ADOPTED LEVELS, GAMMAS for 156Sm

Author: C. W. Reich |  Citation: Nucl. Data Sheets 113, 2537 (2012) |  Cutoff date: 1-Mar-2012 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=722 keV 8S(n)= 7241 keV 9S(p)= 9709 keV 10Q(α)= -1.64×103 keV 3
S(2n)= 13048 keV 9S(2p)= 1.811×104 keV 10
Reference: 2017WA10

References:
  A  156Pm β- decay (< 5 S)  B  (HI,xnγ)
  C  156Pm β- decay (26.70 S)  D  252Cf SF decay
  E  154Sm(t,p) 

General Comments:

In this data set, the reference "156Pm β- Decay " generally refers to the decay of the 156Pm g.s. (26.70~s) and not to the decay of the isomer (<5~s).

Some model and theory articles are:

1969Br18: deduced deformation parameter β4

1974So02: dependence of p(θ) from 154Sm(t,p) on β4 deformation

1975Bi13: 0+ level energies and B(E2)

1986Be10: Cranked shell-model calculations of the spectrum of two-quasiparticle states.

1987Ap04: nucleon correlations

1990Ha22: level energies and B(E2)

1998Ga12: HFB-based calculations of expected two-quasiparticle states.

1998Lo07: IBA-based calculations of relative Iγ values of E1 transitions from the first 1-,3-,5- levels to the g.s. band.

Levels: The level energies are primarily from the 156Pm β- decay study and secondarily from the 252Cf SF decay studies.










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0ABCDE 0+ 9.4 h 2 
% β- = 100
     
    75.89 5 ABCDE 2+ > 2 ns     75.88 5 
  100
E2
     0
0+
   249.71 7  BCDE 4+      173.75 5 
  100
E2
    75.89
2+
   517.07 8  BCDE 6+      267.32 5 
  100
E2
   249.71
4+
   803.69 22 A C E (1-)      727.6 3 
   803.9 3 
   82 18 
  100 18 


    75.89
     0
2+
0+
   871.57 22  B D  8+      354.5 2 
  100

   517.07
6+
   875.69 11   C E (3-)      626.37 20 
   799.70 10 
   17 3 
  100 11 


   249.71
    75.89
4+
2+
  1009.79 9   C   (2-)      934.00 10 
  100

    75.89
2+
  1020.62 10   C   (5-)      503.37 20 
   770.77 10 
   12 4 
  100 12 


   517.07
   249.71
6+
4+
  1068 10     E 0+        
  1110.11 11   C E (3-)      860.26 20 
  1034.25 10 
   79 7 
  100 7 


   249.71
    75.89
4+
2+
  1144.07 9   C   (4-)      894.35 10 
  100

   249.71
4+
  1256.1 5   C        380.4 4 
  100

   875.69
(3-)
  1307.4 3  B D  10+      435.8 2 
  100

   871.57
8+
  1397.55 9   CD  5- 185 ns 7     376.75 10 
   880.39 10 
  1147.84 10 
    4.4 5 
   50.7 25 
  100.0 5 
[M1,E2]
[E1]
[E1]
  1020.62
   517.07
   249.71
(5-)
6+
4+
  1441 10     E 2+        
  1509.22 9   C E 4+      992.0 10 
  1259.44 10 
  1433.70 10 
    2.4 8 
  100 5 
   67 3 



   517.07
   249.71
    75.89
6+
4+
2+
  1511.07 18    D  (6-)      113.6 2 
  100

  1397.55
5-
  1515.04 9   CDE 5- 4.5 ns 2     117.42 5 
   370.94 10 
   494.4 4 
  100 5 
    4.4 7 
    2.2 7 
M1
[M1,E2]
[M1,E2]
  1397.55
  1144.07
  1020.62
5-
(4-)
(5-)
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  1610.30 12   C E     1360.58 10 
  100

   249.71
4+
  1643.74 18    D  (7-)      132.6 2 
   246.1 2 
  230 40 
  100


  1511.07
  1397.55
(6-)
5-
  1711 10     E        
  1738.35 13   C E      223.31 10 
  100

  1515.04
5-
  1753.2 5    D  (7-)      237.8 2 ?
  100

  1515.04
5-
  1792 10     E        
  1794.32 21    D  (8-)      150.1 2 
   283.4 2 
   90 14 
  100


  1643.74
  1511.07
(7-)
(6-)
  1818.7 4  B D  12+      511.3 2 
  100

  1307.4
10+
  1851 10     E        
  1911 10     E        
  1963.41 23    D  (9-)      168.9 2 
   320.0 2 
  120 18 
  100


  1794.32
  1643.74
(8-)
(7-)
  1970 20     E        
  2033.8 3   C        518.4 4 
   524.9 4 
   90 10 
  100 10 


  1515.04
  1509.22
5-
4+
  2150.56 24    D  (10-)      187.2 2 
   356.1 2 
   50 11 
  100


  1963.41
  1794.32
(9-)
(8-)
  2199.91 11   C        684.65 10 
   690.90 10 
   37.5 18 
  100 5 


  1515.04
  1509.22
5-
4+
  2265.52 11   C        750.26 10 
   756.51 10 
  100 10 
  100 10 


  1515.04
  1509.22
5-
4+
  2341.92 12   C        827.03 10 
   832.08 20 
   50 8 
  100 17 


  1515.04
  1509.22
5-
4+
  2355.0 4    D  (11-)      204.4 2 
   391.6 2 
   80 16 
  100


  2150.56
  1963.41
(10-)
(9-)
  2400.1 4  B D  14+      581.4 2 
  100

  1818.7
12+
  2482.6 3   C       2406.7 3 
  100

    75.89
2+
  2519.04 11   C   3     1374.91 10 
  1509.12 20 
  2269.9 4 
  2443.34 20 
   82 7 
  100 11 
   25 4 
   86 7 




  1144.07
  1009.79
   249.71
    75.89
(4-)
(2-)
4+
2+
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  2526.22 9   C   3     1382.24 10 
  1516.56 10 
  2276.18 20 
  2450.17 10 
   77 4 
  100 5 
    9.5 14 
   36 4 




  1144.07
  1009.79
   249.71
    75.89
(4-)
(2-)
4+
2+
  2576.9 3   C   (12-)      222.2 2 
   426.2 2 
   35 12 
  100


  2355.0
  2150.56
(11-)
(10-)
  2609.7 3   C   (4-)     2360.0 3 
  100

   249.71
4+
  2616.51 21   C   (4-)     2366.78 20 
  100

   249.71
4+
  2677 10     E        
  2699.7 5   C       1555.6 5 
  100

  1144.07
(4-)
  2814.9 4    D  (13-)      460.0 2 
  100

  2355.0
(11-)
  3044?   D  (16+)      644?
  100

  2400.1
14+
  3069.5 4    D  (14-)      492.6 2 
  100

  2576.9
(12-)
  3335?   D  (15-)      520?
  100

  2814.9
(13-)

Jπ(level): For those levels populated only in the SF-decay studies, the listed values are based on the observed decay properties and the usual considerations of rotational-band structure in strongly deformed nuclei.

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Band Transitions:

E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - Kπ=0+ g.s. band. α=12.72~keV, β=-11.6 eV.
     0 0+ 9.4 h 2 
% β- = 100
     
    75.89 5  2+ > 2 ns     75.88 5 
  100
E2
     0
0+
   249.71 7  4+      173.75 5 
  100
E2
    75.89
2+
   517.07 8  6+      267.32 5 
  100
E2
   249.71
4+
   871.57 22  8+      354.5 2 
  100

   517.07
6+
  1307.4 3  10+      435.8 2 
  100

   871.57
8+
  1818.7 4  12+      511.3 2 
  100

  1307.4
10+
  2400.1 4  14+      581.4 2 
  100

  1818.7
12+
  3044 (16+)      644?
  100

  2400.1
14+
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 2 - Probable Kπ=1- octupole band. This band probably contains
   803.69 22  (1-)        
   875.69 11  (3-)      626.37 20 
   799.70 10 
   17 3 
  100 11 


   249.71
    75.89
4+
2+
  1009.79 9  (2-)      934.00 10 
  100

    75.89
2+
  1020.62 10  (5-)      503.37 20 
   770.77 10 
   12 4 
  100 12 


   517.07
   249.71
6+
4+
  1144.07 9  (4-)      894.35 10 
  100

   249.71
4+
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 3 - Bandhead of the first excited Kπ=0+ band.
  1068 10  0+        
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 4 - Possible 3- member of the Kπ=0- octupole band.
  1110.11 11  (3-)        
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 5 - Kπ=5- band, α=1 branch. Dominant
  1397.55 9  5- 185 ns 7       
  1643.74 18  (7-)      132.6 2 
   246.1 2 
  230 40 
  100


  1511.07
  1397.55
(6-)
5-
  1963.41 23  (9-)      168.9 2 
   320.0 2 
  120 18 
  100


  1794.32
  1643.74
(8-)
(7-)
  2355.0 4  (11-)      204.4 2 
   391.6 2 
   80 16 
  100


  2150.56
  1963.41
(10-)
(9-)
  2814.9 4  (13-)      460.0 2 
  100

  2355.0
(11-)
  3335 (15-)      520?
  100

  2814.9
(13-)
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 6 - Kπ=5- band, α=0 branch. See the comments on the α=1
  1511.07 18  (6-)        
  1794.32 21  (8-)      150.1 2 
   283.4 2 
   90 14 
  100


  1643.74
  1511.07
(7-)
(6-)
  2150.56 24  (10-)      187.2 2 
   356.1 2 
   50 11 
  100


  1963.41
  1794.32
(9-)
(8-)
  2576.9 3  (12-)      222.2 2 
   426.2 2 
   35 12 
  100


  2355.0
  2150.56
(11-)
(10-)
  3069.5 4  (14-)      492.6 2 
  100

  2576.9
(12-)
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 7 - Kπ=5- band. Dominant conf=π5/2[532]+π5/2[413].
  1515.04 9  5- 4.5 ns 2       
  1753.2 5  (7-)      237.8 2 ?
  100

  1515.04
5-
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 8 - Probable Kπ=4+ bandhead. Probable conf is
  1509.22 9  4+        

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
    75.89 2+ > 2 ns     75.88 5 E26.51B(E2)(W.u.)<300, α=6.51
   249.71 4+      173.75 5 E20.336α=0.336
   517.07 6+      267.32 5 E20.0808α=0.0808
  1397.55 5- 185 ns 7     376.75 10 [M1,E2]0.036α=0.036 9
5- 185 ns 7     880.39 10 [E1]0.00132B(E1)(W.u.)=6.0E-10 4, α=0.00132
5- 185 ns 7    1147.84 10 [E1]0.00081B(E1)(W.u.)=5.4E-10 2, α=0.00081
  1515.04 5- 4.5 ns 2     117.42 5 M11.068B(M1)(W.u.)=0.00142 12, α=1.068
5- 4.5 ns 2     370.94 10 [M1,E2]0.038α=0.038 9
5- 4.5 ns 2     494.4 4 [M1,E2]0.018α=0.018 5

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     00+ 9.4 h 2 
% β- = 100
E(level): Kπ=0+ g.s. band. α=12.72~keV, β=-11.6 eV.
    75.892+ > 2 ns E(level): Kπ=0+ g.s. band. α=12.72~keV, β=-11.6 eV.
   249.714+   E(level): Kπ=0+ g.s. band. α=12.72~keV, β=-11.6 eV.
   517.076+   E(level): Kπ=0+ g.s. band. α=12.72~keV, β=-11.6 eV.
   803.69(1-)   XREF: E(810).
E(level): Probable Kπ=1- octupole band. This band probably contains.
   871.578+   E(level): Kπ=0+ g.s. band. α=12.72~keV, β=-11.6 eV.
   875.69(3-)   E(level): Probable Kπ=1- octupole band. This band probably contains.
  1009.79(2-)   E(level): Probable Kπ=1- octupole band. This band probably contains.
  1020.62(5-)   E(level): Probable Kπ=1- octupole band. This band probably contains.
  10680+   E(level): Bandhead of the first excited Kπ=0+ band.
  1110.11(3-)   XREF: E(1120).
E(level): Possible 3- member of the Kπ=0- octupole band.
  1144.07(4-)   E(level): Probable Kπ=1- octupole band. This band probably contains.
  1307.410+   E(level): Kπ=0+ g.s. band. α=12.72~keV, β=-11.6 eV.
  1397.555- 185 ns 7  E(level): Kπ=5- band, α=1 branch. Dominant.
  1509.224+   E(level): Probable Kπ=4+ bandhead. Probable conf is.
  1511.07(6-)   E(level): Kπ=5- band, α=0 branch. See the comments on the α=1.
  1515.045- 4.5 ns 2  E(level): Kπ=5- band. Dominant conf=π5/2[532]+π5/2[413].
  1643.74(7-)   E(level): Kπ=5- band, α=1 branch. Dominant.
  1753.2(7-)   E(level): Kπ=5- band. Dominant conf=π5/2[532]+π5/2[413].
  1794.32(8-)   E(level): Kπ=5- band, α=0 branch. See the comments on the α=1.
  1818.712+   E(level): Kπ=0+ g.s. band. α=12.72~keV, β=-11.6 eV.
  1963.41(9-)   E(level): Kπ=5- band, α=1 branch. Dominant.
  2150.56(10-)   E(level): Kπ=5- band, α=0 branch. See the comments on the α=1.
  2355.0(11-)   E(level): Kπ=5- band, α=1 branch. Dominant.
  2400.114+   E(level): Kπ=0+ g.s. band. α=12.72~keV, β=-11.6 eV.
E(level)Jπ(level)T1/2(level)Comments
  2576.9(12-)   E(level): Kπ=5- band, α=0 branch. See the comments on the α=1.
  2814.9(13-)   E(level): Kπ=5- band, α=1 branch. Dominant.
  3044(16+)   E(level): Kπ=0+ g.s. band. α=12.72~keV, β=-11.6 eV.
  3069.5(14-)   E(level): Kπ=5- band, α=0 branch. See the comments on the α=1.
  3335(15-)   E(level): Kπ=5- band, α=1 branch. Dominant.

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Additional Gamma Comments:

E(level)E(gamma)Comments
  1397.55   880.39I(γ): Value from 1990He11, 156Pm β- decay. From 252Cf SF decay, 1995Zh15 report Iγ=152, while 1998Ga12 report Iγ=87.

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