Precision Mass Measurements of Neutron-Rich Neodymium and Samarium Isotopes and Their Role in Understanding Rare-Earth Peak Formation

Orford, R.; Vassh, N.; Clark, J. A.; McLaughlin, G. C.; Mumpower, M. R.; Savard, G.; Surman, R.; Aprahamian, A.; Buchinger, F.; Burkey, M. T.; Gorelov, D. A.; Hirsh, T. Y.; Klimes, J. W.; Morgan, G. E.; Nystrom, A.; Sharma, K. S.

doi:10.1103/PhysRevLett.120.262702

Title: Precision Mass Measurements of Neutron-Rich Neodymium and Samarium Isotopes and Their Role in Understanding Rare-Earth Peak Formation

Journal Article · Fri Jun 01 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.120.262702· OSTI ID:1467432

Orford, R.; Vassh, N.; Clark, J. A.; McLaughlin, G. C.; Mumpower, M. R.; Savard, G.; Surman, R.; Aprahamian, A.; Buchinger, F.; Burkey, M. T.; Gorelov, D. A.; Hirsh, T. Y.; Klimes, J. W.; Morgan, G. E.; Nystrom, A.; Sharma, K. S.

The Canadian Penning Trap mass spectrometer at the Californium Rare Isotope Breeder Upgrade (CARIBU) facility was used to measure the masses of eight neutron-rich isotopes of Nd and Sm. These measurements are the first to push into the region of nuclear masses relevant to the formation of the rare-earth abundance peak at A similar to 165 by the rapid neutron-capture process. We compare our results with theoretical predictions obtained from "reverse engineering" the mass surface that best reproduces the observed solar abundances in this region through a Markov chain Monte Carlo technique. Our measured masses are consistent with the reverse-engineering predictions for a neutron star merger wind scenario.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1467432

Journal Information:: Physical Review Letters, Vol. 120, Issue 26; ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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