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

Author(s) 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.
Journal Phys Rev Lett
Date Published 2018 Jun 29
Abstract

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∼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.

DOI 10.1103/PhysRevLett.120.262702
ISSN 1079-7114
Citation Orford R, Vassh N, Clark JA, McLaughlin GC, Mumpower MR, Savard G, et al. Precision Mass Measurements of Neutron-Rich Neodymium and Samarium Isotopes and Their Role in Understanding Rare-Earth Peak Formation. Phys Rev Lett. 2018;120(26):262702.

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