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

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

2012-03-20

arxiv.org/abs/1203.4470v2

Phys. Rev. C 85, 045805 (2012)

Physics

Nuclear Physics

Nuclear Experiment

15 pages, 16 figures. v2 updated, published in Physical Review C

Scientific paper

10.1103/PhysRevC.85.045805

The masses of 40 neutron-rich nuclides from Z = 51 to 64 were measured at an average precision of $\delta m/m= 10^{-7}$ using the Canadian Penning Trap mass spectrometer at Argonne National Laboratory. The measurements, of fission fragments from a $^{252}$Cf 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 $\beta$-endpoint measurements. Differences in mass excess from the 2003 Atomic Mass Evaluation of up to 400 keV are seen, as well as systematic disagreement with various mass models.

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