Lifetimes of the $2^+_1$ and $4^+_1$ states of the neutron-rich nuclide $^{200}$Pt

C. M. Nickel; V. Werner; P. R. John; U. Ahmed; T. Beck; M. Boromiza; C. Clisu-Stan; A. Coman; C. Costache; N. M. Florea; K. E. Ide; A. Ionescu; R. Lică; N. M. Mărginean; R. Mărginean; A. Mitu; H. Mayr; C. Mihai; R. E. Mihai; S. Pascu; N. Pietralla; L. Stan; T. Stetz; A. E. Turturică; S. Ujeniuc; A. Weber; R. Zidarova

arXiv · 2509.20915

Lifetimes of the $2^+_1$ and $4^+_1$ states of the neutron-rich nuclide $^{200}$Pt

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Abstract

The lifetimes of the $2^+_1$ and $4^+_1$ states of $^{200}$Pt were measured applying the recoil-distance Doppler-shift method. Excited states were populated in the $^{198}$Pt($^{18}$O, $^{16}$O)$^{200}$Pt two-neutron transfer reaction at the $9\,\text{MV}$ tandem accelerator at the IFIN-HH in M\u{a}gurele, Romania. The resulting $B(E2)$ values of the $2^+_1 \rightarrow 0^+_1$ and $4^+_1 \rightarrow 2^+_1$ transitions as well as the $B_{4/2}$ ratio of $2.08(32)$ indicate the nuclear structure evolving towards sphericity when approaching the neutron shell closure at $N = 126$. The $B(E2; 2^+_1 \rightarrow 0^+_1)$ values of Pt and Hg are compared to values of Te, Xe and Ba as both regions of the nuclear chart show similar structural effects.

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C. M. Nickel, V. Werner, P. R. John, U. Ahmed, T. Beck, M. Boromiza, C. Clisu-Stan, A. Coman, C. Costache, N. M. Florea, K. E. Ide, A. Ionescu, R. Lică, N. M. Mărginean, R. Mărginean, A. Mitu, H. Mayr, C. Mihai, R. E. Mihai, S. Pascu, N. Pietralla, L. Stan, T. Stetz, A. E. Turturică, S. Ujeniuc, A. Weber, R. Zidarova. 2025-09-25. Lifetimes of the $2^+_1$ and $4^+_1$ states of the neutron-rich nuclide $^{200}$Pt. https://arxiv.org/abs/2509.20915

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