154EU 154EU IT DECAY (46.3 M) 1975CA22,1976CH08,1976ZO0125NDS 202503
154EU H TYP=FUL$AUT=N. NICA$CIT=NDS 200, 2 (2025)$CUT=22-Aug-2022$
154EU D DATA SET UPDATED (JANUARY, 2008) TO INCLUDE BRICC AND MODIFY SOME
154EU2D COMMENTS
154EU c Experimental methods:
154EU c 1975Ca22: Produced by (p,n) on enriched (99.996%) {+154}Sm with
154EU2c E(p)=11 MeV. Measured |g singles and |g|g coincidences with
154EU3c Ge detectors.
154EU c 1976Ch08: Produced by (p,n) on enriched (99.996%) {+154}Sm with
154EU2c E(p)=12.5 MeV followed by chemical separation. Measured |g's
154EU3c with Ge detectors and ce in magnetic spectrometer.
154EU c 1976Zo01: Produced by (p,n), (d,2n), (d,|a), and (d,p); some
154EU2c followed by chemical separations. Measured |g singles and |g|g
154EU3c coincidences with Ge detectors. Si(Li) detector used in search
154EU4c for the isomeric transition.
154EU cG The |g transition which deexcites the isomeric level has
154EU2cG not been observed; and two other unobserved |g transitions are
154EU3cG proposed to provide feeding of the 127 and 129 levels.
154EU cG E From 1976Zo01. These values have the smallest
154EU2cG uncertainties, so a weighted average of these values with those
154EU3cG of 1975Ca22 and 1976Ch08 would give essentially the same values.
154EU4cG For most |g's, more precise energies are given in the Adopted
154EU5cG |g Radiations.
154EU cG RI From 1976Ch08, unless otherwise noted. The evaluator has
154EU2cG increased the uncertainties by factors of 2.0 above 30 keV and
154EU3cG 4.0 below 30 keV to allow for the large discrepancy between
154EU4cG the values from 1975Ca22, 1976Ch08, and 1976Zo01. The
154EU5cG discrepancies among the reported data are illustrated by the
154EU6cG fact that, for the three |g's below 34 keV, the reported
154EU7cG uncertainties are about 10%, but the values vary by factors
154EU8cG of 2 or more.
154EU cG M,MR Assignments and values are from Adopted |g Radiations.
154EU cL Although the observed |g rays are similar, the decay
154EU2cL schemes of 1975Ca22, 1976Ch08, and 1976Zo01 are quite different.
154EU3cL The scheme adopted here is that of the evaluator and is based
154EU4cL on the level structure from the {+153}Eu(n,|g) study of 1987Ba52.
154EU5cL The scheme adopted in previous ENSDF evaluations
154EU6cL (1979Ha02 and 1987He20) was similar to that of 1976Zo01, which
154EU7cL relied on certain data from the (n,|g) study of 1977St14. This
154EU8cL study differs in important ways from that of 1987Ba52.
154EU cL E Computed from these |g energies, unless otherwise noted;
154EU2cL for more precise values, see the Adopted Levels.
154EU cL J From {+154}Eu Adopted Levels, where the band assignments
154EU2cL are also discussed.
154EU cL T$Adopted values. In comments: from {+154}Eu
154EU2cL (46.0 min) decay only
154EU DG CC$FROM BrIcc v2.3e (17-Jun-2020) 2008Ki07, "Frozen Orbitals" appr.
154EU P 145.3 3 8- 46.3 M 4
154EU N 0.369 9 0.369 9 1.0
154EU cN NR$Normalized to give 100% feeding of ground state by 68.17|g and
154EU2cN 100.88|g
154EU PN 3
154EU L 0.0 3- 8.592 Y 5
154EU L 68.17 1 2+ 2.2 US 1
154EU cL T$4.1 |ms {I4} (1975Ca22).
154EU G 68.17 1 100 E1 0.793 11 C
154EUS G KC=0.660 9$LC=0.1046 15$MC=0.02256 32
154EUS G NC=0.00505 7$OC=0.000742 10$PC=5.22E-5 7
154EU L 99.950 15 3+ 2 NS LT
154EU G 31.78 1 15 3 M1+E2 0.030 3 8.43 13 C
154EUS G LC=6.61 10$MC=1.433 23
154EUS G NC=0.327 5$OC=0.0515 8$PC=0.00491 7
154EU L 100.88 1 4+ 54 NS 3
154EU cL T$50 ns {I10} (1975Ca22).
154EU G 0.91 [M1,E2] 114 28 S
154EU cG E Existence of transition proposed by 1987Ba52.
154EU cG TI Deduced by evaluator from intensity balances at 99 and 100
154EU2cG levels; 1987Ba52 suggest I|g(1+|a) |? 80.
154EU G 32.61 0.22 3 E2 269 4
154EUS G LC=208.2 29$MC=48.7 7
154EUS G NC=10.73 15$OC=1.418 20$PC=0.000822 12
154EU cG RI Deduced from I|g(32.6)/I|g(100.8) in (n,|g) (1987Ba52).
154EU2cG This value gives I|g(1+|a)=59, compared to I|g(1+|a) |? 36
154EU3cG from Ice data of (1976Ch08).
154EU G 100.88 1 72 5 E1 0.277 4 C
154EUS G KC=0.2331 33$LC=0.0347 5$MC=0.00747 10
154EUS G NC=0.001680 24$OC=0.0002524 35$PC=1.948E-5 27
154EU cG RI Average of three reported values.
154EU L 127.46 6 4+ 10 NS LT
154EU G 27.51 5 2.4 8 M1+E2 0.032 9 13.1 4
154EUS G LC=10.30 35$MC=2.24 8
154EUS G NC=0.511 18$OC=0.0801 24$PC=0.00752 11
154EU L 129.660 23 4- 2 NS LT
154EU G 28.78 2 2.9 12E1 1.502 21 C
154EUS G LC=1.180 17$MC=0.257 4
154EUS G NC=0.0563 8$OC=0.00762 11$PC=0.000404 6
154EU L 136.8 3 5+
154EU G 7.1 [E1] 7 3 S
154EU cG TI Chosen to give intensity balance at 129 level.
154EU G 9.3 [M1,E2] 7E+4 7 35 12 S
154EUS G L/T=0.8 5$M/T=0.18 23
154EUS G N/T=0.04 5$O/T=0.005 7$P/T=4.E-6 5
154EUS G LC=6E+4 5$MC=1.3E+4 13
154EUS G NC=2.8E+3 28$OC=4E+2 4$PC=0.32 13
154EU cG TI Chosen to give intensity balance at 127 level.
154EU G 35.802 34 8 M1+E2 0.09 2 7.1 6
154EUS G LC=5.5 5$MC=1.21 12
154EUS G NC=0.275 26$OC=0.0421 34$PC=0.00343 5
154EU L 145.3 3 8- 46.3 M 4 M
154EU cL T$48.2 m {I17} (1975Ca22), 45.8 m {I3}
154EU2cL (1976Ch08), 46.8 m {I6} (1976Zo01)
154EU G 8.6 [E3] 320 70 S
154EU cG E From level energies observed in {+153}Eu(d,p) (1987Ba52).
154EU2cG From the inability to observe L-subshell conversion lines in
154EU3cG this isomer decay, 1976Ch08 deduce E|g < 13 keV.
154EU cG CC If mult=E3, |a(8.6 keV)>5.6x10{+7}, but the E{-|g} value
154EU2cG lies within 1 keV of 2 of the L-shell binding energies. Also, there is
154EU3cG a large energy dependence in the theoretical |a values in this
154EU4cG energy region. Thus, the evaluator regards the |a value for this
154EU5cG transition as highly uncertain.
154EU cG TI Chosen to give intensity balance.