ADOPTED LEVELS, GAMMAS for 243Am
Authors: C.D. Nesaraja, E.A. Mccutchan | Citation: Nucl. Data Sheets 121, 695 (2014) | Cutoff date: 30-Sep-2013
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-7.5 keV 17 | S(n)= 6364.9 keV 14 | S(p)= 4831.2 keV 16 | Q(α)= 5438.8 keV 10 | ||
| Reference: 2012WA38 |
| References: | |||
| A | 247Bk α decay | B | 243Pu β- decay |
| C | Coulomb Excitation | D | 242Pu(3He,d),(α,t) |
| E | 243Cm ε decay | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | ABCDE | 5/2- | 7364 y 22 % α = 100 % SF = 3.7×10-9 9 | |||||
| 42.20 22 | ABC | 7/2- | ≈ 40 ps | 42.2 5 | 100 | M1+E2 | 0.0 | 5/2- |
| 84.00 16 | AB D | 5/2+ | 2.34 ns 7 | 41.8 2 84.0 2 | 3.3 3 100 | [E1] E1 | 42.20 0.0 | 7/2- 5/2- |
| 96.4 4 | B D | 9/2- | 54 1 96.4 4 | ≤100 60 10 | [M1+E2] (E2) | 42.20 0.0 | 7/2- 5/2- | |
| 109.22 17 | AB | 7/2+ | 25.2 3 S 67 1 109.2 2 | 100 50 70 7 | [E1] [E1] | 84.00 42.20 0.0 | 5/2+ 7/2- 5/2- | |
| 143.39 24 | AB D | (9/2+) | ≈34 101.3 | | 109.22 42.20 | 7/2+ 7/2- | ||
| 162.3 10 | C | 11/2- | ||||||
| 189.4 6 | AB | (11/2+) | ||||||
| 238 1 | C | 13/2- | ||||||
| 244 2 | D | (13/2+) | ||||||
| 265 10 | A D | 3/2- | 265 10 | 100 | (M1+E2) | 0.0 | 5/2- | |
| 300 2 | A D | (5/2-) | ||||||
| 345 1 | A D | (7/2-) | ||||||
| 383 2 | D | |||||||
| 407.1 5 | B | 407.2 5 | 100 | 0.0 | 5/2- | |||
| 423 5 | D | |||||||
| 445 3 | D | |||||||
| 465.64 18 | B D | 7/2+ | 322.3 2 356.4 2 381.6 2 423.2 2 ? 465.7 5 | 4.8 4 23.2 12 100 4 ≤0.04 | [M1] M1 M1 | 143.39 109.22 84.00 42.20 0.0 | (9/2+) 7/2+ 5/2+ 7/2- 5/2- | |
| 466 5 | D | (11/2-) | ||||||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 532.4 3 | B D | (9/2+) | 343.0 5 388.9 3 423.2 3 448.7 5 | ≈11 37 7 100 11 ≈1.8 | 189.4 143.39 109.22 84.00 | (11/2+) (9/2+) 7/2+ 5/2+ | ||
| 586 5 | D | |||||||
| 704 2 | D | (13/2+) | ||||||
| 724 4 | D | |||||||
| 933 4 | D | |||||||
| 977 3 | D | (9/2-) | ||||||
| 1053 3 | D | |||||||
| 1123 3 | D | |||||||
| 1174 3 | D | |||||||
| 1222 3 | D | |||||||
| 2.3E+3 2 | 5.5 µs 5 % SF ≤ 100 | |||||||
E(level): From least square fit of adopted γ energies and levels observed in Coulomb excitation and (3He,d), (α,t) reactions.
Jπ(level): Assignments derived from (3He,d), (α,t) reactions are based on comparison of experimental and theoretical spectroscopic factors, and on (α,t)/(3He,d) cross-section ratios which were used to obtain information on the L values.
M(γ): From 243Pu β- and 247Bk α decays.
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 1 - 5/2[523] band MEMBER. α=6.0. | |||||||
| 0.0 | 5/2- | 7364 y 22 % α = 100 % SF = 3.7×10-9 9 | |||||
| 42.20 22 | 7/2- | ≈ 40 ps | 42.2 5 | 100 | M1+E2 | 0.0 | 5/2- |
| 96.4 4 | 9/2- | 54 1 96.4 4 | ≤100 60 10 | [M1+E2] (E2) | 42.20 0.0 | 7/2- 5/2- | |
| 162.3 10 | 11/2- | ||||||
| 238 1 | 13/2- | ||||||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 2 - 5/2[642] band MEMBER. | |||||||
| 84.00 16 | 5/2+ | 2.34 ns 7 | |||||
| 109.22 17 | 7/2+ | 25.2 3 S 67 1 109.2 2 | 100 50 70 7 | [E1] [E1] | 84.00 42.20 0.0 | 5/2+ 7/2- 5/2- | |
| 143.39 24 | (9/2+) | ≈34 101.3 | | 109.22 42.20 | 7/2+ 7/2- | ||
| 189.4 6 | (11/2+) | ||||||
| 244 2 | (13/2+) | ||||||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 3 - 3/2[521] band MEMBER. α=6.7. | |||||||
| 265 10 | 3/2- | ||||||
| 300 2 | (5/2-) | ||||||
| 345 1 | (7/2-) | ||||||
| 466 5 | (11/2-) | ||||||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 4 - 7/2[633] band MEMBER. α=7.4. | |||||||
| 465.64 18 | 7/2+ | ||||||
| 532.4 3 | (9/2+) | 343.0 5 388.9 3 423.2 3 448.7 5 | ≈11 37 7 100 11 ≈1.8 | 189.4 143.39 109.22 84.00 | (11/2+) (9/2+) 7/2+ 5/2+ | ||
| 704 2 | (13/2+) | ||||||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Mixing Ratio | Conversion Coefficient | Additional Data |
| 42.20 | 7/2- | ≈ 40 ps | 42.2 5 | M1+E2 | 0.28 AP | 149 | B(E2)(W.u.)≈570, B(M1)(W.u.)≈0.045, α149 AP, α(L)≈110, α(M)≈28.9, α(N)≈7.9, α(O)≈1.94, α(P)≈0.336, α(Q)≈0.0116 |
| 84.00 | 5/2+ | 2.34 ns 7 | 41.8 2 | [E1] | 1.33 | B(E1)(W.u.)=2.6E-5 3, α=1.33 3, α(L)=0.991 19, α(M)=0.252 5, α(N)=0.0675 13, α(O)=0.0157 3, α(P)=0.00231 5, α(Q)=6.32E-5 11 | |
| 5/2+ | 2.34 ns 7 | 84.0 2 | E1 | 0.214 | B(E1)(W.u.)=9.7E-5 3, α=0.214 4, α(L)=0.1605 25, α(M)=0.0397 6, α(N)=0.01072 17, α(O)=0.00257 4, α(P)=0.000422 7, α(Q)=1.494E-5 23 | ||
| 96.4 | 9/2- | 54 1 | [M1+E2] | 1.8×102 | α=1.8×102 15, α(L)=1.3E2 11, α(M)=4.E1 3, α(N)=10 9, α(O)=2.4 20, α(P)=0.4 3, α(Q)=0.0037 22 | ||
| 9/2- | 96.4 4 | (E2) | 20.4 | α=20.4 5, α(L)=14.8 4, α(M)=4.15 10, α(N)=1.15 3, α(O)=0.274 7, α(P)=0.0438 11, α(Q)=0.000152 4 | |||
| 109.22 | 7/2+ | 67 1 | [E1] | 0.386 | α=0.386 17, α(L)=0.290 13, α(M)=0.072 3, α(N)=0.0194 9, α(O)=0.00463 20, α(P)=0.00074 3, α(Q)=2.41×10-5 9 | ||
| 7/2+ | 109.2 2 | [E1] | 0.1083 | α=0.1083, α(L)=0.0813 12, α(M)=0.0200 3, α(N)=0.00541 8, α(O)=0.001310 20, α(P)=0.000221 4, α(Q)=8.52×10-6 13 | |||
| 265 | 3/2- | 265 10 | (M1+E2) | 1.1 | α=1.1 8, α(K)=0.8 7, α(L)=0.23 7, α(M)=0.060 15, α(N)=0.016 4, α(O)=0.0041 11, α(P)=0.00074 23, α(Q)=3.E-5 3 | ||
| 465.64 | 7/2+ | 322.3 2 | [M1] | 1.071 | α=1.071, α(K)=0.845 12, α(L)=0.1699 24, α(M)=0.0414 6, α(N)=0.01131 16, α(O)=0.00285 4, α(P)=0.000544 8, α(Q)=3.45×10-5 5 | ||
| 7/2+ | 356.4 2 | M1 | 0.812 | α=0.812, α(K)=0.641 9, α(L)=0.1286 19, α(M)=0.0313 5, α(N)=0.00856 12, α(O)=0.00215 3, α(P)=0.000412 6, α(Q)=2.61×10-5 4 | |||
| 7/2+ | 381.6 2 | M1 | 0.674 | α=0.674, α(K)=0.532 8, α(L)=0.1066 15, α(M)=0.0259 4, α(N)=0.00709 10, α(O)=0.00178 3, α(P)=0.000341 5, α(Q)=2.16×10-5 3 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 5/2- | 7364 y 22 % α = 100 % SF = 3.7×10-9 9 | Q=+2.86 3, μ=+1.503 14 T1/2(SF)=2.0×1014 y 5 (1966Gv01). Other measurement: 3.3×1013 y 3 (1966Al23). Measurement of 1966Gv01 was recommended by 1989Ho24. E(level): T1/2(SF)=2.0×1014 y 5 (1966Gv01). Other measurement: 3.3×1013 y 3 (1966Al23). Measurement of 1966Gv01 was recommended by 1989Ho24. 5/2[523] band MEMBER. α=6.0. |
| 42.20 | 7/2- | ≈ 40 ps | E(level): 5/2[523] band MEMBER. α=6.0. |
| 84.00 | 5/2+ | 2.34 ns 7 | Q=4.1 12, μ=+2.9 2 The resonance of the 84.0γ was observed, and from the measured isomeric shift, Δ<r2>/<r2>=-9×10-4 3 was calculated by 1969Ka17. E(level): The resonance of the 84.0γ was observed, and from the measured isomeric shift, Δ<r2>/<r2>=-9×10-4 3 was calculated by 1969Ka17. 5/2[642] band MEMBER. |
| 96.4 | 9/2- | E(level): 5/2[523] band MEMBER. α=6.0. | |
| 109.22 | 7/2+ | E(level): 5/2[642] band MEMBER. | |
| 143.39 | (9/2+) | E(level): 5/2[642] band MEMBER. | |
| 162.3 | 11/2- | E(level): 5/2[523] band MEMBER. α=6.0. | |
| 189.4 | (11/2+) | E(level): 5/2[642] band MEMBER. | |
| 238 | 13/2- | E(level): 5/2[523] band MEMBER. α=6.0. | |
| 244 | (13/2+) | E(level): 5/2[642] band MEMBER. | |
| 265 | 3/2- | E(level): 3/2[521] band MEMBER. α=6.7. | |
| 300 | (5/2-) | E(level): 3/2[521] band MEMBER. α=6.7. | |
| 345 | (7/2-) | E(level): 3/2[521] band MEMBER. α=6.7. | |
| 465.64 | 7/2+ | XREF: d(?). E(level): 7/2[633] band MEMBER. α=7.4. | |
| 466 | (11/2-) | E(level): 3/2[521] band MEMBER. α=6.7. | |
| 532.4 | (9/2+) | E(level): 7/2[633] band MEMBER. α=7.4. | |
| 704 | (13/2+) | E(level): 7/2[633] band MEMBER. α=7.4. | |
| 2.3E+3 | 5.5 µs 5 % SF ≤ 100 | Second minimum of the fission barrier was calculated: E=1.80 MeV (1972We09), 2.10 MeV 20 (1973Br04), 2.0 MeV (1987Gu03), 1.80 MeV (1990Bh02). E(level): Second minimum of the fission barrier was calculated: E=1.80 MeV (1972We09), 2.10 MeV 20 (1973Br04), 2.0 MeV (1987Gu03), 1.80 MeV (1990Bh02). |
| E(level) | E(gamma) | Comments |
| 109.22 | 25.2 | E(γ): γ not observed. Eγ is from level scheme in 243Pu β- decay |
| 143.39 | 101.3 | E(γ): γ was obscured by Kα2 x-ray in the 243Pu β- decay. Energy is from level scheme. Authors (1969Ho10) report excess value of the observed IKα2 x-ray/ IKα{1- x-ray to be 101 γ intensity |
| 465.64 | 423.2 | E(γ): Multiply placed |
| 532.4 | 423.2 | E(γ): Multiply placed |
Theoretical and Systematic studies:
2013Ta07: Partial T1/2 for cluster decay of 243Am using semi-empirical model
2012Ni16: α decay T1/2 for transitions from ground state to favored rotational bands using Multicluster Channel Model
2012Ro34: T1/2 and fission barriers with a generalized liquid drop model.
2012Pr13: Maxwellian-averaged cross sections and their uncertainties
2012Sa05: Partial T1/2, α-branching ratio to individual residual states using CPPMDN (Coulomb and proximity potential model for deformed nuclei).
2012Ta10: Partial T1/2, Q(β-)values, branching ratios using a semi-empirical with the one-parameter model dependence on cluster radius
2011He12: Compilation of T1/2, Jπ, and energy for long lived isomers for Z|>82
2011Zh36: Systematic analysis and calculated partial half life of α decay to members of favored band. Accurate expressions are proposed for the evaluation of partial half-lives of these transitions based on microscopic quantum tunneling theory.
2010Ni02: Systematic analysis calculations of T1/2 and relative intensities of α decay within the generalized density-dependent cluster model.
2009Mo18: Qε-values and fission barriers in the daughter nuclides using the macroscopic-microscopic finite-range liquid-drop model
2007Oh07,2007Ro08,2004Ro01,1985Lo17: Spontaneous fission T1/2
2003De17: Alpha-decay anisotropy
2001YaZU,1992Gr16,1990Bh02,1987Gu03,1984Ku05,1984Oh09,1981Re06, 1980Ku14,1980Bj02,1976Ga11,1974Ba73,1974Ga41,1973Br04,1972We09: Fission-barrier parameters
2000CaZU: Cross-sections for 242Am(n,γ) and 242Am(n,f) for E(n)<20 MeV
1985Po12: Studied decay by heavy-ion emission and partial half-life for this mode
1994Pi12,1984Ni04: Ternary fission with light particle emission
1988Io05: Probability of pion decay relative to spontaneous fission
1982Be59: Level densities
1980Ka41: Hindrance factors for unhindered α transitions
1980Bo10: Studied effects of nuclear deformation on the electron states and conversion coefficients
1977Ra15: Q values.
1974Ba18, 1973Ra06, 1972El21: μ values
1976Ch22, 1971Ko31: Single-particle level energies
1971Vo13: Penetration matrix element for the 84-keV E1 transition
1970Bo27: The M1 transition probabilities in the ground-state band
Other Experimental studies:
2008PaZR: 242Am(n,f): Preliminary measurement on a 47 μg target using the Los Alamos Science Center, DANCE detector array (Detector for Advanced Neutron Capture Experiments). Fission tagging detector reduces gamma rays associated with the (n,f). (n,γ) data are barely visible over the background after subtracting gamma rays associated with fission
2008BrZW: Cross section obtained for thermal capture and fission cross sections using the post-irradiation mass spectrometry analysis for 242mAm(n,γ) and the fission chamber measurements for 242mAm(n,f). Measurements were performed at the High Flux Reactor of Laue Langevin Institut in Grenoble, France
2003An18: The cross-sections for 242Am(n,γ), E=5-100 keV were analyzed.
2001Fi15,1999Bo08: The cross-section for 242Am(thermal n,γ) was measured. See also 1972Ih01 for measured effective cross-sections.
1997Li27,1996Li22: The hyperfine and nuclear quadrupole interactions were studied by optical spectral hole-burning technique.
1993Oh03: The excitation function and mass yields for proton induced fission with E(p)=10 - 16 MeV incident energy were measured, and asymmetric fission-barrier height was deduced
1986Al04: 243Am(γ,f); E(γ)=11.5 MeV: induced fission yields were measured; neutron and fission widths were deduced
1981Wa05: Delayed neutron yields in 242Am(n,fission) were measured
1981Be15: Neutron-induced fission cross sections relative to 235U were measured with E(n)=0.2 - 30 MeV neutrons.
1978Al33: 243Am(γ,f); E(γ)=100-1000 MeV: cross sections were measured and fissionability deduced
Q-value: S(2n)=11902.5 14; S(2p)=11660 70 (2012Wa38)