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 14 | S(n)= 6801.4 keV 10 | S(p)= 6012.1 keV 14 | Q(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 |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
0.0 | ABCDE | 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) | XREF | Jπ(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)
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+ |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Mixing Ratio | Conversion Coefficient | Additional Data |
42.957 | 2+ | 97 ps 5 | 42.965 10 | E2 | 1050 | B(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 | 19.3 | α=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 | 2.81 | α=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) | 0.887 | α=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) | 0.036 | α=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) | 0.0495 | B(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 8 | 0.077 | B(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 | 0.01697 | B(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 |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0.0 | 0+ | 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. |
42.957 | 2+ | 97 ps 5 | B(E2)=14.58 19 (1973Be44) E(level): K=0 Ground-state band. |
142.340 | 4+ | E(level): K=0 Ground-state band. | |
296.204 | 6+ | E(level): K=0 Ground-state band. | |
501.779 | 8+ | 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. | |
1040.181 | 6+ | 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. |
E(level) | E(gamma) | Comments |
963.6 | 30 | E(γ): Assumed by 2014So17 based on the coincidence between 187.4γ and the 891.0γ |
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