ADOPTED LEVELS for 255Rf

Authors: E. Browne, J. K. Tuli |  Citation: Nucl. Data Sheets 114, 1041 (2013) |  Cutoff date: 1-Nov-2011 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-5402 keV SYS(n)= 6939 keV SYS(p)= 2831 keV SYQ(α)= 9055 keV 4
Reference: 2012WA38

References:
  A  259Sg α decay  B  208Pb(48Ti,n)

General Comments:

1994Cw02 calculated the following single-particle level sequence: 0, 9/2[734]; 290, 7/2[624]; 400, 5/2[622]; 670, 1/2[620]; 790, 3/2[622]; 890, 11/2[725]; 920, 7/2[613]. See also 2005Pa73

Production and identification of 255Rf nuclide:

1975Og01, 1975Og04: 207Pb(50Ti,2n) excit, fission fragments detected

1985He06, 1986He28, 1989He03: 207Pb(50Ti,2n) E=192 MeV; total of 19 α particles detected by α-α correlation

1984Og02, 1984Og03: 208Pb(50Ti,2n)

1997He29: 208Pb(50Ti,3n), 206Pb(50Ti,n), E=4.9 to 5.1 MeV per α, measured excit, delayed α-α correlations.

2001He35: 207Pb(50Ti,2n). Measured α, αγ, αα. In the experiment with improved statistics, compared with their earlier experiments, the authors did not confirm any indication for existence of a low-lying isomer in 255Rf with T1/2≈0.9 s. Also 1999He07.

2006He27: 255Rf isotope produced by the 207Pb(50Ti,2n) at E=4.85 MeV/nucleon. Reaction products were separated from the primary beam by the SHIP velocity filter at GSI facility and implanted into a position-sensitive 16-strip PIPS detector.

α tentative α-decaying isomer with half-life=0.8 s +5-2 reported by 1997He29 has not been confirmed in authors’ later (higher statistics) works of 2001He25 and 2006He27

Q-value: Δ(Q(β-))=438, Δ(S(n))=306, Δ(S(p))=322 (syst,2012Wa38)

Q-value: Q(εp)=2317 115 (syst,2012Wa38)






E(level)
(keV)		XREFJπ(level) T1/2(level)
     0.0AB (9/2-) 1.68 s 9 
% α = 42 9
% SF = 58 9
% ε < 1
   ≈63A   
  ≈121A   
  ≈656A   

E(level): From 259Sg α decay.

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.0(9/2-) 1.68 s 9 
% α = 42 9
% SF = 58 9
% ε < 1
%SF from T1/2(SF)=2.9 s 4 (weighted average of 2.7 s 5 (1985He06) and 3.1 s 4 (1997He29), recommended in 2000Ho27), and T1/2=1.68 s 9 (2006He27).
E(level): %SF from T1/2(SF)=2.9 s 4 (weighted average of 2.7 s 5 (1985He06) and 3.1 s 4 (1997He29), recommended in 2000Ho27), and T1/2=1.68 s 9 (2006He27).

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