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β -decay half-lives and β -delayed neutron emission probabilities for several isotopes of Au, Hg, Tl, Pb, and Bi, beyond N=126

R. Caballero-Folch, C. Domingo-Pardo, J. Agramunt, A. Algora, F. Ameil, Y. Ayyad, J. Benlliure, M. Bowry, F. Calviño, D. Cano-Ott, G. Cortès, T. Davinson (+49 others)
2017 Physical Review C  

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2017 pre-print
arXiv:1701.03845v1 fatcat:tu6i6dsgefgqblf6vfpdx7per4
Previous measurements of β-delayed neutron emitters comprise around 230 nuclei, spanning from the ^8He up to ^150La. Apart from ^210Tl, with a minuscule branching ratio of 0.007%, no other neutron emitter is measured yet beyond A=150. Therefore new data are needed, particularly in the heavy mass region around N=126, in order to guide theoretical models and to understand the formation of the third r-process peak at A∼195. Purpose: To measure both, β-decay half-lives and neutron branching ratios
more » ... f several neutron-rich Au, Hg, Tl, Pb and Bi isotopes beyond N=126. Method: Ions of interest are produced by fragmentation of a ^238U beam, selected and identified via the GSI-FRS fragment separator. A stack of segmented silicon detectors (SIMBA) is used to measure ion-implants and β-decays. An array of 30 ^3He tubes embedded in a polyethylene matrix (BELEN) is used to detect neutrons with high efficiency and selectivity. A self-triggered digital system is employed to acquire data and to enable time-correlations. The latter are analyzed with an analytical model and results for the half-lives and neutron-branching ratios are derived using the binned Maximum-Likelihood method. Results: Twenty new β-decay half-lives are reported for ^204-206Au, ^208-211Hg,^211-216Tl,^215-218Pb and ^218-220Bi, nine of them for the first time. Neutron emission probabilities are reported for ^210,211Hg and ^211-216Tl. Conclusions: The new β-decay half-lives are in good agreement with previous measurements in this region. The measured neutron emission probabilities are comparable or smaller than values predicted by global models like RHB+RQRPA.
doi:10.1103/physrevc.95.064322 fatcat:yyo7zxaxjzhb7kerikjejquguu
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R. Caballero-Folch, C. Domingo-Pardo, J. Agramunt, A. Algora, F. Ameil, Y. Ayyad, J. Benlliure, M. Bowry, F. Calviño, D. Cano-Ott, G. Cortès, T. Davinson, I. Dillmann, A. Estrade, A. Evdokimov, T. Faestermann, F. Farinon, D. Galaviz, A. R. García, H. Geissel, W. Gelletly, R. Gernhäuser, M. B. Gómez-Hornillos, C. Guerrero, M. Heil, C. Hinke, R. Knöbel, I. Kojouharov, J. Kurcewicz, N. Kurz, Yu. A. Litvinov, L. Maier, J. Marganiec, M. Marta, T. Martínez, F. Montes, I. Mukha, D. R. Napoli, C. Nociforo, C. Paradela, S. Pietri, Zs. Podolyák, A. Prochazka, S. Rice, A. Riego, B. Rubio, H. Schaffner, Ch. Scheidenberger, K. Smith, E. Sokol, K. Steiger, B. Sun, J. L. Taín, M. Takechi, D. Testov, H. Weick, E. Wilson, J. S. Winfield, R. Wood, P. J. Woods, A. Yeremin. "β -decay half-lives and β -delayed neutron emission probabilities for several isotopes of Au, Hg, Tl, Pb, and Bi, beyond N=126." Physical Review C 95.6 (2017)