Mass measurements in the vicinity of the r p-process and the nu p-process paths with the Penning trap facilities JYFLTRAP and SHIPTRAP

C. Weber, V. -V. Elomaa, R. Ferrer, C. Froehlich, D. Ackermann, J. Aystoe, G. Audi, L. Batist, K. Blaum, M. Block, A. Chaudhuri, M. Dworschak, S. Eliseev, T. Eronen, U. Hager, J. Hakala, F. Herfurth, F. P. Hessberger, S. Hofmann, A. JokinenA. Kankainen, H. -J. Kluge, K. Langanke, A. Martin, G. Martinez-Pinedo, M. Mazzocco, I. D. Moore, J. B. Neumayr, Yu. N. Novikov, H. Penttilae, W. R. Plass, A. V. Popov, S. Rahaman, T. Rauscher, C. Rauth, J. Rissanen, D. Rodriguez, A. Saastamoinen, C. Scheidenberger, L. Schweikhard, D. M. Seliverstov, T. Sonoda, F. -K. Thielemann, P. G. Thirolf, G. K. Vorobjev

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Abstract

The masses of very neutron-deficient nuclides close to the astrophysical r p- and nu p-process paths have been determined with the Penning trap facilities JYFLTRAP at JYFL/Jyvaskyla and SHIPTRAP at GSI/Darmstadt. Isotopes from yttrium (Z=39) to palladium (Z=46) have been produced in heavy-ion fusion-evaporation reactions. In total, 21 nuclides were studied, and almost half of the mass values were experimentally determined for the first time: (88)Tc, (90-92)Ru, (92-94)Rh, and (94,95)Pd. For the (95)Pd(m), (21/2(+)) high-spin state, a first direct mass determination was performed. Relative mass uncertainties of typically delta m/m=5x10(-8) were obtained. The impact of the new mass values has been studied in nu p-process nucleosynthesis calculations. The resulting reaction flow and the final abundances are compared with those obtained with the data of the Atomic Mass Evaluation 2003.

Original languageEnglish
Article number054310
Number of pages18
JournalPhysical Review C (nuclear physics)
Volume78
Issue number5
DOIs
Publication statusPublished - Nov 2008

Keywords

  • END-POINT
  • CARBON CLUSTERS
  • DELAYED PROTON EMISSION
  • ATOMIC MASSES
  • CLASSICAL CANONICAL FORMALISM
  • HIGH-SPIN
  • BETA-DECAY
  • NEUTRON-DEFICIENT ISOTOPES
  • SHELL-MODEL CALCULATIONS
  • 2-PROTON RADIOACTIVITY

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