ADOPTED LEVELS, GAMMAS for 71Se

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-)=-6644 keV 6S(n)= 9288 keV 3S(p)= 6102 keV 3Q(α)= -2898 keV 5
Reference: 2021WA16

References:
  A  71Br ε decay (21.4 S)  B  54Fe(23Na,NPAG)
  C  58Ni(16O,2pnγ) 

General Comments:

1957Be43: identification and production of 71Se from Cu(14N,X) reaction, measured half-life.

1957At37: identification and production of 71Se from 70Ge(α,3n) reaction, measured half-life.

Mass measurements: 2021Ma22, 2002Li24, 2001Ha66, 1998Ch20

Theoretical calculations:

2015Ka46: calculated low- and high-spin levels, Jπ, B(E2) using shell-model with a pairing-plus-multipole Hamiltonian and monopole-based universal force interaction (PMMU model).

1989Sa34: calculated levels, B(|l) using deformed configuration mixing model

Levels: Q(transition) values are from 54Fe(23Na,pnαγ), deduced by 2012Ho16

Q-value: S(2n)=22854 3, S(2p)=10624 3, Q(εp)=126.6 29, Q(ε)=4747 5 (2021Wa16)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0.0ABC (5/2-) 4.74 m 5 
% ε = 100
     
    48.78 5 ABC (1/2-) 5.6 µs 7 
% IT = 100
    48.78 5 
  100
E2
     0.0
(5/2-)
   171.52 6 AB  (3/2-)      122.72 5 
   171.6 1 
   83 7 
  100 8 
D+Q
D+Q
    48.78
     0.0
(1/2-)
(5/2-)
   260.48 10 ABC (9/2+) 19.0 µs 5 
% IT = 100
   260.5 1 
  100
[M2]
     0.0
(5/2-)
   282.47 7 ABC (3/2-)      233.8 1 
   282.4 1 
  100 8 
   40 8 
D+Q
(D+Q)
    48.78
     0.0
(1/2-)
(5/2-)
   647.80 18 A   (5/2+,7/2,9/2-)      387.4 2 
   647.6 3 
  100 14 
   71 14 


   260.48
     0.0
(9/2+)
(5/2-)
   756.98 15 ABC (5/2-)      474.6 2 
   756.9 2 
   54 8 
  100 10 
D+Q
D+Q
   282.47
     0.0
(3/2-)
(5/2-)
   796.8 4 AB  (5/2-)      796.7 4 
  100
D+Q
     0.0
(5/2-)
  1040.67 12  BC (7/2-) 1.0 ps 7     758.2 1 
   868.9 8 
  1040.6 4 
   74 13 
   13 4 
  100 18 
E2
[E2]
(M1+E2)
   282.47
   171.52
     0.0
(3/2-)
(3/2-)
(5/2-)
  1154.6 3  BC (11/2+)      894.1 3 
  100
(D+Q)
   260.48
(9/2+)
  1233.0 3  BC (9/2-)     1233.0 4 
  100
Q
     0.0
(5/2-)
  1297.8 3  BC (13/2+) 0.90 ps 28     143.2 7 
  1037.3 3 
    0.9 5 
  100
[M1]
E2
  1154.6
   260.48
(11/2+)
(9/2+)
  1378.67 25  BC (9/2-)      581.6 5 
   621.8 5 
  1378.7 4 
   30 6 
   35 8 
  100 38 
(Q)
(Q)
(Q)
   796.8
   756.98
     0.0
(5/2-)
(5/2-)
(5/2-)
  1680.7 4  BC (11/2-) 1.7 ps 7     640.1 4 
  100
E2
  1040.67
(7/2-)
  2066.2 3  B  (13/2-)      687.5 2 
   833.2 3 
   50 7 
  100 14 
Q
Q
  1378.67
  1233.0
(9/2-)
(9/2-)
  2417.9 4  BC (15/2+) 0.27 ps +8-7    1120.1 5 
  1263.3 6 
  100 22 
   89 22 
[M1,E2]
[E2]
  1297.8
  1154.6
(13/2+)
(11/2+)
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  2448.3 3  BC (17/2+) 0.534 ps +42-35    1150.5 1 
  100
(E2)
  1297.8
(13/2+)
  2481.6 4  BC (15/2-) 0.53 ps 28     800.9 3 
  100
(E2)
  1680.7
(11/2-)
  2975.8 4  BC (17/2-) 0.82 ps 8     909.6 2 
  100
(E2)
  2066.2
(13/2-)
  3323.3 4  B  (17/2-)      841.7 5 
  100
D+Q
  2481.6
(15/2-)
  3427.1 5  BC (19/2-) 0.638 ps 21     945.5 3 
  100
(E2)
  2481.6
(15/2-)
  3451.5 4  BC (19/2+) 0.30 ps +8-6    1003.2 4 
  1033.6 4 
  100 18 
   91 36 

(E2)
  2448.3
  2417.9
(17/2+)
(15/2+)
  3521.4 4  B  (19/2-)      198.1 4 
  1073.1 4 
    8.5 23 
  100 15 

D
  3323.3
  2448.3
(17/2-)
(17/2+)
  3635.2 4  BC (21/2+) 0.284 ps 14    1186.9 3 
  100
(E2)
  2448.3
(17/2+)
  3989.1 4  B  (21/2-)      467.7 2 
   562.0 4 
   665.8 2 
  1013.3 9 
  100 25 
   50 13 
   38 13 
   38 25 

D+Q


  3521.4
  3427.1
  3323.3
  2975.8
(19/2-)
(19/2-)
(17/2-)
(17/2-)
  4039.4 4  BC (21/2-) 0.485 ps 14    1063.6 2 
  100
[E2]
  2975.8
(17/2-)
  4254.3 5  B  (23/2-)      265.2 4 
   732.9 6 
   77 37 
  100 33 
(D+Q)

  3989.1
  3521.4
(21/2-)
(19/2-)
  4497.2 7  BC (23/2+) < 0.80 ps    862.0 10 
  1045.7 7 
   42 16 
  100 16 
[M1,E2]
(E2)
  3635.2
  3451.5
(21/2+)
(19/2+)
  4504.9 7  BC (23/2-) 0.333 ps 14    1077.7 5 
  100
E2
  3427.1
(19/2-)
  4834.4 7  BC (25/2+) 0.326 ps 28     337.2 6 
  1199.2 10 
    6 4 
  100 25 
[M1]
[E2]
  4497.2
  3635.2
(23/2+)
(21/2+)
  5240.3 11  B  (25/2-) < 0.17 ps   1200.9 10 
  100
[E2]
  4039.4
(21/2-)
  5645.6 7  B  (27/2-) 0.395 ps 35    1140.7 1 
  100
[E2]
  4504.9
(23/2-)
  5686.8 8  B  (27/2+)     1189.6 8 
  100

  4497.2
(23/2+)
  6036.4 13  BC (29/2+) 0.374 ps 28    1202.0 10 
  100
[E2]
  4834.4
(25/2+)
  6340.5 8  B  (29/2+)      653.7 3 
  1506.1 3 
  100 25 
  100 50 


  5686.8
  4834.4
(27/2+)
(25/2+)
  6947.6 11  B  (31/2-) < 0.17 ps   1302.0 8 
  100
[E2]
  5645.6
(27/2-)
  7375.6 16  B  (33/2+) < 0.09 ps   1339.2 10 
  100
[E2]
  6036.4
(29/2+)

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

Jπ(level): For levels above 200 keV populated in 54Fe(23Na,pnαγ), assignments are based on γγ(θ)(DCO) data, and band structures, complemented by lifetime measurements for many levels

T1/2(level): From DSAM in 54Fe(23Na,pnαγ) (2012Ho16), unless otherwise stated

M(γ): From γγ(θ)(DCO) data in (23Na,pnαγ), 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 - νg9/2 band,α=+1/2.
   260.48 10  (9/2+) 19.0 µs 5 
% IT = 100
     
  1297.8 3  (13/2+) 0.90 ps 28     143.2 7 
  1037.3 3 
    0.9 5 
  100
[M1]
E2
  1154.6
   260.48
(11/2+)
(9/2+)
  2448.3 3  (17/2+) 0.534 ps +42-35    1150.5 1 
  100
(E2)
  1297.8
(13/2+)
  3635.2 4  (21/2+) 0.284 ps 14    1186.9 3 
  100
(E2)
  2448.3
(17/2+)
  4834.4 7  (25/2+) 0.326 ps 28     337.2 6 
  1199.2 10 
    6 4 
  100 25 
[M1]
[E2]
  4497.2
  3635.2
(23/2+)
(21/2+)
  6036.4 13  (29/2+) 0.374 ps 28    1202.0 10 
  100
[E2]
  4834.4
(25/2+)
  7375.6 16  (33/2+) < 0.09 ps   1339.2 10 
  100
[E2]
  6036.4
(29/2+)
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 2 - νg9/2 band,α=-1/2
  1154.6 3  (11/2+)        
  2417.9 4  (15/2+) 0.27 ps +8-7    1120.1 5 
  1263.3 6 
  100 22 
   89 22 
[M1,E2]
[E2]
  1297.8
  1154.6
(13/2+)
(11/2+)
  3451.5 4  (19/2+) 0.30 ps +8-6    1003.2 4 
  1033.6 4 
  100 18 
   91 36 

(E2)
  2448.3
  2417.9
(17/2+)
(15/2+)
  4497.2 7  (23/2+) < 0.80 ps    862.0 10 
  1045.7 7 
   42 16 
  100 16 
[M1,E2]
(E2)
  3635.2
  3451.5
(21/2+)
(19/2+)
  5686.8 8  (27/2+)     1189.6 8 
  100

  4497.2
(23/2+)
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 3 - Band based on (5/2-)
   796.8 4  (5/2-)        
  1378.67 25  (9/2-)      581.6 5 
   621.8 5 
  1378.7 4 
   30 6 
   35 8 
  100 38 
(Q)
(Q)
(Q)
   796.8
   756.98
     0.0
(5/2-)
(5/2-)
(5/2-)
  2066.2 3  (13/2-)      687.5 2 
   833.2 3 
   50 7 
  100 14 
Q
Q
  1378.67
  1233.0
(9/2-)
(9/2-)
  2975.8 4  (17/2-) 0.82 ps 8     909.6 2 
  100
(E2)
  2066.2
(13/2-)
  4039.4 4  (21/2-) 0.485 ps 14    1063.6 2 
  100
[E2]
  2975.8
(17/2-)
  5240.3 11  (25/2-) < 0.17 ps   1200.9 10 
  100
[E2]
  4039.4
(21/2-)
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 4 - Band based on (7/2-)
  1040.67 12  (7/2-) 1.0 ps 7       
  1680.7 4  (11/2-) 1.7 ps 7     640.1 4 
  100
E2
  1040.67
(7/2-)
  2481.6 4  (15/2-) 0.53 ps 28     800.9 3 
  100
(E2)
  1680.7
(11/2-)
  3427.1 5  (19/2-) 0.638 ps 21     945.5 3 
  100
(E2)
  2481.6
(15/2-)
  4504.9 7  (23/2-) 0.333 ps 14    1077.7 5 
  100
E2
  3427.1
(19/2-)
  5645.6 7  (27/2-) 0.395 ps 35    1140.7 1 
  100
[E2]
  4504.9
(23/2-)
  6947.6 11  (31/2-) < 0.17 ps   1302.0 8 
  100
[E2]
  5645.6
(27/2-)

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Additional Gamma Data:















E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityMixing
Ratio		Conversion
Coefficient		Additional Data
    48.78 (1/2-) 5.6 µs 7 
% IT = 100
    48.78 5 E2 11.86B(E2)(W.u.)=1.63 +23-18, α=11.86
   260.48 (9/2+) 19.0 µs 5 
% IT = 100
   260.5 1 [M2] 0.0405B(M2)(W.u.)=0.0763 20, α=0.0405
  1040.67 (7/2-) 1.0 ps 7     758.2 1 E2 B(E2)(W.u.)=51 +57-23
(7/2-) 1.0 ps 7     868.9 8 [E2] B(E2)(W.u.)=4.5 +53-23
(7/2-) 1.0 ps 7    1040.6 4 (M1+E2) B(E2)(W.u.)=14 +16-6, B(M1)(W.u.)=0.010 +12-5
  1154.6 (11/2+)      894.1 3 (D+Q)+1.6 3 
  1297.8 (13/2+) 0.90 ps 28     143.2 7 [M1] B(M1)(W.u.)=0.07 +6-4
(13/2+) 0.90 ps 28    1037.3 3 E2 B(E2)(W.u.)=30 +13-7
  1680.7 (11/2-) 1.7 ps 7     640.1 4 E2 B(E2)(W.u.)=1.8E2 +12-5
  2417.9 (15/2+) 0.27 ps +8-7    1120.1 5 [M1,E2] B(E2)(W.u.)=36 +15-10, B(M1)(W.u.)=0.031 +12-8
(15/2+) 0.27 ps +8-7    1263.3 6 [E2] B(E2)(W.u.)=18 +7-5
  2448.3 (17/2+) 0.534 ps +42-35    1150.5 1 (E2) B(E2)(W.u.)=30.0 21
  2481.6 (15/2-) 0.53 ps 28     800.9 3 (E2) B(E2)(W.u.)=1.9E2 +17-7
  2975.8 (17/2-) 0.82 ps 8     909.6 2 (E2) B(E2)(W.u.)=63 7
  3427.1 (19/2-) 0.638 ps 21     945.5 3 (E2) B(E2)(W.u.)=67.3 22
  3451.5 (19/2+) 0.30 ps +8-6    1003.2 4   B(E2)(W.u.)=56 +21-15, B(M1)(W.u.)=0.038 +14-10
(19/2+) 0.30 ps +8-6    1033.6 4 (E2) B(E2)(W.u.)=44 15
  3635.2 (21/2+) 0.284 ps 14    1186.9 3 (E2) B(E2)(W.u.)=48 3
  4039.4 (21/2-) 0.485 ps 14    1063.6 2 [E2] B(E2)(W.u.)=49.1 14
  4497.2 (23/2+) < 0.80 ps    862.0 10 [M1,E2] B(E2)(W.u.)>15, B(M1)(W.u.)>0.0078
(23/2+) < 0.80 ps   1045.7 7 (E2) B(E2)(W.u.)>19
  4504.9 (23/2-) 0.333 ps 14    1077.7 5 E2 B(E2)(W.u.)=67 3
  4834.4 (25/2+) 0.326 ps 28     337.2 6 [M1] B(M1)(W.u.)=0.11 +8-5
(25/2+) 0.326 ps 28    1199.2 10 [E2] B(E2)(W.u.)=38 4
  5240.3 (25/2-) < 0.17 ps   1200.9 10 [E2] B(E2)(W.u.)>76
E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityMixing
Ratio		Conversion
Coefficient		Additional Data
  5645.6 (27/2-) 0.395 ps 35    1140.7 1 [E2] B(E2)(W.u.)=43 4
  6036.4 (29/2+) 0.374 ps 28    1202.0 10 [E2] B(E2)(W.u.)=35 3
  6947.6 (31/2-) < 0.17 ps   1302.0 8 [E2] B(E2)(W.u.)>51
  7375.6 (33/2+) < 0.09 ps   1339.2 10 [E2] B(E2)(W.u.)>83

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
   260.48(9/2+) 19.0 µs 5 
% IT = 100
E(level): νg9/2 band,α=+1/2.
   796.8(5/2-)   E(level): Band based on (5/2-).
  1040.67(7/2-) 1.0 ps 7  E(level): Band based on (7/2-).
  1154.6(11/2+)   E(level): νg9/2 band,α=-1/2.
  1297.8(13/2+) 0.90 ps 28  Q(transition)<1.25 (2012Ho16).
E(level): Q(transition)<1.25 (2012Ho16). νg9/2 band,α=+1/2.
  1378.67(9/2-)   E(level): Band based on (5/2-).
  1680.7(11/2-) 1.7 ps 7  E(level): Band based on (7/2-).
  2066.2(13/2-)   E(level): Band based on (5/2-).
  2417.9(15/2+) 0.27 ps +8-7  Q(transition)=1.63 +26-19 (2012Ho16).
E(level): Q(transition)=1.63 +26-19 (2012Ho16). νg9/2 band,α=-1/2.
  2448.3(17/2+) 0.534 ps +42-35  Q(transition)=1.40 5 (2012Ho16).
E(level): Q(transition)=1.40 5 (2012Ho16). νg9/2 band,α=+1/2.
  2481.6(15/2-) 0.53 ps 28  E(level): Band based on (7/2-).
  2975.8(17/2-) 0.82 ps 8  Q(transition)=2.04 +10-9 (2012Ho16).
E(level): Q(transition)=2.04 +10-9 (2012Ho16). Band based on (5/2-).
  3427.1(19/2-) 0.638 ps 21  Q(transition)=2.03 3 (2012Ho16).
E(level): Q(transition)=2.03 3 (2012Ho16). Band based on (7/2-).
  3451.5(19/2+) 0.30 ps +8-6  Q(transition)=2.01 +25-23 (2012Ho16).
E(level): Q(transition)=2.01 +25-23 (2012Ho16). νg9/2 band,α=-1/2.
  3521.4(19/2-)   Possible 3-qp state formed by coupling of g9/2 neutron to 5- state at 3387 keV in 70Se (2012Ho16).
E(level): Possible 3-qp state formed by coupling of g9/2 neutron to 5- state at 3387 keV in 70Se (2012Ho16).
  3635.2(21/2+) 0.284 ps 14  E(level): νg9/2 band,α=+1/2.
  4039.4(21/2-) 0.485 ps 14  Q(transition)=1.70 2 (2012Ho16).
E(level): Q(transition)=1.70 2 (2012Ho16). Band based on (5/2-).
  4497.2(23/2+) < 0.80 ps Q(transition)>1.07 (2012Ho16).
E(level): Q(transition)>1.07 (2012Ho16). νg9/2 band,α=-1/2.
  4504.9(23/2-) 0.333 ps 14  Q(transition)=1.95 4 (2012Ho16).
E(level): Q(transition)=1.95 4 (2012Ho16). Band based on (7/2-).
  4834.4(25/2+) 0.326 ps 28  Q(transition)=1.46 +7-6 (2012Ho16).
E(level): Q(transition)=1.46 +7-6 (2012Ho16). νg9/2 band,α=+1/2.
  5240.3(25/2-) < 0.17 ps Q(transition)>2.08 (2012Ho16).
E(level): Q(transition)>2.08 (2012Ho16). Band based on (5/2-).
  5645.6(27/2-) 0.395 ps 35  Q(transition)=1.52 +7-6 (2012Ho16).
E(level): Q(transition)=1.52 +7-6 (2012Ho16). Band based on (7/2-).
  5686.8(27/2+)   E(level): νg9/2 band,α=-1/2.
  6036.4(29/2+) 0.374 ps 28  Q(transition)=1.36 5 (2012Ho16).
E(level): Q(transition)=1.36 5 (2012Ho16). νg9/2 band,α=+1/2.
  6947.6(31/2-) < 0.17 ps Q(transition)>1.66 (2012Ho16).
E(level): Q(transition)>1.66 (2012Ho16). Band based on (7/2-).
E(level)Jπ(level)T1/2(level)Comments
  7375.6(33/2+) < 0.09 ps Q(transition)>2.09 (2012Ho16).
E(level): Q(transition)>2.09 (2012Ho16). νg9/2 band,α=+1/2.

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Additional Gamma Comments:

E(level)E(gamma)Comments
    48.78    48.78E(γ): From 71Br ε decay
M(γ): from α(K)exp in 71Br ε decay
   171.52   122.72E(γ): From 71Br ε decay
I(γ): From 71Br ε decay
   171.6E(γ): From 71Br ε decay
I(γ): From 71Br ε decay
   260.48   260.5E(γ): From 71Br ε decay
   282.47   233.8E(γ): weighted average of 233.7 1 in ε decay and 233.9 1 in (23Na,pnαγ)
I(γ): from ε decay. Other: 100 17 from (23Na,pnαγ)
   282.4E(γ): other: 282.4 3 from (23Na,pnαγ). From 71Br ε decay
I(γ): weighted average of 38 8 in ε decay and 50 17 in (23Na,pnαγ)
   647.80   387.4E(γ): From 71Br ε decay
I(γ): From 71Br ε decay
   647.6E(γ): From 71Br ε decay
I(γ): From 71Br ε decay
   756.98   474.6E(γ): other: 474.5 6 from (23Na,pnαγ). From 71Br ε decay
I(γ): weighted average of 52 8 from 71Br ε decay and 58 13 from (23Na,pnαγ)
   756.9E(γ): From 71Br ε decay
I(γ): From 71Br ε decay
   796.8   796.7E(γ): weighted average of 796.4 4 from 71Br ε decay and 797.1 5 from (23Na,pnαγ)
  1040.67   758.2M(γ): ΔJ=2, Q from (23Na,pnαγ); M2 ruled out by RUL.
  1040.6M(γ): ΔJ=1, D+Q from (23Na,pnαγ); (M1+E2) from level scheme
  1154.6   894.1M(γ): large mixing ratio suggests M1+E2 in contrast to E1+M2.
  1297.8   143.2M(γ): no significant admixture of E2 expected from B(E2)(W.u.).
  1680.7   640.1M(γ): Q, ΔJ=2 from DCO in (23Na,pnαγ); M2 ruled out by RUL
  4834.4   337.2M(γ): no significant admixture of E2 expected from B(E2)(W.u.).

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