Abstract
Excited states in the extremely neutron-deficient nucleus Te107 have been identified from two separate experiments using the recoil-decay tagging technique. Two connected structures were observed on the basis of γγ-coincidence relations and tentatively assigned as built on the mixed-parentage νg7/2d5/2 and νh11/2 intruder configurations. The observed structures were compared with large-scale shell-model calculations and total Routhian surface calculations. Collective behavior was discovered to persist in the νh11/2 band of Te107 which highlights the shape-polarizing effect of a single valence neutron occupying the h11/2 intruder orbit as the N=50 shell closure is approached.1 MoreReceived 31 August 2021Accepted 22 November 2021DOI:https://doi.org/10.1103/PhysRevC.104.064305Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by Bibsam.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasCollective levelsElectromagnetic transitionsEnergy levels & level densitiesNuclear structure & decaysProperties90 ≤ A ≤ 149Nuclear Physics
Highlights
The structures of nuclei close to the presumed doubly magic nucleus 100Sn have been the subject of numerous experimental and theoretical studies during the past two decades [1]
We report a new spectroscopic study of 107Te, which significantly extends the limited information on the excited states of 107Te reported previously [18]
Energy spectra for the prompt γ rays recorded at the target position in delayed coincidence with detected recoils in the double-sided silicon strip detectors (DSSDs) from both experiments are shown in Figs. 1(a) and 1(c), respectively
Summary
The structures of nuclei close to the presumed doubly magic nucleus 100Sn have been the subject of numerous experimental and theoretical studies during the past two decades [1]. The region of nuclei with a few particles outside the 100Sn core, in particular, provides a special “laboratory” for the observation of the competition between single-particle and collective degrees of freedom. In this region, a small change in the number of valence particles can introduce dramatic changes in the nuclear structure
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