Precision mass measurements of rare isotopes near N=Z=33 produced by fast beam fragmentation

P. Schury, C. Bachelet, M. Block, G. Bollen, D. A. Davies, M. Facina, C. M. Folden III, C. Guénaut, J. Huikari, E. Kwan, A. Kwiatkowski, D. J. Morrissey, R. Ringle, G. K. Pang, A. Prinke, J. Savory, H. Schatz, S. Schwarz, C. S. Sumithrarachchi, and T. Sun
Phys. Rev. C 75, 055801 – Published 2 May 2007; Erratum Phys. Rev. C 80, 029905 (2009)

Abstract

Mass measurements of Ga63,64, Ge64,65,66, As66,67,68 and Se69 performed at the LEBIT facility at the NSCL by Penning trap mass spectrometry are presented. The rare isotopes were produced by fast beam fragmentation and in-flight separation, then converted to a low energy beam using a gas stopping technique. Masses of the N=Z nuclei As66 and Ge64 have been determined with uncertainties of δm/m=5×107 and 6×108, respectively, representing a more than ten-fold improvement in precision over previous measurements. For Ga63,64, Ge65,66, As67,68, and Se69 relative mass uncertainties of δm/m<5×108 were obtained. Se69 is found to be 135 keV more bound than the value listed in the 2003 Atomic Mass Evaluation. Using theoretical Coulomb shift energies in combination with the experimental mass values for Ge65,66, As67, and Se69, masses for As65, Se66,67, and Br69 are predicted with an estimated uncertainty of 100 keV. These mass values, in conjunction with our measurements, were used to calculate improved effective lifetimes of the rp-process waiting point nuclei Ge64 and Se68. We find that Ge64 is less of a waiting point while Se68 poses a larger delay in the rp-process than previously thought. The improved mass values in this region were also used to investigate the neutron-proton pairing energy of odd-odd N=Z nuclei.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 24 January 2007

DOI:https://doi.org/10.1103/PhysRevC.75.055801

©2007 American Physical Society

Erratum

Erratum: Precision mass measurements of rare isotopes near N=Z=33 produced by fast beam fragmentation [Phys. Rev. C 75, 055801 (2007)]

P. Schury, C. Bachelet, M. Block, G. Bollen, D. A. Davies, M. Facina, C. M. Folden III, C. Guénaut, J. Huikari, E. Kwan, A. A. Kwiatkowski, D. J. Morrissey, R. Ringle, G. K. Pang, A. Prinke, J. Savory, H. Schatz, S. Schwarz, C. S. Sumithrarachchi, and T. Sun
Phys. Rev. C 80, 029905 (2009)

Authors & Affiliations

P. Schury1,2,*, C. Bachelet1, M. Block1, G. Bollen1,2, D. A. Davies1,3, M. Facina1, C. M. Folden III1, C. Guénaut1, J. Huikari1, E. Kwan1,2, A. Kwiatkowski1,2, D. J. Morrissey1,3, R. Ringle1,2, G. K. Pang1,3, A. Prinke1,2, J. Savory1,2, H. Schatz1,2, S. Schwarz1, C. S. Sumithrarachchi1,3, and T. Sun1,2

  • 1National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
  • 2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 3Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA

  • *Corresponding author. Email address: schury@nscl.msu.edu

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 75, Iss. 5 — May 2007

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
×