Table II. Summary of Fission (Shape) Isomers

Nuclide E(Isomer)a Jp t1/2 %IT b Q0 Selected references
233Th 1850 250 1-100 ns 94Ob02
236U 2750 10 cd (0+) 120 ns 2 87 6 32 5 78Gu02, 80Me15, 89Ma57, 90Ma59, 94ReAA
238U 2557.6 5 cd 0+ 298 ns 18 ~95 29 3 69La14, 79Ul01, 82Go02, 92St05
2557.6+y >1 ns 89Ha40
237Np 2800 400 45 ns 5 e 73Wo03, 77Mi09
235Pu 3000 200 25 ns 5 69Me11, 70Bu02, 78SoZP, 89SoZZ
236Pu ~3000 (0+) 37 ps 4 37+14-8 74MeYP, 77Me08
4000 200 34 ns 8 69La14, 71Br39
237Pu 2600 200 85 ns 15 f 69La14, 79Gu03, 82Ra04
2900 250 1.1 ms 1 70Po01, 73Va16, 79Gu03
238Pu ~2400 0.6 ns 2 73Li01, 74MeYP
~3500 (0+) 6.0 ns 15 70Bu02, 71Br39, 73Na35, 92DeZZ
239Pu 3100 200 c (5/2+) 7.5 ms 10 36 4 70Po01, 77Ha01, 79Ba02
~3300d (9/2-) 2.6+40-12 ns 77GoZH, 80Gu20
240Pu ~2800c (0+) 3.7 ns 3 71Br39, 72Sp06, 73Be10, 86De04, 94PaAA
241Pu ~2200 21 ms 3 70Po01, 70Ga10, 73Be05
~2300 32 ns 5 69La14, 81Gu04
242Pu ~2200 3.5 ns 6 74Me10, 75Me28
2200+y 28 ns 69La14, 70Po01
243Pu 1700 300 45 ns 15 69La14, 70Vi05, 80Bj02
244Pu x 0.40 ns 10 74MoYC
245Pu 2000 400 90 ns 30 71Au06, 80Bj02
237Am 2400 200 5 ns 2 70Po01, 71Br39, 73Br38
238Am ~2500 35 ms 10 67Bo23, 72Br35, 73Fl03
239Am 2500 200 (7/2+) 163 ns 12 g 69La14, 72Br35, 85Ra28
240Am 3000 200 0.94 ms 4 32.7h 20 71Br39, 79Be46, 85Jo04
241Am ~2200 1.0 ms 3 69La14, 72Br35, 73Be04, 93Ku16
242Am 2200 80 14.0 ms 10 62Po09, 63Pe27, 85Ku18, 92Ba67
243Am 2300 200 5.5 ms 5 70Po01, 72Wo07, 87Gu03
244Am 2800 400 0.90 ms 15 68Bj04, 69Bo25, 72Wo07
2800+y ~6.5 ms 69SlZZ
245Am 2400 400 0.64 ms 6 72Wo07, 73Br38, 80Bj02
246Am ~2000 73 ms 10 72Wo07, 83Po14
240Cm ~2000 10 ps 3 76Sl01
~3000 55 ns 12 76Sl01, 78Ul01
241Cm ~2300 15.3 ns 10 69Me11, 71Br39, 72Vy07
242Cm 1900 200 40 ps 15 75Me28, 76Sl01
~2800 0.18 ms 7 71Re11, 71Br39, 73Br38
243Cm 1900 300 42 ns 6 69MeZX, 71Re11, 80Bj02
244Cm ~2200 <5 ps 69Me11, 71Re11, 80Bj02, 80Me15
~3500 >100 ns 69Me11, 80Me15, 89Ha40
245Cm 2100 300 13.2 ns 18 71Br39, 72Wo07, 80Bj02
242Bk x 9.5 ns 20 72Wo07
x+y 0.60 ms 10 72Wo07
243Bk ~2200i (?) 5 ns (?) 72Ga42, 72Vy07
244Bk x 0.82 ms 6 72Ga42, 72Wo07
245Bk ~1560 2 ns 1 71Re11, 72Ga42, 72We09
Footnotes
a Systematics of fission isomers suggest x=1600-2600; y<1000.
b %SF(236U isomer)=13 6, %SF(238U isomer)~5. For all other isomers, only SF decay has been observed.
c Rotational bands built on these states are shown in the figures.
d Deexcitation to normal states is shown in the figures.
e Some evidence for isomeric decay has been reported.
e g-factor=-0.45 3
f g-factor=0.74 5
g Q0=29.0 13 85Jo14,
i Questionable existence