94 {beta}-Decay Half-Lives of Neutron-Rich 55Cs to 67Ho: Experimental Feedback and Evaluation of the r-Process Rare-Earth Peak Formation

Wu, J.; Nishimura, S.; Lorusso, G.; Moller, P; Ideguchi, E; Regan, P. H.; Simpson, G. S.; Soderstrom, P. -A.; Walker, P. M.; Watanabe, H.; Kondev, F. G.

doi:10.1103/PhysRevLett.118.072701

Title: 94 {beta}-Decay Half-Lives of Neutron-Rich 55Cs to 67Ho: Experimental Feedback and Evaluation of the r-Process Rare-Earth Peak Formation

Journal Article · Fri Feb 17 00:00:00 EST 2017 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.118.072701· OSTI ID:1345511

Wu, J.; Nishimura, S.; Lorusso, G.; Moller, P; Ideguchi, E; Regan, P. H.; Simpson, G. S.; Soderstrom, P. -A.; Walker, P. M.; Watanabe, H.; Kondev, F. G.

The β-decay half-lives of 94 neutron-rich nuclei^144$$-$$151Cs, ^146$$-$$154Ba, ^148$$-$$156La, ^150$$-$$158Ce, ^153$$-$$160Pr, ^156$$-$$162Nd, ^159$$-$$163Pm, ^160$$-$$166Sm, ^161$$-$$168Eu, ^165$$-$$170Gd, ^166$$-$$172Tb, ^169$$-$$173Dy, ^172$$-$$175Ho, and two isomeric states ^174mEr, ^172mDy were measured at the Radioactive Isotope Beam Factory, providing a new experimental basis to test theoretical models. Strikingly large drops of β-decay half-lives are observed at neutron-number N = 97 for ₅₈Ce, ₅₉Pr, ₆₀Nd, and ₆₂Sm, and N = 105 for ₆₃Eu, ₆₄Gd, ₆₅Tb, and ₆₆Dy. Lastly, features in the data mirror the interplay between pairing effects and microscopic structure. r-process network calculations performed for a range of mass models and astrophysical conditions show that the 57 half-lives measured for the first time play an important role in shaping the abundance pattern of rare-earth elements in the solar system

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

Sponsoring Organization:: USDOE Office of Science - Office of Nuclear Physics; National Research Foundation of Korea (NRF); Japan Society for the Promotion of Science (JSPS) - KAKENHI; National Aeronautics and Space Administration (NASA)

DOE Contract Number:: AC02-06CH11357; AC52-06NA25396; NNX10AH78G; NRF-2013R1A1A2063017; NRF-2016 R1A5A1013277; NRF-2009-0093817; NRF-2015R1D1A1A01056918

OSTI ID:: 1345511

Journal Information:: Physical Review Letters, Vol. 118, Issue 7; ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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Exploring the mass surface near the rare-earth abundance peak via precision mass measurements at JYFLTRAP Vilen, M.; Kelly, J. M.; Kankainen, A. Physical Review C, Vol. 101, Issue 3 https://doi.org/10.1103/physrevc.101.034312	journal	March 2020
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Precision Mass Measurements on Neutron-Rich Rare-Earth Isotopes at JYFLTRAP: Reduced Neutron Pairing and Implications for $r$ -Process Calculations Vilen, M.; Kelly, J. M.; Kankainen, A. Physical Review Letters, Vol. 120, Issue 26 https://doi.org/10.1103/physrevlett.120.262701	journal	June 2018
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. Physical Review Letters, Vol. 120, Issue 26 https://doi.org/10.1103/physrevlett.120.262702	journal	June 2018
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Precision mass measurements on neutron-rich rare-earth isotopes at JYFLTRAP - reduced neutron pairing and implications for the $r$-process calculations Vilen, M.; Kelly, J. M.; Kankainen, A. arXiv https://doi.org/10.48550/arxiv.1801.08940	text	January 2018
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