ADOPTED LEVELS, GAMMAS for 244Cm

Author: C.D. Nesaraja |  Citation: Nucl. Data Sheets 146, 387 (2017) |  Cutoff date: 31-Aug-2017 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-2262 keV 14S(n)= 6801.4 keV 10S(p)= 6012.1 keV 14Q(α)= 5901.60 keV 5
Reference: 2017WA10

References:
  A  248Cf α decay  B  244Am β- decay (10.1 H)
  C  244Am β- decay (26 M)  D  Coulomb Excitation
  E  244Bk ε decay 

General Comments:

Identification:

1950Re55: Produced by neutron irradiation on 241Am. Curium was chemically separated and its isotopic composition determined with a 60|’ focusing mass spectrograph.

Systematic studies/Compilation/Evaluation:

2017He08: Review of properties of spontaneous fission

2017Pr04: Systematics of B(E2) revisited using elemental data fit parameters

2016Pr01: Compilation, evaluation for B(E2), T1/2 and deformation parameter

Theoretical studies, calculations:

2017Vi02, 2017Ad03: Calculated cluster decay half-life

2016Sa53, 2015Ba24, 2014De43, 2014Is03, 2013Ra05, 2013Se17, 2013Is13, 2012Is08, 2011Qi06, 2009De32, 2009Ni06, 2007Pe30,

2010Sa09, 2008Xu06, 2005Sh42, 2005Re16, 2005Xu01, 2004Ro01, 1990Bh02, 1989St20, 1978Po09, 1976Ra02, 1976Re09, 1972We09: Calculated spontaneous fission half-lives

2017Zh03, 2017Ph01, 2016Sa16, 2016Su09, 2006De05, 2005Sh42, Calculated α decay half-life

2016Sa20, 2014De43: Calculated energy levels, J, π, deformation parameters, B(E2)

2013De12, 1995Mo29, 1984Eg01, 1983Bo15, 1982Du16, 1982Eg01, 1978Po01, 1977Mi11, 1976Iv04: Calculated deformation parameters

1998Bu18: Calculated B(E2 down; 2+ to 0+), B(E3 up; 0+ to 3-) and B(E4 up; 0+ to 4+) for 244Cm as a 32Si+ 212Pb cluster system. The calculated B(E2 down; 2+ to 0+), B(E3 up; 0+ to 3-) agree with experiments. However, calculated B(E4 up; 0+ to 4+) does not agree with the measured value. The authors strongly recommend confirmation of the B(E4) experimental results.

2013De12: Calculated deformation parameters, and predicted α transitions Jπ= 2+, 4+, 6+ states

2013Li30: Calculated two-quasiparticle high K-state with ν5/2+[622]~#ν7/2-[624] configuration. Predicted the octupole deformed high K-isomeric state at 0.976 MeV

2010Wa31: Calculated relative intensities of α decay to the rotational states in the framework of the generalized liquid drop model (GLDM) and improved Royer’s formula.

2010Wa23: Calculated branching ratios of α-decay to the ground-state rotational bands as well as the high-lying excited states within the framework of the generalized liquid drop model (GLDM) and an improved Royer’s formula

2002Pr01: Calculated excitation energies of quadrupole-vibrational states, calculated B(E2)(0+ gs to 2+)

2002Re31: Calculated g.s properties based on the deformed relativistic (RMF) mean-field theory

1990Co26: Systematic behavior of the first 3- octupole-vibrational state was studied, and fragmentation and its dependence on β2 were analyzed

1989Pi03: The pairing interaction strength for protons and neutrons was deduced from empirical odd-even mass differences.

1984Eg01: Analysis of yrast states, and alignment

1982Li01, 1978Po01: Calculated electric quadrupole and hexadecapole moments

1976Iv04: Low-lying two-quasi particle neutron states and single phonon states were studied and excitation energies were calculated using a semi-microscopic method.

1983Bo15: Calculated equilibrium deformations and static electric moment

1993Sa05, 1988Ri07: Calculated B(E2)(0+ gs to 2+)

1988Bh04: Calculated B(E2)(2+ to 0+ gs)

1978Po01: Calculated moment of inertia and collective gyromagnetic ratio of the ground state

1982Eg01, 1980Du07: Calculated moment of inertia

1991Pi05: Studied nuclear stretching

1974Ma17, 1975Vo06, 1981Be59: Calculated density of states

1974No17: Calculated gamma width of highly excited nuclei

1979Po23: Half-life for α decay was calculated by considering this decay mode as a form of fission.

1997Mo25: Calculated the α half-life based on the finite-range droplet model and folded-Yukawa single-particle potential.

1977VaYN: Review of properties of spontaneously fissioning isomers

2014Ji14, 2014Lu01, 2014Ro09, 2009Mo18, 2012Ja08, 2011Zh36, 1993Oh03 1995Ra07, 1992Bh03, 1990Bh02, 1981Re06, 1980Ku14, 1977Pr10, 1976Re09, 1974Ju02, 1973Br04, 1973Al08, 1972Ma11, 1972Mo27, 1971Pa33, 1971Br39 : Calculated fission barriers heights

1980Bj02: Review, evaluation and recommended parameters for fission barriers.

1972Go19: Influence of axially asymmetric deformation on fission barriers

2000Du06: Influence of triaxial shape on the ground-state binding energy and on the fission barriers

1978Po01: Calculated quadrupole and hexadecapole deformations, electric moments, and gyromagnetic ratio for the fission isomeric state

1976Ma42: Calculated giant octupole resonances and γ strength

1977Ky01: Studied semi-microscopic description for giant quadrupole resonances and calculated E2 strengths for various deformed nuclei

Experiments involving fission:

1999Pa55, 1983Ca02, 1973Go46, 1973Da34, 1972Fl13: Measured fission yields

1989Sa03: Fragment-fragment coincidence data following 232Th(8.4-MeV 12C,X) reaction were interpreted as being from decay of the excited compound nucleus 244Cm.

1989Au01: Coincidence spectra of α particles and fission fragments measured following 232Th(85-MeV 12C,X) reaction;

1990Li26: Angular distribution of fission fragments following 232Th(78-MeV 12C,X) reaction were measured; saddle point effective moment of inertia was deduced.

1993Oh03: Proton-induced fission data, 243Am(p,F); deduced fission parameters; competition of fission to neutron emission.

1995Da18: Angular distributions of fission products in 237Np(α,F).

1986Ca14, 1972Al07, 1974Al26: Measured prompt neutrons as a function of fragment kinetic energy 1983Sc07: Coincidences between prompt neutron and fission fragments










E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
     0.0ABCDE 0+ 18.11 y 3 
% α = 100
% SF = 1.37×10-4 2
     
    42.957 9 ABCDE 2+ 97 ps 5      42.965 10 
  100
E2
     0.0
0+
   142.340 10 AB DE 4+       99.383 4 
  100
E2
    42.957
2+
   296.204 10  B    6+      153.863 2 
  100
E2
   142.340
4+
   501.779 11  B    8+      205.575 4 
  100
(E2)
   296.204
6+
   933.8 3 ?    E (3,4)      891.0 4 
  100

    42.957
2+
   963.6 3 ?    E (2,3)      ≈30S
   920.8 5 
 
 


   933.8
    42.957
(3,4)
2+
   970 4    D  (2+,3-)        
   984.914 15   C   0+      941.949 18 
   984.919 20 
 
 

E0
    42.957
     0.0
2+
0+
  1020.756 22 ?  C   (2+)      977.796 20 
 
E0(+M1+E2)
    42.957
2+
  1038 6    D  (2+,3-)        
  1040.181 11  B    6+ 34 ms 2 
% IT = 100
   538.400 16 
   743.971 5 
   897.848 7 
    1.0 2 
  100 27 
   42 12 
(E2)
M1+E2
E2
   501.779
   296.204
   142.340
8+
6+
4+
  1084.199 12 ?  C   (1,2+)     1041.278 22 
  1084.181 14 
   53 18 
  100 32 


    42.957
     0.0
2+
0+
  1105.909 20 ?  C   (1,2)     1062.953 18 
  1105.43 19 
  100 31 
   15 8 


    42.957
     0.0
2+
0+
  1150.98 24 ?    E (4)      187.4 3 
   217.3 3 
  1107.6 5 
   16.5 5 
  100
    2.4 1 



   963.6
   933.8
    42.957
(2,3)
(3,4)
2+
  1187 4    D  (2+,3-)        
  1220.16 10 ?    E     1177.2 1 
  100

    42.957
2+
  1295.59 25 ?    E (3,4)      144.6 2 
  1153.4 6 
  1252.5 7 
 
  100 3 
   27 1 



  1150.98
   142.340
    42.957
(4)
4+
2+
E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
  1327.7 3 ?    E      176.7 2 
  100

  1150.98
(4)
  1654.3 5 ?    E      690.7 3 
  100

   963.6
(2,3)
  1785.37 21 ?    E      489.8 4 
   565.2 2 
  100 4 
   12.9 21 


  1295.59
  1220.16
(3,4)

   0+X      > 500 ns
% SF ≤ 100
     
   0+YS      ≤ 5 ps      

E(level): From least-squares fit to Eγ data by the evaluator.

E(γ): From 244Am β decays, measured by 1984Ho02.

I(γ): Relative photon intensity normalized to 100 at the strongest photon deexciting each level. For levels with multiple gamma transitions, the Iγ’s were taken from the decay datasets: γ’s from 1040 level (244Am β- decay (10.1 h)), γ’s from 1084 and 1106 levels (244Am β- decay (26 m)), γ’s from 1151, 1296 and 1786 levels (244Bk ε decay)

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Band Transitions:

E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - K=0 Ground-state band.
     0.0 0+ 18.11 y 3 
% α = 100
% SF = 1.37×10-4 2
     
    42.957 9  2+ 97 ps 5      42.965 10 
  100
E2
     0.0
0+
   142.340 10  4+       99.383 4 
  100
E2
    42.957
2+
   296.204 10  6+      153.863 2 
  100
E2
   142.340
4+
   501.779 11  8+      205.575 4 
  100
(E2)
   296.204
6+

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Additional Gamma Data:















E(level)
(keV)
Jπ(level)T1/2(level)E(γ)
(keV)
MultipolarityMixing
Ratio
Conversion
Coefficient
Additional Data
    42.957 2+ 97 ps 5      42.965 10 E2 1050B(E2)(W.u.)=419 23, α=1050, α(L)=760 11, α(M)=214 3, α(N)=59.5 9, α(O)=14.38 21, α(P)=2.35 4, α(Q)=0.00578 9
   142.340 4+       99.383 4 E2 19.3α=19.3, α(L)=13.93 20, α(M)=3.94 6, α(N)=1.095 16, α(O)=0.265 4, α(P)=0.0441 7, α(Q)=0.000180 3
   296.204 6+      153.863 2 E2 2.81α=2.81, α(K)=0.1741 25, α(L)=1.90 3, α(M)=0.536 8, α(N)=0.1492 21, α(O)=0.0362 5, α(P)=0.00610 9, α(Q)=3.92×10-5 6
   501.779 8+      205.575 4 (E2) 0.887α=0.887, α(K)=0.1409 20, α(L)=0.541 8, α(M)=0.1514 22, α(N)=0.0421 6, α(O)=0.01025 15, α(P)=0.001746 25, α(Q)=1.644×10-5 23
  1020.756 (2+)      977.796 20 E0(+M1+E2) 0.036α=0.036 22, α(K)=0.028 18, α(L)=0.0060 32, α(M)=0.00148 75, α(N)=4.1×10-4 21, α(O)=1.03E-4 53, α(P)=2.0E-5 11, α(Q)=1.34E-6 84
  1040.181 6+ 34 ms 2 
% IT = 100
   538.400 16 (E2) 0.0495B(E2)(W.u.)=2.7E-11 8, α=0.0495, α(K)=0.0292 4, α(L)=0.01492 21, α(M)=0.00396 6, α(N)=0.001096 16, α(O)=0.000271 4, α(P)=4.93E-5 7, α(Q)=1.637E-6 23
6+ 34 ms 2 
% IT = 100
   743.971 5 M1+E2-0.92 80.077B(E2)(W.u.)=2.4E-10 9, B(M1)(W.u.)=5.6E-13 20, α=0.077 5, α(K)=0.059 4, α(L)=0.0130 7, α(M)=0.00321 15, α(N)=0.00088 4, α(O)=0.000223 11, α(P)=4.34E-5 21, α(Q)=2.86E-6 17
6+ 34 ms 2 
% IT = 100
   897.848 7 E2 0.01697B(E2)(W.u.)=9.E-11 4, α=0.01697, α(K)=0.01215 17, α(L)=0.00358 5, α(M)=0.000912 13, α(N)=0.000251 4, α(O)=6.29E-5 9, α(P)=1.186E-5 17, α(Q)=5.93E-7 9

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.00+ 18.11 y 3 
% α = 100
% SF = 1.37×10-4 2
%SF is deduced from the adopted total and partial half-lives.
E(level): %SF is deduced from the adopted total and partial half-lives. K=0 Ground-state band.
    42.9572+ 97 ps 5  B(E2)=14.58 19 (1973Be44)
E(level): K=0 Ground-state band.
   142.3404+   E(level): K=0 Ground-state band.
   296.2046+   E(level): K=0 Ground-state band.
   501.7798+   E(level): K=0 Ground-state band.
   970(2+,3-)   E(level): See Coulomb excitation for extracted B(E2),B(E3) values.
Jπ(level): From Coulomb excitation.
  1020.756(2+)   This level is tentatively assigned. An alternate placement of the 977.796-keV transition would be to de excite a 977.8-keV 0+ level to the ground state (1984Ho02).
E(level): This level is tentatively assigned. An alternate placement of the 977.796-keV transition would be to de excite a 977.8-keV 0+ level to the ground state (1984Ho02).
  1038(2+,3-)   E(level): See Coulomb excitation for extracted B(E2),B(E3) values.
Jπ(level): From Coulomb excitation.
  1040.1816+ 34 ms 2 
% IT = 100
T1/2(SF)>140 y (1964Va04). The authors attributed their observed SF activities to the 244Cm ground state SF decay.
E(level): T1/2(SF)>140 y (1964Va04). The authors attributed their observed SF activities to the 244Cm ground state SF decay.
  1084.199(1,2+)   E(level): Tentative levels proposed by 1984Ho02.
  1105.909(1,2)   See 244Am β- decay (26-min) data set for comments on the multipolarities of these transitions.
E(level): See 244Am β- decay (26-min) data set for comments on the multipolarities of these transitions. Tentative levels proposed by 1984Ho02.
  1187(2+,3-)   E(level): See Coulomb excitation for extracted B(E2),B(E3) values.
Jπ(level): From Coulomb excitation.
   0+X > 500 ns
% SF ≤ 100
Only SF decay observed (1969MeZX).
E(level): Only SF decay observed (1969MeZX).
   0+Y ≤ 5 ps For a systematics of fission isomer half-lives see 1975Me28.

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Additional Gamma Comments:

E(level)E(gamma)Comments
   963.6    30E(γ): Assumed by 2014So17 based on the coincidence between 187.4γ and the 891.0γ

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