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

par John, Philipp Rudolf;Valiente-Dobon, J.J.;Mengoni, D;Lunardi, S.;Bazzacco, D.;Gadea, A;Wheldon, C;Rodriguez, T.R.;Alexander, T;De Angelis, G.;Ashwood, N.;Barr, M;Benzoni, Giovanna;Birkenbach, B;Bizzetti, PG;Bizzetti-Sona, AM;Bottoni, S.;Bowry, M;Bracco, Angela;Browne, F;Bunce, M;Camera, F.;Corradi, Lorenzo;Crespi, Fabio Celso Luigi;Melon, Barbara;Farnea, E.;Fioretto, E.;Gottardo, A;Grente, L;Hess, H;Kokalova, Tz;Korten, W.;Kusoglu, A;Lenzi, S.M.;Leoni, S.;Ljungvall, J;Menegazzo, R.;Michelagnoli, C;Mijatovic, T.;Montagnoli, G.;Montanari, D;Napoli, D R;Podolyak, Zs.;Pollarolo, G;Recchia, F;Reiter, P.;Roberts, Oliver O.J.;Sahin, Esin;Salsac, M-.D;Scarlassara, Fernando;Sferrazza, Michele ;Soderstrom, P.-A.;Stefanini, A.M.;Szilner, Suzana;Ur, C.A.;Vogt, A;Walshe, J.; [et al.]
Référence Physical Review C, 95, 6, 064321
Publication Publié, 2017-06

Article révisé par les pairs

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Résumé :

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.