Authors: C.D. Nesaraja, E.A. Mccutchan |  Citation: Nucl. Data Sheets 121, 695 (2014) |  Cutoff date: 30-Sep-2013 

 Full ENSDF file | Adopted Levels (PDF version) 

S(n)= 7107 keV SYS(p)= 2726 keV SYQ(α)= 8.69×103 keV 5
Reference: 2012WA38

General Comments:

1981Mu12: first identification using 206Pb(40Ar,3n) with E(40Ar)=194 MeV. Assignment of 8546-MeV α activity to 243Fm was made based on the arguments that 40Ar bombarding energy was chosen to maximize for 3n channel, and that the observed α activity could not be assigned to any other nucleus.

2008Kh10: 206Pb(40Ar,3n) with E(40Ar)=180-204 MeV. Evaporation residues (Er) separated with the velocity filter SHIP and implanted into a position-sensitive Si detector. Fm isotopes identified through tof and Er-α and Er-SF correlations. Measured Eα, Iα, Er-α(t), Er-SF(t) using 7 position-sensitive Si detectors (implantation detector and 6 additional Si detectors mounted in the backward hemisphere); deduced T1/2 and branching. γ-rays measured with an HPGe clover detector; no isomers were identified.

Theoretical calculations:

2013Zd01: T1/2 for α decay calculated with phenomenological model based on Gamow theory with WKB approximation for Coulomb barrier penetration .

2011Ad15: calculations for one-quasi particle states

2001Mo07: calculations of T1/2 for α decay

1985Cw01: fission barrier calculations

1984Ga06: calculations of fusion barrier for the (206Pb + 40Ar) system.

1982Il01: calculations of 206Pb(40Ar,3n)243Fm production cross sections

1978Po09: calculations of spontaneous fission half-lives

1975Te01: T1/2(SF) estimated from data on fission activities following the 206Pb(40Ar,xn) reaction and calculated excitation functions.

1973Ta30: partial half-life for T1/2(ε decay) calculated from β gross theory.

Q-value: ΔS(n)=455; ΔS(p)=334 (2012Wa38).

Q-value: S(2n)=15905 syst 368; S(2p)=4541 syst 272; Q(εp)=2688 syst 216 (2012Wa38)

Jπ(level) T1/2(level)
  0.0 (7/2-) 231 ms 9 
% α = 91 3
% SF = 9 1
% ε < 10

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Additional Level Data and Comments:


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