List of levels for 116CS

Author: Jean Blachot | Citation: Nucl. Data Sheets 111, 717 (2010) | Cutoff date: 1-Dec-2009

Two ¹¹⁶Cs isomers have been identified from (β⁺)-delayed proton, (β⁺)-delayed α, and β⁺ decay studies. Their relative position is not known.

Delayed-p and α from ¹¹⁶Cs β⁺ decay (3.8 s):

from ¹³⁹La(p,X) E=600 MeV, ms (1978Da07,1978Ka17,1974RaZS). Measurements: T_1/2=3.5 s 2 %I(delayed-p)/I(β⁺)=0.36 8 %I(delayed-α)/I(β⁺)=8×10^-3 2 Q(ε)-s(p)(¹¹⁶Xe)=6.45 MeV 30 Q(ε)+Q(α)(¹¹⁶Xe)=12.5 MeV

from ⁹²Mo(³²S,3p5n) E=190 MeV, ms (1977Bo28,1976Bo36). Measurements: T_1/2=3.9 s 4 %I(delayed-p)/I(β⁺)=0.66 13 %I(delayed-α)/I(β⁺)|<3.3×10^-3 Q(ε)-S(p)(¹¹⁶Xe)=6.4 MeV 3

from ⁵⁸Ni,⁶³Cu(⁵⁸Ni,xpn). E=290 MeV, ms (1985Ti02) Measurement: T_1/2=4.0 s 3 I(delayed-p)/I(delayed-a)=200 80 Delayed-p and α from ¹¹⁶Cs β⁺ decay (0.7 s):

from ⁹²Mo(³²S,3p5n) E=190 MeV, ms (1977Bo28). Measurements: T_1/2=0.65 s 10 %I(delayed-p)/I(β⁺)=0.28 7 %I(delayed-α)=4.9×10^-2 25 Q(ε)+Q(α)(¹¹⁶Xe)=12.3 MeV 4

from ⁵⁸Ni,⁶³Cu(⁵⁸Ni,xpn). E=290 MeV, ms (1985Ti02,1982Ti05) Measurement: T_1/2=0.6 s 1 I(delayed-p)/I(delayed-γ)=16 4

Q-value: Note: Current evaluation has used the following Q record -7460 syst 10440 syst 700 syst 2570 syst 2003Au03,2009AuZZ

Q-value: Estimated uncertainties from 2003Au03: ΔQ-=410, ΔSN=320, ΔSP=100, ΔQA=230

Q-value: Q(εp)=6980 110 (syst,2003Au03)

E(level): From least-squares fit to Eγ’s

J^π(level): As proposed by 2006Sm04 based on angular distribution data, long cascades of stretched quadrupole transitions and systematics of neighboring Cs nuclides

M(γ): From γ-ray angular distribution data in ⁵⁸Ni(⁶⁴Zn,2pnγ). The mult=E2 corresponds to ΔJ=2 and M1⁺E2 to ΔJ=1 transitions

Q(β-)=-7.4×10³ keV SY	S(n)= 1.04×10⁴ keV SY	S(p)= 7.0×10² keV SY	Q(α)= 2.58×10³ keV SY
Reference: 2012WA38

E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
0	A	(1+)	0.70 s 4 % ε = 100 % εp = 2.8 7 % εα = 0.049 25
100 Syst.		4+,5,6	3.85 s 13 % ε = 100 % εp = 0.51 15 % εα = 0.008 2
0+X	B
191.8+X 1	B			191.8 1	100		0+X
416.9+X 2	B	(8+)		225.1 1	100		191.8+X
457+X	B
633.1+X 2	A	(10+)		176 1 ? 216.2 1 442 1 ?	7.8 16 100 5 16 5		457+X 416.9+X 191.8+X	(8+)
875.8+X 7	B	(11+)		243 1	100	M1+E2	633.1+X	(10+)
1076.3+X 2	B	(12+)		443.2 1	100	E2	633.1+X	(10+)
1318.6+X 6	B	(13+)		243 1 442.8 1	<57 100 11	M1+E2 E2	1076.3+X 875.8+X	(12+) (11+)
1726.3+X 2	B	(14+)		650.0 1	100	E2	1076.3+X	(12+)
1953.4+X 7	B	(15+)		226 1 634.8 1	42 8 100 8	M1+E2 E2	1726.3+X 1318.6+X	(14+) (13+)
2537.3+X 3	B	(16+)		811.0 2	100	E2	1726.3+X	(14+)
2727.9+X 7	B	(17+)		189 1 ? 774.5 1	38 5 100 10	E2	2537.3+X 1953.4+X	(16+) (15+)
3462.8+X 5	B	(18+)		925.5 4	100	E2	2537.3+X	(16+)
3601.0+X 7	B	(19+)		873.1 1	100	E2	2727.9+X	(17+)
4481.5+X 6	B	(20+)		1018.7 2	100	E2	3462.8+X	(18+)
4543.3+X 7	B	(21+)		942.3 1	100	E2	3601.0+X	(19+)
5480.0+X 6	B	(22+)		998.5 2	100	E2	4481.5+X	(20+)
E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
5530.0+X 7	B	(23+)		986.7 2	100	E2	4543.3+X	(21+)
6463.7+X 7	B	(24+)		983.7 4	100		5480.0+X	(22+)
6583.8+X 8	B	(25+)		1053.8 4	100		5530.0+X	(23+)
7533.1+X 8	B	(26+)		1069.4 4 ?	100		6463.7+X	(24+)
7751.6+X 9	B	(27+)		1167.8 4	100		6583.8+X	(25+)
9016.3+X 10	B	(29+)		1264.7 4 ?	100		7751.6+X	(27+)
10381.4+X 11	B	(31+)		1365.1 4 ?	100		9016.3+X	(29+)

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 1 - νh_11/2~#πh_11/2, α=0
416.9+X 2	(8+)
633.1+X 2	(10+)
1076.3+X 2	(12+)
1726.3+X 2	(14+)		650.0 1	100	E2	1076.3+X	(12+)
2537.3+X 3	(16+)		811.0 2	100	E2	1726.3+X	(14+)
3462.8+X 5	(18+)
4481.5+X 6	(20+)		1018.7 2	100	E2	3462.8+X	(18+)
5480.0+X 6	(22+)		998.5 2	100	E2	4481.5+X	(20+)
6463.7+X 7	(24+)		983.7 4	100		5480.0+X	(22+)
7533.1+X 8	(26+)		1069.4 4 ?	100		6463.7+X	(24+)
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 2 - νh_11/2~#πh_11/2, α=1
875.8+X 7	(11+)
1318.6+X 6	(13+)
1953.4+X 7	(15+)
2727.9+X 7	(17+)		189 1 ? 774.5 1	38 5 100 10	E2	2537.3+X 1953.4+X	(16+) (15+)
3601.0+X 7	(19+)		873.1 1	100	E2	2727.9+X	(17+)
4543.3+X 7	(21+)
5530.0+X 7	(23+)		986.7 2	100	E2	4543.3+X	(21+)
6583.8+X 8	(25+)		1053.8 4	100		5530.0+X	(23+)
7751.6+X 9	(27+)		1167.8 4	100		6583.8+X	(25+)
9016.3+X 10	(29+)		1264.7 4 ?	100		7751.6+X	(27+)
10381.4+X 11	(31+)		1365.1 4 ?	100		9016.3+X	(29+)

E(level)	J^π(level)	T_1/2(level)	Comments
0	(1+)	0.70 s 4 % ε = 100 % εp = 2.8 7 % εα = 0.049 25	Decay branches taken from 2003Au02 evaluation.
100	4+,5,6	3.85 s 13 % ε = 100 % εp = 0.51 15 % εα = 0.008 2	Decay branches taken from 2003Au02 evaluation.
416.9+X	(8+)		E(level): νh_11/2~#πh_11/2, α=0.
633.1+X	(10+)		E(level): νh_11/2~#πh_11/2, α=0.
875.8+X	(11+)		E(level): νh_11/2~#πh_11/2, α=1.
1076.3+X	(12+)		E(level): νh_11/2~#πh_11/2, α=0.
1318.6+X	(13+)		E(level): νh_11/2~#πh_11/2, α=1.
1726.3+X	(14+)		E(level): νh_11/2~#πh_11/2, α=0.
1953.4+X	(15+)		E(level): νh_11/2~#πh_11/2, α=1.
2537.3+X	(16+)		E(level): νh_11/2~#πh_11/2, α=0.
2727.9+X	(17+)		E(level): νh_11/2~#πh_11/2, α=1.
3462.8+X	(18+)		E(level): νh_11/2~#πh_11/2, α=0.
3601.0+X	(19+)		E(level): νh_11/2~#πh_11/2, α=1.
4481.5+X	(20+)		E(level): νh_11/2~#πh_11/2, α=0.
4543.3+X	(21+)		E(level): νh_11/2~#πh_11/2, α=1.
5480.0+X	(22+)		E(level): νh_11/2~#πh_11/2, α=0.
5530.0+X	(23+)		E(level): νh_11/2~#πh_11/2, α=1.
6463.7+X	(24+)		E(level): νh_11/2~#πh_11/2, α=0.
6583.8+X	(25+)		E(level): νh_11/2~#πh_11/2, α=1.
7533.1+X	(26+)		E(level): νh_11/2~#πh_11/2, α=0.
7751.6+X	(27+)		E(level): νh_11/2~#πh_11/2, α=1.
9016.3+X	(29+)		E(level): νh_11/2~#πh_11/2, α=1.
10381.4+X	(31+)		E(level): νh_11/2~#πh_11/2, α=1.

E(level)	E(gamma)	Comments
191.8+X	191.8	M(γ): stretched Q suggested by γ-ray angular distribution
416.9+X	225.1	M(γ): stretched Q or unstretched mixed D+Q
875.8+X	243	E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity
1318.6+X	243	E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity

References:
A	¹¹⁶Ba ε decay (1.3 S)	B	⁵⁸Ni(⁶⁴Zn,APNG)