97NB 97ZR B- DECAY 10NDS 201004 97NB H TYP=FUL$AUT=N. NICA$CIT=NDS 111, 525 (2010)$CUT=19-Nov-2009$ 97NB CB IB calculated from IG balance in level scheme 97NB CB LOGFT(F)$LOGFT too low for second forbidden B transition; see 97NB2CB comment above 97NB CG The EKC of 1971Mu13 were obtained from measured I(CEK)/IG, 97NB2CG normalized to KC(743G M4)=0.0185. 97NB CG E,RI$Weighted average of measurements by 1968Si02, 1970Ar11, 1970Ho01 97NB2CG 1970Me06, 1970Mi02, 1972TiZS, unless otherwise noted 97NB CG M,MR$From GG(THETA) (1978Kr03), unless otherwise noted 97NB CG E(A),RI(A)$Observed by 1972TiZS only 97NB CG M(B)$Deduced from RUL 97NB CG M(E)$^D,E2 deduced from RUL, level scheme limits mult to E1 97NB CL The level scheme is based on EG, IG, GG data of 1968Si02 and 97NB2CL modified and refined by subsequent measurements of EG, IG, GG, by 97NB3CL 1970Ar11, 1970Ho01, 1970Me06, 1970Mi02, 1972TiZS, 1975Co26. The level 97NB4CL scheme shown here omits the levels previously suggested at 1547 and 97NB5CL 2056 KEV. It is felt that the experimental basis for the placement of 97NB6CL the 804.52G deexciting a level at 1547 KEV is lacking; if this G 97NB7CL deexcites a 1547-KEV level, then the coin spectra of 1970Me06 require 97NB8CL that the 218.90G is a triplet (feeding both the 1547 and 1548-KEV 97NB9CL levels and also 1433-KEV level). The 2056-KEV level is omitted 97NBACL because although the coin data (1970Me06) indicate that the 508G is 97NBBCL a doublet, it has not been shown that it feeds the 1548 level 97NBCCL directly. 97NB CL Although seemingly well established, the decay scheme still 97NB2CL presents several difficulties: 1) B- feeding of the 1851.71 KEV 5/2+ 97NB3CL level. 1970Me06 measure the EB-(max.)=825 30 KEV in coin with the 97NB4CL 1851G, implying direct B- feeding to this level, yet strong 1851.61G 97NB5CL to GS will not allow J<5/2 or JPI=5/2- for this level. The BETA-group 97NB6CL is, therefore, a second forbidden nonunique transition which should 97NB7CL have LOGFT>11.0, I.E. IB-<10E-3%. 2) B- feeding of the 1750.43 KEV 5/2+ 97NB8CL level. Again, the LOGFT=8.25 is too low for 1/2+ to 5/2+ 97NB9CL B- transition, but strong decay to 9/2+ GS rules out J<5/2 or JPI=5/2- 97NB CL Additional data: 1969Be83: GG(T); 1970Be86, 1978Kr03: 97NB2CL GG(THETA); 1970Ho01, 1970Me06: BG; 1970Mi02: (CE)G, BG; 1971Mu13: 97NB3CL I(CE), KC, GG(THETA); 1976Pr13: BG(THETA); 1979Bo26: EG (curved 97NBxCL crystal spect.) 97NB CL E$From least squares fit to EG 97NB CL J,T(D)$From adopted levels 97NB CL T$From GG(T) (1969Be83) 97ZR P 0.0 1/2+ 16.749 H 8 2659.0 18 97ZR CP $ADOPTED VALUES FOR 97ZR 97NB N 0.9309 16 1.0 1.00 97NB CN SUMOF (IG to GS)=100 97NB PN 2 97NB G 294.8 4 0.09 3 97NB CG Observed by 1970Ar11, 1972TiZS 97NB G 410 1 0.07 5 97NB CG Observed by 1970Me06 in coin with 804.52G 97NB G 772 3 0.26 14 A 97NB G 775.0 8 0.20 A 97NB G 804.52 9 0.66 8 97NB G 805.6 8 0.30 A 97NB G 1018.1 8 0.40 A 97NB G 1026.7 8 0.30 A 97NB G 1110.44 19 0.10 2 97NB CG E$previously assigned to 1851.71 6 level. However, weighted 97NB2CG average of all EG measurements leads to 1110.44+743.35=1853.79, 2.08 97NB3CG KEV higher than the E(level) obtained from least squares fit. 97NB G 1361.0 8 0.7 A 97NB L 0.0 9/2+ 72.1 M 7 D 97NB2 L %B-=100$ 97NB CL %B-$FROM ADOPTED LEVELS 97NB L 743.35 3 1/2- 58.7 S 18 DM 97NB B 87.8 4 7.227 3 97NBS B EAV=757.30 83 97NB CB E$1840 50 (1970Ho01) 97NB G 743.36 3 100 [M4] 0.0210 97NBS G KC=0.0181 3$LC=0.00237 4$MC=0.000423 6$NC+=6.47E-5 9 97NBS G NC=6.14E-5 9$OC=3.32E-6 5 97NB CG E$from 1979Bo26 97NB L 1147.96 6 7/2+ 0.15 NS LE 97NB CL J$not 5/2+ (GG(THETA) 1978Kr03) 97NB G 1147.97 8 2.81 11M1+E2 +0.5 2 5.47E-4 97NBS G KC=0.000481 8$LC=5.31E-5 8$MC=9.34E-6 14$NC+=3.56E-6 9 97NBS G NC=1.371E-6 20$OC=8.05E-8 13$IPC=2.11E-6 8 97NB L 1251.01 7 3/2- 97NB CL J$BG(THETA) agrees with JPI=5/2-, rules out J=1/2 (1976Pr13) 97NB B 3.90 20 8.046 23 97NBS B EAV=528.97 80 97NB G 507.64 8 5.4 2 97NB CG M$EKC=0.0082 9 (1971Mu13); (theory: KC(E2)=0.00432, 97NB2CG KC(M1)=0.00344) 97NB L 1276.09 7 5/2+ 97NB B 0.12 8 9.5 3 F ? 97NBS B EAV=517.93 80 97NB G 1276.07 9 1.01 6 97NB L 1433.92 13 5/2- 97NB G 182.9 5 0.034 7 97NB G 690.52 16 0.197 19 97NB L 1548.36 11 (3/2+,5/2-) 97NB B 0.36 5 8.68 6 97NBS B EAV=400.08 77 97NB CB E$1050 50 from B(1276G) (1970Ho01) 97NB G 272.40 16 0.25 3 97NB G 297.2 3 0.071 12 97NB G 400.42 16 0.263 17 97NB L 1652.82 21 97NB B 0.102 21 9.07 9 ? 97NBS B EAV=356.02 76 97NB G 218.9 2 0.18 2 97NB L 1750.43 9 5/2+ 0.2 NS LE 97NB CL J$not 7/2+ (GG(THETA) 1978Kr03); J agrees with 7/2 GG(THETA) 97NB2CL (1971Mu13) 97NB B 0.46 17 8.25 16 F ? 97NBS B EAV=315.57 74 97NB CB E$920 30 from B(1148G) (1970Me06) 97NB G 202.5 6 0.031 9 D,E2 B 97NB G 473.5 6 0.08 4 D,E2 B 97NB G 602.37 14 1.48 8 M1+E2 +0.11 6 0.00228 97NBS G KC=0.00201 3$LC=0.000225 4$MC=3.96E-5 6$NC+=6.14E-6 9 97NBS G NC=5.80E-6 9$OC=3.39E-7 5 97NB G 1750.24 22 1.17 11 97NB L 1764.42 14 (3/2-) 97NB B 1.77 18 7.64 5 97NBS B EAV=309.83 74 97NB G 111.6 3 0.070 10 97NB G 330.43 19 0.154 16 97NB G 513.41 18 0.59 5 97NB G 1021.2 3 1.09 18 97NB L 1851.71 6 5/2+ 0.2 NS LE 97NB CL J$not 7/2+ (GG(THETA) 1978Kr03) 97NB B 0.27 11 8.29 18 ? 97NBS B EAV=274.44 73 97NB CB E$825 30 from B(1852G) (1970Me06) 97NB G 305.1 9 0.03 2 D,E2 B 97NB G 600.6 6 0.2 LT 97NB G 703.76 5 1.09 5 M1+E2 +0.19 8 1.60E-3 97NBS G KC=0.001410 20$LC=0.0001572 23$MC=2.77E-5 4$NC+=4.30E-6 7 97NBS G NC=4.06E-6 6$OC=2.37E-7 4 97NB G 1851.61 9 0.33 3 97NB L 1958.4 6 97NB B 0.032 17 9.00 23 ? 97NBS B EAV=232.18 74 97NB G 707.4 6 0.034 18 97NB L 2105.91 6 (3/2+) 0.2 NS LE 97NB CL J$J=1/2 ruled out GG(THETA) (1971Mu13) 97NB B 4.95 17 6.448 16 97NBS B EAV=175.92 67 97NB CB E$560 30 from B(355G) (1970Me06); 550 10 from 97NB2CB (1749G+1851G)(B-) (1970Mi02) 97NB G 254.17 14 1.23 8 M1+E2 0.030 11 97NBS G KC=0.026 10$LC=0.0032 14$MC=0.00057 24$NC+=9.E-5 4 97NBS G NC=8.E-5 4$OC=4.1E-6 14 97NB CG KC(E2)=0.0351, KC(M1)=0.0164 97NB CG M$from EKC=0.039 6 (1971Mu13); from EKC LT 0.02 from GCE/GB- 97NB2CG (1970Mi02) 97NB CG MR$-0.04 3 or +3.9 +5-4 (1978Kr03) 97NB G 355.40 9 2.25 10M1+E2 0.011 3 97NBS G KC=0.0092 22$LC=0.0011 3$MC=0.00019 6$NC+=2.9E-5 8 97NBS G NC=2.8E-5 8$OC=1.5E-6 3 97NB CG KC(E2)=0.0113, KC(M1)=0.00707 97NB CG M$from EKC=0.014 2 (1971Mu13); EKC=0.0050 25 from GCE/GB- 97NB2CG (1970Mi02) 97NB CG MR$-0.04 3 or +4.0 5 (1978Kr03) 97NB G 558 1 0.03 2 97NB G 829.79 9 0.257 19 97NB G 854.89 8 0.383 24(E1) 4.21E-4 E 97NBS G KC=0.000372 6$LC=4.08E-5 6$MC=7.17E-6 10$NC+=1.111E-6 16 97NBS G NC=1.050E-6 15$OC=6.11E-8 9 97NB G 1362.68 9 1.10 11[E1] 3.22E-4 97NBS G KC=0.0001559 22$LC=1.698E-5 24$MC=2.98E-6 5$NC+=0.0001461 21 97NBS G NC=4.37E-7 7$OC=2.57E-8 4$IPC=0.0001456 21 97NB L 2203 2 ? 97NB G 2203 2 ? 97NB CG RI$weak 97NB L 2247.46 15 3/2- 97NB B 0.38 3 7.12 4 97NBS B EAV=124.84 64 97NB G 699.2 3 0.108 21 97NB G 971.34 15 0.299 18