期刊
PHYSICAL REVIEW C
卷 85, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.85.045805
关键词
-
资金
- NSERC, Canada [216974]
- US Department of Energy, Office of Nuclear Physics [DE-AC02-06CH11357, DE-FG02-91ER-40609, DE-FG02-98ER41086, DE-AC52-07NA27344]
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 Cf-252 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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