List of levels for 169IR

Author: M. Shamsuzzoha Basunia | Citation: Nucl. Data Sheets 209, 1 (2026) | Cutoff date: 1-Oct-2025

Identification: excitation functions for ⁶³Cu bombardments of cadmium, silver, and palladium (1978Ca11); excitation functions for krypton bombardments of niobium and yttrium (1978Sc26).

Q-value: ΔQ(β^-)=200 (syst,2021Wa16)

Q-value: S(2n)=21164 30, S(2p)=1840 50 (syst), Q(εp)=6410 40 (2021Wa16)

E(level): From least-squares fit to Eγ, excluding the 152.3 and 393.3 γs from 1724.64 keV level and 317.6γ from 2319.0 keV level - fit very poorly. Energies are given assuming E=153 for the h_11/2 isomeric state and without considering the 24 keV uncertainty in that energy.

J^π(level): Based on band structure deduced in (⁶⁰Ni,p2nγ), transition multipolarities and similarity of level scheme to that for ¹⁷¹Ir, except where otherwise noted.

M(γ): From ¹¹²Sn(⁶⁰Ni,p2nγ) based on measured (Iγ(158|’))/(Iγ(86|’)+Iγ(94|’)) and assigning Δπ=(no) to intraband transitions.

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ) (keV)	Multipolarity	Conversion Coefficient	Additional Data
610.08	(13/2-)		457.1 2	(M1)	0.0910	α=0.0910 13, α(K)=0.0754 11, α(L)=0.01203 17, α(M)=0.00276 4, α(N)=0.000679 10, α(O)=0.0001205 17, α(P)=9.15×10^-6 13
811.35	(15/2-)		201.7 3	(M1)	0.838	α=0.838 12, α(K)=0.692 10, α(L)=0.1126 16, α(M)=0.0259 4, α(N)=0.00637 9, α(O)=0.001129 16, α(P)=8.52×10^-5 12
811.35	(15/2-)		658.3 3	(E2)	0.01250	α=0.01250 18, α(K)=0.00976 14, α(L)=0.002101 30, α(M)=0.000499 7, α(N)=0.0001219 17, α(O)=2.065×10^-5 29, α(P)=1.111E-6 16
1330.69	(17/2-)		519.3 4	(M1)	0.0651	α=0.0651 9, α(K)=0.0540 8, α(L)=0.00858 12, α(M)=0.001969 28, α(N)=0.000484 7, α(O)=8.59×10^-5 12, α(P)=6.53E-6 9
1330.69	(17/2-)		720.3 2	(E2)	0.01026	α=0.01026 14, α(K)=0.00810 11, α(L)=0.001657 23, α(M)=0.000391 5, α(N)=9.57×10^-5 13, α(O)=1.631E-5 23, α(P)=9.23E-7 13
1573.49	(19/2-)		762.4 4	(E2)	0.00909	α=0.00909 13, α(K)=0.00722 10, α(L)=0.001433 20, α(M)=0.000338 5, α(N)=8.26×10^-5 12, α(O)=1.412E-5 20, α(P)=8.23E-7 12
2116.24	(21/2-)		785.3 2	(E2)	0.00854	α=0.00854 12, α(K)=0.00680 10, α(L)=0.001331 19, α(M)=0.000313 4, α(N)=7.66×10^-5 11, α(O)=1.311E-5 18, α(P)=7.75E-7 11

Q(β-)=-9630 keV SY	S(n)= 11500 keV 60	S(p)= -613 keV 22	Q(α)= 6141 keV 4
Reference: 2021WA16

References:
A	¹⁷³Au α decay (25.5 MS)	B	¹⁷³Au α decay (12.2 MS)
C	¹¹²Sn(⁶⁰Ni,p2nγ)

E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
0.0	A C	(1/2+)	0.570 s 30 % p = ? % α = 56 9 % ε = ?
153 24	B C	(11/2-)	0.280 s 1 % p = ? % α = 79 6 % ε = ?
610.08 18	C	(13/2-)		457.1 2	100	(M1)	153	(11/2-)
811.35 21	C	(15/2-)		201.7 3 658.3 3	31.5 8 100.0 13	(M1) (E2)	610.08 153	(13/2-) (11/2-)
1243.18 27	C	(15/2-)		633.1 2	100		610.08	(13/2-)
1330.69 23	C	(17/2-)		519.3 4 720.3 2	100.0 21 63.5 19	(M1) (E2)	811.35 610.08	(15/2-) (13/2-)
1547.07 28	C	(17/2-)		937.3 3	100		610.08	(13/2-)
1573.49 25	C	(19/2-)		242.5 4 762.4 4	<58 100.0 21	(E2)	1330.69 811.35	(17/2-) (15/2-)
1724.73 33	C	(19/2-)		152.3 1 178.0 3 393.3 1	58.0 17 29.5 12 100.0 22	D	1573.49 1547.07 1330.69	(19/2-) (17/2-) (17/2-)
1803.08 33	C	(17/2-)		559.9 2	100		1243.18	(15/2-)
1803.73 25	C	(19/2-)		256.6 4 992.5 2	100 3 35.4 21		1547.07 811.35	(17/2-) (15/2-)
1998.29 31	C	(21/2-)		273.9 3	100		1724.73	(19/2-)
2045.51 35	C	(21/2-)		242.5 4	100		1803.73	(19/2-)
2116.24 25	C	(21/2-)		542.8 1 785.3 2	100 10 83 6	(E2)	1573.49 1330.69	(19/2-) (17/2-)
2221.9 4	C	(23/2-)		223.6 2	100		1998.29	(21/2-)
2261.93 26	C	(21/2-)		263.8 2 688.4 1	24.7 26 100 3		1998.29 1573.49	(21/2-) (19/2-)
E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
2263.93 35	C	(23/2-)		539.2 1	100		1724.73	(19/2-)
2319.00 28	C	(23/2-)		273.9 3 317.6 4 515.1 3 745.4 2	<260 100 3 24 9 51 3		2045.51 1998.29 1803.73 1573.49	(21/2-) (21/2-) (19/2-) (19/2-)
2406.90 35	C	(23/2-)		290.6 3 833.5 4	<18 100 5		2116.24 1573.49	(21/2-) (19/2-)
2449.50 30	C	(25/2-)		130.5 1	100		2319.00	(23/2-)
2468.43 28	C	(23/2-)		206.5 1	100		2261.93	(21/2-)
2574.5 4	C	(25/2-)		310.6 2	100		2263.93	(23/2-)
2609.0 4	C	(27/2-)		159.5 2	100		2449.50	(25/2-)
2852.14 35	C	(25/2-)		383.7 2	100		2468.43	(23/2-)
2861.9 7	C	(29/2-)		252.9 6	100		2609.0	(27/2-)
3118.5 8	C	(31/2-)		256.6 4	100		2861.9	(29/2-)
3442.1 8	C	(33/2-)		323.6 2	100		3118.5	(31/2-)

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 1 - π 11/2[505], α=+1/2 band. Configuration supported by
610.08 18	(13/2-)
1330.69 23	(17/2-)
2116.24 25	(21/2-)		542.8 1 785.3 2	100 10 83 6	(E2)	1573.49 1330.69	(19/2-) (17/2-)
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 2 - π 11/2[505], α=-1/2 band. See comment on signature partner
811.35 21	(15/2-)
1573.49 25	(19/2-)
2406.90 35	(23/2-)		290.6 3 833.5 4	<18 100 5		2116.24 1573.49	(21/2-) (19/2-)
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 3 - π=(-) sideband 1. Based on (17/2-).
1547.07 28	(17/2-)
1724.73 33	(19/2-)
1998.29 31	(21/2-)		273.9 3	100		1724.73	(19/2-)
2221.9 4	(23/2-)		223.6 2	100		1998.29	(21/2-)
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 4 - π=(-) sideband 2. Based on (23/2-).
2319.00 28	(23/2-)
2449.50 30	(25/2-)
2609.0 4	(27/2-)		159.5 2	100		2449.50	(25/2-)
2861.9 7	(29/2-)		252.9 6	100		2609.0	(27/2-)
3118.5 8	(31/2-)		256.6 4	100		2861.9	(29/2-)
3442.1 8	(33/2-)		323.6 2	100		3118.5	(31/2-)

E(level)	J^π(level)	T_1/2(level)	Comments
0.0	(1/2+)	0.570 s 30 % p = ? % α = 56 9 % ε = ?	%α: weighted average of 57 9 (2012Th13) and 50 18 (1999Po09). Other: 42 15 (2005Sc22). E(level): %α: weighted average of 57 9 (2012Th13) and 50 18 (1999Po09). Other: 42 15 (2005Sc22).
610.08	(13/2-)		E(level): π 11/2[505], α=+1/2 band. Configuration supported by.
811.35	(15/2-)		E(level): π 11/2[505], α=-1/2 band. See comment on signature partner.
1330.69	(17/2-)		E(level): π 11/2[505], α=+1/2 band. Configuration supported by.
1547.07	(17/2-)		E(level): π=(-) sideband 1. Based on (17/2-).
1573.49	(19/2-)		E(level): π 11/2[505], α=-1/2 band. See comment on signature partner.
1724.73	(19/2-)		E(level): π=(-) sideband 1. Based on (17/2-).
1998.29	(21/2-)		E(level): π=(-) sideband 1. Based on (17/2-).
2116.24	(21/2-)		E(level): π 11/2[505], α=+1/2 band. Configuration supported by.
2221.9	(23/2-)		E(level): π=(-) sideband 1. Based on (17/2-).
2319.00	(23/2-)		E(level): π=(-) sideband 2. Based on (23/2-).
2406.90	(23/2-)		E(level): π 11/2[505], α=-1/2 band. See comment on signature partner.
2449.50	(25/2-)		E(level): π=(-) sideband 2. Based on (23/2-).
2609.0	(27/2-)		E(level): π=(-) sideband 2. Based on (23/2-).
2861.9	(29/2-)		E(level): π=(-) sideband 2. Based on (23/2-).
3118.5	(31/2-)		E(level): π=(-) sideband 2. Based on (23/2-).
3442.1	(33/2-)		E(level): π=(-) sideband 2. Based on (23/2-).

E(level)	E(gamma)	Comments
1573.49	242.5	E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity
1724.73	152.3	E(γ): very poor fit and omitted in the fitting; level-energy difference=151.24. Very Poor fit and omitted in the fitting
1724.73	393.3	E(γ): very poor fit and omitted in the fitting; level-energy difference=394.04. Very Poor fit and omitted in the fitting
1803.73	256.6	E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity
1998.29	273.9	E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity
2045.51	242.5	E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity
2319.00	273.9	E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity
2319.00	317.6	E(γ): very poor fit and omitted in the fitting; level-energy difference=320.72. fits placement very poorly; Eγ is >5σ from expected value. Level energy difference is 320.7 3.. Very Poor fit and omitted in the fitting
3118.5	256.6	E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity