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

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 04:00:00 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

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

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

DOE Contract Number:: AC02-06CH11357; AC52-06NA25396

OSTI ID:: 1345511

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

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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