ADOPTED LEVELS, GAMMAS for 65Co

Author: Jun Chen |  Citation: Nucl. Data Sheets 202, 59 (2025) |  Cutoff date: 25-Feb-2025 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=5940.6 keV 21S(n)= 7464 keV 20S(p)= 11505 keV 5Q(α)= -9868 keV 3
Reference: 2021WA16

References:
  A  65Fe β- decay (0.805 S)  B  65Fe β- decay (1.12 S)
  C  64Ni(238U,xγ)  D  238U(64Ni,xγ)
  E  238U(70Zn,xγ) 

General Comments:

Mass measurements: 2010Fe01 (mass excess=-59185.1 21), 1978Ko24 (M.E.=-59168 20)

2010Fe01 (also 2008Bl05): E=130 MeV/nucleon 76Ge beam was produced from the cyclotron at NSCL. Fragments were separated by the A1900 fragment separator and transported to the Low Energy Beam and Ion Trap (LEBIT) facility. Measured masses using the tof ion cyclotron resonance (tof-ICR) technique.

1994Cz02: 65Fe produced from fragmentation of 500-MeV/u 86Kr beam at GSI. Measured ion-β- time correlation. Deduced half-life.

1988Bo06,1985Ru05: 65Co produced by the irradiation of a natural W target with 11.5-MeV/u 76Ge beam and on-line mass separation at GSI. Measured 65Co T1/2

1978Ko24: 65Co activity from 70Zn(3He,8B) at E(3He)=80.13 MeV 5; Q3D magnetic spectrometer, proportional counters, plastic scintillator. Measured mass

Other measurements:

2015Ro11: 1H(208Pb,F) E=500 MeV/nucleon at GSI. Measured fission fragments.

2015Al19: 2H(136Xe,X) E=500 MeV/nucleon at GSI. Measured yield and σ

2007Na31: 136Xe(p,X) E=1 GeV at GSI. Measured isotopic cross sections and kinetic energies

2002Kr13: 238U(p,F) E=30 MeV at CERN. Measured fission yields

Theoretical calculations:

2019Ol02,2012Re11,2011Sr04: calculated levels, J, π.

2015Gu18: calculated negative-parity yrast band, high-spin states, B(E2), B(M1)

Q-value: S(2n)=13476 19, S(2p)=26876 4 (2021Wa16)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0.0ABCDE (7/2)- 1.16 s 3 
% β- = 100
     
   882.69 7 A CDE (3/2-) 4 ps 4     882.65 15 
  100
[E2]
     0.0
(7/2)-
  1095.34 8 A  D  (1/2-) 1.250 ns 20     212.7 1 
  100
[M1,E2]
   882.69
(3/2-)
  1222.76 7 A  DE (3/2-) 55 ps 6     127.3 1 
   340.10 6 
  1222.8 1 
    4.6 4 
  100 4 
   46 4 
[M1]
[M1,E2]
[E2]
  1095.34
   882.69
     0.0
(1/2-)
(3/2-)
(7/2)-
  1441.1 4  B    (5/2-,7/2-)     1441.1 4 
  100

     0.0
(7/2)-
  1479.4 2  BCDE (11/2)- 0.9 ps 4    1479.4 2 
  100
E2
     0.0
(7/2)-
  1557.47 7 A     (3/2-,5/2,7/2-)      674.9 1 
  1557.4 1 
   57 5 
  100 9 


   882.69
     0.0
(3/2-)
(7/2)-
  1625.5 4  B    (5/2-,7/2-)     1625.5 4 
  100

     0.0
(7/2)-
  1642.1 2  B DE (9/2-)     1642.0 2 
  100

     0.0
(7/2)-
  1948.20 12 A         1065.5 1 
  100

   882.69
(3/2-)
  1959.13 8 A  D  (3/2-) < 90 ps    736.4 1 
   863.9 1 
  1076.3 1 
  1958.8 5 
  100 8 
    5.8 4 
   44 5 
    1.7 4 
[M1,E2]
[M1,E2]
[M1,E2]
[E2]
  1222.76
  1095.34
   882.69
     0.0
(3/2-)
(1/2-)
(3/2-)
(7/2)-
  1996.52 6 A  D  (3/2-) < 90 ps    439.1 1 
   773.8 1 
   901.2 1 
  1113.7 1 
  1996.5 1 
    4.47 26 
   12.1 8 
    2.37 26 
   36.8 26 
  100 11 

[M1,E2]
[M1,E2]
[M1,E2]
[E2]
  1557.47
  1222.76
  1095.34
   882.69
     0.0
(3/2-,5/2,7/2-)
(3/2-)
(1/2-)
(3/2-)
(7/2)-
  2183.83 11 A  D  (1/2-,3/2-) < 160 ps    626.4 2 
   960.8 3 
  1088.5 1 
    2.9 7 
  100 14 
   26.4 22 

[M1,E2]
[M1,E2]
  1557.47
  1222.76
  1095.34
(3/2-,5/2,7/2-)
(3/2-)
(1/2-)
  2276.07 12 A         1053.3 1 
  100

  1222.76
(3/2-)
  2443.4 4  B        2443.3 4 
  100

     0.0
(7/2)-
  2470.12 12 A     (3/2-,5/2,7/2-)     1587.4 1 
  2470.4 5 
  100 6 
   31 6 


   882.69
     0.0
(3/2-)
(7/2)-
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  2479.2 2  BCDE (11/2-)      836.9 3 
   999.9 2 
   57 14 
  100 8 


  1642.1
  1479.4
(9/2-)
(11/2)-
  2557.6 3  B    (7/2+,9/2+)     2557.5 3 
  100

     0.0
(7/2)-
  2669.4 2    DE (13/2-) 0.6 ps 4     190.2 2 
  1190.0 2 
   41 5 
  100 8 
(M1)
[M1,E2]
  2479.2
  1479.4
(11/2-)
(11/2)-
  2891.9 3  B D  (9/2+,11/2+)      412.9 5 
  1412.5 2 
   12 6 
  100 14 


  2479.2
  1479.4
(11/2-)
(11/2)-
  2896.1 4  B    (7/2,9/2,11/2-)     2896.0 4 
  100

     0.0
(7/2)-
  2926.3 3    D       447.1 2 
  100

  2479.2
(11/2-)
  3028.7 3    DE (15/2-)      359.3 2 
  100

  2669.4
(13/2-)
  3271.5 4    DE (15/2-,17/2+)      242.8 2 
  100

  3028.7
(15/2-)

E(level): From a least-squares fit to γ-ray energies

T1/2(level): From βγ(t) or βγγ(t) in 65Fe β- decay (0.805 s) (2019Ol02) for excited levels, unless otherwise noted

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Band Transitions:

E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - Sequence based on g.s.
     0.0 (7/2)- 1.16 s 3 
% β- = 100
     
  1479.4 2  (11/2)- 0.9 ps 4    1479.4 2 
  100
E2
     0.0
(7/2)-
  2479.2 2  (11/2-)      836.9 3 
   999.9 2 
   57 14 
  100 8 


  1642.1
  1479.4
(9/2-)
(11/2)-
  2669.4 2  (13/2-) 0.6 ps 4     190.2 2 
  1190.0 2 
   41 5 
  100 8 
(M1)
[M1,E2]
  2479.2
  1479.4
(11/2-)
(11/2)-
  3028.7 3  (15/2-)      359.3 2 
  100

  2669.4
(13/2-)
  3271.5 4  (15/2-,17/2+)      242.8 2 
  100

  3028.7
(15/2-)

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
   882.69 (3/2-) 4 ps 4     882.65 15 [E2]0.000296B(E2)(W.u.)>8.5, α=0.000296 4, α(K)=0.000267 4, α(L)=2.59E-5 4, α(M)=3.60E-6 5, α(N)=1.599E-7 22
  1095.34 (1/2-) 1.250 ns 20     212.7 1 [M1,E2]0.018α=0.018 12, α(K)=0.016 11, α(L)=0.0016 11, α(M)=2.3×10-4 15, α(N)=9.E-6 6
  1222.76 (3/2-) 55 ps 6     127.3 1 [M1]0.02147B(M1)(W.u.)=0.00591 +90-77, α=0.02147 30, α(K)=0.01926 27, α(L)=0.001924 27, α(M)=0.000268 4, α(N)=1.171×10-5 17
(3/2-) 55 ps 6     340.10 6 [M1,E2]0.0037α=0.0037 18, α(K)=0.0033 16, α(L)=3.2×10-4 16, α(M)=4.5E-5 22, α(N)=1.9E-6 9
(3/2-) 55 ps 6    1222.8 1 [E2]0.0001496B(E2)(W.u.)=0.074 +10-9, α=0.0001496 21, α(K)=0.0001234 17, α(L)=1.189E-5 17, α(M)=1.658E-6 23, α(N)=7.40E-8 10
  1479.4 (11/2)- 0.9 ps 4    1479.4 2 E20.0001710B(E2)(W.u.)=5.7 +43-18, α=0.0001710 24, α(K)=8.24E-5 12, α(L)=7.92E-6 11, α(M)=1.104E-6 15, α(N)=4.94E-8 7
  1959.13 (3/2-) < 90 ps    736.4 1 [M1,E2]0.00040α=0.00040 7, α(K)=0.00036 7, α(L)=3.5×10-5 7, α(M)=4.9E-6 9, α(N)=2.2E-7 4
(3/2-) < 90 ps    863.9 1 [M1,E2]0.00028α=0.00028 4, α(K)=0.000248 34, α(L)=2.40×10-5 34, α(M)=3.3E-6 5, α(N)=1.49E-7 20
(3/2-) < 90 ps   1076.3 1 [M1,E2]0.000168α=0.000168 15, α(K)=0.000151 14, α(L)=1.46×10-5 13, α(M)=2.03E-6 19, α(N)=9.1E-8 8
(3/2-) < 90 ps   1958.8 5 [E2]0.000345B(E2)(W.u.)>1.1E-4, α=0.000345 5, α(K)=4.78E-5 7, α(L)=4.58E-6 6, α(M)=6.39E-7 9, α(N)=2.87E-8 4
  1996.52 (3/2-) < 90 ps    773.8 1 [M1,E2]0.00036α=0.00036 6, α(K)=0.00032 5, α(L)=3.1×10-5 5, α(M)=4.4E-6 7, α(N)=1.94E-7 32
(3/2-) < 90 ps    901.2 1 [M1,E2]0.000250α=0.000250 32, α(K)=0.000225 28, α(L)=2.17×10-5 28, α(M)=3.0E-6 4, α(N)=1.35E-7 17
(3/2-) < 90 ps   1113.7 1 [M1,E2]0.000157α=0.000157 13, α(K)=0.000141 12, α(L)=1.35×10-5 12, α(M)=1.89E-6 16, α(N)=8.4E-8 7
(3/2-) < 90 ps   1996.5 1 [E2]0.000362B(E2)(W.u.)>0.0076, α=0.000362 5, α(K)=4.62E-5 6, α(L)=4.42E-6 6, α(M)=6.17E-7 9, α(N)=2.77E-8 4
  2183.83 (1/2-,3/2-) < 160 ps    960.8 3 [M1,E2]0.000216α=0.000216 24, α(K)=0.000194 22, α(L)=1.88×10-5 22, α(M)=2.62E-6 30, α(N)=1.17E-7 13
(1/2-,3/2-) < 160 ps   1088.5 1 [M1,E2]0.000164α=0.000164 15, α(K)=0.000148 13, α(L)=1.42×10-5 13, α(M)=1.98E-6 18, α(N)=8.9E-8 8
  2669.4 (13/2-) 0.6 ps 4     190.2 2 (M1)0.00766B(M1)(W.u.)=1.6 +17-7, α=0.00766 11, α(K)=0.00688 10, α(L)=0.000681 10, α(M)=9.50×10-5 14, α(N)=4.18E-6 6
(13/2-) 0.6 ps 4    1190.0 2 [M1,E2]0.000142α=0.000142 11, α(K)=0.000122 9, α(L)=1.18×10-5 9, α(M)=1.64E-6 12, α(N)=7.3E-8 5

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
   882.69(3/2-) 4 ps 4  XREF: C(883?).
  1441.1(5/2-,7/2-)   Jπ(level): From shell-model predictions, 2009Pa16 assign 1441 and 1626 levels as the candidates for the 5/2- and 7/2- members of the πf7/2-1~#2+ multiplet, while 1479 and 1642 levels have been assigned as the (9/2-) and (11/2-) member, respectively, from systematics of 59Co, 61Co and 64Co. The assignments of 1479 and 1642 levels are inverse based on a later study by 2012Re11. See more comments at those levels.
  1479.4(11/2)- 0.9 ps 4  XREF: C(1479?).
Jπ(level): Proposed by 2012Re11 in (70Zn,Xγ) for 1479 and 1642 levels, based on their measured γ(θ) and shell-model predictions. Note that the assignments are inverse in 2009Pa16 in their decay scheme of 65Fe β- decay (1.12 s), mainly based on systematics of neighboring odd-A Co isotopes. 2012Re11 claim that from their data, the intensity ratio of the 1480γ and 1643γ is completely different from those for corresponding transitions in 61Co and 63Co, which, together with measured Rasym of 1480γ suggesting ΔJ=2, indicates a spin-parity inversion for the two levels as members of the πf7/2-1|~#2+(66Ni) multiplet, compared to spin-parities of correspdoning levels in 61Co and 63Co.
  1625.5(5/2-,7/2-)   Jπ(level): From shell-model predictions, 2009Pa16 assign 1441 and 1626 levels as the candidates for the 5/2- and 7/2- members of the πf7/2-1~#2+ multiplet, while 1479 and 1642 levels have been assigned as the (9/2-) and (11/2-) member, respectively, from systematics of 59Co, 61Co and 64Co. The assignments of 1479 and 1642 levels are inverse based on a later study by 2012Re11. See more comments at those levels.
  1642.1(9/2-)   Jπ(level): Proposed by 2012Re11 in (70Zn,Xγ) for 1479 and 1642 levels, based on their measured γ(θ) and shell-model predictions. Note that the assignments are inverse in 2009Pa16 in their decay scheme of 65Fe β- decay (1.12 s), mainly based on systematics of neighboring odd-A Co isotopes. 2012Re11 claim that from their data, the intensity ratio of the 1480γ and 1643γ is completely different from those for corresponding transitions in 61Co and 63Co, which, together with measured Rasym of 1480γ suggesting ΔJ=2, indicates a spin-parity inversion for the two levels as members of the πf7/2-1|~#2+(66Ni) multiplet, compared to spin-parities of correspdoning levels in 61Co and 63Co.
  2479.2(11/2-)   XREF: C(2479?).
  3028.7(15/2-)   Jπ(level): Proposed by 2009Pa16 based on systematics of 61Co and 63Co, and shell-model predictions (2009Pa16).
  3271.5(15/2-,17/2+)   Jπ(level): Proposed by 2009Pa16 based on systematics of 61Co and 63Co, and shell-model predictions (2009Pa16).

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Additional Gamma Comments:

E(level)E(gamma)Comments
   882.69   882.65E(γ): other: 882.3 7 from (70Zn,xγ)
  1222.76   340.10E(γ): other: 340.7 7 from (70Zn,xγ)
  1479.4  1479.4E(γ): weighted average of 1479.5 2 from 65Fe β- decay (1.12 s), 1479.2 2 from (64Ni,Xγ), and 1479.5 3 from (70Zn,xγ)
M(γ): Q, ΔJ=2 from γ(θ) in (70Zn,xγ); M2 ruled out by RUL
  1642.1  1642.0E(γ): from (64Ni,Xγ). Others: 1641.9 3 from 65Fe β- decay (1.12 s) and 1642.8 7 from (70Zn,xγ)
  2479.2   836.9E(γ): weighted average of 836.6 2 from 65Fe β- decay (1.12 s) and 837.1 2 from (64Ni,Xγ)
I(γ): weighted average of 78 17 from 65Fe β- decay (1.12 s) and 48 11 from (64Ni,Xγ)
   999.9E(γ): others: 999.7 3 from 65Fe β- decay (1.12 s) and 1000.4 6 from (70Zn,xγ). From 238U(64Ni,Xγ).
I(γ): other: 100 11 from 65Fe β- decay (1.12 s). From 238U(64Ni,Xγ).
  2669.4   190.2E(γ): weighted average of 190.1 2 from (64Ni,Xγ) and 190.5 3 from (70Zn,xγ)
I(γ): weighted average of 38 7 from (64Ni,Xγ) and 43 5 from (70Zn,xγ)
M(γ): d, ΔJ=1 from γ(θ) in (70Zn,xγ); Δπ=(no) from level scheme
  1190.0E(γ): From 238U(64Ni,Xγ).
I(γ): From 238U(64Ni,Xγ).
  2891.9   412.9E(γ): other: 413.0 10 from 65Fe β- decay (1.12 s). From 238U(64Ni,Xγ).
  1412.5E(γ): not seen in (64Ni,Xγ)
  2926.3   447.1E(γ): From 238U(64Ni,Xγ).
  3028.7   359.3E(γ): weighted average of 359.2 2 from (64Ni,Xγ) and 359.3 2 from (70Zn,xγ)
  3271.5   242.8E(γ): other: 242.7 2 from (70Zn,xγ). From 238U(64Ni,Xγ).

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