Masses and β -Decay Spectroscopy of Neutron-Rich Odd-Odd Eu160,162 Nuclei: Evidence for a Subshell Gap with Large Deformation at N=98

Hartley, D. J.; Kondev, F. G.; Orford, R.; Clark, J. A.; Savard, G.; Ayangeakaa, A. D.; Bottoni, S.; Buchinger, F.; Burkey, M. T.; Carpenter, M. P.; Copp, P.; Gorelov, D. A.; Hicks, K.; Hoffman, C. R.; Hu, C.; Janssens, R. V.  F.; Klimes, J. W.; Lauritsen, T.; Sethi, J.; Seweryniak, D.; Sharma, K. S.; Zhang, H.; Zhu, S.; Zhu, Y.

doi:10.1103/PhysRevLett.120.182502

Title: Masses and $β$ -Decay Spectroscopy of Neutron-Rich Odd-Odd ${}^{160, 162}{Eu}$ Nuclei: Evidence for a Subshell Gap with Large Deformation at $N = 98$

Journal Article · Tue May 01 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.120.182502· OSTI ID:1461449

Hartley, D. J.; Kondev, F. G.; Orford, R.; Clark, J. A.; Savard, G.; Ayangeakaa, A. D.; Bottoni, S.; Buchinger, F.; Burkey, M. T.; Carpenter, M. P.; Copp, P.; Gorelov, D. A.; Hicks, K.; Hoffman, C. R.; Hu, C.; Janssens, R. V. F.; Klimes, J. W.; Lauritsen, T.; Sethi, J.; Seweryniak, D. more »

The structure of deformed neutron-rich nuclei in the rare-earth region is of significant interest for both the astrophysics and nuclear structure fields. At present, a complete explanation for the observed peak in the elemental abundances at A similar to 160 eludes astrophysicists, and models depend on accurate quantities, such as masses, lifetimes, and branching ratios of deformed neutron-rich nuclei in this region. Unusual nuclear structure effects are also observed, such as the unexpectedly low energies of the first 2(+) levels in some even-even nuclei at N = 98. In order to address these issues, mass and beta-decay spectroscopy measurements of the Eu-160(97) and Eu-162(99) nuclei were performed at the Californium Rare Isotope Breeder Upgrade radioactive beam facility at Argonne National Laboratory. Evidence for a gap in the single-particle neutron energies at N = 98 and for large deformation (beta(2) similar to 0.3) is discussed in relation to the unusual phenomena observed at this neutron number.

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

Sponsoring Organization:: USDOE Office of Science - Office of Nuclear Physics; Natural Sciences and Engineering Research Council of Canada (NSERC)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1461449

Journal Information:: Physical Review Letters, Vol. 120, Issue 18; ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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Title: Masses and $β$ -Decay Spectroscopy of Neutron-Rich Odd-Odd ${}^{160, 162}{Eu}$ Nuclei: Evidence for a Subshell Gap with Large Deformation at $N = 98$