Half-life systematics across the N = 126 shell closure: role of first-forbidden transitions in the Β decay of heavy neutron-rich nuclei

A.I. Morales, J. Benlliure, T. Kurtukian-Nieto, K. Schmidt, S. Verma, P.H. Regan, Zs. Podolyak, M. Gorska, S. Pietri, R. Kumar, E. Casarejos, N. Al-Dahan, A. Algora, N. Alkhomashi, H. Àlvarez-Pol, G. Benzoni, A. Blazhev, P. Boutachkov, Alison Bruce, L. CáceresI.J. Cullen, Ana M. Denis Bacelar, P. Doornenbal, M.E. Estévez-Aguado, G.F. Farrelly, Y. Fujita, A.B. Garnsworthy, W. Gelletly, J. Gerl, J. Grebosz, R. Hoischen, I. Kojouharov, N. Kurz, S. Lalkovski, Z. Liu, C. Mihai, F. Molina, D. Mücher, B. Rubio, H. Shaffner, S.J. Steer, A. Tamii, S. Tashenov, J.J. Valiente-Dobon, P.M. Walker, H.J. Wollersheim, P.J. Woods

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Abstract

This Letter reports on a systematic study of β-decay half-lives of neutron-rich nuclei around doubly magic Pb208. The lifetimes of the 126-neutron shell isotone Pt204 and the neighboring Ir200-202, Pt203, Au204 are presented together with other 19 half-lives measured during the "stopped beam" campaign of the rare isotope investigations at GSI collaboration. The results constrain the main nuclear theories used in calculations of r-process nucleosynthesis. Predictions based on a statistical macroscopic description of the first-forbidden β strength reveal significant deviations for most of the nuclei with N<126. In contrast, theories including a fully microscopic treatment of allowed and first-forbidden transitions reproduce more satisfactorily the trend in the measured half-lives for the nuclei in this region, where the r-process pathway passes through during β decay back to stability.
Original languageEnglish
JournalPhysical Review Letters
Volume113
DOIs
Publication statusPublished - 11 Jul 2014

Keywords

  • B-decay
  • half-life systematics
  • shell-closure
  • nucleosynthesis

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    Morales, A. I., Benlliure, J., Kurtukian-Nieto, T., Schmidt, K., Verma, S., Regan, P. H., Podolyak, Z., Gorska, M., Pietri, S., Kumar, R., Casarejos, E., Al-Dahan, N., Algora, A., Alkhomashi, N., Àlvarez-Pol, H., Benzoni, G., Blazhev, A., Boutachkov, P., Bruce, A., ... Woods, P. J. (2014). Half-life systematics across the N = 126 shell closure: role of first-forbidden transitions in the Β decay of heavy neutron-rich nuclei. Physical Review Letters, 113. https://doi.org/10.1103/PhysRevLett.113.022702