List of levels for 159SM

Author: C. W. Reich | Citation: Nucl. Data Sheets 113, 157 (2012) | Cutoff date: 31-Dec-2010

1986Ma12: ¹⁵⁹Sm produced and identified in ²³⁵U(n,F), followed by mass separation of fission fragments at the TRISTAN facility of Brookhaven National Laboratory. Measured half-life of the decay of ¹⁵⁹Sm and two γ rays of 114 and 190 keV.

1987Wi14 (also 1986GrZX,1987Gr12,1988GrZY,1990An31): ¹⁵⁹Sm produced and identified in SF decay of ²⁵²Cf, followed by online mass separation of fission fragments. Measured Eγ, Iγ for 16 γ rays.

2012Va02: measured mass of the g.s. from cyclotron frequency ratios using the Canadian Penning Trap mass spectrometer at the CARIBU-ANL facility.

Theoretical structure calculations:

2022An05: calculated charge radii and odd-even staggering (OES) effects using the relativistic mean field (RMF-BCS) and the modified RMF(BCS) approaches.

2020Li53: calculated energy levels, Jπ, ground-state band, moments of inertia, bandhead energy of isomeric state using modified Nilsson parameters to generate deformed bases for the projected shell model.

2015El05: calculated ground state energy, S(2n) using HFB method with SLy5 Skyrme and Gogny forces.

1984Al30: calculated quadrupole and hexadecapole moments, g.s. energy.

Q-value: S(2n)=11673 7, S(2p)=20292 6 (2021Wa16)

E(level): From least-squares fit to Eγ data, assuming ΔEγ=0.5 keV or 1 keV, when not states, the former when Eγ stated to nearest tenth of a keV, the latter when stated to nearest keV

J^π(level): Based on the observed γ-decay patterns and expected band structure.

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ) (keV)	Multipolarity	Conversion Coefficient	Additional Data
71.8	(7/2-)		71.8	[M1+E2]	6.2	α=6.2 19
163.1	(9/2-)		163.1 9	[E2]	0.417	α=0.417 10
406.3	(13/2-)		243.2 7	[E2]	0.1095	α=0.1095 19
727.3	(17/2-)		321.0	[E2]	0.0456	α=0.0456 7
1123.2	(21/2-)		395.9	[E2]	0.0245	α=0.0245 4
1275.9	(11/2-)	115 ns 10 % IT = 100	869.6 8	[M1+E2]	0.0044	α=0.0044 11

Q(β-)=3836 keV 7	S(n)= 5027 keV 8	S(p)= 10391 keV 6	Q(α)= -2349 keV 11
Reference: 2021WA16

References:
A	¹⁵⁹Pm β^- decay (1.634 S)	B	¹⁵⁹Sm IT decay (115 NS)
C	²⁵²Cf SF decay

E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
0.0	A B C	5/2-	11.37 s 15 % β^- = 100
71.8 5	A	(7/2-)		71.8	100	[M1+E2]	0.0	5/2-
163.1 9	C	(9/2-)		163.1 9	100	[E2]	0.0	5/2-
406.3 12	C	(13/2-)		243.2 7	100	[E2]	163.1	(9/2-)
727.3 13	C	(17/2-)		321.0		[E2]	406.3	(13/2-)
1123.2 14	C	(21/2-)		395.9		[E2]	727.3	(17/2-)
1275.9 14	C	(11/2-)	115 ns 10 % IT = 100	869.6 8	100	[M1+E2]	406.3	(13/2-)
1418.9 15	C	(13/2-)		142.7			1275.9	(11/2-)
1578.3 15	C	(15/2-)		159.2 302.7	330 70 100		1418.9 1275.9	(13/2-) (11/2-)
1591.3 15	C	(25/2-)		468.1			1123.2	(21/2-)
1754.0 15	C	(17/2-)		175.8 335.1	210 40 100		1578.3 1418.9	(15/2-) (13/2-)
1946.0 15	C	(19/2-)		191.8 367.5			1754.0 1578.3	(17/2-) (15/2-)
2128.0 16	C	(29/2-)		536.7			1591.3	(25/2-)
2154.2 15	C	(21/2-)		207.9 400.5			1946.0 1754.0	(19/2-) (17/2-)
2378.0 16	C	(23/2-)		223.9 432.0			2154.2 1946.0	(21/2-) (19/2-)
2616.6 16	C	(25/2-)		238.5 462.4			2378.0 2154.2	(23/2-) (21/2-)
2871.9 16	C	(27/2-)		255 494.0			2616.6 2378.0	(25/2-) (23/2-)
3141.7 17	C	(29/2-)		270 525			2871.9 2616.6	(27/2-) (25/2-)

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 1 - ν5/2[523].
0.0	5/2-	11.37 s 15 % β^- = 100
71.8 5	(7/2-)		71.8	100	[M1+E2]	0.0	5/2-
163.1 9	(9/2-)		163.1 9	100	[E2]	0.0	5/2-
406.3 12	(13/2-)		243.2 7	100	[E2]	163.1	(9/2-)
727.3 13	(17/2-)		321.0		[E2]	406.3	(13/2-)
1123.2 14	(21/2-)		395.9		[E2]	727.3	(17/2-)
1591.3 15	(25/2-)		468.1			1123.2	(21/2-)
2128.0 16	(29/2-)		536.7			1591.3	(25/2-)
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 2 - ν11/2[505],α=+1/2.
1418.9 15	(13/2-)
1754.0 15	(17/2-)		175.8 335.1	210 40 100		1578.3 1418.9	(15/2-) (13/2-)
2154.2 15	(21/2-)		207.9 400.5			1946.0 1754.0	(19/2-) (17/2-)
2616.6 16	(25/2-)		238.5 462.4			2378.0 2154.2	(23/2-) (21/2-)
3141.7 17	(29/2-)		270 525			2871.9 2616.6	(27/2-) (25/2-)
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 3 - ν11/2[505],α=-1/2.
1275.9 14	(11/2-)	115 ns 10 % IT = 100
1578.3 15	(15/2-)		159.2 302.7	330 70 100		1418.9 1275.9	(13/2-) (11/2-)
1946.0 15	(19/2-)		191.8 367.5			1754.0 1578.3	(17/2-) (15/2-)
2378.0 16	(23/2-)		223.9 432.0			2154.2 1946.0	(21/2-) (19/2-)
2871.9 16	(27/2-)		255 494.0			2616.6 2378.0	(25/2-) (23/2-)

E(level)	J^π(level)	T_1/2(level)	Comments
0.0	5/2-	11.37 s 15 % β^- = 100	E(level): ν5/2[523].
71.8	(7/2-)		E(level): ν5/2[523].
163.1	(9/2-)		E(level): ν5/2[523].
406.3	(13/2-)		E(level): ν5/2[523].
727.3	(17/2-)		E(level): ν5/2[523].
1123.2	(21/2-)		E(level): ν5/2[523].
1275.9	(11/2-)	115 ns 10 % IT = 100	E(level): ν11/2[505],α=-1/2.
1418.9	(13/2-)		E(level): ν11/2[505],α=+1/2.
1578.3	(15/2-)		E(level): ν11/2[505],α=-1/2.
1591.3	(25/2-)		E(level): ν5/2[523].
1754.0	(17/2-)		E(level): ν11/2[505],α=+1/2.
1946.0	(19/2-)		E(level): ν11/2[505],α=-1/2.
2128.0	(29/2-)		E(level): ν5/2[523].
2154.2	(21/2-)		E(level): ν11/2[505],α=+1/2.
2378.0	(23/2-)		E(level): ν11/2[505],α=-1/2.
2616.6	(25/2-)		E(level): ν11/2[505],α=+1/2.
2871.9	(27/2-)		E(level): ν11/2[505],α=-1/2.
3141.7	(29/2-)		E(level): ν11/2[505],α=+1/2.

E(level)	E(gamma)	Comments
71.8	71.8	E(γ): from ¹⁵⁹Pm β^- decay
163.1	163.1	E(γ): From ¹⁵⁹Sm IT decay I(γ): From ¹⁵⁹Sm IT decay
406.3	243.2	E(γ): From ¹⁵⁹Sm IT decay I(γ): From ¹⁵⁹Sm IT decay
1275.9	869.6	E(γ): From ¹⁵⁹Sm IT decay I(γ): From ¹⁵⁹Sm IT decay
1578.3	302.7	E(γ): Level-energy difference=301.8