237NP 237U B- DECAY 1966YA05,1960UN01 06NDS 200608
237NP H TYP=FUL$AUT=M. S. Basunia$CIT=NDS 107, 3323 (2006)$CUT=15-Mar-2006$
237NP c Other measurements: 1949Me43, 1953Wa05, 1956Ba39, 1957Bu42, 1957Ra04,
237NP2c 1966El12, 1968Da24, 1971Cl03, 1982BuZF,1985He02,1985Wi04.
237NP c 1966Ya05: Source produced by {+236}U(n,|g); Detector: Ge(Li) and
237NP2c Si(Li); Measured: E|g, I|g, |a, deduced level scheme.
237NP cB |b intensities shown on the decay scheme have been deduced
237NP2cB from intensity balance at each level. Measured |b energies and
237NP3cB intensities are:
237NP tB
237NP2tB 1956Ba39 1957Ra04
237NP3tB E|b I|b E|b I|b
237NP4tB ----------- ---------
237NP5tB 84 {I5} 26%
237NP6tB 249 {I5} 74% 248 96%
237NP7tB no E|b{+-}>266 no E|b{+-}=450 < 1%
237NP8tB
237NP9tB Other measurements: 1949Me43, 1953Wa05.
237NP2tB
237NP cB Nuclear finite size effects on the absolute ft values were
237NP2cB reported in 1966Bo08. For calculations of screening corrections to the
237NP3cB Fermi function for allowed |b decay, see 1966Ma57.
237NP tG |g|g: 1953Wa05, 1957Ra04.
237NP tG |b|g: 1953Wa05
237NP tG |g|g(|q,t):
237NP2tG (208|g)(59|g)(|q): A{-2}=-(0.046|+0.005); |d(208|g)>0 1968H
237NP+tG r01
237NP3tG A{-2}=-(0.07|+0.02) ; |d(208|g)>0 1980An23
237NP4tG A{-2} value constant for T{-1/2}<250 ns 1968Hr0
237NP+tG 1, 1980An
237NP+tG 23
237NP5tG others: 1960Un01, 1960
237NP+tG St18
237NP6tG
237NP tG X rays (Np):
237NP2tG E(x-ray) I(x-ray)
237NP3tG ----------------------------- --------------------
237NP3tG 1966Ya05 1982Ba56 1976GuZN 1966Ya05 1976GuZN
237NP4tG (semi) (cryst) (semi) rel to (%)
237NP5tG from (n,|g) I(208|g)
237NP6tG =21.2
237NP7tG ====== ========== ========== ========= ==========
237NP8tG 11.9 1.38 {I15} L{-{
237NP+tG Sl}} x ray
237NP9tG 14.0 24.4 {I26} L{-|
237NP+tG a} x ray
237NP2tG 17.8 25.9 {I26} L{-|
237NP+tG b} x ray
237NP3tG 20.8 7.0 {I7} L{-|
237NP+tG g} x ray
237NP4tG 97.0 97.069 {I3} 97.071 {I5} 16.1 {I17} 15.8 {I7}
237NP+tG K|a{-2}| x ray
237NP5tG 101.0 101.057 {I3} 101.066 {I5} 22.5 {I24} 25.2 {I8}
237NP+tG K|a{-1}| x ray
237NP6tG 113.308 {I4} 113.300 3.04 {I16} K
237NP+tG |b{-3} x ray
237NP7tG 113.5 9.8 {I10} K|b{
237NP+tG -1}'| x ray
237NP8tG 114.244 {I3} 114.230 5.85 {I18} K
237NP+tG |b{-1} x ray
237NP9tG 114.950 0.335 {I34} K|b{
237NP+tG -5} x ray
237NP2tG 117.340 0.790 K|b{-4}
237NP+tG x ray
237NP3tG 117.580 1.56 K|b{-2}
237NP+tG x ray
237NP4tG 117.5 3.1 {I4} K|b{
237NP+tG -2}'| x ray
237NP5tG
237NP6tG other measurements: 1957Ra04, 1990Po14, 1992Ba08.
237NP cG E From adopted levels, except otherwise noted.
237NP cG E(Z) From 1966Ya05.
237NP cG RI From 1976GuZN, 1985He02, and 1985Wi04, except where
237NP2cG indicated. Intensities of the strong transitions were only measured in
237NP3cG 1985He02 and 1985Wi04. These intensities are converted by the
237NP4cG evaluator from per 100 {+241}Pu decays to per 100 {+237}U |b{+-} decays
237NP5cG by using the adopted |a branching of 2.45|*10{+-3}% {I2} for {+241}Pu
237NP6cG decay. The I|g's of 1976GuZN were measured as absolute intensities.
237NP7cG The I|g's recommended in 1986LoZT were obtained from the weighted
237NP8cG average of intensities in 1985Wi04, 1985He02, 1984BaYS,
237NP9cG 1966Ya05, 1971Cl03, 1976GuZN and 1982BuZF. The I|g's of 1985He02 and
237NP2cG 1985Wi04 were recalculated by taking the |a branching for {+241}Pu as
237NP3cG 2.41|*10{+-3}% {I4}, and relative intensities of 1966Ya05, 1971Cl03 and
237NP4cG 1984BaYS were renormalized in 1986LoZT at I|g(208|g) to 21.6.
237NP5cG See also 1966El12 for the absolute photon intensities measured
237NP6cG using 4|p(|b|g) technique.
237NP cG M,MR From ce measurements in 1966Ya05. See also {+241}Am |a decay.
237NP2cG The Ice's given in 1966Ya05 are renormalized (by a factor of 0.96 {I2})
237NP3cG at L-subshells of 164.61-keV E2 transition by using the adopted
237NP4cG I|g=1.86 {I3} and the theoretical L1, L2, L3 conversion coefficients.
237NP cG M(A) Anomalously converted. See 1960As02 and 1966Ya05 for
237NPxcG discussions.
237NP cG CC(A) Experimental conversion coefficient, from 1966Ya05.
237NP2cG |a(K)(412|g of {+198}Au |b{+-} decay)=0.0302 {I5} (1990Zh04 recommend
237NP3cG 0.0302 {I3}) was used to normalize their measured Ice and I|g's.
237NP cG E(S) Not observed in {+237}U |b{+-} decay. Energy from {+241}Am
237NPxcG |a decay.
237NP cL E From a least square fit to the |g-ray energies.
237NP cL J From adopted levels.
237NP cL E(A) 5/2[642] band
237NP cL E(B) 5/2[523] band
237NP cL E(C) 1/2[530] band
237NP cL E(D) 1/2[400] band
237U P 0.0 1/2+ 6.75 D 1 518.6 6
237NP N 1.0 1.0 1.0 1.0
237NP PN 1.0 1.0 3
237NP G 114.09 5
237NP cG Photon was masked by K|b| x ray; three conversion lines were
237NP2cG identified in 1966Ya05: L1:L2:L3=20 {I4}:20 {I4}:22 {I4};
237NPxcG Ice(L3)=0.022% {I4}.
237NP G 340.45 0.00165 33
237NP cG Seen only in 1976GuZN.
237NP L 0.0 5/2+ 2.14E+6 Y 1 A
237NP cL T From adopted levels.
237NP L 33.196 9 7/2+ A
237NP G 33.196 1 0.130 5 M1+E2 0.13 3 185 23
237NPS G LC=138 18 $ MC=35 5
237NP L 59.545 10 5/2- 63 NS 5 B
237NP cL T From 208|g and 59.6|g |g|g(t) in 1960Un01.
237NP B 3.0 23 8.5 2 1U?
237NPS B EAV=137.57 19
237NP cB Intensity balance at the 59-keV level yields I|b=4|+7 for the
237NP2cB possible |b{+-} feeding. Sum of |g transitions decaying from higher
237NP3cB levels to the 5/2[642] and 5/2[523] bands is 97.0% {I23}, which
237NP4cB suggests that, unless there are additional (as yet unobserved) |g's
237NP5cB decaying to these bands, 3.0% {I23} |b{+-} feeds the levels below 267
237NP6cB keV. The 5/2- state at 59 keV is the most likely candidate for
237NP7cB such a feeding; however, 1957Ra04 did not observe this
237NP8cB possible |b{+-} transition and set an upper limit of 1%.
237NP G 26.3446 2 2.43 6 E1 8 2 A
237NPS G ELC=6 2 $ EMC=1.6 2
237NP cG E 26.3448 {I2} from {+241}Am |a decay.
237NPB G BE1W=3.9E-6 13
237NP G 59.5409 1 34.5 8 E1 1.16 7 A
237NPS G ELC=0.84 6 $ EMC=0.226 7 $ ENC+=0.094 10
237NP cG E 59.5412 {I2} from {+241}Am |a decay.
237NP cG CC obtained from measured Ice's and I|g's. See also
237NP2cG {+241}Am |a decay.
237NPB G BE1W=4.8E-6 6
237NP L 75.91 5 9/2+ A
237NP G 42.704 5 (M1+E2) 0.13 AP 80 AP S S
237NPS G LC AP 59 $ MC AP 15
237NP G 75.8 2 S S
237NP L 102.965 13 7/2- B
237NP G 43.420 3 0.0240 20 M1+E2 0.41 2 167 9
237NPS G LC=124 7 $ MC=32.8 18
237NP G 69.76 3 0.00095 19(E1) 0.336 S S
237NPS G LC=0.252 $ MC=0.0621 $ NC+=0.0219
237NP cG RI$calculated by the evaluator from I|g(69.76|g)/I|g(43.423|g)=2.9
237NP2cG {I4}/73 {I8}, as measured in {+241}Am |a decay.
237NP G 102.98 2 0.0064 9 E1 0.121 S S
237NPS G LC=0.091 $ MC=0.022 $ NC+=0.0080
237NP cG RI$calculated by the evaluator from
237NP2cG I|g(102.98|g)/I|g(43.423|g)=19.5 {I1}/73 {I8}, as measured in {+241}Am
237NPxcG |a decay.
237NP L 267.561 14 3/2- 5.2 NS 2 C
237NP cL T Weighted average of 5.2 ns {I5} (208|g(t) - 1957Bu42), 5.2
237NP2cL ns {I2} (208|g(t) - 1960Un01), and 5.0 ns {I2} (268|g(t) - 1960Un01).
237NP B 42 3 6.53 4
237NPS B EAV=68.59 18
237NP G 164.61 2 1.86 3 E2 1.74 Z
237NPS G KC= 0.199 $LC= 1.12 $MC= 0.309 $NC+= 0.117
237NP cG RI 1.865 {I23} (from 457 {I4} per 1000 {+241}Pu decays;
237NP2cG 1985He02), 1.853 {I23} (from 454 {I4} per 1000 {+241}Pu decays;
237NP3cG 1985Wi04). I|g=1.84 {I5} per 100 {+237}U |b{+-} decays (1976GuZN).
237NPB G BE2W=0.201 12
237NP G 208.005 23 21.2 3 M1+E2 +0.156 5 3.18 Z
237NPS G KC= 2.504 4$LC=0.504 $MC=0.123 $NC+=0.046
237NP cG RI 21.2 {I3} (from 5200 {I50} per 1000 {+241}Pu decays;
237NP2cG 1985He02, 1985Wi04). I|g=21.7 {I5} per 100 {+237}U |b{+-} decays
237NPxcG (1976GuZN).
237NP cG |a(K)exp=2.30 {I12} determined in 1966Ya05 by comparing ce
237NP2cG and |g intensities of 208|g with those of 411.8|g from {+198}Au taking
237NP3cG |a(K)=0.0302 {I5} for the 411.8|g.
237NP cG MR positive sign for |d is from |g|g(|q) measurements.
237NPB G BM1W=0.000102 6$BE2W=0.0169 15
237NP G 234.40 4 0.0205 7 M2 8.66 Z
237NPS G KC= 5.87 $LC= 2.05 $MC= 0.537 $NC+= 0.205
237NPB G BM2W=0.047 4
237NP G 267.54 4 0.712 10 E1+M2 0.490 15 1.11 6 Z
237NPS G KC= 0.77 4$LC= 0.250 12$MC= 0.065 4$NC+=0.0246 12
237NP cG RI from 0.714 {I22} (1.75 {I5} per 1000 {+241}Pu decays,
237NP2cG 1985He02) and 0.711 {I10} (1.741 {I15} per 1000 {+241}Pu decays,
237NP3cG 1985Wi04). I|g=0.740 {I18} per 100 {+237}U |b{+-} decays (1976GuZN).
237NPB G BE1W=1.07E-8 8$BM2W=0.164 14
237NP L 281.368 20 1/2- C
237NP B 51 4 6.37 4
237NPS B EAV=64.54 18
237NP G 13.81 2 0.099 4 M1+E2 0.0321 10 518 16 Z
237NPS G MC= 390 13
237NP cG RI calculated by the evaluator from Ice(M1)=29.9 {I3} and
237NP2cG |a(M1)=303 {I9}.
237NP G 221.80 4 0.0212 7 E2 0.560 Z
237NPS G KC= 0.132 $LC= 0.310 $MC= 0.0853 $NC+= 0.0323
237NP L 332.385 19 1/2+ 1.0 NS LE D
237NP cL T From 332|g(t) in 1960Un01.
237NP B 3.4 3 7.21 4
237NPS B EAV= 49.83 17
237NP G 51.01 3 0.340 10 E1 0.767 Z
237NPS G LC= 0.574 $MC= 0.143 $NC+= 0.0502
237NPB G BE1W=0.0001195 16
237NP G 64.83 2 1.282 17 E1 0.408 Z
237NPS G LC= 0.306 $MC= 0.075 $NC+= 0.027
237NP cG RI from 314 {I3} per 1000 {+241}Pu decays (1985Wi04).
237NP2cG 1.28 {I2} per 100 {+237}U |b{+-} decays (1976GuZN).
237NPB G BE1W=0.0002195 20
237NP G 332.35 3 1.200 16 E2 0.150
237NPS G KC= 0.0640 $LC= 0.0624 $MC=0.0169 $NC+=0.0064
237NP cG RI from I|g=294 {I3} per 1000 {+241}Pu decays (1985Wi04).
237NP2cG I|g=1.21 {I3} per 100 {+237}U |b{+-} decays (1976GuZN).
237NPB G BE2W=0.5077 20
237NP L 368.59 3 5/2+ D
237NP G 292.77 6 0.0025 7 [E2] 0.220
237NPS G KC=0.0808 $ LC=0.101 $ MC=0.0275 $ NC+=0.0104
237NP cG E 292.77 {I6} from {+241}Am |a decay.
237NP cG RI from I|g(292.7|g)/I|g(208.0|g)=0.00012 {I3}, as measured in
237NPxcG 1966Ya05.
237NP G 309.1 3 0.00027 S S
237NP cG RI from I|g(309|g)/I|g(335|g)=0.14/49.6, as measured in
237NPxcG {+241}Am decay.
237NP G 335.37 3 0.0951 22 M1+E2 0.46 17 0.74 9
237NPS G KC= 0.57 8$LC= 0.121 9$MC= 0.0296 20$NC+=0.0110 8
237NP cG RI from I|g=23.3 {I5} per 1000 {+241}Pu decays (1985Wi04).
237NP2cG I|g=0.097 {I3} per 100 {+237}U |b{+-} decays (1976GuZN).
237NP G 368.62 3 0.0392 17 M1(+E2) 0.31 LT 0.64 2
237NPS G KC=0.51 2 $ LC=0.100 3 $ MC=0.0244 6 $ NC+=0.0091 2
237NP cG RI from I|g=9.6 {I4} per 1000 {+241}Pu decays (1985Wi04).
237NP2cG I|g=0.043 {I2} per 100 {+237}U |b{+-} decays (1976GuZN).
237NP L 370.93 3 3/2+ D
237NP B 0.8 AP 7.5 AP
237NPS B EAV=38.98 17
237NP G 2.3 S
237NP cG E from level scheme; transition has not been observed.
237NP cG RI if there is no |b{+-} feeding to the 368.59-keV level, the
237NP2cG intensity balance at that level suggests that I(|g+ce)(2.3|g)=0.235
237NPxcG {I11}.
237NP G 38.54 3 0.021 LT (M1+E2) 0.65 GT 492 GT 0.4 APZ
237NP cG TI from measured Ice's.
237NP cG I|g(38.54|g)<0.001 I|g(208|g) (1966Ya05).
237NP G 337.7 5 0.0089 5 (E2) 0.143 Z
237NPS G KC= 0.0622 $LC= 0.0588 $MC=0.0159 $NC+=0.0060
237NP G 370.94 3 0.1073 17 M1+E2 0.43 +7-21 0.57 6
237NPS G KC= 0.45 5$LC= 0.092 7$MC= 0.0225 15$NC+=0.0084 5
237NP cG RI from I|g=26.3 {I4} per 1000 {+241}Pu decays (1985Wi04).
237NP2cG I|g=0.110 {I4} per 100 {+237}U |b{+-} decays in 1976GuZN.