In-beam gamma-ray spectroscopy of the neutron-rich platinum isotope Pt-200 toward the N=126 shell gap
Date
2017Author
Birkenbach, B.
Crespi, F. C. L.
Melon, B.
Farnea, E.
Fioretto, E.
Gottardo, A.
Grente, L.
Hess, H.
Kokalova, Tz.
Korten, W.
Lenzi, S.
Leoni, S.
Ljungvall, J.
Menegazzo, R.
Michelagnoli, C.
Mijatovic, T.
Montagnoli, G.
Napoli, D. R.
Podolyak, Zs.
Pollarolo, G.
Recchia, F.
Reiter, P.
Roberts, O. J.
Sahin, E.
Salsac, M. -D.
Montanari, D.
John, P. R.
Valiente-Dobon, J. J.
Mengoni, D.
Modamio, V.
Lunardi, S.
Bazzacco, D.
Gadea, A.
Wheldon, C.
Rodriguez, T. R.
Alexander, T.
de Angelis, G.
Ashwood, N.
Barr, M.
Benzoni, G.
Bizzeti, P. G.
Bizzeti-Sona, A. M.
Bottoni, S.
Bowry, M.
Bracco, A.
Browne, F.
Bunce, M.
Scarlassara, F.
Sferrazza, M.
Soderstrom, P. -A.
Stefanini, A. M.
Szilner, S.
Ur, C. A.
Vogt, A.
Walshe, J.
Kusoglu, Aslı
Camera, F.
Corradi, L.
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Show full item recordAbstract
The neutron-rich nucleus Pt-200 is investigated via in-beam gamma-ray spectroscopy to study the shape evolution in the neutron-rich platinum isotopes towards the N = 126 shell closure. The two-neutron transfer reaction Pt-198(Se-82, Se-80)Pt-200 is used to populate excited states of Pt-200. The Advanced Gamma Ray Tracking Array (AGATA) demonstrator coupled with the PRISMA spectrometer detects gamma rays coincident with the Se-80 recoils, the binary partner of Pt-200. The binary partner method is applied to extract the gamma-ray transitions and build the level scheme of Pt-200. 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 (6(1)(+)) state. An additional gamma ray was found and it presumably deexcites the (8(1)(+)) state. The results are compared with state-of-the-art beyond mean-field calculations, performed for the even-even Pt190-204 isotopes, revealing that Pt-200 marks the transition from the gamma-unstable behavior of lighter Pt nuclei towards a more spherical one when approaching the N = 126 shell closure.
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