List of levels for 50CA

ADOPTED LEVELS, GAMMAS for ⁵⁰Ca

Authors: Jun Chen and Balraj Singh | Citation: Nucl. Data Sheets 157, 1 (2019) | Cutoff date: 15-Apr-2019

Full ENSDF file | Adopted Levels (PDF version)

Q(β-)=4958 keV 15	S(n)= 6360.8 keV 16	S(p)= 17266.7 keV 18	Q(α)= -12241.2 keV 19
Reference: 2017WA10

References:
A	⁵⁰K β^- decay (472 MS)	B	⁵¹K β^-n decay (365 MS)
C	⁵²K β^-2n decay (110 MS)	D	¹H(⁵⁰Ca,p’γ)
E	⁴⁸Ca(t,p),(pol t,p)	F	⁴⁸Ca(α,2p)
G	⁴⁸Ca(²³⁸U,xγ)	H	²⁰⁸Pb(⁴⁸Ca,xγ)
I	²³⁸U(⁴⁸Ca,xγ)

Mass measurement: 2012La05 (tof-ICR resonance frequency ratios using TITAN Penning trap spectrometer at TRIUMF-ISAC facility).

Theory references: consult the NSR database (www.nndc.bnl.gov/nsr/) for 125 primary references for structure calculations.

Q-value: S(2n)=11507.2 16, S(2p)=31890 310 (2017Wa10)

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 D E F G H I	0+	13.45 s 5 % β^- = 100
1026.72 10	A B C D E F G H I	2+	66.5 ps 21	1026.7 1	100	E2	0.0	0+
3002.1 5	A B D E F G H	(2+)	< 0.69 ps	1975.3 5	100	(D)	1026.72	2+
3531.7 4	A B E	(1,2+)		2504.5 8 3531.7 4	100 13 92 13		1026.72 0.0	2+ 0+
3997.22 21	D E F G H I	(3-)	< 0.69 ps	2970.3 3	100	D	1026.72	2+
4035.7 4	A B D	(1,2+)		3008.8 5 4035.6 5	60 4 100 6		1026.72 0.0	2+ 0+
4475.8 5	A E	(0+)		3449.0 5	100		1026.72	2+
4515.04 14	D E G H I	(4+)	< 1.04 ps	518.4 7 3488.2 1	2 1 100	(E2)	3997.22 1026.72	(3-) 2+
4830.6 3	E G H I	(4)	< 0.69 ps	833.4 2	100	(D)	3997.22	(3-)
4870 5	G	(2+)		4870 5			0.0	0+
4886.3 5	A E	(1-)		4886.0 5	100		0.0	0+
4.97E+3 5	F	(4+&5-)
5043 15	E	(1-)
5084.56 25	I	(4-)		1087.2 3	100		3997.22	(3-)
5109.88 20	D E G H I	(5-)	< 0.69 ps	594.9 2 1112.6 2	100 6 6.8 14	D	4515.04 3997.22	(4+) (3-)
5147.34 17	I	(5+)		632.3 1	100		4515.04	(4+)
5168 20	E
5281 20	E
5362 20	E
5434 20	E
5516.92 20	E I	(5-)		407.3 2 432.3 2 1001.9 2 1519.7 5	75 13 75 13 100 13 50 13		5109.88 5084.56 4515.04 3997.22	(5-) (4-) (4+) (3-)
5576 20	E
E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
6519 8	A		% n ≈ 100
6869.27 25	I	(7-)		1352.9 3 1759.1 2	91 18 100 9		5516.92 5109.88	(5-) (5-)
7039 36	A		% n ≈ 100
7269 46	A		% n ≈ 100
7309 51	A		% n ≈ 100
7619 66	A		% n ≈ 100
7999 87	A		% n ≈ 100
8249 97	A		% n ≈ 100
8.38E+3 5	F	(7-)
8.81E+3 12	A	(0-,1-)	% n ≈ 100
8.98E+3 5	F	(7-)
9239 46	A	(0-,1-)	% n ≈ 100
9779 72	A	(0-,1-)	% n ≈ 100
9.80E+3 5	F	(6+)
10.33E+3 5	F	(8+)
10430 36	A	(0-,1-)	% n ≈ 100
1.055E+4 11	A	(0-,1-)	% n ≈ 100
11059 36	A	(0-,1-)	% n ≈ 100
11479 52	A	(0-,1-)	% n ≈ 100

E(level): For levels populated in γ-ray studies, values are from least-squares to γ-ray energies. For levels populated in particle-reaction studies, averages are taken when possible

J^π(level): From DWBA analysis of σ(θ) in (t,p), except as noted. See (t,p) for additional tentative Jπ assignments. For L(t,p) and L(α,2p) transfer reactions, target Jπ=0⁺. Most L(t,p) are considered by the evaluators as tentative values due either to disagreements with other reactions or to weak populations of levels

T_1/2(level): From RDDS method in ²⁰⁸Pb(⁴⁸Ca,Xγ), unless otherwise stated

M(γ): From γ(θ) in ²⁰⁸Pb(⁴⁸Ca,Xγ), unless otherwise stated

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ) (keV)	Multipolarity	Additional Data
1026.72	2+	66.5 ps 21	1026.7 1	E2	B(E2)(W.u.)=0.68 2

E(level)	J^π(level)	T_1/2(level)	Comments
0.0	0+	13.45 s 5 % β^- = 100	Measured isotope shift δν(⁴⁰Ca,⁵⁰Ca)=1969.2 MHz 9(stat) 47(syst) (2016Ga34, using COLLAPS at ISOLDE-CERN). Previous measurement: 1951 MHz 9(stat) 20(syst) (1992Ve02, online collinear laser spectroscopy). E(level): Measured isotope shift δν(⁴⁰Ca,⁵⁰Ca)=1969.2 MHz 9(stat) 47(syst) (2016Ga34, using COLLAPS at ISOLDE-CERN). Previous measurement: 1951 MHz 9(stat) 20(syst) (1992Ve02, online collinear laser spectroscopy).
3531.7	(1,2+)		XREF: E(3519).
4.97E+3	(4+&5-)		J^π(level): From CCBA and DWBA analyses in (α,2p).
5084.56	(4-)		J^π(level): Tentative assignments in ²³⁸U(⁴⁸Ca,Xγ) based on γ-decay pattern and possible model predictions. No supporting data are available for transition multipolarity assignments.
5109.88	(5-)	< 0.69 ps	J^π(level): Tentative assignments in ²³⁸U(⁴⁸Ca,Xγ) based on γ-decay pattern and possible model predictions. No supporting data are available for transition multipolarity assignments.
5147.34	(5+)		J^π(level): Tentative assignments in ²³⁸U(⁴⁸Ca,Xγ) based on γ-decay pattern and possible model predictions. No supporting data are available for transition multipolarity assignments.
5516.92	(5-)		J^π(level): Tentative assignments in ²³⁸U(⁴⁸Ca,Xγ) based on γ-decay pattern and possible model predictions. No supporting data are available for transition multipolarity assignments.
6869.27	(7-)		J^π(level): Tentative assignments in ²³⁸U(⁴⁸Ca,Xγ) based on γ-decay pattern and possible model predictions. No supporting data are available for transition multipolarity assignments.
8.38E+3	(7-)		J^π(level): From CCBA and DWBA analyses in (α,2p).
8.81E+3	(0-,1-)	% n ≈ 100	J^π(level): From allowed β transition (log ft=4.1 to 4.9) from 0(-) parent state.
8.98E+3	(7-)		J^π(level): From CCBA and DWBA analyses in (α,2p).
9239	(0-,1-)	% n ≈ 100	J^π(level): From allowed β transition (log ft=4.1 to 4.9) from 0(-) parent state.
9779	(0-,1-)	% n ≈ 100	J^π(level): From allowed β transition (log ft=4.1 to 4.9) from 0(-) parent state.
9.80E+3	(6+)		J^π(level): From CCBA and DWBA analyses in (α,2p).
10.33E+3	(8+)		J^π(level): From CCBA and DWBA analyses in (α,2p).
10430	(0-,1-)	% n ≈ 100	J^π(level): From allowed β transition (log ft=4.1 to 4.9) from 0(-) parent state.
1.055E+4	(0-,1-)	% n ≈ 100	J^π(level): From allowed β transition (log ft=4.1 to 4.9) from 0(-) parent state.
11059	(0-,1-)	% n ≈ 100	J^π(level): From allowed β transition (log ft=4.1 to 4.9) from 0(-) parent state.
11479	(0-,1-)	% n ≈ 100	J^π(level): From allowed β transition (log ft=4.1 to 4.9) from 0(-) parent state.

E(level)	E(gamma)	Comments
1026.72	1026.7	E(γ): weighted average of 1027.0 5 from ⁵⁰K β^- decay (472 ms), 1026.2 3 from (²³⁸U,Xγ), and 1026.7 1 from (⁴⁸Ca,Xγ). Others: 1027 1 from ⁵¹K β^-n decay (365 ms), 1027 1 from ⁵²K β^-2n decay (110 ms), and 1028 2 from (⁵⁰Ca,p’γ) M(γ): γ(θ) and linear polarization in ²⁰⁸Pb(⁴⁸Ca,Xγ)
3002.1	1975.3	E(γ): from β^- decay. Other: 1976 1 from β^-n decay; 1978.2 6 in ⁴⁸Ca(²³⁸U,Xγ) is discrepant, possibly due to Doppler-shift effects. It is possible that 1978,2γ defined a level separate from 3002, (2⁺), but there is no strong evidence for its existence
3531.7	2504.5	E(γ): weighted average of 2504.9 5 from ⁵⁰K β^- decay (472 ms) and 2503 1 from ⁵¹K β^-n decay (365 ms) I(γ): from ⁵⁰K β^- decay . Other: 100 17 from β^-n decay
3531.7	3531.7	E(γ): weighted average of 3531.8 5 from ⁵⁰K β^- decay (472 ms) and 3530 2 from ⁵¹K β^-n decay (365 ms) I(γ): from ⁵⁰K β^- decay . Other: 133 17 from β^-n decay
3997.22	2970.3	E(γ): weighted average of 2964 8 from (⁵⁰Ca,p’γ), 2971.4 6 from (²³⁸U,Xγ), and 2970.2 2 from (⁴⁸Ca,Xγ)
4035.7	3008.8	E(γ): weighted average of 3008.9 5 from ⁵⁰K β^- decay and 3008 2 from ⁵¹K β^-n decay I(γ): from ⁵⁰K β^- decay. Others: 60 20 from ⁵¹K β^-n decay and 75 25 from (⁵⁰Ca,p’γ)
4035.7	4035.6	E(γ): weighted average of 4035.6 5 from ⁵⁰K β^- decay and 4035 2 from ⁵¹K β^-n decay. Other: 4030 18 from (⁵⁰Ca,p’γ). From β^- decay I(γ): from ⁵⁰K β^- decay. Others: 100 20 from ⁵¹K β^-n decay, and 100 25 from (⁵⁰Ca,p’γ)
4475.8	3449.0	E(γ): From β^- decay
4515.04	3488.2	E(γ): others: 3482 14 from (⁵⁰Ca,p’γ) and 3488.4 8 from (²³⁸U,Xγ)
4830.6	833.4	E(γ): weighted average of 833.9 5 from (²³⁸U,Xγ) and 833.3 2 from (⁴⁸Ca,Xγ)
4870	4870	E(γ): from (²³⁸U,Xγ) only
4886.3	4886.0	E(γ): From β^- decay
5109.88	594.9	E(γ): weighted average of 603 11 from (⁵⁰Ca,p’γ), 595.5 3 from (²³⁸U,Xγ), and 594.8 1 from (⁴⁸Ca,Xγ)