ADOPTED LEVELS for 265Hs

Author: Agda Artna-cohen |  Citation: Nucl. Data Sheets 88, 155 (1999) |  Cutoff date: 31-Jul-1999 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-5.8×103 keV SYS(n)= 6.73×103 keV 4S(p)= 2.45×103 keV SYQ(α)= 10470 keV 16
Reference: 2012WA38

References:
  A  26910 α decay 

General Comments:

Calculations, compilations:

Favored α decay: 1993Bu09

g.s. properties: 1997Mo25, 1995Mo29

Pion emission: 1991Io03

Single-particle Nilsson levels: 1994Cw02

1994Cw02 calculate the following single-particle level sequence: g.s. 7/2[613], 0.00 MeV 3/2[622], 0.01 MeV 11/2[725], 0.02 MeV 1/2[620], 0.09 MeV 9/2[615], 0.90 MeV 9/2[734].

Assignment:

208Pb(58Fe,n) excit. Parent of 261Sg, grandparent of 257Rf; correlated α chains were measured (1995Ho03,1984Mu17,1987Mu15). 208Pb(58Fe,n) 5.5 MeV/nucleon. Decay product 253Es was detected by radiochemical methods (1984DeZO,1984Og03).

Q-value: Note: Current evaluation has used the following Q record

Q-value: Estimated ΔQ(β-)=600, ΔS(n)=300, ΔS(p)=400 (1995Au04)





E(level)
(keV)
XREF T1/2(level)
     0.0  2.0 ms +3-2 
% α ≈ 100
% SF ≤ 1
  ≥300  0.75 ms +17-12 
% α ≈ 100
% SF ≤ 1
     0.0+XA  

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.0 2.0 ms +3-2 
% α ≈ 100
% SF ≤ 1
No SF observed, no evidence for β decay found (1987Mu15). No SF observed (1984Og03,1984Og02).
E(level): No SF observed, no evidence for β decay found (1987Mu15). No SF observed (1984Og03,1984Og02).
   300 0.75 ms +17-12 
% α ≈ 100
% SF ≤ 1
E(level)=303 22 (from Eα of 1999He11) if the highest energy α groups of both 265Hs isomers feed the g.s. of 261Sg.
E(level): E(level)=303 22 (from Eα of 1999He11) if the highest energy α groups of both 265Hs isomers feed the g.s. of 261Sg.

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