156EU 156SM B- DECAY 1966HA26,1968AN09 12NDS 201210
156EU H TYP=FUL$AUT=C. W. REICH$CIT=NDS 113, 2537 (2012)$CUT=1-Mar-2012$
156EU D DATA SET UPDATED (AUGUST, 2011) BY CW REICH TO GIVE NEW QP AND CC
156EU2D VALUES.
156EU D DATA SET UPDATED (FEB.,2001) BY CW REICH. REVISED Q-VALUE, NEW
156EU2D COMMENTS WERE INCLUDED, EXISTING COMMENTS WERE REARRANGED AND
156EU3D REWORDED, TYPOS AND AN INCORRECT Keyno WERE CORRECTED. A NEW LEVEL WAS
156EU4D ADDED, INCORPORATING A PREVIOUSLY UNPLACED G.
156EU c {+156}Sm has been produced as a product of n-induced fission of
156EU2c {+235}U, U and {+239}Pu, |a-induced fission of {+238}U and the (d,|a)
156EU3c reaction on {+158}Gd.
156EU c The decay-scheme data are primarily those of 1966Ha26. The
156EU2c excited-state half-lives are those reported by 1968An09. Others:
156EU3c 1963Gu04; 1969Gr32.
156EU c Experimental methods:
156EU c 1966Ha26: {+156}Sm from n-induced fission of {+239}Pu, followed by
156EU2c chemical separation. |g's measured using proportional counters, Ge and
156EU3c NaI(Tl) detectors. ce and |b{+-} measured in a 6-gap orange-type
156EU4c magnetic spectrometer. |b{+-} also measured in an anthracene crystal.
156EU5c measured E|g,I|g,|g|g,ce,ce|g,|b|g and ce|b. Deduced ce(K),
156EU6c multipolarities for several transitions.
156EU c 1968An09: {+156}Sm from U fission products, followed by chemical
156EU2c separation. Measured level half-lives using plastic and NaI(Tl)
156EU3c detectors.
156EU c The 0+ g.s. of {+156}Eu and the nature of the 0+|)0+ |b{+-} transitions
156EU2c connecting the {+156}Eu g.s. with the ground states of {+156}Sm and
156EU3c {+156}Gd have been discussed by 1965Wi08.
156EU D 1963Gu04: 156SM from n-induced fission of natural U with chemical
156EU2D separation. NaI detectors for G singles and GG and GG(THETA)
156EU3D coincidences; plastic scintillators for B singles and BG
156EU4D coincidences.
156EU D 1965CaZZ: Measured 156EU half-life.
156EU D 1965Wi08: See 1966Ha26 for same data in more complete form.
156EU D 1966Da19: Measured 156EU half-life. 156EU from 235U(N,F), 238U(A,F),
156EU2D and 158GD(D,A) reactions with chemical separation. Proportional
156EU3D counters.
156EU D 1969Gr32: 156SM from fission of U with chemical and isotopic separation
156EU2D G measured with Ge detectors.
156EU D 1971Ba28: Measured 156EU half-life. 156EU from 238U(P,F) with chemical
156EU2D separation. Proportional counter.
156EU D 1972Em01: Measured 156EU half-life. 156EU from 155EU(N,G). Well-type
156EU2D scintillation detector.
156EU D 1981Ch07: From G(THETA) in B- decay of oriented 156EU nuclei, deduce
156EU2D ground-state spin to be 1.
156EU D 1981Ek03: Measured 156EU ground-state spin by atomic-beam, magnetic
156EU2D resonance.
156EU cB E(|b{+-}) are from 1966Ha26. Other: 1963Gu04.
156EU cB $I(|b{+-}) are from |g intensity balances, with I|b{+-}(125) set to 0;
156EU2cB 1966Ha26 give similar values. Calculation gives 6% {I2} feeding to the
156EU3cB 125 level, but, for 0+ to 2-, one expects (1973Ra10) log| {If{+1}t}
156EU4cB |>8.5 or I|b{+-}|<0.1%.
156EU cG Coincidence results are shown in the drawing (1966Ha26).
156EU cG E From 1966Ha26 and based on |g and ce data. Others: 1963Gr04,
156EU2cG 1965Wi08 (same authors as 1966Ha26), and 1969Gr32. For more precise
156EU3cG values, see the {+153}Eu(3n,|g) data.
156EU cG RI From 1966Ha26, from evaluator's combination of results from
156EU2cG Ge and NaI detectors and proportional counters. Others: 1963Gu04,
156EU3cG 1969Gr32.
156EU cG RI$I(K| x ray)=10~{I3} (1966Ha26).
156EU cG M From {+156}Eu Adopted |g radiations and based on the ce data
156EU2cG following this decay (1966Ha26) and the {+153}Eu(3n,|g) reaction.
156EU cG M$Normalization of the ce spectrum and the |g-ray spectrum to deduce
156EU2cG conversion coefficients for the |g transitions was done using the
156EU3cG theoretical value, |a(K)=0.062, for the 165.8, E1 G. The |a(K)exp value
156EU4cG for this |g was measured relative to that of the 123, E2 |g in {+154}Eu
156EU5cG decay, for which the theoretical value, |a(K)=0.65, was used
156EU6cG (1966Ha26).
156EU cG M(X)$Value from the {+153}Eu(3n,|g) reaction. It is included to help
156EU2cG obtain an intensity balance in the level scheme.
156EU cG CC Computed from the more precise E|g values in the
156EU2cG {+156}Eu Adopted |g radiations data set.
156EU cL E From least-squares fit to |g energies.
156EU cL J J|p and band assignments are from {+156}Eu Adopted Levels,
156EU2cL and are similar to those proposed by 1966Ha26.
156EU cL T From 1968An09 for excited states.
156EU cL BAND(A)$K{+|p}=0+, g.s. band. configuration=|p5/2[413]-|n5/2[642].
156EU cL BAND(B)$K{+|p}=1- band. configuration=|p5/2[413]-|n3/2[521].
156EU cL BAND(C)$K{+|p}=1+ bandhead. configuration=|p5/2[532]-|n3/2[521].
156EU2cL 1966Ha26 assign the configuration |p7/2[523]-|n 5/2[523] to this state.
156EU3cL 1991Ba06, in order to account for the relatively low log| {Ift} value
156EU4cL of the |b{+-} transition to this level, assume that this latter
156EU5cL configuration is present only as an admixture.
156EU cL BAND(D)$K{+|p}=0- bandhead. configuration=|p5/2[532]-|n5/2[642].
156SM P 0 0+ 9.4 H 2 722 8
156SM DP T From 156SM Adopted Levels and based on 1963Gu04.
156SM DP QP From 2011AuZZ.
156EU N 1.01 16 1.01 16 1.0
156EU PN 2
156EU cN NR,NT$Chosen to give 100% I(|g+ce) feeding to the {+156}Eu g.s. From a
156EU2cN 4|p |b|g coincidence measurement, 1963Gu04 give absolute I|g values.
156EU3cN From these latter data, one would deduce I|g normalization|?1.4.
156EU L 0. 0+ 15.19 D 8 A
156EU cL T$From the adopted values.
156EU DL J From G(THETA) following 156EU decay, 1981Ch07 deduce 1+.
156EU B 0.02 LT 9.4 GT
156EU cB $A Fermi |b transition (see, e.g., 1965Wi08, 1966Ha26).
156EU cB IB For a 0+ to 0+ beta transition, systematics (1973Ra10)
156EU2cB suggest log| {Ift}>9.5 in this mass region; this gives I|b<0.015%.
156EUS B EAV=232 3
156EU L 22.6 1 1+ A
156EU B 700 30 48 15 6.00 14 C
156EUS B EAV=223.4 30
156EU G 22.6 1 2.6 5M1 22.4 5 61 12 C
156EUS G L/T=0.751 10$M/T=0.162 4$N+/T=0.0436 12
156EUS G N/T=0.0372 10$O/T=0.00587 16$P/T=0.000575 16
156EU cG RI$From Ice and |a(L). From a proportional-counter measurement,
156EU2cG 1966Ha26 report I|g=7~{I4}.
156EU cG TI$From experimental |g and ce intensities (1966Ha26).
156EU L 47.8 3 2+ A ?
156EU G 25.3 3 (M1) 16.0 7 4.5 19XC
156EUS G L/T=0.739 19$M/T=0.160 8$N+/T=0.0429 23
156EUS G N/T=0.0365 19$O/T=0.0058 3$P/T=0.00057 3
156EU cG TI From electron intensity. Intensity balance gives 2.4 {I9}.
156EU L 87.58 18 1- 12.0 NS 3 B
156EU G 65.0 5 2.3 E1 0.899 23 C
156EUS G KC=0.747 19$LC=0.120 4$MC=0.0258 7$NC+=0.00667 18
156EUS G NC=0.00577 15$OC=0.000845 22$PC=5.87E-5 14
156EU G 87.6 2 24 7 E1 0.406 7 C
156EUS G KC=0.340 6$LC=0.0516 8$MC=0.01111 18$NC+=0.00290 5
156EUS G NC=0.00250 4$OC=0.000372 6$PC=2.78E-5 5
156EU L 125.68 20(2-) B
156EU G 38.1 1 3 LTM1 4.77 8 C
156EUS G LC=3.74 6$MC=0.809 13$NC+=0.217 4
156EUS G NC=0.185 3$OC=0.0293 5$PC=0.00287 5
156EU cG RI From I|g(38)/I|g(103) in {+153}Eu(3n,|g) data, I|g=3.9.
156EU G 103 2 1.8 E1 0.262 15 XC
156EUS G KC=0.220 13$LC=0.0327 19$MC=0.0070 5$NC+=0.00184 11
156EUS G NC=0.00159 10$OC=0.000238 14$PC=1.85E-5 10
156EU L 267 1 1- D
156EU cL E$Level placed by the evaluator to accommodate the 219 |g reported by
156EU2cL 1966Ha26, but not placed by them (see the comment on the 219 |g).
156EU B 0.5 4 7.3 4
156EUS B EAV=136.0 28
156EU cB LOGFT$Calculated by the evaluator using the reported I|g value for the
156EU2cB 219 |g and the adopted properties of the |g's deexciting this level.
156EU G 219 1 0.5 3
156EU cG $|g observed, but not placed, by 1966Ha26. Following 1991Ba06, the
156EU2cG evaluator has associated it with the 219.27 |g seen in {+153}Eu(3n,|g)
156EU3cG and has shown it as feeding the well-established 47.8, 2+ level.
156EU L 291.4 3 1+ 0.2 NS LE C
156EU B 415 25 44 8 5.32 9 C
156EUS B EAV=127.7 27
156EU G 165.8 5 13 2 E1 0.0723 12 C
156EUS G KC=0.0613 10$LC=0.00869 15$MC=0.00187 3$NC+=0.000493 8
156EUS G NC=0.000423 7$OC=6.48E-5 11$PC=5.47E-6 9
156EU G 204.0 5 21 2 E1 0.0416 7 C
156EUS G KC=0.0353 6$LC=0.00494 8$MC=0.001062 17$NC+=0.000281 5
156EUS G NC=0.000241 4$OC=3.71E-5 6$PC=3.23E-6 5
156EU G 244.0 8 2.1 8 [M1,E2] 0.132 21 C
156EUS G KC=0.106 24$LC=0.0203 21$MC=0.0045 6$NC+=0.00118 13
156EUS G NC=0.00102 12$OC=0.000154 11$PC=1.1E-5 4
156EU G 268.5 8 2.4 8 [M1,E2] 0.100 18 C
156EUS G KC=0.081 19$LC=0.0148 8$MC=0.00327 25$NC+=0.00086 5
156EUS G NC=0.00074 5$OC=0.000113 3$PC=8.E-6 3
156EU G 291.0 8 2.8 10[M1] 0.0954 15
156EUS G KC=0.0809 13$LC=0.01133 18$MC=0.00244 4$NC+=0.000657 11
156EUS G NC=0.000560 9$OC=8.89E-5 14$PC=8.87E-6 14