Nuclear Wallet Card - Z( 99)
Isotope[1] delta T1/2 or
Z El A Jpi[2] (MeV)[3] Abundance[4] Decay Mode[5]
=== === ==== ======= ========= ============= =====================
99 Es 242 64.9s ~ 7 s EC ,EF
243 64.9s 21 s 2 EC <= 70%,A >= 30%
244 66.0s 37 s 4 EC 96%,A 4%
245 (3/2-) 66.4s 1.1 m 1 EC 60%,A 40%
246 (4-,6+) 68.0s 7.7 m 5 EC 90.1%,A 9.9%
247 (7/2+) 68.60s 4.55 m 26 EC ~ 93%,A ~ 7%
248 (2-,0+) 70.29 27 m 4 EC > 99%,A ~ 0.25%
249 7/2(+) 71.17s 102.2 m 6 EC 99.43%,A 0.57%
250 (6+) 73.27s 8.6 h 1 EC > 97%,A < 3%
250M 1(-) 73.27s 2.22 h 5 EC >= 99%,A <= 1%
251 (3/2-) 74.504 33 h 1 EC 99.51%,A 0.49%
252 (5-) 77.29 471.7 d 19 A 76%,EC 24%,B- ~ 0.01%
253 7/2+ 79.008 20.47 d 3 A,SF 8.7E-6%
254 (7+) 81.988 275.7 d 5 A,EC <1.0E-4%
SF <3.0E-6%
254M 2+ 82.066 39.3 h 2 B- 98%,IT < 3%
A 0.33%
255 (7/2+) 84.08 39.8 d 12 B- 92%,A 8%,SF 4.1E-3%
256 (1+) 87.15s 25.4 m 24 B-
256M (8+) 87.15s ~ 7.6 h B-
257 89.4s 2 s ? SF ?%
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