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First Measurement of Several β-Delayed Neutron Emitting Isotopes Beyond N=126.

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journal contribution
posted on 16.05.2018, 14:16 by R. Caballero-Folch, C. Domingo-Pardo, J. Agramunt, A. Algora, F. Ameil, A. Arcones, Y. Ayyad, J. Benlliure, I. N. Borzov, M. Bowry, F. Calviño, D. Cano-Ott, G. Cortés, 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, Y. A. Litvinov, L. Maier, J. Marganiec, T. Marketin, M. Marta, T. Martínez, G. Martínez-Pinedo, F. Montes, I. Mukha, D. R. Napoli, C. Nociforo, C. Paradela, S. Pietri, Z. Podolyák, A. Prochazka, S. Rice, A. Riego, B. Rubio, H. Schaffner, C. 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. Woods, A. Yeremin
The β-delayed neutron emission probabilities of neutron rich Hg and Tl nuclei have been measured together with β-decay half-lives for 20 isotopes of Au, Hg, Tl, Pb, and Bi in the mass region N≳126. These are the heaviest species where neutron emission has been observed so far. These measurements provide key information to evaluate the performance of nuclear microscopic and phenomenological models in reproducing the high-energy part of the β-decay strength distribution. This provides important constraints on global theoretical models currently used in r-process nucleosynthesis.


This work was supported by the Spanish Ministerio de Economia y Competitividad under Grants No. SEV-2014-0398, No. FPA2011-24553, No. FPA2011-28770-C03-03, No. FPA2014-52823-C2-1-P, and No. AIC-D-2011-0705, the Spanish Nuclear Security Council (CSN) under a grant of Catedra Argos, by the German Helmholtz Association via the Young Investigators Grant No. VH-NG 627 and the Nuclear Astrophysics Virtual Institute (VH-VI-417), and by the German Bundesministerium für Bildung und Forschung under No. 06MT7178 / 05P12WOFNF. UK authors acknowledge the support of the UK Science & Technology Facilities Council. Yu. A. L. acknowledges support from Helmholtz-CAS Joint Research Group (HCJRG-108). I. N. B. acknowledges support from the Russian Science Foundation (Grant No. RSF-16-12-1016).



Physical Review Letters, 2016, 117, 012501

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