ADOPTED LEVELS for 258Rf

Author: Balraj Singh |  Citation: Nucl. Data Sheets 144, 297 (2017) |  Cutoff date: 25-Aug-2017 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-5460 keV SYS(n)= 7600 keV 30S(p)= 3610 keV SYQ(α)= 9190 keV 30
Reference: 2017WA10

References:
  A  258Db ε decay (4.3 S)  B  258Db ε decay (1.9 S)

General Comments:

1969Gh01: 258Rf produced and identified in 249Cf(12C,3n) and 249Cf(13C,4n) reactions through measurement of excitation functions and half-life for fission and α decays

1984Og03: 258Rf produced in 208Pb(50Ti,γ) and identified as parent of 246Cf in the α-decay chain

1985So03: 258Rf produced in 246Cm(16O,4n),E=95 MeV and measured production cross section

2008Ga08: 258Rf produced in 238U(26Mg6+,6n) reaction at E=4.9-6.0 MeV/nucleon; 238UF4 rotating target at 88-Inch cyclotron facility at LBNL and with Berkeley gas-filled recoil separator (BGS) of the LBNL. Evaporation residues recoiling from the target were separated by the BGS from the beam and other reaction products on the basis of magnetic rigidities in He gas. Measured (evaporation residues)α and (evaporation residues)αα correlations, α decay, SF decay, half-life, excitation functions.

2016He15: 258Rf obtained as daughter of 258Db, which was produced in 209Bi(50Ti,n),E=236 MeV, with 50Ti beam from the ECR source of the UNILAC at GSI. The Evaporation residues (ERs) were separated by the velocity filter SHIP and implanted into a position-sensitive 16-strip Si PIPS detector for detecting ERs, conversion electrons, and subsequent α-decays or spontaneous fission (SF) events. Escaped products into the backward hemisphere were detected by a box of six Si wafers. Measured correlations between ERs, x rays, ce, α-decay and SF events, half-life of 258Rf decay from various correlations, and %α decay mode of 258Rf.

Theoretical studies: consult the NSR database at www.nndc.bnl.gov for about 105 references dealing with theoretical calculations of half-lives for different decay modes, binding energies, fission characteristics, and other nuclear structure aspects.

The decay schemes of 258Db activities are tentative according to 2016He15

Q-value: Estimated uncertainties (2017Wa10): 310 for Q(β-), 60 for S(p)

Q-value: S(2n)=14020 40, S(2p)=6060 30 (2017Wa10)






E(level)
(keV)
XREFJπ(level) T1/2(level)
    0AB 0+ 12.0 ms 12 
% α = 4.9 16
% SF = 95.1 16
  0+X? B (2+)  
  0+YA  2.4 ms +24-8 
% IT = ?
% α = ?
% SF = ?
  0+ZA  15 µs 10 
% IT = ?
% α = ?
% SF = ?

Back to top

Back to top

Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
    00+ 12.0 ms 12 
% α = 4.9 16
% SF = 95.1 16
%α from the number of SF and α decays correlated to ce events (2016He15). Others: 31% 11 (2008Ga08, from four α-decay events, and 54 SF events, EVR-αα and EVR-SF correlation); indirect value of %α=13 determined by 1984Og03 from ratio of fission events to 246Cf α counts (α-daughter of 258Rf).
E(level): %α from the number of SF and α decays correlated to ce events (2016He15). Others: 31% 11 (2008Ga08, from four α-decay events, and 54 SF events, EVR-αα and EVR-SF correlation); indirect value of %α=13 determined by 1984Og03 from ratio of fission events to 246Cf α counts (α-daughter of 258Rf).

Back to top