List of levels for 148LA

Author: N. Nica | Citation: Nucl. Data Sheets 208, 1 (2026) | Cutoff date: 17-Jan-2026

Levels: The bands observed in ¹⁴⁸La are interpreted as aligned coupling of [πh_11/2νh_9/2]_{low spin} to the deformed core rotor. (²⁵²Cf SF decay dataset, 2009Lu11)

Q-value: S(2n)=9630 20, S(2p)=21976 20, Q(β^-n)=1234 21 (2021Wa16)

E(level): From a least-squares fit to Eγ data, with reduced χ²=6.65> critical χ²=1.57. This fact is due to Eγ’s from ¹⁴⁸Ba β^- decay dataset, reported with higher than realistic precision

J^π(level): For levels assigned in either band, assumed by 2009Lu11 (SF decay) based on the rotational character of this nucleus

I(γ): Relative photon branching from each level

M(γ): Based on α(K)exp measurements from γ’s from ¹⁴⁸Ba β^- decay and on α(exp) measurements for γ’s from ²⁵²Cf SF decay

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ) (keV)	Multipolarity	Conversion Coefficient	Additional Data
47.21	(1-,2-)		47.22 4	(M1)	9.47	α=9.47 13, α(K)=8.07 11, α(L)=1.109 16, α(M)=0.2307 33, α(N)=0.0507 7, α(O)=0.00822 12, α(P)=0.000633 9
56.034	(1+)	67 ns 4	56.08 4	E1	1.140	B(E1)(W.u.)=9.6E-6 6, α=1.140 16, α(K)=0.959 14, α(L)=0.1436 20, α(M)=0.0297 4, α(N)=0.00637 9, α(O)=0.000971 14, α(P)=5.41E-5 8
61.44	(-)		61.48 4	M1,E2	8	α=8 4, α(K)=4.1 4, α(L)=3.1 26, α(M)=0.7 6, α(N)=0.15 12, α(O)=0.021 17, α(P)=0.000262 31
109.89	(1+)		48.44 4	E1	1.682	α=1.682 24, α(K)=1.408 20, α(L)=0.2180 31, α(M)=0.0451 6, α(N)=0.00965 14, α(O)=0.001458 21, α(P)=7.79×10^-5 11
109.89	(1+)		53.81 4	M1,E2	13	α=13 7, α(K)=5.66 16, α(L)=6 5, α(M)=1.3 11, α(N)=0.27 24, α(O)=0.038 32, α(P)=0.00037 6
133.668	(-)		86.44 4	M1,E2	2.5	α=2.5 9, α(K)=1.63 23, α(L)=0.7 5, α(M)=0.15 11, α(N)=0.032 23, α(O)=0.0046 32, α(P)=0.000104 6
133.668	(-)		133.53 4	E2,M1	0.60	α=0.60 12, α(K)=0.45 5, α(L)=0.11 6, α(M)=0.025 13, α(N)=0.0053 27, α(O)=8.E-4 4, α(P)=3.01E-5 17
140.92	(2+)		84.7 3	M1	1.740	α=1.740 30, α(K)=1.485 26, α(L)=0.2018 35, α(M)=0.0420 7, α(N)=0.00922 16, α(O)=0.001498 26, α(P)=0.0001158 20
282.2	(3+)		141.3 3	M1+E2	0.50	α=0.50 9, α(K)=0.382 35, α(L)=0.09 4, α(M)=0.020 10, α(N)=0.0042 21, α(O)=6.3×10^-4 28, α(P)=2.56E-5 15

Q(β-)=7690 keV 22	S(n)= 4102 keV 22	S(p)= 9734 keV 28	Q(α)= -1862 keV 28
Reference: 2021WA16

E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
0.0	A C	(2-)	1.34 s 7 % β^- = 100 % β^-n = 0.19 5
47.21 3	A	(1-,2-)		47.22 4	100	(M1)	0.0	(2-)
56.034 25	A C	(1+)	67 ns 4	56.08 4	100	E1	0.0	(2-)
61.44 3	A	(-)		61.48 4	100	M1,E2	0.0	(2-)
109.89 3	A	(1+)		48.44 4 53.81 4 109.87 5	58.2 10 100 2 23.5 21	E1 M1,E2	61.44 56.034 0.0	(-) (1+) (2-)
133.668 24	A	(-)		72.20 5 86.44 4 133.53 4	50 5 51.9 23 100.0 15	M1,E2 E2,M1	61.44 47.21 0.0	(-) (1-,2-) (2-)
140.92 22	C	(2+)		84.7 3 141.1 3	100 20.2	M1	56.034 0.0	(1+) (2-)
154.49 4	A			44.43 6 98.5 2 107.32 5	7.1 10 100 21 15.2 20		109.89 56.034 47.21	(1+) (1+) (1-,2-)
159.42 6	A			49.65 8 98.1 2	19 4 100 23		109.89 61.44	(1+) (-)
168.71 4	A			112.73 5 168.68 5	32.6 22 100 7		56.034 0.0	(1+) (2-)
201.26 5	A			46.30 6 145.48 5	3.3 17 100 3		154.49 56.034	(1+)
217.86 4	A			58.52 6 84.02 5 156.42 6 218.30 10	18.0 17 100 8 82 5 20 5		159.42 133.668 61.44 0.0	(-) (-) (2-)
230.46 5	A			96.58 6 120.95 20 174.55 5	66 7 100 20 97 10		133.668 109.89 56.034	(-) (1+) (1+)
E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
261.08 5	A			92.40 5 127.38 6	100 4 62 8		168.71 133.668	(-)
282.2 4	C	(3+)		141.3 3	100	M1+E2	140.92	(2+)
287.08 5	A			153.39 8 177.06 6	50 8 100 8		133.668 109.89	(-) (1+)
338.80 10	A			205.13 9	100		133.668	(-)
350.6 4	C	(4+)		68.4 3 209.7 3	18.9 100		282.2 140.92	(3+) (2+)
363.85 7	A			230.37 17 307.79 6	21 18 100 6		133.668 56.034	(-) (1+)
369.23 4	A			214.96 5 235.62 6 259.37 5 312.76 6	100 4 45.0 25 69 4 40 6		154.49 133.668 109.89 56.034	(-) (1+) (1+)
401.15 7	A			246.66 6 345.1 2	100 10 20 5		154.49 56.034	(1+)
441.7 4	C	(5+)		91.1 3 159.5 3	53.6 100		350.6 282.2	(4+) (3+)
471.89 5	A			270.25 12 317.63 20 410.65 7 415.78 6	41 4 18 3 42 2 100.0 25		201.26 154.49 61.44 56.034	(-) (1+)
500.22 5	A			212.95 7 390.3 2 444.28 5	29 3 18 10 100 4		287.08 109.89 56.034	(1+) (1+)
538.08 11	A			369.3 2 404.46 14 476.6 2	23 9 100 9 95 36		168.71 133.668 61.44	(-) (-)
554.13 11	A			185.0 2 323.63 12	46 27 100 8		369.23 230.46
E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
663.0 4	C	(6+)		221.3 3 312.4 3	13.9 100		441.7 350.6	(5+) (4+)
708.2 5	C	(7+)		266.5 3	100		441.7	(5+)
717.22 9	A			583.6 2 607.33 11 661.1 2	10 3 100 8 14 5		133.668 109.89 56.034	(-) (1+) (1+)
830.67 11	A			569.6 2 600.2 2 720.8 2 774.6 2	68 32 100 36 95 36 27 14		261.08 230.46 109.89 56.034	(1+) (1+)
1060.1 5	C	(8+)		351.9 3 ? 397.1 3	<4 100		708.2 663.0	(7+) (6+)
1101.8 6	C	(9+)		393.6 3	100		708.2	(7+)
1229.04 10	A			757.15 13 1011.2 2 1173.0 2	74 32 100 42 63 42		471.89 217.86 56.034	(1+)
1252.47 7	A			535.2 2 1118.82 7 1196.3 2	18 10 100 5 41 13		717.22 133.668 56.034	(-) (1+)
1495.9 6	C	(10+)		435.8 3	100		1060.1	(8+)
1612.4 7	C	(11+)		510.6 3	100		1101.8	(9+)
1980.0 7	C	(12+)		484.1 3	100		1495.9	(10+)
2226.0 7	C	(13+)		613.6 3	100		1612.4	(11+)

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 1 - Band based on (2⁺), α=0. Upbend at h\|w≈0.2 MeV.
140.92 22	(2+)
350.6 4	(4+)		68.4 3 209.7 3	18.9 100		282.2 140.92	(3+) (2+)
663.0 4	(6+)		221.3 3 312.4 3	13.9 100		441.7 350.6	(5+) (4+)
1060.1 5	(8+)		351.9 3 ? 397.1 3	<4 100		708.2 663.0	(7+) (6+)
1495.9 6	(10+)		435.8 3	100		1060.1	(8+)
1980.0 7	(12+)		484.1 3	100		1495.9	(10+)
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 2 - Band based on (3⁺), α=1
282.2 4	(3+)
441.7 4	(5+)		91.1 3 159.5 3	53.6 100		350.6 282.2	(4+) (3+)
708.2 5	(7+)		266.5 3	100		441.7	(5+)
1101.8 6	(9+)		393.6 3	100		708.2	(7+)
1612.4 7	(11+)		510.6 3	100		1101.8	(9+)
2226.0 7	(13+)		613.6 3	100		1612.4	(11+)

E(level)	J^π(level)	T_1/2(level)	Comments
56.034	(1+)	67 ns 4	J=1⁺ from log ft=4.9 via 0⁺ parent in β^- decay (1984Ch02); parentheses on adopted Jπ indicate uncertainty in β^- branching estimates. E(level): J=1⁺ from log ft=4.9 via 0⁺ parent in β^- decay (1984Ch02); parentheses on adopted Jπ indicate uncertainty in β^- branching estimates.
109.89	(1+)		J=1⁺ from log ft=5.0 limit via 0⁺ parent in β^- decay; parentheses on adopted Jπ indicate uncertainty in β^- branching estimates. E(level): J=1⁺ from log ft=5.0 limit via 0⁺ parent in β^- decay; parentheses on adopted Jπ indicate uncertainty in β^- branching estimates.
140.92	(2+)		E(level): Band based on (2⁺), α=0. Upbend at h\|w≈0.2 MeV.
282.2	(3+)		E(level): Band based on (3⁺), α=1.
350.6	(4+)		E(level): Band based on (2⁺), α=0. Upbend at h\|w≈0.2 MeV.
441.7	(5+)		E(level): Band based on (3⁺), α=1.
663.0	(6+)		E(level): Band based on (2⁺), α=0. Upbend at h\|w≈0.2 MeV.
708.2	(7+)		E(level): Band based on (3⁺), α=1.
1060.1	(8+)		E(level): Band based on (2⁺), α=0. Upbend at h\|w≈0.2 MeV.
1101.8	(9+)		E(level): Band based on (3⁺), α=1.
1495.9	(10+)		E(level): Band based on (2⁺), α=0. Upbend at h\|w≈0.2 MeV.
1612.4	(11+)		E(level): Band based on (3⁺), α=1.
1980.0	(12+)		E(level): Band based on (2⁺), α=0. Upbend at h\|w≈0.2 MeV.
2226.0	(13+)		E(level): Band based on (3⁺), α=1.

E(level)	E(gamma)	Comments
133.668	133.53	E(γ): Differs by 3σ or more from the value calculated from the energy difference of initial and final levels
140.92	84.7	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay M(γ): from α(exp)=1.51 49 (2009Lu11)
140.92	141.1	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay
154.49	44.43	E(γ): Differs by 3σ or more from the value calculated from the energy difference of initial and final levels
201.26	46.30	E(γ): Differs by 3σ or more from the value calculated from the energy difference of initial and final levels
201.26	145.48	E(γ): Differs by 3σ or more from the value calculated from the energy difference of initial and final levels
217.86	84.02	E(γ): Differs by 3σ or more from the value calculated from the energy difference of initial and final levels
217.86	218.30	E(γ): Differs by 3σ or more from the value calculated from the energy difference of initial and final levels
230.46	96.58	E(γ): Differs by 3σ or more from the value calculated from the energy difference of initial and final levels
282.2	141.3	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay M(γ): from α(exp)=0.54 18 (2009Lu11)
350.6	68.4	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay
350.6	209.7	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay
369.23	214.96	E(γ): Differs by 3σ or more from the value calculated from the energy difference of initial and final levels
369.23	312.76	E(γ): Differs by 3σ or more from the value calculated from the energy difference of initial and final levels
441.7	91.1	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay
441.7	159.5	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay
471.89	270.25	E(γ): Differs by 3σ or more from the value calculated from the energy difference of initial and final levels
471.89	410.65	E(γ): Differs by 3σ or more from the value calculated from the energy difference of initial and final levels
500.22	212.95	E(γ): Differs by 3σ or more from the value calculated from the energy difference of initial and final levels
663.0	221.3	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay
663.0	312.4	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay
708.2	266.5	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay
1060.1	351.9	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay
1060.1	397.1	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay
1101.8	393.6	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay
E(level)	E(gamma)	Comments
1495.9	435.8	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay
1612.4	510.6	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay
1980.0	484.1	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay
2226.0	613.6	E(γ): From ²⁵²Cf SF decay I(γ): From ²⁵²Cf SF decay

References:
A	¹⁴⁸Ba β^- decay	B	¹⁴⁹Ba β^-n decay (0.344 S)
C	²⁵²Cf SF decay