First results from the CARIBU facility: Mass measurements on the r-process path

J. Van Schelt*, D. Lascar, G. Savard, J. A. Clark, P. F. Bertone, S. Caldwell, A. Chaudhuri, A. F. Levand, G. Li, G. E. Morgan, R. Orford, R. E. Segel, K. S. Sharma, M. G. Sternberg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


The Canadian Penning Trap mass spectrometer has made mass measurements of 33 neutron-rich nuclides provided by the new Californium Rare Isotope Breeder Upgrade facility at Argonne National Laboratory. The studied region includes the Sn132 double shell closure and ranges in Z from In to Cs, with Sn isotopes measured out to A=135, and the typical measurement precision is at the 100 ppb level or better. The region encompasses a possible major waiting point of the astrophysical r process, and the impact of the masses on the r process is shown through a series of simulations. These first-ever simulations with direct mass information on this waiting point show significant increases in waiting time at Sn and Sb in comparison with commonly used mass models, demonstrating the inadequacy of existing models for accurate r-process calculations.

Original languageEnglish (US)
Article number061102
JournalPhysical review letters
Issue number6
StatePublished - Aug 5 2013

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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