240PU 240AM EC DECAY 1972AH07,1971LEZO,1972POZS25NDS 202511
240PU H TYP=FUL$AUT=C. Morse$CIT=NDS 206, 359 (2025)$CUT=27-Sep-2024$
240PU c 1972Ah07: Measured E|g, I|g, ce, (ce)(|g) coin, mass-separated
240PU2c source, Ge(Li) and Si(Li) detectors. Source prepared by
240PU3c {+237}Np(|a,n) reaction at 30 MeV. Subsequent to chemical separation
240PU4c the source was run through the Argonne isotope separator to obtain
240PU5c enriched {+240}Am samples. A total of 14 |g rays were reported: 42.9,
240PU6c 98.9 and 12 |g rays from 888 to 1295 keV. In the level scheme, eight
240PU7c |g rays were assigned amongst five excited states. Conversion
240PU8c electron intensities were given in percent per {+240}Am decay, but no
240PU9c uncertainties were quoted in these intensities and the procedure to
240PUac normalize ce intensities to |g-ray intensities was not explained.
240PU c 1971LeZO: Measured E|g, I|g, |g|g, ce, chemically separated source,
240PU2c Ge(Li) detectors singles and Compton-suppressed, Si(Li) electron
240PU3c spectrometer, (x ray)|g coin using two NaI(Tl) detectors. A total of
240PU4c 31 |g rays and two conversion lines (for 42.9|g and 99.0|g) reported.
240PU5c Full experimental details about normalization of electron spectra and
240PU6c spectral (|g and ce) figures are not available in this report.
240PU c 1972PoZS: Measured E|g, I|g, half-life, chemically separated source
240PU2c prepared by {+237}Np(|a,n) reaction at 50 MeV. Ge(Li) detector used.
240PU3c A total of 23 |g rays reported between 305 and 1296 keV. Small
240PU4c impurities of {+140}La, {+143}Ce and {+239}Am were present in the
240PU5c source. Twenty |g rays were placed in a level scheme essentially
240PU6c based on the one from 1971LeZO. No uncertainties were quoted on
240PU7c |g-ray intensities, except for the ratio I|g(889|g)/I|g(988|g).
240PU c Others: 1957Sm77, 1960Gl01, 1966Bi03
240PU cG $Pu K| x-ray intensities (per 100 decays of {+240}Am) from 1972Ah07:
240PU cG $I(K|a{-2}, 99.53 keV {I2})=18.6 {I6}
240PU cG $I(K|a{-1}, 103.74 keV {I2})=29.0 {I10}
240PU cG $I(K|b{-1}+K|b{-3}, 116.25 keV {I3}+117.23 keV {I3})=10.8 {I4}
240PU cG $I(K|b{-2}+K|b{-4}+K to O{-2,3}, 120.65 keV {I3}+121.56 keV {I3})=
240PU2cG 3.80 {I15}
240PU cG $Experimental conversion coefficients are from ce data of 1972Ah07,
240PU2cG unless otherwise stated.
240PU cG E,RI$Weighted averages of values from 1971LeZO and 1972Ah07 are taken
240PU2cG when possible. Except for the two most intense transitions, values
240PU3cG from 1972PoZS are not considered in deducing recommended values since
240PU4cG the energies seem consistently higher (by up to 1 keV at the highest
240PU5cG energies) and the intensities are given without uncertainties. The
240PU6cG intensities given by 1972PoZS are in general agreement with those
240PU7cG from 1971LeZO.
240PU cG E(X),RI(X)$|g from 1971LeZO only
240PU cG E(Z),RI(Z)$From 1971LeZO. Corresponding value from 1972PoZS is in
240PU2cG general agreement but less precise. This |g ray was not reported by
240PU3cG 1972Ah07.
240PU cG M,MR$From ce data of 1972Ah07 and 1971LeZO
240PU cL E$From least-squares fit to E|g's
240PU cL E(L)$Level from 1971LeZO only
240PU cL J$From Adopted Levels
240PU cL BAND(A)$K|p=0+, g.s. band
240PU cL BAND(B)$K|p=0-, octupole band
240PU cL BAND(C)$K|p=0+ band
240PU cL BAND(D)$K|p=(1-) band
240PU cL BAND(E)$K|p=(3)+ band
240PU cL BAND(F)$K|p=(2+) band
240PU dG $Transition strength is calculated by Java-RULER (version 10-Jun-2025)
240PU DG CC$FROM BrIcc v2.3e (17-Jun-2020) 2008Ki07, "Frozen Orbitals" appr.
240PU DE EAV,LOGFT$FROM BetaShape v2.4 (Jun-2024) 2023MO21.
240AM P 0 (3-) 50.8 H 3 1385 14
240AM cP $Configuration=|n1/2[631]~#|p5/2[523], K|p=3-
240AM cP T$from 1972Ah07. Others: 50 h (1950St61), 53 h (1952Hi63), 51.0 h
240AM2cP {I5} (1960Gl01); 50.9 h {I7} (1966Bi03), 50.7 h {I8} (1972PoZS).
240AM cP QP$From 2021Wa16
240PU N 0.986 15 0.986 15 1 1
240PU cN NR,NT$Determined by assuming that the electron-capture feeding to the
240PU2cN ground state is zero and to the first two excited states is less than
240PU3cN 1% each, such that |SI{-|g+ce}=99 {I1} for all transitions feeding
240PU4cN these states.
240PU cN BR$%|a=1.9|*10{+-4} {I7} as recommended by 1986LoZT; |?1.9|*10{+-4}
240PU2cN (1970Go42); %|b{+-}<6|*10{+-6} (1960Gl01)
240PU PN 4
240PU L 0.0 0+ A
240PU L 42.87 4 2+ A
240PU G 42.87 4 0.111 2 E2 901 13 99.98 1
240PUX G EL2C=366 37$EL3C=333 33$EMC=227 23$%IG=0.1093 23
240PUS G LC=654 10$MC=182.5 27$NC=50.1 7$OC=11.77 17$PC=1.841 27$QC=0.00388 6
240PU cG E$from ce spectrum (1957Sm77). Other: 42.9 {I1} (1972Ah07)
240PU cG TI$100-(summed intensity of |g rays to g.s. from levels above 42.9).
240PU2cG Others: 92 from electron intensities of 1972Ah07 (uncertainties are
240PU3cG not given by 1972Ah07 but expected to about 4% as in some other
240PU4cG papers by the same group, e.g. 1974Po08); 112 {I14} (1971LeZO).
240PU cG RI$from I(|g+ce) and |a. 1972Ah07 give measured intensity of 0.09 {I1}
240PU cG $Ice(L2)=33, Ice(L3)=30, Ice(M)=20.5, Ice(N+)=7.3 (1972Ah07)
240PU cG $(L1+L2)/L3=1.2 {I1}, L/M=3.7 {I3} (1971LeZO).
240PU E 3.229E-5 1 LT9.5 1 LT ?
240PUS E EAV=169 7$CK=0.7554 7$CL=0.17885 36$CM+=0.06572 23
240PU cE TI$based on log| {Ift}=9.1 and 9.9 for two other K-forbidden
240PU2cE (|DK=3,|DJ=1) |b transitions in the level scheme. Others: -8 {I4}
240PU3cE from measured electron and |g-ray intensities in 1972Ah07 (assuming
240PU4cE 4% uncertainty on measured electron intensities); 12 {I14} from
240PU5cE electron and |g-ray intensities of 1971LeZO. As expected both these
240PU6cE are consistent with no |b feeding to the 42.9 level
240PU L 141.80 8 4+ A
240PU G 98.9 1 1.49 4 E2 16.62 25 26.2 6
240PUX G EL1C+EL2C=7.6 8$EL3C=4.8 5$EMC=3.6 4$%IG=1.466 30
240PUS G LC=12.06 18$MC=3.38 5$NC=0.928 14$OC=0.2187 32$PC=0.0348 5$
240PUS G QC=0.0001219 18
240PU cG E$from |g spectrum (1972Ah07). Others: 98.9 {I2} (1957Sm77), 99.0
240PU2cG {I1} (1972Ah07) from ce spectrum
240PU cG TI$from intensity balance at 141.78 level and assuming |b feeding of
240PU2cG 0.5% {I5}. Others: 27.1 from conversion electron intensity data of
240PU3cG 1972Ah07 (uncertainties are not given by 1972Ah07 but expected to
240PU4cG about 4% as in some other papers by the same group, e.g. 1974Po08);
240PU5cG 30 {I3} (1971LeZO).
240PU cG RI$from I(|g+ce) and |a. 1972Ah07 give measured intensity of 1.5 {I2}
240PU cG $Ice(L1+L2)=11.4, Ice(L3)=7.2, Ice(M)=5.4, Ice(N+)=1.97 (1972Ah07)
240PU cG $(L1+L2)/L3=1.67 {I15} (1971LeZO).
240PU E 5.228E-6 1 LT9.4 1 LT ?
240PUS E EAV=121 7$CK=0.7529 8$CL=0.1806 4$CM+=0.06651 24
240PU cE TI$based on log| {Ift}=9.1 and 9.9 for two other K-forbidden
240PU2cE (|DK=3,|DJ=1) |b transitions in the level scheme. Others: 1.4 {I12}
240PU3cE from measured electron and |g-ray intensities in 1972Ah07 (assuming
240PU4cE 4% uncertainty on measured electron intensities); 4 {I3} from
240PU5cE electron and |g-ray intensities of 1971LeZO. As expected, both these
240PU6cE values are consistent with no |b feeding to the 42.9 level
240PU L 294.3 7 6+ A
240PU G 152.4 10 0.012 3 E2 2.50 8
240PUF G FLAG=X
240PUX G EMC=0.47 13 (1971LeZO)$%IG=0.0118 30
240PUS G KC=0.1961 28$LC=1.68 6$MC=0.468 15$NC=0.129 4$OC=0.0304 10$
240PUS G PC=0.00491 16$QC=2.77E-5 7
240PU L 598.0 9 1- B
240PU G 555.4 10 0.01 AP [E1] 0.0117617
240PUF G FLAG=X
240PUX G %IG AP 0.01
240PUS G KC=0.00947 14$LC=0.001729 25$MC=0.000415 6$NC=0.0001123 16$
240PUS G OC=2.77E-5 4$PC=5.11E-6 7$QC=2.99E-7 4
240PU E 0.0067 2411.4 GT 0.0067 24
240PUS E CK=0.6638 34$CL=0.2411 21$CM+=0.0951 9
240PU L 649.4 6 3- B
240PU cL $Configuration=|p5/2[642]~#|p5/2[523], K|p=0-
240PU G 507.9 10 0.072 6 [E1] 0.0139720
240PUF G FLAG=Z
240PUX G %IG=0.071 6
240PUS G KC=0.01122 16$LC=0.002073 30$MC=0.000499 7$NC=0.0001348 20$
240PUS G OC=3.32E-5 5$PC=6.11E-6 9$QC=3.52E-7 5
240PU G 606.7 10 0.070 8 [E1] 0.0099414
240PUF G FLAG=Z
240PUX G %IG=0.069 8
240PUS G KC=0.00802 11$LC=0.001450 21$MC=0.000348 5$NC=9.41E-5 14$
240PUS G OC=2.319E-5 33$PC=4.30E-6 6$QC=2.55E-7 4
240PU E 0.033 1310.42 17 0.033 13
240PUS E CK=0.7271 18$CL=0.1983 10$CM+=0.07459 48
240PU L 742.5 7 5- B
240PUF L FLAG=L
240PU G 447.8 10 0.013 4 [E1] 0.0179126
240PUF G FLAG=X
240PUX G %IG=0.013 4
240PUS G KC=0.01435 21$LC=0.00269 4$MC=0.000649 10$NC=0.0001755 26$
240PUS G OC=4.31E-5 6$PC=7.91E-6 12$QC=4.46E-7 7
240PU G 600.7 10 0.014 6 [E1] 0.0101315
240PUF G FLAG=X
240PUX G %IG=0.014 6
240PUS G KC=0.00817 12$LC=0.001479 21$MC=0.000355 5$NC=9.60E-5 14$
240PUS G OC=2.365E-5 34$PC=4.38E-6 6$QC=2.59E-7 4
240PU L 901.5 9 2+ C
240PUF L FLAG=L
240PU G 251.8 10 0.005 2 [E1] 0.060810
240PUF G FLAG=X
240PUX G %IG=0.0049 20
240PUS G KC=0.0478 8$LC=0.00980 17$MC=0.00238 4$NC=0.000643 11$OC=0.0001566 26$
240PUS G PC=2.80E-5 5$QC=1.402E-6 23
240PU G 303.7 10 0.009 2 [E1] 0.04036
240PUF G FLAG=Z
240PUX G %IG=0.0089 20
240PUS G KC=0.0319 5$LC=0.00633 10$MC=0.001535 24$NC=0.000415 7$
240PUS G OC=0.0001013 16$PC=1.828E-5 29$QC=9.54E-7 15
240PU E 0.014 3 10.35 10 0.014 3
240PUS E CK=0.6876 43$CL=0.2253 27$CM+=0.0870 11
240PU L 958.97 21 (2-) D
240PU G 916.1 2 0.090 6 [E1] 0.004727
240PUX G %IG=0.089 6
240PUS G KC=0.00384 5$LC=0.000666 9$MC=0.0001589 22$NC=4.30E-5 6$
240PUS G OC=1.064E-5 15$PC=1.992E-6 28$QC=1.245E-7 17
240PU E 0.089 6 9.413 49 0.089 6
240PUS E CK=0.670 6$CL=0.2374 38$CM+=0.0928 15
240PU L 992.5 8 4+ C
240PUF L FLAG=L
240PU G 249.7 10 0.020 3 [E1] 0.062010
240PUF G FLAG=X
240PUX G %IG=0.0197 30
240PUS G KC=0.0487 8$LC=0.01000 17$MC=0.00243 4$NC=0.000656 11$OC=0.0001597 27$
240PUS G PC=2.85E-5 5$QC=1.427E-6 23
240PU G 343.7 10 0.049 5 [E1] 0.03095
240PUF G FLAG=Z
240PUX G %IG=0.048 5
240PUS G KC=0.0245 4$LC=0.00479 7$MC=0.001158 18$NC=0.000313 5$OC=7.66E-5 12$
240PUS G PC=1.390E-5 21$QC=7.44E-7 11
240PU E 0.106 119.24 6 0.106 11
240PUS E CK=0.656 7$CL=0.2468 47$CM+=0.0971 18
240PU L 1002.2 3 (3-) D
240PUF L FLAG=L
240PU cL E$level population proposed as a result of revised placement of
240PU2cL 959.3|g according to the level scheme from the decay of 61.9-min
240PU3cL {+240}Np
240PU G 959.3 3 0.039 5 [E1] 0.004356
240PUX G %IG=0.038 5
240PUS G KC=0.00354 5$LC=0.000613 9$MC=0.0001461 20$NC=3.95E-5 6$OC=9.79E-6 14$
240PUS G PC=1.835E-6 26$QC=1.152E-7 16
240PU cG E$placed in consistency with results from 61.9-min {+240}Np decay.
240PU2cG The placement from 959 level proposed by 1971LeZO and 1972PoZS is in
240PU3cG disagreement
240PU E 0.039 5 9.65 7 0.039 5
240PUS E CK=0.651 8$CL=0.250 5$CM+=0.0987 19
240PU L 1030.65 7 (3)+ 1.32 NS 15 E
240PU cL T$from 1976BuZP
240PU cL $Configuration=|n1/2[631]~#|n5/2[622]
240PU G 382.1 10 0.053 5 [E1] 0.02474 ?
240PUF G FLAG=Z
240PUX G %IG=0.052 5
240PUS G KC=0.01972 30$LC=0.00379 6$MC=0.000915 14$NC=0.000247 4$OC=6.06E-5 9$
240PUS G PC=1.105E-5 17$QC=6.04E-7 9
240PUB G BE1W=1.27E-9 +21-17
240PU cG $Placed on the basis of energy fit.
240PU G 888.85 5 25.1 4 E2 0.0154922
240PUX G EKC=0.0112 4 (1971LeZO) $EL3C=0.00025 2$EMC=0.00120 10$%IG=24.7 5
240PUS G KC=0.01127 16$LC=0.00315 4$MC=0.000797 11$NC=0.0002172 30$
240PUS G OC=5.31E-5 7$PC=9.67E-6 14$QC=4.49E-7 6
240PUB G BE2W=0.00220 +28-23
240PU cG M$from K/L3=44 {I5} (1972Ah07), 39 {I20} (1971LeZO) and |a(K)exp
240PU2cG values from 1972Ah07 and 1971LeZO. Others: |d(E2/M1)>5 (1971LeZO),
240PU3cG >4.5 (1972Ah07)
240PU cG $Ice(K)=0.276, Ice(L3)=0.0063, Ice(M)=0.030, Ice(N+)=0.012 (1972Ah07)
240PU cG E$weighted average of 1971LeZO, 1972Ah07 and 1972PoZS
240PU G 987.79 6 73.2 10 E2(+M1) 10 GT 0.0128225
240PUX G EKC=0.0090 7$EL1C+EL2C=0.00220 18$EL3C=0.000120 10$EMC=0.00060 5$
240PUX G %IG=72.2 7
240PUS G KC=0.00952 19$LC=0.00246 4$MC=0.000617 10$NC=0.0001681 28$
240PUS G OC=4.12E-5 7$PC=7.56E-6 13$QC=3.73E-7 8
240PUB G BE2W=0.0037 +6-4
240PU cG M$from (L1+L2)/L3=18.3 {I20} and K/L3=84 {I9} (1972Ah07). Others:
240PU2cG |d(E2/M1)>6 (1971LeZO), >4.5 (1972Ah07)
240PU cG $Ice(K)=0.74, Ice(L1+L2)=0.161, Ice(L3)=0.0088, Ice(M)=0.044,
240PU2cG Ice(N+)=0.019 (1972Ah07)
240PU cG $K/L=3.77 {I11}; L1/L2=1.5 {I+10-5}; (L1+L2)/L3=20 {I2} (1971LeZO)
240PU cG E$weighted average of 1971LeZO, 1972Ah07 and 1972PoZS
240PU E 98.2 196.16 5 98.2 19
240PUS E CK=0.636 10$CL=0.260 6$CM+=0.1038 24
240PU cE $|e(K)/|e=0.588 {I15} (1971LeZO) from (K-x ray)/|g ray intensities.
240PU L 1076.4 3 (4+) E
240PU G 934.6 5 0.025 3 [M1,E2] 0.035 21
240PUF G FLAG=Z
240PUX G %IG=0.0247 30
240PUS G KC=0.027 17$LC=0.0056 29$MC=0.0014 7$NC=3.8E-4 18$OC=9.E-5 5$
240PUS G PC=1.8E-5 9$QC=1.1E-6 7
240PU G 1033.5 3 0.010 1 [E2] 0.0116116
240PUX G %IG=0.0099 10
240PUS G KC=0.00868 12$LC=0.002189 31$MC=0.000548 8$NC=0.0001492 21$
240PUS G OC=3.66E-5 5$PC=6.73E-6 9$QC=3.38E-7 5
240PU E 0.035 4 9.44 8 0.035 4
240PUS E CK=0.602 14$CL=0.284 9$CM+=0.1148 35
240PU L 1137.5 3 (2+) F
240PU G 1094.7 3 0.016 1 [M1,E2] 0.023 13
240PUX G %IG=0.0158 10
240PUS G KC=0.018 11$LC=0.0037 18$MC=9.E-4 4$NC=2.5E-4 12$OC=6.2E-5 30$
240PUS G PC=1.2E-5 6$QC=7.E-7 4
240PU G 1137.4 5 0.0073 20 [E2] 0.0096914
240PUF G FLAG=Z
240PUX G %IG=0.0072 20
240PUS G KC=0.00735 10$LC=0.001755 25$MC=0.000437 6$NC=0.0001188 17$
240PUS G OC=2.92E-5 4$PC=5.39E-6 8$QC=2.83E-7 4
240PU E 0.0234 239.33 9 0.0234 23
240PUS E CK=0.524 28$CL=0.336 18$CM+=0.141 7
240PU L 1177.93 22 (3+) F
240PU G 1036.1 3 0.016 2 [M1,E2] 0.027 15
240PUX G %IG=0.0158 20
240PUS G KC=0.021 12$LC=0.0043 21$MC=0.0011 5$NC=2.9E-4 14$OC=7.1E-5 35$
240PUS G PC=1.3E-5 7$QC=8.E-7 5
240PU G 1135.1 3 0.049 3 [M1,E2] 0.021 12
240PUX G %IG=0.0483 30
240PUS G KC=0.017 9$LC=0.0034 16$MC=8.E-4 4$NC=2.3E-4 11$OC=5.6E-5 27$
240PUS G PC=1.1E-5 5$QC=7.E-7 4
240PU E 0.066 4 8.64 11 0.066 4
240PUS E CK=0.428 49$CL=0.399 32$CM+=0.172 13
240PU L 1223.09 22 (2+)
240PU G 1180.3 3 0.0102 8 [M1,E2] 0.019 10
240PUX G %IG=0.0101 8
240PUS G KC=0.015 8$LC=0.0031 15$MC=7.5E-4 35$NC=2.0E-4 10$OC=5.1E-5 24$
240PUS G PC=1.0E-5 5$QC=6.0E-7 33
240PU G 1223.0 3 0.007 1 [E2] 0.0084712
240PUF G FLAG=Z
240PUX G %IG=0.0069 10
240PUS G KC=0.00648 9$LC=0.001491 21$MC=0.000369 5$NC=0.0001005 14$
240PUS G OC=2.473E-5 35$PC=4.58E-6 6$QC=2.471E-7 35
240PU E 0.0172 138.85 15 0.0172 13
240PUS E CK=0.23 9$CL=0.53 6$CM+=0.243 25
240PU L 1232.1 7 (4+) F
240PU G 938.0 6 0.007 3 [E2] 0.0139620
240PUF G FLAG=Z
240PUX G %IG=0.0069 30
240PUS G KC=0.01026 14$LC=0.00276 4$MC=0.000695 10$NC=0.0001894 27$
240PUS G OC=4.64E-5 7$PC=8.48E-6 12$QC=4.05E-7 6
240PU G 1089.8 10 0.0031 6 [M1,E2] 0.024 13
240PUF G FLAG=Z
240PUX G %IG=0.0031 6
240PUS G KC=0.019 11$LC=0.0038 19$MC=9.E-4 4$NC=2.5E-4 12$OC=6.2E-5 30$
240PUS G PC=1.2E-5 6$QC=7.E-7 4
240PU G 1190.0 10 0.0005 3 [E2] 0.0089113 ?
240PUX G %IG=0.00049 30
240PUS G KC=0.00679 10$LC=0.001585 22$MC=0.000393 6$NC=0.0001070 15$
240PUS G OC=2.63E-5 4$PC=4.87E-6 7$QC=2.60E-7 4
240PU E 0.010 3 9.00 21 0.010 3
240PUS E CK=0.17 9$CL=0.57 6$CM+=0.265 26
240PU L 1262.15 25 (3+)
240PU G 1120.3 4 0.011 1 [M1,E2] 0.022 12
240PUX G %IG=0.01085 99
240PUS G KC=0.017 10$LC=0.0035 17$MC=9.E-4 4$NC=2.3E-4 11$OC=5.8E-5 28$
240PUS G PC=1.1E-5 5$QC=7.E-7 4
240PU G 1219.3 3 0.035 2 [M1,E2] 0.018 9
240PUX G %IG=0.0345 20
240PUS G KC=0.014 8$LC=0.0028 13$MC=6.9E-4 32$NC=1.9E-4 9$OC=4.7E-5 22$
240PUS G PC=9.E-6 4$QC=5.5E-7 30
240PU E 0.0462 248.04 16 0.0462 24
240PUS E CL=0.7 19
240PU L 1337.08 25 (2+,3,4+) ?
240PU G 1195.5 4 0.0026 5 ?
240PUF G FLAG=Z
240PUX G %IG=0.0026 5
240PU G 1294.1 3 0.009 1 ?
240PUX G %IG=0.0089 10