The Pt isotopes: Comparing the Interacting Boson Model with configuration mixing and the extended consistent-Q formalism

Abstract

The role of intruder configurations in the description of energy spectra and B(E2) values in the Pt region is analyzed. In particular, we study the differences between Interacting Boson Model calculations with or without the inclusion of intruder states in the even Pt nuclei 172−194 Pt. As a result, it shows that for the description of a subset of the existing experimental data, i.e., energy spectra and absolute B(E2) values up to an excitation energy of about 1.5 MeV, both approaches seem to be equally valid. We explain these similarities between both model spaces through an appropriate mapping. We point out the need for a more extensive comparison, encompassing a data set as broad (and complete) as possible to confront with both theoretical approaches in order to test the detailed structure of the nuclear wave functions. 21.60.Fw. PACS

Effects of deformation on theβ-decay patterns of light even-even and odd-mass Hg and Pt isotopes

“…In this case mixing can be important, affecting B(E2) strengths and their corresponding β deformation parameters. The basic picture is also confirmed from recent calculations within the interacting boson model with configuration mixing carried out for Hg [25,26] and Pt [27][28][29][30] isotopes.…”

Lifetime measurements in182,186Pt

“…3 [18,19], supporting a band-mixing interpretation of this B(E2) increase at low spins in these nuclei.…”

“…The shape-coexistence picture in the Pt nuclei has engendered extensive theoretical interest in recent years [15][16][17][18][19]. In particular, there has been a controversy regarding whether shape evolution in the Pt isotopes involves intruder states [17][18][19], or can be understood without invoking the intruder states [15,16].…”

“…In particular, there has been a controversy regarding whether shape evolution in the Pt isotopes involves intruder states [17][18][19], or can be understood without invoking the intruder states [15,16]. Most recently, García-Ramos et al [19] have established that configuration-mixing is an essential feature of these nuclei, although it is not apparent when considering only a limited set of data; they termed this "concealed configuration mixing" and have suggested further spectroscopic measurements where this mixing might be clearly revealed.…”

Collective structural evolution in neutron-rich Yb, Hf, W, Os, and Pt isotopes

“…There are a number of works aimed at understanding the shape coexistence phenomenon in this region in terms of both EDF-based microscopic calculations [36,64,65] and phenomenological models [66][67][68].…”