2006Dv01, 2008Dv02: ²⁶⁶Sg produced as α-daughter of ²⁷⁰Hs, which was formed in ²⁴⁸Cm(²⁶Mg,4n),E=193,185 MeV reaction at GSI, and assignment to the isotope made through the observation of four correlated (α-SF) decay chains in 2006Dv01, and two in 2008Dv02 which were attributed to ²⁷⁰Hs on the basis of α-SF correlations. These studies negated the discovery of ²⁶⁶Sg, published in several articles (2003Tu05, 2003Du27, 2002Du21, 2001Hu22, 1998Tu01, 1997Sc48, 1997Sc49 from the GSI group; and 1995Og02, 1994La22, 1994Lo27, 1994La22, 1994Og04 from the Dubna-LLNL group), and assigned the events in these earlier studies to ²⁶⁹Hs decaying by α decay to ²⁶⁵Sg, which also decays partially by α. See ²⁷⁰Hs Adopted Levels for history of six correlated decay chains observed in the above two works.

2013Og03: ²⁶⁶Sg produced as α-daughter of ²⁷⁰Hs isotope, which was formed in ²²⁶Ra(⁴⁸Ca,4n) reaction E(⁴⁸Ca)=229, 234, 241 MeV at Dubna. This study confirmed conclusions of the GSI experiments by 2006Dv01 and 2008Dv02. See ²⁷⁰Hs Adopted Levels for history of six correlated decay chains observed by 2013Og03.

Earlier studies where either direct production of ²⁶⁶Sg or through the α decay of ²⁷⁰Hs was claimed in the first experiments at Dubna, and later at GSI, but later these activities were reassigned to ²⁶⁵Sg or ²⁶⁹Hs by 2006Dv01 and 2008Dv02 at GSI, and confirmed in 2013Og03 at Dubna. The following studies are listed here only from the historical perspective of search for ²⁶⁶Sg during 1994-2004 at Dubna and GSI.

1994La22 (also 1994Lo27, 1994Og04, 1995Og02): ²⁴⁸Cm(²²Ne,4n), E=116,121 MeV at Dubna. Six α-SF correlated events were reported. The α-decay half-life of ²⁶⁶Sg was suggested as 10-30 s, with α decay as the primary mode (%α|>50), Eα=8.63 MeV 5.

1997Sc48, 1997Sc49, 1998Tu01: ²⁴⁸Cm(²²Ne,4n),E=121 MeV at GSI using UNILAC accelerator and On-Line Gas chemistry Apparatus (OLGA). Four α-SF decay chains were assigned to the decay of ²⁶⁶Sg. The α-decay half-life of ²⁶⁶Sg was reported as 21 s +20-12, with Eα=8.77 MeV 4, and the decay of ²⁶⁶Sg through α and SF modes.

2001Hu22: chemistry-related experiments at GSI using the same reaction as in 1998Tu01. Two decay chains reported with α-decay half-life of 21.1 s and Eα=8.66 and 8.70 MeV.

2002Du21, 2003Du27, 2003Tu05 (also 2003Kr24 review): two α-α-SF correlated decay chains (²⁷⁰Hs |) ²⁶⁶Sg |) ²⁶²Rf) were reported using the ²⁴⁸Cm(²⁶Mg,4n),E=143.7-146.8 MeV reaction and chemistry techniques at GSI.

2004Vo24: this experiment reports mainly the chemistry of Z=108 (Hs) element through the formation of ²⁶⁹Hs or ²⁷⁰Hs in ²⁴⁸Cm(²⁶Mg,4n) at GSI. Three α-α-SF correlated events were assigned to the decay of ²⁶⁹Hs or ²⁷⁰Hs.

For theoretical studies, consult Nuclear Science References (NSR) database at NNDC, BNL for 105 primary references dealing with the half-lives and other aspects of nuclear structure in this mass region

Q-value: Estimated uncertainties (2017Wa10): ΔQ(β^-)=290, ΔS(n)=270, ΔS(p)=330, ΔQ(α)=100

Q-value: S(2n)=13310 370, S(2p)=7040 440 (syst, 2017Wa10).