In-beam γ -ray spectroscopy of the neutron-rich platinum isotope Pt 200 toward the N=126 shell gap

P. R. John*, J. J. Valiente-Dobón, D. Mengoni, V. Modamio, S. Lunardi, D. Bazzacco, A. Gadea, C. Wheldon, T. R. Rodríguez, T. Alexander, G. De Angelis, N. Ashwood, M. Barr, G. Benzoni, B. Birkenbach, P. G. Bizzeti, A. M. Bizzeti-Sona, S. Bottoni, M. Bowry, A. BraccoF. Browne, M. Bunce, F. Camera, L. Corradi, F. C.L. Crespi, B. Melon, E. Farnea, E. Fioretto, A. Gottardo, L. Grente, H. Hess, Tz Kokalova, W. Korten, A. Kuşoǧlu, S. Lenzi, S. Leoni, J. Ljungvall, R. Menegazzo, C. Michelagnoli, T. Mijatović, G. Montagnoli, D. Montanari, D. R. Napoli, Zs Podolyák, G. Pollarolo, F. Recchia, P. Reiter, O. J. Roberts, E. Şahin, M. D. Salsac, F. Scarlassara, M. Sferrazza, P. A. Söderström, A. M. Stefanini, S. Szilner, C. A. Ur, A. Vogt, J. Walshe

*Corresponding author for this work

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The neutron-rich nucleus Pt200 is investigated via in-beam γ-ray spectroscopy to study the shape evolution in the neutron-rich platinum isotopes towards the N=126 shell closure. The two-neutron transfer reaction Pt198(Se82, Se80)Pt200 is used to populate excited states of Pt200. The Advanced Gamma Ray Tracking Array (AGATA) demonstrator coupled with the PRISMA spectrometer detects γ rays coincident with the Se80 recoils, the binary partner of Pt200. The binary partner method is applied to extract the γ-ray transitions and build the level scheme of Pt200. The level at 1884 keV reported by Yates et al. [S. W. Yates, E. M. Baum, E. A. Henry, L. G. Mann, N. Roy, A. Aprahamian, R. A. Meyer, and R. Estep, Phys. Rev. C 37, 1889 (1988)] was confirmed to be at 1882.1 keV and assigned as the (61+) state. An additional γ ray was found and it presumably deexcites the (81+) state. The results are compared with state-of-the-art beyond mean-field calculations, performed for the even-even 190-204Pt isotopes, revealing that Pt200 marks the transition from the γ-unstable behavior of lighter Pt nuclei towards a more spherical one when approaching the N=126 shell closure.

Original languageEnglish
Article number064321
JournalPhysical Review C
Issue number6
Publication statusPublished - 22 Jun 2017

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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