Mass measurements near the r-process path using the Canadian Penning Trap mass spectrometer

J. Van Schelt*, D. Lascar, G. Savard, J. A. Clark, S. Caldwell, A. Chaudhuri, J. Fallis, J. P. Greene, A. F. Levand, G. Li, K. S. Sharma, M. G. Sternberg, T. Sun, B. J. Zabransky

*Corresponding author for this work

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Abstract

The masses of 40 neutron-rich nuclides from Z=51 to 64 were measured at an average precision of δm/m=10-7 using the Canadian Penning Trap mass spectrometer at Argonne National Laboratory. The measurements, of fission fragments from a 252Cf spontaneous fission source in a helium gas catcher, approach the predicted path of the astrophysical r process. Where overlap exists, this data set is largely consistent with previous measurements from Penning traps, storage rings, and reaction energetics, but large systematic deviations are apparent in β-endpoint measurements. Differences in mass excess from the 2003 Atomic Mass Evaluation of up to 400keV are seen, as well as systematic disagreement with various mass models.

Original languageEnglish (US)
Article number045805
JournalPhysical Review C - Nuclear Physics
Volume85
Issue number4
DOIs
StatePublished - Apr 9 2012

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Van Schelt, J., Lascar, D., Savard, G., Clark, J. A., Caldwell, S., Chaudhuri, A., Fallis, J., Greene, J. P., Levand, A. F., Li, G., Sharma, K. S., Sternberg, M. G., Sun, T., & Zabransky, B. J. (2012). Mass measurements near the r-process path using the Canadian Penning Trap mass spectrometer. Physical Review C - Nuclear Physics, 85(4), [045805]. https://doi.org/10.1103/PhysRevC.85.045805