244CM 244AM B- DECAY (26 M) 1984HO02 17NDS 201711
244CM H TYP=FUL$AUT=C.D. Nesaraja$CIT=NDS 146, 387 (2017)$CUT=31-Aug-2017$
244CM c 1984Ho02: {+244}Am was produced by neutron irradiation on {+243}Am
244CM2c High Flux Reactor of the Institut Laue-Langevin at Grenoble. |g ray
244CM3c energies and intensities were measured with two curved-crystal
244CM4c spectrometers. Conversion electron data were measured with the beta
244CM5c spectrometer
244CM c 1962Va08: {+244}Am was produced by neutron irradiation on enriched
244CM2c {+243}Am at the Argonne Reactor CP-5. The decay of the chemically
244CM3c purified {+244}Am was measured by |g singles and |g|g and X-ray
244CM4c coincidence methods using the Tl activated NaI detector. |g|b
244CM5c coincidence were observed using scintillation counting techniques
244CM6c The conversion electron data were measured with a propane flow-type
244CM7c proportional counter with two different types of end windows
244CM DG CC$FROM BrIcc v2.3b (16-Dec-2014) 2008Ki07, "Frozen Orbitals" appr.
244AM P 89.5 16 1+ 26 M 1427.3 10
244CM N 1.05 151.05 150.99963613 1.0
244CM PN 1.05 15 3
244CM cN NR$Obtained by assuming that the yield for 26-min {+244}Am
244CM2cN production in {+243}Am(n,|g) was 95% {I14}. See footnote for I|g.
244CM cG E$Measurements of 1984Ho02. Other measurements: 1962Va08
244CM cG RI$Photon intensity, measured by 1984Ho02; they are given as
244CM2cG per 100 n captures in {+243}Am(n,|g). As pointed out by 1984Ho02,
244CM3cG absolute intensities can be obtained from isomeric cross section ratio:
244CM4cG |s({+243}Am(n,|g){+244}Am (26 min))/|s({+243}Am(n,|g){+244}Am
244CM5cG (10.1 h))=18.6 {I19}, reported by 1964Va04. The amount of 26-min
244CM6cG isomeric state, therefore, was 95% {I14} of the total {+244}Am
244CM7cG production. Multiplying the photon intensities given here by
244CM8cG a factor of 1.05 {I15} (i.e. 1/0.95 {I14}) will convert them
244CM9cG to per 100 {+244}Am (26-min) decays.
244CM cG M$From conversion electron measurements in 1984Ho02.
244CM cB IB$Beta intensity per 100 beta decays of 26-min {+244}Am,
244CM2cB deduced from intensity balance at each level; the normalization
244CM3cB factor to convert I{-|g}'s from per 100 neutron captures to per
244CM4cB 100 beta decays is taken as 1.05 {I15}. Therefore, any change in
244CM5cB |g normalization factor will effectively change the |b intensities
244CM6cB listed here.
244CM cL E,J$From Adopted Levels
244CM L 0.0 0+
244CM B 72 AP 6.4 AP
244CMS B EAV=512.48 73
244CM cB E$1498 keV {I10} measured by 1962Va08.
244CM L 42.957 9 2+
244CM B 25 AP 6.8 AP
244CMS B EAV=495.95 73
244CM G 42.965 100.024 APE2 1050 25 AP
244CMS G LC=760 11$MC=214 3
244CMS G NC=59.5 9$OC=14.38 21$PC=2.35 4$QC=0.00578 9
244CM cG RI$I|g=0.029 listed in 1984Ho02 was calculated from the experimental
244CM2cG electron intensities (which include beta decay activities
244CM3cG from the 10-hour {+244}Am) and theoretical conversion coefficients,
244CM4cG The evaluator has deduced the I|g from intensity balance:
244CM5cG I(42.965|g from the 10.1-hour decay)|? 0.0048. Hence I(42.965|g from
244CM6cG 26-min {+244}Am)|? 0.024
244CM cG M$see 10.1-h {+244}Am |b decay for ce measurements of 1984Ho02.
244CM L 984.914 15 0+
244CM B 1.5 3 6.53 9
244CMS B EAV=155.88 62
244CM G 941.949 18 0.33 11[E2] 0.01547 0.34 11
244CMS G KC=0.01120 16$LC=0.00318 5$MC=0.000807 12
244CMS G NC=0.000222 4$OC=5.57E-5 8$PC=1.053E-5 15$QC=5.41E-7 8
244CM G 984.919 20 E0 1.07 9
244CM cG M$Only conversion electrons were observed by 1984Ho02.
244CM cG $Ice(K)=0.84 {I9}, Ice(L1)=0.17 {I2}, Ice(M1)=0.047 {I7},
244CM2cG Ice(N1)=0.012 {I6}. Ice(total) deduced by evaluator= 1.07 {I9}
244CM3cG Intensities in units of electrons per 100 neutron captures
244CM4cG in {+243}Am(n,|g) (1984Ho02).
244CM L 1020.756 22 (2+) ?
244CM cL E$This level is tentatively assigned. An alternate placement
244CM2cL of the 977.796-keV transition could be to de excite a 977.796-keV
244CM3cL 0+ level to the ground state (1984Ho02).
244CM B 0.17 AP 7.4 AP ?
244CMS B EAV=144.20 62
244CM G 977.796 20 E0(+M1+E2) 0.16 AP
244CM cG M$Only conversion electrons were observed by 1984Ho02.
244CM2cG The 977.92 {I7} gamma observed by 1984Vo07 in
244CM3cG {+243}Am(n,|g), could belong to the beta decay of the 26-min isomer.
244CM4cG In that case, I|g(977.9|g)/I|g(1084.18|g)=0.23 {I10}, measured in
244CM5cG {+243}Am(n,|g) (1984Vo07), gives I|g(977.9|g)=0.08 {I4}.
244CM cG $Ice(K)=0.060 {I6}, Ice(L1)=0.017 {I3}.
244CM2cG Ice(total) assumed by evaluator:
244CM3cG I(total ce)|?Ice(K)+1.30Ice(L1)=0.082; if I|g=0.08, then
244CM4cG I(|g+ce)|?0.16
244CM5cG Intensities in units of electrons per 100 neutron captures
244CM6cG in {+243}Am(n,|g).
244CM L 1084.199 12 (1,2+) ?
244CM B 0.56 16 6.67 13 ?
244CMS B EAV=123.88 60
244CM G 1041.278 22 0.18 6 0.18 6
244CM G 1084.181 14 0.34 11(M1) 0.0440 0.35 11
244CMS G KC=0.0348 5$LC=0.00690 10$MC=0.001680 24
244CMS G NC=0.000461 7$OC=0.0001174 17$PC=2.31E-5 4$QC=1.653E-6 24
244CM cG M$The experimental K-conversion coefficient suggests M1 or M1+E2.
244CM3cG |a(K)exp=0.03 {I1} (higher multipolarities are excluded because
244CM4cG of beta feeding from the 1+ parent.) Since a |g transition to the
244CM5cG 0+ g.s. cannot have M1, E2 admixture, E2 character can also be ruled
244CM6cG out from |a(K)exp if the authors' normalization for
244CM7cG conversion electrons is precise.
244CM L 1105.909 20(1,2) ?
244CM B 0.36 AP 6.8 AP ?
244CMS B EAV=117.03 60
244CM G 1062.953 18 0.26 8 0.29 AP
244CM cG M$Experimental conversion coefficients do not rule out
244CM2cG M2 and M3 multipolarities:
244CM3cG |a(K)exp=0.09 {I3}, |a(L1)exp=0.02 {I1}. The
244CM4cG M3 character can be ruled out based on the decay scheme. As
244CM6cG the authors (1984Ho02) point out, the 1062- and 1105-keV gammas
244CM7cG might be strongly hindered; conversion coefficients for anomalous E1
244CM8cG transitions could exceed the theoretical coefficients by a factor
244CM9cG as large as 100. No multipolarity for the 1062.953|g is adopted.
244CM cG TI$Deduced by evaluator with |a|? 0.114 assumed from experimental conve
244CM2cG coefficients: |a(K)+1.20|a(L1)
244CM G 1105.43 19 0.04 2 0.05 AP
244CM cG M$|a(K)exp=0.14 {I11} suggests either
244CM2cG M1, M2 or M3 multipolarity. By assuming that the decay scheme
244CM3cG is correct, the M3 character can be ruled out. See the comment for
244CM4cG the 1062.953|g for the possibility of an anomalous E1 transition.
244CM cG TI$Deduced by evaluator with |a|? 0.17 assumed from experimental conver
244CM2cG coefficients: |a(K)+0.20|a(K)