ADOPTED LEVELS, GAMMAS for 81Zr

Author: M. Shamsuzzoha Basunia |  Citation: Nucl. Data Sheets 199, 271 (2025) |  Cutoff date: 1-Sep-2024 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-11160 keV SYS(n)= 10840 keV SYS(p)= 3670 keV 90Q(α)= -2150 keV 90
Reference: 2021WA16

References:
  A  58Ni(28Si,αnγ) 

General Comments:

Production:

52Cr(32S,3n), E=110 MeV; surface barrier p detector, x-ray detector, NaI and Ge(Li) (1977FaZW, 1980HaZG).

54Fe(32S,αn), E=123 MeV; β recoil time-of-flight mass spectrometer, plastic scin (1982De36).

Ni+106Cd, E(106Cd)=60 MeV/α (1994He28).

58Ni+32S, E(32S)=150 MeV; HPGe and Si(Au) (FWHM=60 keV) detectors (1997Hu15, 1999Hu05).

Other: 1965Za02.

From shape of ε-delayed p spectrum, 1999Hu05 deduce Q(ε)-S(p)(81Y)=4.7 MeV 2 (cf. 4.52 MeV 13 (2021Wa16)). See 1984Ha58 and 1997Hu15 for proton spectrum from 81Zr εp decay. The measured β+ endpoint energy is 6.14 MeV 25 (1982De36); the 81Y level population has not been established.

Levels: band(a) ν 3/2[301], α=-1/2 band (2000Ma04). See comment on signature partner band.

Levels: band(b) ν 5/2[422], α=-1/2 band (2000Ma04). See comment on signature partner band.

Levels: band(c) ν 1/2[431], α=-1/2 band. See comment on signature partner band.

Q-value: ΔQ(β-)=410, ΔS(n)=310 (syst,2021Wa16)

Q-value: S(2n)=26900 310 (syst), S(2p)=6620 90, Q(εp)=5500 90 (2021Wa16)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0.0A (3/2-) 5.3 s 3 
% ε = 100
% εp = 0.12 2
     
     0.0+XA (5/2+)        
   133.2 3 A (1/2+) < 28 ns    133.4 4 
  100

     0.0
(3/2-)
   142.978+X 16 A (7/2+)      143.0 2 
  100
(M1)
     0.0+X
(5/2+)
   167.21 17 A (5/2-)      167.2 2 
  100

     0.0
(3/2-)
   191.85 19 A (3/2+) < 28 ns     58.7?
   191.8 2 
 
  100


   133.2
     0.0
(1/2+)
(3/2-)
   303.0+X 16 A (9/2+)      160.1 2 
   303.0 2 
  100 6 
   33.0 21 
(M1)

   142.978+X
     0.0+X
(7/2+)
(5/2+)
   369.94 23 A (5/2+)      178.0 2 
   236.8 2 
   89 22 
  100 22 


   191.85
   133.2
(3/2+)
(1/2+)
   405.39 17 A (7/2-)      238.2 3 
   405.4 2 
  100 4 
   36 4 
(M1)

   167.21
     0.0
(5/2-)
(3/2-)
   501.22 25 A (7/2+)      309.4 2 
  100

   191.85
(3/2+)
   697.62 19 A (9/2-)      292.3 2 
   530.4 2 
   83 4 
  100 4 
(M1)
(E2)
   405.39
   167.21
(7/2-)
(5/2-)
   737.08+X 19 A (11/2+)      434.1 2 
   594.1 2 
  100 8 
   27.9 21 
D+Q

   303.0+X
   142.978+X
(9/2+)
(7/2+)
   832.2 3 A (9/2+)      331.0 2 
   462.2 2 
   23 4 
  100 15 


   501.22
   369.94
(7/2+)
(5/2+)
   979.48+X 21 A (13/2+)      242.4 2 
   676.4 2 
   11.4 8 
  100.0 20 

(E2)
   737.08+X
   303.0+X
(11/2+)
(9/2+)
  1026.9 4 A (11/2+)      525.7 2 
  100

   501.22
(7/2+)
  1065.06 21 A (11/2-)      367.5 2 
   659.6 2 
   66 3 
  100 6 
(M1)
(E2)
   697.62
   405.39
(9/2-)
(7/2-)
  1466.63 23 A (13/2-)      401.6 2 
   769.0 2 
   22.9 13 
  100 8 
D+Q

  1065.06
   697.62
(11/2-)
(9/2-)
  1528.2 4 A (13/2+)      696.0 2 
  100

   832.2
(9/2+)
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  1576.24+X 23 A (15/2+)      596.8 2 
   839.2 2 
   46 4 
  100 10 


   979.48+X
   737.08+X
(13/2+)
(11/2+)
  1769.4 4 A (15/2+)      742.5 2 
  100

  1026.9
(11/2+)
  1865.58+X 25 A (17/2+)      289.4 2 
   886.0 2 
   18.7 13 
  100.0 26 

(E2)
  1576.24+X
   979.48+X
(15/2+)
(13/2+)
  1960.2 3 A (15/2-)      493.6 2 
   895.1 2 
   33 4 
  100 13 


  1466.63
  1065.06
(13/2-)
(11/2-)
  2438.2 4 A (17/2+)      910.0 2 
  100

  1528.2
(13/2+)
  2454.3 3 A (17/2-)      987.8 2 
  100

  1466.63
(13/2-)
  2615.2+X 3 A (19/2+)      749.6 2 
  1039.0 2 
   60 16 
  100 9 


  1865.58+X
  1576.24+X
(17/2+)
(15/2+)
  2728.2 5 A (19/2+)      958.8 2 
  100

  1769.4
(15/2+)
  2930.4+X 4 A (21/2+)     1064.8 2 
  100

  1865.58+X
(17/2+)
  3069.4 4 A (19/2-)     1109.2 2 
  100

  1960.2
(15/2-)
  3553.2 11 A (21/2+)     1115 1 
  100

  2438.2
(17/2+)
  3635.4 4 A (21/2-)     1181.0 2 
  100

  2454.3
(17/2-)
  3797.2+X 11 A (23/2+)     1182
  100

  2615.2+X
(19/2+)
  3899.9 6 A (23/2+)     1171.7 4 
  100

  2728.2
(19/2+)
  4055.1+X 4 A (25/2+)     1124.7 2 
  100

  2930.4+X
(21/2+)
  4334.2 5 A (23/2-)     1264.8 3 
  100

  3069.4
(19/2-)
  4889.3 6 A (25/2-)     1253.8 4 
  100

  3635.4
(21/2-)
  5128.6+X 5 A (29/2+)     1073.5 2 
  100

  4055.1+X
(25/2+)
  5271.9 12 A (27/2+)     1372
  100

  3899.9
(23/2+)
  5672.2 11 A (27/2-)     1338
  100

  4334.2
(23/2-)
  6244.3 12 A (29/2-)     1355
  100

  4889.3
(25/2-)
  6317.6+X 11 A (33/2+)     1189
  100

  5128.6+X
(29/2+)
  6835.9 16 ?A (31/2+)     1564?
  100

  5271.9
(27/2+)
  7708.6+X 15 A (37/2+)     1391
  100

  6317.6+X
(33/2+)

E(level): From-least squares fit to Eγ.

Jπ(level): Based on energy systematics in neighboring n=41 isotones or Tz=1/2 nuclides, and supported by measured ADO and DCO ratios and γ(θ) in 58Ni(28Si,αnγ), except as noted.

M(γ): From γ(θ) in 58Ni(28Si,αnγ), assigning Δπ=(no) to intraband transitions, except as 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 - ν 3/2[301], α=+1/2 band (2000Ma04).
   167.21 17  (5/2-)        
   697.62 19  (9/2-)        
  1466.63 23  (13/2-)      401.6 2 
   769.0 2 
   22.9 13 
  100 8 
D+Q

  1065.06
   697.62
(11/2-)
(9/2-)
  2454.3 3  (17/2-)      987.8 2 
  100

  1466.63
(13/2-)
  3635.4 4  (21/2-)     1181.0 2 
  100

  2454.3
(17/2-)
  4889.3 6  (25/2-)     1253.8 4 
  100

  3635.4
(21/2-)
  6244.3 12  (29/2-)     1355
  100

  4889.3
(25/2-)
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 2 - ν 5/2[422], α=+1/2 band (2000Ma04).
     0.0+X (5/2+)        
   303.0+X 16  (9/2+)        
   979.48+X 21  (13/2+)      242.4 2 
   676.4 2 
   11.4 8 
  100.0 20 

(E2)
   737.08+X
   303.0+X
(11/2+)
(9/2+)
  1865.58+X 25  (17/2+)      289.4 2 
   886.0 2 
   18.7 13 
  100.0 26 

(E2)
  1576.24+X
   979.48+X
(15/2+)
(13/2+)
  2930.4+X 4  (21/2+)     1064.8 2 
  100

  1865.58+X
(17/2+)
  4055.1+X 4  (25/2+)     1124.7 2 
  100

  2930.4+X
(21/2+)
  5128.6+X 5  (29/2+)     1073.5 2 
  100

  4055.1+X
(25/2+)
  6317.6+X 11  (33/2+)     1189
  100

  5128.6+X
(29/2+)
  7708.6+X 15  (37/2+)     1391
  100

  6317.6+X
(33/2+)
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 3 - ν 1/2[431], α=+1/2 band.
   133.2 3  (1/2+) < 28 ns      
   369.94 23  (5/2+)        
   832.2 3  (9/2+)      331.0 2 
   462.2 2 
   23 4 
  100 15 


   501.22
   369.94
(7/2+)
(5/2+)
  1528.2 4  (13/2+)      696.0 2 
  100

   832.2
(9/2+)
  2438.2 4  (17/2+)      910.0 2 
  100

  1528.2
(13/2+)
  3553.2 11  (21/2+)     1115 1 
  100

  2438.2
(17/2+)

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
   133.2 (1/2+) < 28 ns    133.4 4  α(K)=0.0431 7, α(L)=0.00483 8, α(M)=0.000834 14, α(N)=0.0001166 19, α(O)=7.59×10-6 12
   142.978+X (7/2+)      143.0 2 (M1)0.0761α=0.0761 11, α(K)=0.0668 10, α(L)=0.00771 11, α(M)=0.001342 19, α(N)=0.0001899 28, α(O)=1.315×10-5 19
   303.0+X (9/2+)      160.1 2 (M1)0.0562α=0.0562 8, α(K)=0.0494 7, α(L)=0.00568 8, α(M)=0.000988 14, α(N)=0.0001399 20, α(O)=9.71×10-6 14
   405.39 (7/2-)      238.2 3 (M1)0.01983α=0.01983 29, α(K)=0.01745 25, α(L)=0.001984 29, α(M)=0.000345 5, α(N)=4.89×10-5 7, α(O)=3.42E-6 5
   697.62 (9/2-)      292.3 2 (M1)0.01179α=0.01179 17, α(K)=0.01039 15, α(L)=0.001174 17, α(M)=0.0002039 29, α(N)=2.89×10-5 4, α(O)=2.031E-6 29
(9/2-)      530.4 2 (E2)0.00352α=0.00352 5, α(K)=0.00309 4, α(L)=0.000358 5, α(M)=6.22×10-5 9, α(N)=8.73E-6 12, α(O)=5.79E-7 8
   979.48+X (13/2+)      676.4 2 (E2)1.78×10-3α=1.78×10-3 3, α(K)=0.001563 22, α(L)=0.0001778 25, α(M)=3.09E-5 4, α(N)=4.35E-6 6, α(O)=2.96E-7 4
  1065.06 (11/2-)      367.5 2 (M1)0.00669α=0.00669 9, α(K)=0.00589 8, α(L)=0.000661 9, α(M)=0.0001149 16, α(N)=1.631×10-5 23, α(O)=1.150E-6 16
(11/2-)      659.6 2 (E2)1.90×10-3α=1.90×10-3 3, α(K)=0.001672 23, α(L)=0.0001906 27, α(M)=3.31E-5 5, α(N)=4.66E-6 7, α(O)=3.16E-7 4
  1865.58+X (17/2+)      886.0 2 (E2)8.93×10-4α=8.93×10-4 13, α(K)=0.000787 11, α(L)=8.81E-5 12, α(M)=1.527E-5 21, α(N)=2.161E-6 30, α(O)=1.497E-7 21

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.0(3/2-) 5.3 s 3 
% ε = 100
% εp = 0.12 2
Jπ(level): From 1999Hu05 and 2005Xu04; leads to consistency between measured p spectrum and statistical model calculations using level densities from backshifted Fermi gas model (1999Hu05), but statistics are too poor to differentiate between several alternative Jπ possibilities. See also 2005Xu04. Jπ=3/2(-) for 79Sr isotone.
T1/2(level): Weighted average of 5.3 s 5 (386γ(t)(80Sr), 1997Hu15; see also 1999Hu05), 5.9 s 6 (1977FaZW), 6.3 s 5 (1976HaWO), 5.0 s 2 and 4.8 s 5 (from the decay curves for β events correlated with 81Z implantations and γ(113,175,230)(t), respectively in 2009St04). Others: 15 s 5 from β+(t) for component of α=81 mass spectrum (1982De36); 1997Hu15 suggest that this datum may have been corrupted due to the direct production of 70 s 81Y in the reaction used by 1982De36. T1/2=7-15 min from 1965Za02 suggests an erroneous isotopic assignment.
     0.0+X(5/2+)   E(level): ν 5/2[422], α=+1/2 band (2000Ma04).
   133.2(1/2+) < 28 ns E(level): ν 1/2[431], α=+1/2 band.
   167.21(5/2-)   E(level): ν 3/2[301], α=+1/2 band (2000Ma04).
   303.0+X(9/2+)   E(level): ν 5/2[422], α=+1/2 band (2000Ma04).
   369.94(5/2+)   E(level): ν 1/2[431], α=+1/2 band.
   697.62(9/2-)   E(level): ν 3/2[301], α=+1/2 band (2000Ma04).
   832.2(9/2+)   E(level): ν 1/2[431], α=+1/2 band.
   979.48+X(13/2+)   E(level): ν 5/2[422], α=+1/2 band (2000Ma04).
  1466.63(13/2-)   E(level): ν 3/2[301], α=+1/2 band (2000Ma04).
  1528.2(13/2+)   E(level): ν 1/2[431], α=+1/2 band.
  1865.58+X(17/2+)   E(level): ν 5/2[422], α=+1/2 band (2000Ma04).
  2438.2(17/2+)   E(level): ν 1/2[431], α=+1/2 band.
  2454.3(17/2-)   E(level): ν 3/2[301], α=+1/2 band (2000Ma04).
  2930.4+X(21/2+)   E(level): ν 5/2[422], α=+1/2 band (2000Ma04).
  3553.2(21/2+)   E(level): ν 1/2[431], α=+1/2 band.
  3635.4(21/2-)   E(level): ν 3/2[301], α=+1/2 band (2000Ma04).
  4055.1+X(25/2+)   E(level): ν 5/2[422], α=+1/2 band (2000Ma04).
  4889.3(25/2-)   E(level): ν 3/2[301], α=+1/2 band (2000Ma04).
  5128.6+X(29/2+)   E(level): ν 5/2[422], α=+1/2 band (2000Ma04).
  6244.3(29/2-)   E(level): ν 3/2[301], α=+1/2 band (2000Ma04).
  6317.6+X(33/2+)   E(level): ν 5/2[422], α=+1/2 band (2000Ma04).
  7708.6+X(37/2+)   E(level): ν 5/2[422], α=+1/2 band (2000Ma04).

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Additional Gamma Comments:

E(level)E(gamma)Comments
   142.978+X   143.0M(γ): d intraband transition.
   191.85    58.7E(γ): Transition expected from coincidence data, but not observed in 58Ni(28Si,αnγ) by 2004Ma39. Eγ from level energy difference.

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