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. Kurtukián-Nieto, K. H. Schmidt, S. Verma, P. H. Regan, Z. Podolyák, M. Górska, S. Pietri, R. Kumar, E. Casarejos, N. Al-Dahan, A. Algora, N. Alkhomashi, H. Álvarez-Pol, G. Benzoni, A. Blazhev, P. Boutachkov, A. M. Bruce, L. S. CáceresI. J. Cullen, A. M. Denis Bacelar, P. Doornenbal, M. E. Estévez-Aguado, G. 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-Dobón, 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
Article number022702
JournalPhysical review letters
Volume113
Issue number2
DOIs
Publication statusPublished - Jul 11 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Morales, A. I., Benlliure, J., Kurtukián-Nieto, T., Schmidt, K. H., Verma, S., Regan, P. H., Podolyák, Z., Górska, M., Pietri, S., Kumar, R., Casarejos, E., Al-Dahan, N., Algora, A., Alkhomashi, N., Álvarez-Pol, H., Benzoni, G., Blazhev, A., Boutachkov, P., Bruce, A. M., ... 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(2), [022702]. https://doi.org/10.1103/PhysRevLett.113.022702