57FE 57CO EC DECAY 1991BAZS,1997HEZZ 98NDS 199812
57FE H TYP=FUL$AUT=M. R. BHAT$CIT=NDS 85, 415 (1998)$CUT=24-Sep-1998$
57FE c 1997Dr06: show the importance of including final state interaction
57FE2c (fsi) in the calculation of double-to-single ratio of K-electron
57FE3c ejection in internal conversion, by leading to a better agreement with
57FE4c experimental data for the 122-keV |g.
57FE c 1996Me11,1995Me11,1994MeZZ,1993MeZY: measured spectra of ce from
57FE2c E|g=122 and 136 keV to determine their conversion coefficients
57FE c 1995Ch70: review/evaluation of {+57}Co decay data
57FE c 1995Ah04: measured T{-1/2} of 14.4-keV level using electronic timing
57FE c 1992ScZZ: measurement of emission probability for 14.4|g.
57FE c 1991BaZS: evaluation and recommended values by the iaea Coordinated
57FE2c Research Project on x-ray and |g-ray Standards for Detector
57FE3c Calibration. Recommended values from this evaluation are used as
57FE4c indicated.
57FE c 1990Si03: measured K-capture probability to the 136 level as
57FExc 0.89 {i4}
57FE c 1989Ba34: measured internal bremsstrahlung spectrum and compared it
57FE2c with Martin and Glauber theory
57FE c 1987Ko38: measured relative intensities and energies of the KLL, KLM,
57FE2c and kmm Auger electrons using an electrostatic spectrometer and
57FE3c observed the intensity ratios: KLL:KLM:km(1-3)M(1-3):K conversion
57FE4c (14 keV)=4.0 {i6}:1.0 {i1}:0.05 {i2}:3.0 {i3}. Also KLM:KLL=0.24 {i5}
57FE5c and kmm:KLL=0.012 {i5}.
57FE c 1986Ca08,1991CaZZ: I(K|a)/I(K|b)=0.134 {i3} (experiment); 0.1343
57FExc (theory)
57FE c 1994Bu26: I(K|a)/I(K|b)=0.1210 {i24} (experiment); 0.1208 (theory)
57FE c 1971Ko19: measured E|g, I|g, Ge(Li) detector
57FE c Others: 1981VyZZ, 1981KhZY, and 1970Ra51
57FE tG
57FE tG Emission probabilities of x-rays (1991BaZS)
57FE tG
57FE tG $----------------------------------------------------------------------
57FE tG $ X-ray E(keV) I(x-ray)
57FE tG $----------------------------------------------------------------------
57FE tG $ Fe K|a 6.40 51.0 {I7}
57FE tG $ Fe K|b 7.06 6.9 {I1}
57FE tG $----------------------------------------------------------------------
57FE tG
57FE cL E From a least-squares fit to the E|g data
57FE cL J From adopted levels. Results deduced from |g(|q,H,t),
57FE2cL |g|g(|q), and |a's are consistent
57FE cG See 1970Ra51 for summary of conversion-electron
57FE2cG ratio measurements (spectrometer, ce) from 1954Al06, 1955Co31,
57FE3cG 1957Be45, 1960Ew04, and 1967Ha06. The ratios have also been measured
57FE4cG by 1971Po05 (spectrometer, ce). These data were used in the present
57FE5cG evaluation as noted below. See 1996Me11 for the ratio of the
57FE6cG intensities of conversion electrons for 122 and 136-keV gammas and
57FE7cG their conversion coefficients. However, the M,|d of these two gammas
57FE8cG derived from the 1996Me11 data are not supported by other
57FE9cG measurements. See the comments on M,|d for these two gammas. Other:
57FExcG see 1981HaZY
57FE cG 14.4|g summary: E|g: from the difference in energies of the
57FE2cG 122|g and 136|g in 1991BaZS which are from the evaluation in 1978He21.
57FE3cG See 1967Be65, 1965Be41, 1976Bo16, 1972He42, and 1971Po05 for
57FE4cG individual measurements. E(ce): E(ce(K))=7.289 {i8}
57FE5cG (1967Ha06,spectrometer); 7.300 {i6} (1963Th04,pc). E(ce(M1))=14.3134
57FE6cG {i2} ("metallic"), 14.3122 {i2} ("oxide"); E(ce(N1))=14.4017 {i2}
57FE7cG ("metallic"), 14.4005 {i2} ("oxide") (1971Po05, spectrometer).
57FE8cG |a: extrapolated from 1976Ba63
57FE cG 122|g and 136|g summary: |d(122|g): weighted av of
57FE2cG |g(|q,H,t) (Ge(Li)): +0.120 {i2} (1972Fo05), +0.116 {i1}
57FE3cG (1973Sc15), +0.1195 {i10} (1975Co22); and |g|g(|q) (Ge(Li)): +0.120
57FE4cG {i4} (1972Kr15). Others: 1972Vi09, 1972Ni01. |d(136|g): zero, since it
57FExcG is Q (1969Sp05).
57FE cG |a(exp),|a(K)exp(122|g,136|g): from 1967Ha06 (spectrometer,
57FE2cG ce/pe). 1967Mu20 has been excluded from consideration since the ce(K)
57FE3cG were not completely separated and there appeared to be no separation
57FE4cG of the higher shell electrons (1985HaZA). Other: 1981HaZY.
57FE5cG K/L+(122|g,136|g): unweighted av of 1954Al06, 1957Be45, 1965Mo22,
57FExcG 1967Ha06.
57FE cG I(K| x ray)/I(14.4|g)=5.58 {i30} (scin,pc; x/|g. 1963Mu02)
57FE2cG and 5.57 (scin, 1966Su11) are in good agreement with 5.85 {i17} from
57FE3cG the adopted decay scheme
57FE cG Coincidences are from 1965Ki03 (Ge(Li),fast-slow coin)
57FE cG E Weighted averages of Ge(Li) measurements by 1965Ki03,
57FE4cG 1965Sp06, and 1971Ko19, except as noted.
57FE cG RI Per 100 parent decays. I|g are from 1971Ko19 normalized to
57FE2cG I|g(14.4)+I|g(136)=19.84 {i17}, except as stated otherwise.
57FE DG NOTE TYPO ERROR 1972Ma06 HAS NOTHING TO DO WITH A=57.
57FE cE IE From |g-ray intensity balance at each level
57FE N 1.0 1.0 1.0
57FE cN I|g(14.4), I|g(122), I|g(136) are as recommended by 1991BaZS;
57FE2cN for |a(14.4), a higher value of 8.56 {i26} extrapolated from 1976Ba63
57FE3cN has been adopted. 1991BaZS point out that |a(14.4)=8.18 {i11}
57FE4cN (1985HaZA) is too low and recommend a higher value. 1992ScZZ whose
57FE5cN I|g(14.4) has been adopted in 1991BaZS, also point out the need for
57FE6cN the higher theoretical |a(14.4). |SI|g(1+|a)=99.7 {i28}.
57FE PN 3
57FE cG M,MR From adopted gammas
57FE cG CC From the evaluation by 1985HaZA, unless indicated otherwise
57FE cG E(A) Recommended energies from 1997HeZZ
57FE cG RI(D) Recommended by 1991BaZS
57CO P 0.0 7/2- 271.74 D 6 836.0 4
57FE L 0.0 1/2-
57FE L 14.4128 3 3/2- 98.3 NS 3
57FE cL T unweighted av of |g|g(t), 97.9 ns {i2} (1961Cl11,NaI), 98 ns
57FE2cL {i1} (1965Ki03,NaI), 97.7 ns {i2} (1966Ec05,NaI), 97.8 ns {i14}
57FE3cL (1978AlZX,scin), 99.2 ns {i4} (1995Ah04,Ge(Li)), and |g|g(|q,H,t),
57FE4cL 99.3 ns {i5} (1969Ho28,NaI). Other: 97 ns {i4}
57FExcL (1978AlZX,X|g(t),scin).
57FE G 14.4129 6 9.16 15 M1+E2 0.00223 18 8.56 26 C
57FE3 G KC=7.76 23$LC=0.804 24 (1976Ba63)
57FE4 G EKC=7.35 19$ECC=8.18 11 (1985HaZA)
57FE cG $K:L:M+=100:9.59 {I13}:1.48 {I15} (1971Po05)
57FE6 G L1/(L2+L3)=10.8 8 (1971Po05)
57FE7 G FLAG=D
57FE cG See summary in comments above
57FE L 136.4737 3 5/2- 9.0 NS 7
57FE cL T from 1978AlZX (X|g(t),scin).
57FE E 99.8 3 6.450 1
57FES E CK=0.8877 $CL=0.09557 $CM+=0.01672
57FE G 122.06065 1285.60 17M1+E2 +0.120 1 0.0240 14 C
57FE3 G KC=0.0214 12$ LC=0.00224 20$ MC+=0.00037 5
57FE dG $|a(K) from |a(K)exp; |a(L),|a(M+) from |a, K/L+, and L/M+
57FE2dG (10% uncertainty assumed in L/M+ by evaluators)
57FE4 G K/(L+M+N)=8.2 6$EKC=0.0214 12 (1967Ha06)
57FE cG $K:L:M+=100:9.0:1.5 (1955Co31)
57FE5 G FLAG=AD
57FE cG See summary in comments above
57FE cG M,MR 1996Me11 claim that E|g=122 keV is mostly E2 with a
57FE2cG negligible M1 component based on their Ice data; this conclusion is
57FE3cG not supported by other data. Their data are: K/L=9.04 {i19};
57FE4cG L1/L2=13.1 {i3}; L1/L3=8.7 {i5}; L1/M=9.7 {i10};
57FExcG |a(L1)exp=2.04|*10{+-2} {i6}; |a(L2)exp=1.56|*10{+-3} {i9};
57FExcG |a(L3)exp=2.34|*10{+-3} {i21}
57FE G 136.47356 2910.68 8 E2 0.137 15 C
57FE3 G KC=0.122 13$LC+=0.0143 13
57FE dG $|a(K) from |a(K)exp; |a(L+), unweighted average from LC+(K/LC++1)=CC
57FE2DG and (KC+L+)/K=K+/K
57FE4 G K/(L+M+N)=8.6 5$EKC=0.122 13 (1967Ha06)
57FE cG $|a/K=1.118 {I5} (1967Ha06)
57FE5 G FLAG=AD
57FE cG See summary in comments above
57FE cG M,MR 1996Me11 claim that the relative weight of the E2 component
57FE2cG for the E|g=136 keV is: 83% {I+8-12}; this conclusion is not supported
57FE3cG by other data. Their data are: K/L=8.68 {i27}; L1/L2=12.2 {i16};
57FE4cG L1/L3=9.0 {i18}; L1/M=7.9 {i22}; |a(L1)exp=1.2|*10{+-2} {i3};
57FExcG |a(L2)exp=1.0|*10{+-3} {i4}; |a(L3)exp=1.4|*10{+-3} {i6}
57FE L 366.89 133/2- 4 NS LE
57FE cL T from 1965Ki03 (|g|g(t),NaI)
57FE G 230.4 4 4E-4 4 (M1+E2) +0.02 8
57FE cG Not observed by 1965Ma38 or clearly seen by 1965Sp06
57FE cG MR -0.186<|d<-0.072 or -6.99<|d<-2.38 (1975Co22)
57FE G 352.33 213.0E-3 3 M1+E2 +0.025 9
57FE cG MR +0.038 {i10} or +3.35 {i12} (1975Co22)
57FE G 366.8 3 1.2E-3 3 M1+E2 -0.45 5
57FE cG MR -0.047 {i25} or -1.56 {i9} (1975Co22); not consistent with
57FE2cG other results
57FE L 706.76 7 5/2-
57FE E 0.174 10 7.70 3
57FES E CK=0.8791 $CL=0.10274 3$CM+=0.018148 6
57FE G 339.69 213.7E-3 3 M1+E2 +0.083 5 C
57FE G 570.09 200.0158 10M1+E2 +0.097 8 C
57FE G 692.41 7 0.149 10M1+E2 -0.465 8
57FE G 706.54 225.0E-3 5 [E2]