Nuclear Data Sheets for A = 26

Abstract

Evaluated spectroscopic data and level schemes from radioactive decay and nuclear reaction studies are presented for 26O, 26F, 26Ne, 26Na, 26Mg, 26Al, 26Si, 26P, and 26S. This evaluation for A = 26 supersedes the earlier one by P. M. Endt (1998En04) and updates for some nuclides in ENSDF.Highlights of this evaluation are the following:This evaluation includes search results for 26S nuclide and its proton–decay mode (2011Fo08).An isomeric state (2.2 ms) in 26F has been discovered by 2013Le03. The state is proposed at 643.4 keV 1 from γ–ray measurements. Internal-transition and beta-decay branches for the state are also determined. New excited levels in 26Ne have been identified from 26F β− decay (2.2 ms).For some 26Si resonance states conflicting spin-parity assignments exist in the literature. These are identified by footnotes. 2015Do07 (3He,nγ) propose the first 0+ state above proton separation energy at an excitation energy of 5890 keV and suggested for additional independent measurements to confirm or refute the existence of 5946 keV 4. 2016Ch09 consider 5946 keV level as a distinct excited state in their reanalysis of the literature data with possible spin-parity assignment of 0+ or 4+This evaluation also includes discovery of an isomeric state, at 164.1 keV 1, in 26P by 2014NiZZ.