241PU 241NP B- DECAY 1981PA20 15NDS 201512
241PU H TYP=FUL$AUT=C.D. NESARAJA$CIT=NDS 130, 183 (2015)$CUT=30-Sep-2015$
241PU c 1981Pa20: {+241}Np produced via {+238}U(|a,p) with E|a=32 MeV and
241PU2c {+244}Pu(n,p3n) with En=30-160 MeV at the Brookhaven MEIN facility.
241PU3c Irradiation were followed by chemical separation. Decay of
241PU4c {+241}Np was studied by |g spectroscopy using a high resolution
241PU5c Ge(Li) detector and by |b emission by a 4|p proportional counter.
241PU6c Measured E|g, absolute I|g, and T{-1/2}.
241PU c 1966Qa02: {+241}Np produced via {+238}U(|a,p) at Nuffield Cyclotron at
241PU2c Birmingham University with E|a= 40 MeV. Irradiation was followed by
241PU3c chemical separation. A Geiger counter, anthrracene crystal
241PU4c scintillation |b spectrometer, Xe proportional counter, NaI(Tl)
241PU5c detector, and a ZnS-Ag scintillation |a counter were used to measure
241PU6c |g and |b radiations. The half life from decay curves for {+241}Np
241PU7c was 16.0 min {I2} with an end-point energy of 1.25 MeV. The 3.4 hour
241PU8c activity was not detected.
241PU c 1959Va32: {+241}Np produced via {+238}U(|a,p) at Argonne cyclotron
241PU2c followed by chemical separation and measured with a 2|p and end window
241PU3c proportional counters. |b and |g spectrum were measured with the
241PU4c anthracene crystal and a NaI(Tl) detectors. The beta spectrum end
241PU5c point energy of the 16 minute component was 1.36 MeV {I10} with
241PU6c log{Ift} of 5.8.
241PU cB IB$From an intensity balance at each level
241PU cG E$From 1981Pa20. Others: 1966Qa02
241PU cG M,MR$From (n,|g) as given in adopted |g's
241PU cG RI(A)$From an intensity balance at the 96 level and
241PU2cG I|g(96|g)/I|g(54|g)=0.15 {I3} from (n,|g)
241PU cG E(B)$Rounded-off value from adopted |g's. Not seen in |b decay
241PU cG E(C),RI(C)$The authors report E|g=518.8 {I1} with I|g=0.44 {I3} for a
241PU2cG transition doubly placed from the 519 and 561 levels. From
241PU3cG I|g/I|g(477|g)=3.09 {I16} for the 519 level, and I|g/I|g(561|g)=1.45
241PU4cG {I13} for the 561 level, both from (n,|g), one gets I|g=0.31 {I3} and
241PU5cG 0.12 {I4} for these two placements, in agreement with the measured
241PU6cG value for the doublet. The energies are rounded-off values from (n,|g)
241PU DG CC$FROM BrIcc v2.3a (30-Jun-2013) 2008Ki07, "Frozen Orbitals" appr.
241PU CG MR$IF NO VALUE GIVEN IT WAS ASSUMED MR=1.00 FOR E2/M1,
241PU2CG MR=1.00 FOR E3/M2 AND MR=0.10 FOR THE OTHER MULTIPOLARITIES
241PU cL E$Rounded-off values from adopted levels, except for the 930
241PU2cL level, whose de excitation transition is seen only in |b decay
241PU cL J$From Adopted Levels
241NP P 0.0 5/2+ 13.9 M 2 1.30E+3 7
241NP cP J$From Adopted Levels in {+241}Np
241NP cP T$From least squares decay analyses of the 175 keV |g.
241NP cP QP$From 2012Wa38
241PU N 1.0 1.0 1.0 1.0
241PU PN 1.0 1.0 1.0 2
241PU cN NR$I|g(133|g)=0.86 {I5} per 100 disintegrations (4|p proportional
241PU2cN counter 1981Pa20)
241PU L 0.0 5/2+
241PU B 1.30E+3 7 70 4 5.87 9
241PUS B EAV=432 27
241PU cB E$From adopted Q(|b{+-}). Measured values are 1360 {I100} (1959Va32)
241PU2cB and 1250 (1966Qa02)
241PU L 41.97 7/2+
241PU B
241PU cB IB$The intensity balance gives I|b=-2 {I4}
241PU G 42.0 1 0.10 3M1+E2 0.186 4 102.2 22
241PUS G LC=76.0 16$MC=19.4 5
241PUS G NC=5.29 12$OC=1.29 3$PC=0.231 5$QC=0.01087 17
241PU L 95.78 9/2+
241PU G 53.81 0.020 6 M1+E2 0.201 8 44.7 11 S
241PU2 G FLAG=AB$
241PUS G LC=33.3 8$MC=8.42 21
241PUS G NC=2.30 6$OC=0.563 14$PC=0.1021 22$QC=0.00519 8
241PU G 95.79 0.003 1 E2 19.3 S
241PU2 G FLAG=AB$
241PUS G LC=14.00 20$MC=3.92 6
241PUS G NC=1.077 15$OC=0.254 4$PC=0.0404 6$QC=0.0001375 20
241PU L 161.69 1/2+
241PU cL E$The feeding of this level has not been established. It cannot
241PU2cL be directly fed by a |b branch, and no transitions feeding the
241PU3cL level have been observed
241PU G 161.6 2 0.07 1E2 1.97
241PUS G KC=0.190 3$LC=1.292 20$MC=0.360 6
241PUS G NC=0.0991 15$OC=0.0234 4$PC=0.00379 6$QC=2.32E-5 4
241PU L 175.05 7/2+
241PU B 30.8 15 6.00 10
241PUS B EAV=366 27
241PU G 79.26 0.040 4M1+E2 0.65 +25-2222 6 S
241PU2 G FLAG=B$
241PUS G LC=16 4$MC=4.3 12
241PUS G NC=1.2 4$OC=0.28 8$PC=0.047 11$QC=0.00129 22
241PU cG RI$From I|g/I|g(133|g+175|g)=0.010 {I1} in |a decay
241PU G 133.1 1 0.86 5M1+E2 0.222 9 11.35 17
241PUS G KC=8.79 13$LC=1.92 3$MC=0.472 7
241PUS G NC=0.1287 19$OC=0.0319 5$PC=0.00599 9$QC=0.000366 6
241PU G 175.1 1 3.1 2M1+E2 0.217 19 5.20
241PUS G KC=4.07 7$LC=0.854 12$MC=0.209 3
241PUS G NC=0.0569 8$OC=0.01413 20$PC=0.00267 4$QC=0.000167 3
241PU L 404.45 (9/2)-
241PU cL J$See comment on J|p(404 level) in adopted levels
241PU B 0.27 3 7
241PUS B EAV=282 26
241PU G 308.8 2 0.07 2E1 0.0388
241PUS G KC=0.0307 5$LC=0.00610 9$MC=0.001477 21
241PUS G NC=0.000399 6$OC=9.75E-5 14$PC=1.761E-5 25$QC=9.22E-7 13
241PU G 362.4 1 0.19 2E1 0.0276
241PUS G KC=0.0220 3$LC=0.00425 6$MC=0.001028 15
241PUS G NC=0.000278 4$OC=6.81E-5 10$PC=1.238E-5 18$QC=6.70E-7 10
241PU G 405 AP ?
241PU cG E$Only a slight indication for its existence was found in the
241PU2cG |g spectrum. One expects E|g=404.453. This transition is not
241PU3cG seen in (n,|g). If one assumes that I|g is smaller than that for the
241PU3cG adjacent 404.707 and 405.90 |g's in (n,|g), one can estimate I|g<0.01
241PU L 518.81 5/2-
241PU B 0.42 4 7.32 15
241PUS B EAV=241 25
241PU G 476.6 2 0.10 1E1+M2 0.104 +20-250.025 4
241PUS G KC=0.020 3$LC=0.0042 8$MC=0.00104 20
241PUS G NC=0.00028 6$OC=7.0E-5 14$PC=1.3E-5 3$QC=7.7E-7 16
241PU G 518.81 0.31 3E1 0.01340
241PU2 G FLAG=C$
241PUS G KC=0.01078 15$LC=0.00198 3$MC=0.000477 7
241PUS G NC=0.0001290 18$OC=3.17E-5 5$PC=5.86E-6 9$QC=3.38E-7 5
241PU L 561.42 7/2-
241PU B 0.28 6 7.41 18
241PUS B EAV=226 25
241PU G 465.65 0.064 17E1+M2 0.088 +21-280.024 4 S
241PU2 G FLAG=B$
241PUS G KC=0.019 3$LC=0.0039 8$MC=0.00097 20
241PUS G NC=0.00026 6$OC=6.5E-5 14$PC=1.2E-5 3$QC=7.1E-7 16
241PU cG RI$From I|g/I|g(519|g+562|g)=0.321 {I20} in (n,|g)
241PU G 519.43 0.12 4E1+M2 0.24 +9-11 0.05 3
241PU2 G FLAG=C$
241PUS G KC=0.038 22$LC=0.009 6$MC=0.0023 15
241PUS G NC=0.0006 4$OC=0.00016 10$PC=2.9E-5 19$QC=1.8E-6 12
241PU G 561.1 2 0.08 3(E1+M2) 0.27 4 0.048 11
241PUS G KC=0.036 8$LC=0.0087 21$MC=0.0022 6
241PUS G NC=0.00059 14$OC=0.00015 4$PC=2.8E-5 7$QC=1.7E-6 4
241PU L 834.84 3/2+,5/2+,7/2+
241PU B 0.12 AP 7.1 AP
241PUS B EAV=135 23
241PU G 834.6 2 0.11 3M1+E2 0.94 +25-200.048 7
241PUS G KC=0.037 6$LC=0.0079 10$MC=0.00192 22
241PUS G NC=0.00052 6$OC=0.000130 15$PC=2.4E-5 3$QC=1.49E-6 22
241PU L 929.7 2 3/2,5/2,7/2
241PU B 0.080 20 7.0 4
241PUS B EAV=105 22
241PU G 929.7 2 0.08 2