Ch. Böhm, Ch. Borgmann, M. Breitenfeldt, S. George, F. Herfurth, A. Herlert, A. Kellerbauer, M. Kowalska, D. Lunney, E. Minaya Ramirez, D. Neidherr, M. Rosenbusch, L. Schweikhard, R. N. Wolf, and K. Zuber
Phys. Rev. C 86, 014325 – Published 20 July 2012

Abstract

High-precision mass measurements of neutron-rich 5766Mn and 6163Fe isotopes are reported. The new mass surface shows no shell closure at N=40. In contrast, there is an increase of the two-neutron separation energy at N=38. This behavior is consistent with the onset of collectivity due to the occupation of intruder states from higher orbits, in analogy with the well known “island of inversion” around N=20. Our results indicate that the neutron-rich Mn isotopes, starting from 63Mn, are most likely within the new island of inversion. From the new mass surface, we evaluate the empirical proton-neutron interaction and the pairing gap, both playing a significant role in the structural changes in this region.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 29 October 2011

DOI:https://doi.org/10.1103/PhysRevC.86.014325

©2012 American Physical Society

Authors & Affiliations

S. Naimi1,2, G. Audi1, D. Beck3, K. Blaum4,5, Ch. Böhm4,5, Ch. Borgmann4,5, M. Breitenfeldt6,*, S. George4,7,†, F. Herfurth3, A. Herlert8,‡, A. Kellerbauer4, M. Kowalska8, D. Lunney1, E. Minaya Ramirez1,§, D. Neidherr4,7,§, M. Rosenbusch6, L. Schweikhard6, R. N. Wolf6, and K. Zuber9

  • 1CSNSM-IN2P3-CNRS, Université de Paris Sud, 91405 Orsay, France
  • 2Nishina Accelerator-based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 3GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
  • 4Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
  • 5Fakultät für Physik und Astronomie, Ruprecht-Karls-Universität, 69120 Heidelberg, Germany
  • 6Institut für Physik, Ernst-Moritz-Arndt-Universität, 17487 Greifswald, Germany
  • 7Institut für Physik, Johannes Gutenberg-Universität, 55128 Mainz, Germany
  • 8CERN, Physics Department, 1211 Geneva 23, Switzerland
  • 9Institut für Kern- und Teilchenphysik, Technische Universität, 01069 Dresden, Germany

  • *Present address: Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium.
  • Present address: NSCL, Department of Physics and Astronomy, Michigan State University, MI 48824, East Lansing, USA.
  • Present address: FAIR GmbH, Planckstr. 1, 64291 Darmstadt, Germany.
  • §Present address: GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany.

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 86, Iss. 1 — July 2012

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×