The neutron-rich nucleus Pt200 is investigated via in-beam Î³-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 Î³ rays coincident with the Se80 recoils, the binary partner of Pt200. The binary partner method is applied to extract the Î³-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 Î³ 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 Î³-unstable behavior of lighter Pt nuclei towards a more spherical one when approaching the N=126 shell closure.
|Titolo:||In-beam Î³ -ray spectroscopy of the neutron-rich platinum isotope Pt 200 toward the N=126 shell gap|
|Parole Chiave:||nuclear and high energy physics|
|Settore Scientifico Disciplinare:||Settore FIS/01 - Fisica Sperimentale|
|Data di pubblicazione:||giu-2017|
|Digital Object Identifier (DOI):||10.1103/PhysRevC.95.064321|
|Appare nelle tipologie:||01 - Articolo su periodico|