List of levels for 30MG

Authors: M. S. Basunia, A. Chakraborty | Citation: Nucl. Data Sheets 197, 1 (2024) | Cutoff date: 31-May-2024

1971Ar32: First identification of ³⁰Mg in bombardment of a ²³²Th target with 290 MeV ⁴⁰Ar ions at JNIR, Dubna, USSR. The charged-particle identification was done combining the magnetic analysis and the ΔE-E technique.

1997Fo01: Measured production yield of 100 μb in ³⁷Cl+²⁰⁸Pb reaction, E=230 MeV.

Atomic excess mass measurements: 2013Ch49, 2006Ga04, 1991Or01, 1986Vi09, 1991Zh24.

Nuclear effective root-mean-square (rms) radius measurement: 3.06 fm 2 and 3.08 fm 2, restricting size and diffuseness parameters, respectively (1998Su07,1997Su04).

Production cross sections |J50 μb and |J0.2 mb were measured in fragmentation of ⁹Be(⁴⁰Ar,X): E=90α MeV and 94α MeV and ¹⁸¹Ta(⁴⁰Ar,X): E=94 MeV/nucleon, respectively (2007No13). Similar data also reported in 2012Kw02.

Production cross sections |J0.12 mb and |J0.19 mb were measured in fragmentation of ⁹Be(⁴⁰Ar,X) and ¹⁸¹Ta(⁴⁰Ar,X), E=57 MeV/nucleon, respectively (2012Zh06).

In 2006Kh08, 55.77 and 48.73 MeV/α beams of ³⁰Mg impinged on a Si target, measured σ=2370 mb 86 and σ=2342 mb 37, respectively, for the Si(³⁰Mg,x) reaction and a reduced strong absorption radius of <r₀²>=1.215 fm² 18 is deduced and used to study the isospin dependence.

DICT$ C(³¹Mg,³⁰MgG)=C(³¹Mg,³⁰Mgγ)

Q-value: S(2n)=10004.1 13, S(2p)=3.476×10⁴ 13, Q(β^-n)=1255.1 13 (2021Wa16)

E(level): From a least-squares fit to the γ-ray energies. During the fit the uncertainty of 990.0γ depopulating the 3461 keV level is increased from 0.5 to 1.0 to reduce the deviation less than 3σ.

T_1/2(level): From ³¹Na β^-n decay, except otherwise noted.

M(γ): From (¹⁸O,2pγ) based on γ(θ) measurements, except where otherwise noted.

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ) (keV)	Multipolarity	Conversion Coefficient	Additional Data
1483.14	2+	1.53 ps 20	1483.1 2	E2	9.06×10^-5	B(E2)(W.u.)=9.3 +14-11, α=9.06E-5 13, α(K)=7.84E-6 11, α(L)=5.04E-7 7, α(M)=1.866E-8 26
1788.21	0+	3.8 ns 4	305.3 2	[E2]	9.18×10^-4	B(E2)(W.u.)=10.1 +12-10, α=9.18E-4 13, α(K)=0.000860 12, α(L)=5.53E-5 8, α(M)=2.037E-6 29

Q(β-)=6982.7 keV 23	S(n)= 6340.3 keV 13	S(p)= 18850 keV 7	Q(α)= -11787 keV 18
Reference: 2021WA16

References:
A	³⁰Na β^- decay (45.4 MS)	B	³¹Na β^-n decay
C	³²Na β^-2n decay	D	C(³⁰Mg,³⁰Mg’γ),NI(³⁰Mg,³⁰Mg’)
E	C(³¹Mg,³⁰MgG)	F	¹⁴C(¹⁸O,2pγ)

E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
0	A B C D E F	0+	319 ms 6 % β^- = 100
1483.14 11	A B C D E F	2+	1.53 ps 20	1483.1 2	100	E2	0	0+
1788.21 16	A B E	0+	3.8 ns 4	305.3 2 1788	100	[E2] E0	1483.14 0	2+ 0+
2468.10 13	A B E F	(2+)	< 5 ps	985.0 2	100		1483.14	2+
2543.2 4	F	(2-,3-)		1059.8 9	100	(D+Q)	1483.14	2+
3303.75 25	A B E	(1,2,3)		1820.4 4	100		1483.14	2+
3381.60 18	A E F	(4+)		838.4 3 1898.3 2	20 7 100 8	Q	2543.2 1483.14	(2-,3-) 2+
3461.72 13	A B E F	(2)		1978.2 2	100		1483.14	2+
3462.82 20	A	(1,2)		994.7 3 1979.6 2	5.9 11 100 14		2468.10 1483.14	(2+) 2+
3542.65 14	A E	(2+)		2059.5 2 3542.3 3	25 8 100 7		1483.14 0	2+ 0+
4183.9 7	E F	(5)		802.3 6	100	D	3381.60	(4+)
4259.5 3	A E F	(2,3,4)		879.0 9 ? 955.7 2			3381.60 3303.75	(4+) (1,2,3)
4262.6 11	E			881 1	100		3381.60	(4+)
4297.72 20	A	(1,2+)		4297.2 4	100		0	0+
4359.2 24	F			1816.0 23	100		2543.2	(2-,3-)
4683.76 19	A E	(2,3,4)		1221.9 3 3200.0 3	48 9 100 14		3461.72 1483.14	(2) 2+
4694.78 22	A E	(3+)		1152.0 4 2226.6 3 3211.5 3	82 7 48 14 100 13		3542.65 2468.10 1483.14	(2+) (2+) 2+
4783.33 22	A	(2,3,4)		1479.5 5 3300.1 4	48 28 100 13		3303.75 1483.14	(1,2,3) 2+
4967.48 12	A B E	1+		669.5 4 1505.9 2 2499.2 2 3179.3 2 3484.1 2 4966.8 2	2.3 8 54 4 11.3 10 79 6 71 6 100 7		4297.72 3461.72 2468.10 1788.21 1483.14 0	(1,2+) (2) (2+) 0+ 2+ 0+
E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
5022.03 15	A E	1+		724.4 4 1559.6 2 3539.4 5 5022.1 2	1.8 7 25.6 25 14.9 25 100 6		4297.72 3462.82 1483.14 0	(1,2+) (1,2) 2+ 0+
5095.16 13	A B E	2+		797.4 3 1552.4 2 1633.2 4 1789.5 10 2627.1 2 3611.9 4 5094.7 2	14.0 13 69 6 21.0 19 60 10 28 3 11.4 14 100 6		4297.72 3542.65 3461.72 3303.75 2468.10 1483.14 0	(1,2+) (2+) (2) (1,2,3) (2+) 2+ 0+
5213 3	E	(2)-		1670 3	100		3542.65	(2+)
5313 3 ?	F			954.0 15 ?	100		4359.2
5413.62 12	A E	2+		1871.0 2 1951.9 3 2945.3 2 3625.2 3 3930.2 2 5413.0 2	20.8 20 64 10 19.7 18 47 4 100 8 100 7		3542.65 3461.72 2468.10 1788.21 1483.14 0	(2+) (2) (2+) 0+ 2+ 0+
5619.33 19	A	(1+,2+)		2157.6 2 5618.6 3	71 27 100 11		3461.72 0	(2) 0+
5898.45 18	A E	1+		3430.2 2 4414.9 2	100 11 80 7		2468.10 1483.14	(2+) 2+
5921.2 4	A E			2458.9 4 2618.0 5	100 39 25 7		3462.82 3303.75	(1,2) (1,2,3)
6066.34 15	A E	3+		1283.0 2 1382.3 2 1806.6 3 2605.1 3 2684.5 2 3597.9 3 4583.0 2	36 5 14.2 22 29 4 65 5 100 9 34 4 16 9		4783.33 4683.76 4259.5 3461.72 3381.60 2468.10 1483.14	(2,3,4) (2,3,4) (2,3,4) (2) (4+) (2+) 2+

E(level)	J^π(level)	T_1/2(level)	Comments
0	0+	319 ms 6 % β^- = 100	δ<r²>(²⁶Mg,³⁰Mg)=+0.473 fm² 5 (stat) 56 (syst) (2012Yo01). E(level): δ<r²>(²⁶Mg,³⁰Mg)=+0.473 fm² 5 (stat) 56 (syst) (2012Yo01). g.s. band.
1483.14	2+	1.53 ps 20	E(level): g.s. band.
1788.21	0+	3.8 ns 4	E(level): Deformed band.
2468.10	(2+)	< 5 ps	E(level): Deformed band.
3461.72	(2)		XREF: F(3455).
3542.65	(2+)		E(level): From (¹⁸O,2pγ). γ-vibrational band.
4259.5	(2,3,4)		J^π(level): Proposed in 2020Ni05 ³⁰Na β- decay, based on γ feeding from 3⁺ at 6066.
4683.76	(2,3,4)		J^π(level): Proposed in 2020Ni05 ³⁰Na β- decay, based on γ feeding from 3⁺ at 6066.
4694.78	(3+)		E(level): From (¹⁸O,2pγ). γ-vibrational band. J^π(level): Based on allowed transition from 2⁺ in ³⁰Na β^- decay and β asymmetry measurements for polarized ³⁰Na. Asymmetry parameter (α) values of -1.0, -0.33, and +0.67 were expected for spins 1⁺, 2⁺, and 3⁺, respectively (2020Ni05).
4783.33	(2,3,4)		J^π(level): Proposed in 2020Ni05 ³⁰Na β- decay, based on γ feeding from 3⁺ at 6066.
4967.48	1+		J^π(level): Based on allowed transition from 2⁺ in ³⁰Na β^- decay and β asymmetry measurements for polarized ³⁰Na. Asymmetry parameter (α) values of -1.0, -0.33, and +0.67 were expected for spins 1⁺, 2⁺, and 3⁺, respectively (2020Ni05).
5022.03	1+		J^π(level): Based on allowed transition from 2⁺ in ³⁰Na β^- decay and β asymmetry measurements for polarized ³⁰Na. Asymmetry parameter (α) values of -1.0, -0.33, and +0.67 were expected for spins 1⁺, 2⁺, and 3⁺, respectively (2020Ni05).
5095.16	2+		J^π(level): Based on allowed transition from 2⁺ in ³⁰Na β^- decay and β asymmetry measurements for polarized ³⁰Na. Asymmetry parameter (α) values of -1.0, -0.33, and +0.67 were expected for spins 1⁺, 2⁺, and 3⁺, respectively (2020Ni05).
5413.62	2+		J^π(level): Based on allowed transition from 2⁺ in ³⁰Na β^- decay and β asymmetry measurements for polarized ³⁰Na. Asymmetry parameter (α) values of -1.0, -0.33, and +0.67 were expected for spins 1⁺, 2⁺, and 3⁺, respectively (2020Ni05).
5619.33	(1+,2+)		J^π(level): Based on allowed transition from 2⁺ in ³⁰Na β^- decay and β asymmetry measurements for polarized ³⁰Na. Asymmetry parameter (α) values of -1.0, -0.33, and +0.67 were expected for spins 1⁺, 2⁺, and 3⁺, respectively (2020Ni05).
5898.45	1+		J^π(level): Based on allowed transition from 2⁺ in ³⁰Na β^- decay and β asymmetry measurements for polarized ³⁰Na. Asymmetry parameter (α) values of -1.0, -0.33, and +0.67 were expected for spins 1⁺, 2⁺, and 3⁺, respectively (2020Ni05).
6066.34	3+		J^π(level): Based on allowed transition from 2⁺ in ³⁰Na β^- decay and β asymmetry measurements for polarized ³⁰Na. Asymmetry parameter (α) values of -1.0, -0.33, and +0.67 were expected for spins 1⁺, 2⁺, and 3⁺, respectively (2020Ni05).

E(level)	E(gamma)	Comments
1483.14	1483.1	E(γ): other: 1480.6 5 (¹⁸O,2pγ)
1788.21	305.3	E(γ): weighted average of 305.1 2 from ³⁰Na β^- decay and 305.6 3 from ³¹Na β^-n decay. Other: 300 5 from (³¹Mg,³⁰Mgγ)
2468.10	985.0	M(γ): 2005Ma96 (³¹Na β-n decay) argue 985.1γ to be of dominant M1 character from the B(E2) values.
2543.2	1059.8	E(γ): From (¹⁸O,2pγ)
3303.75	1820.4	E(γ): weighted average of 1820.5 3 from ³⁰Na β^- decay and 1820.4 6 from ³¹Na β^-n decay. Other: 1817 2 from (³¹Mg,³⁰Mgγ). Placement of 1820γ is shown from the 1820 keV level in ³⁰Na β^- decay (1984Gu19). 2005Ma96 (³¹Na β^-n decay) placed this γ-ray from the 3303 keV level based on the 1789-1820-1482 cascade γ-rays.
3381.60	838.4	E(γ): From (¹⁸O,2pγ) I(γ): From (¹⁸O,2pγ)
3381.60	1898.3	E(γ): weighted average of 1898.3 2 from ³⁰Na β^- decay and 1898.4 8 from (¹⁸O,2pγ). Other: 1898 2 from (³¹Mg,³⁰Mgγ) I(γ): From (¹⁸O,2pγ)
3461.72	1978.2	E(γ): weighted average of 1978.2 2 from ³⁰Na β^- decay and 1978.1 6 from ³¹Na β^-n decay. Others: 1974.8 19 from (¹⁸O,2pγ) and 1976 2 from (³¹Mg,³⁰Mgγ) M(γ): Q in (¹⁸O,2pγ), not consistent with the latest spin assignments.
3462.82	994.7	E(γ): Other: 990.0 5, in (¹⁸O,2pγ) the placement from 3461 keV level - fits poorly (deviation more than 5σ from the calculated value of 993.4). Most likely same Eγ (994.7) from this level. Two close by levels have been proposed and confirmed in 2020Ni05 ³⁰Na β- decay.
4183.9	802.3	E(γ): From (¹⁸O,2pγ)
4259.5	879.0	E(γ): the γ-ray reported in (¹⁸O,2pγ) (2010De26) only. It appears that in (³¹Mg,³⁰Mgγ) (2018Fe05) and in ³⁰Na β- decay (2020Ni05), same level has been proposed but only with 955γ. In (¹⁸O,2pγ), however, 955γ has been placed from 5313 keV level. The evaluators mark this Eγ as questionable placement.. From (¹⁸O,2pγ)
4262.6	881	E(γ): From (³¹Mg,³⁰Mgγ)
4359.2	1816.0	E(γ): From (¹⁸O,2pγ)
4683.76	3200.0	E(γ): other: 3200 5 (³¹Mg,³⁰Mgγ)
4694.78	2226.6	E(γ): other: 2219 5 (³¹Mg,³⁰Mgγ)
5095.16	1789.5	E(γ): In 2005Ma96 (³¹Na β^-n decay), 1788γ is placed from the 5091.7 keV level based on the 1789-1820-1482 cascade γ-rays. In 2005Ma96, it is speculated that the levels at 5091.7 keV and 5093 keV (1993Kl02 - (³¹Na β-n decay)), are the same. Here only 5095.16 keV in this dataset.
5213	1670	E(γ): From (³¹Mg,³⁰Mgγ)
5313	954.0	E(γ): other placement: comparable 956γ from 4252 keV level in (³¹Mg,³⁰Mgγ) (2018Fe05) and 955.7γ from 4259.5 in ³⁰Na β- decay (2020Ni05), perhaps both 4252 and 4259.5 keV levels are same. Evaluators consider it as a questionable placement.. From (¹⁸O,2pγ)
5898.45	3430.2	I(γ): From (³¹Mg,³⁰Mgγ)
5898.45	4414.9	I(γ): weighted average of 83 7 from ³⁰Na β^- decay and 74 11 from (³¹Mg,³⁰Mgγ)
6066.34	4583.0	E(γ): Other: 4582 (³¹Mg,³⁰Mgγ)