ADOPTED LEVELS, GAMMAS for 71Ni

Authors: Balraj Singh and Jun Chen |  Citation: Nucl. Data Sheets 188, 1 (2023) |  Cutoff date: 17-Jan-2023 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=7304.9 keV 27S(n)= 4264 keV 3S(p)= 16170 keV 11Q(α)= -12123 keV 4
Reference: 2021WA16

References:
  A  71Co β- decay (80 MS)  B  72Co β-n decay:MIXED

General Comments:

1990Be13, 1987Ar21: 71Ni produced in 235U(n,f) and 239Pu(n,f) E=thermal followed by mass separation at GSI facility. Measured cross section for production of 71Ni.

1997Wo06: 238U(p,f) E=65 MeV/nucleon. Laser-ion guided facility, Leuven facility. Production of 71Ni isotope.

1997Hu09: 238U(p,f) E=25 MeV. Measured yield, fission distribution

2002Kr13, 2001Fr21, 2000Mu10, 1998Fr15: 238U(p,f) E=30 MeV, Leuven facility. Measured yield, γ, β, βγ coin, isotopic half-life

2004Sa13: 71Ni produced in the fragmentation of 86Kr beam at 58 MeV/nucleon with 181Ta target at GANIL facility.

2021Pe08: 71Ni produced in 9Be(86Kr,X),E=140 MeV/nucleon fragmentation reaction, followed by separation of 71Ni ions using A1900 fragment separator, with specific mass and charge of implanted nuclei determined from the time-of-flight and energy deposit analysis at NSCL-MSU facility. Measured Eβ, Iβ, Eγ, Iγ, (implants)β-correlations, half-life of the decay of 71Ni g.s., and total absorption γ spectrum (TAGS) using SuN detector (a Summing NaI(Tl) detector). Deduced B(>) distribution. Comparison with shell-model and quasi-particle random-phase approximation (QRPA) calculations.

Mass measurements: 2007Ra27 (JYFLTRAP, Penning-trap method), 2005Gu36, 1994Se12

Level systematics: 2005Gr29, 2002Gr16

Theoretical calculations:

2022Si19: calculated levels, Jπ, pairing correlations using seniority model.

2022Si22: calculated levels, Jπ, dependence of the order of the ground state multiplet (GSM) levels and the splitting of seniority multiplet.

Q-value: S(2n)=11570 4, S(2p)=30790 200 (syst) (2021Wa16)









E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)Final Levels
     0.0AB (9/2+) 2.56 s 3 
% β- = 100
    
   280.8 2 AB (7/2+)     280.8 2 
  100
     0.0
(9/2+)
   498.5 6 AB (1/2-) 2.3 s 3 
% β- = 100
    
   812.8 5 ?AB (5/2+)     812.8 5 
  100
     0.0
(9/2+)
  1065.4 6 AB (5/2-)     252.6 4 
  566.9 2 
    9 2 
  100
   812.8
   498.5
(5/2+)
(1/2-)
  1272.9 7 AB (5/2-)     774.4 3 
  100
   498.5
(1/2-)

E(level): From 71Co β- decay

Jπ(level): Assignments are from 2010RaZY, 2009St07 and 2004Sa59 based on shell-model predictions

Back to top

Back to top

Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.0(9/2+) 2.56 s 3 
% β- = 100
Configuration=νg9/2~#(70Ni g.s.).

Back to top

Additional Gamma Comments:

E(level)E(gamma)Comments
   280.8   280.8E(γ): other: 280.3 5 in 72Co β-n decay (2014Ra20)
   812.8   812.8E(γ): Ordering of the 252-813 γ cascade is interchangeable
  1065.4   252.6E(γ): Ordering of the 252-813 γ cascade is interchangeable

Back to top