Mass measurements near the r-process path using the Canadian Penning Trap mass spectrometer
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 400 keV are seen, as well as systematic disagreement with various mass models.
- Publication:
-
Physical Review C
- Pub Date:
- April 2012
- DOI:
- 10.1103/PhysRevC.85.045805
- arXiv:
- arXiv:1203.4470
- Bibcode:
- 2012PhRvC..85d5805V
- Keywords:
-
- 21.10.Dr;
- 27.60.+j;
- 27.70.+q;
- 26.30.Hj;
- Binding energies and masses;
- 90<
- =A<
- =149;
- 150<
- =189;
- r-process;
- Nuclear Experiment
- E-Print:
- 15 pages, 16 figures. v2 updated, published in Physical Review C