List of levels for 142PM

Authors: T.D. Johnson, D. Symochko, M. Fadil, and J.K. Tuli | Citation: Nucl. Data Sheets 112, 1949 (2011) | Cutoff date: 1-Jun-2010

Ionized atom T_1/2:

2009Wi09: Be(¹⁵²Sm,X): Decay of ¹⁴²Pm^61⁺, ¹⁴²Pm^60⁺ and ¹⁴²Pm^59⁺ Experiment: Beryllium target of 2.513 gm/cm² was bombarded with a 607.4 MeV/α ¹⁵²Sm beam delivered by the heavy-ion accelerator (SIS) at GSI. The fully ionized ¹⁴²Pm ions were separated in flight with FRS employing a two-fold magnetic rigidity analysis and 731 mg/cm² Al energy degrader. The ¹⁴²Pm ions were injected into the storage ring ESR and stored in ultra-high vacuum. Identification of cooled ¹⁴²Pm^59⁺, ¹⁴²Pm^60⁺ and ¹⁴²Pm^61⁺ ions and their decay products were achieved using the Schottky Mass Spectrometry technique. Half lives presented are correlated to the average decay with cooler currents at 50mA and 250mA. Decay constants associated with individual cooler currents can be found in the reference. T_1/2=56 s 3 for ¹⁴²Pm^61⁺ (fully-stripped ions); only β⁺ decay mode is possible for fully-stripped ions. For ¹⁴²Pm^60⁺ (H-like ions): T_1/2(β⁺+ε)=39.2 s 6; T_1/2(β⁺)=55.0 s 13; T_1/2(ε)=135.9 s 27 and %ε/(%ε+%β⁺)=29.0 % 13. For ¹⁴²Pm^59⁺ (He-like ions): T_1/2(β⁺+ε)=39.6 s 14; T_1/2(β⁺)=49.9 s 22, T_1/2(ε)=193 s 5 and %ε/(%ε+%β⁺)=20.2 % 10.

2008Ve06: ¹²⁴Sn(²³Na,5n): ¹⁴²Pm was produced by bombardment of a 400 μg/cm² thick ¹²⁴Sn target with 95 MeV ²³Na beams (average beam intensity 100 pnA). The reaction products moved through the Berkeley Gas-filled separator, which separated the ¹⁴²Pm from the beam and other products by their different magnetic rigidities. The ¹⁴²Pm ions were stopped in a 25 μm thick Al foil. The emitted γ and x rays were measured with an intrinsic Ge "clover " detector. This experiment searched for oscillations (time-modulation) in the ε decay probability in ¹⁴²Pm (neutral atom) isotope. Observation of a non-exponential ε decay was originally reported by 2008Li21: in the ε decay of ionized (hydrogen-like) ¹⁴⁰Pr and ¹⁴²Pm. T_1/2=40.68 s 53 from 2008Ve06 using a single-exponential decay function fit to the ¹⁴²Nd K_α x rays. Note that β⁺ half-life was measured to be T_1/2=41.11 s 38. This was obtained in 2008Ve06 using a single-exponential decay fit to the 511-keV line from annihilation radiation. The electron conversion half-life was measured here to be 40.68 s 53. In the decay curves of ¹⁴²Nd K_α x rays and annihilation radiation, no evidence of (statistically significant) oscillatory pattern was found by 2008Ve06. The authors conclude that any oscillation, not resolved in their experiment, must have an amplitude smaller by a factor of 31 than the one reported by 2008Li21. 2008Ve06 do, however, point out that ε decays of hydrogen-like ions (as used in 2008Li21) may in some, hitherto unknown way, differ from the ε decay of neutral atom used in 2008Ve06.

2008Li21: ⁹Be(¹⁵²Sm,X): ion T_1/2 ¹⁴²Pm was produced by in-flight fragmentation of relativistic heavy projectiles. The beam was ¹⁵²Sm at 500-600 MeV/α bombarding a ⁹Be target with thicknesses of 1 and 2 g/cm². Fragment mass separator (FRS) was used to identify ¹⁴²Pm residues. Measured half-life of (hydrogen-like) ¹⁴²Pm^60⁺ ions using time-resolved Schottky mass spectrometry at GSI facility. 2008Li21 report observing non-exponential decay pattern of hydrogen-like ions with a time-modulation period of ≈7s. All half-lives given here are for (hydrogen-like) ¹⁴²Pm^60⁺ ion. T_1/2=40.7 s +24-20 from decay constant |l=0.0170 s^-1 9 (2008Li21) using a single-exponential decay function. T_1/2 from decay constant |l=0.0240 s^-1 42 or 28.9 s +61-43 using a single-exponential decay function, but only those data were fitted that were collected within 33 s after injections of the ions. T_1/2 decay constant |l=0.0224 s^-1 42 or 30.9 s +72-49 using a single-exponential decay and superimposed periodic time modulation functions fit. Q(ε)=4830 keV (2008Li21) for decay of ¹⁴²Pm^60⁺ as compared to 4798 25 (2003Au03) for decay of neutral ¹⁴²Pm.

Q-value: Note: Current evaluation has used the following Q record -2170 30 8.71×10³ 3 4250 30 -450 30 2011AuZZ

Q-value: Q(β^-n)=-13290 3, Q(εp)=-2420 3 2011AuZZ

Q-value: Values in 2003Au03: Q(β^-)=-2160 3, S(n)=8710 3, S(p)=4.25×10³ 3, Q(α)=-450 3, Q(β^-n)=-13290 3, Q(εp)=-2420 3

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ) (keV)	Multipolarity	Conversion Coefficient	Additional Data
208.52	(2)+		208.5 1	M1	0.198	α=0.198, α(K)=0.1681 24, α(L)=0.0233 4, α(M)=0.00497 7, α(N)=0.001121 16, α(O)=0.0001693 24, α(P)=1.076×10^-5 16, α(N+)=0.001301 19
240.98	(3)+	1.1 ns 3	32.45 10	M1	6.31	B(M1)(W.u.)=0.049 14, α=6.31 11, α(L)=4.97 9, α(M)=1.061 18, α(N)=0.239 4, α(O)=0.0360 6, α(P)=0.00225 4, α(N+)=0.277 5
240.98	(3)+	1.1 ns 3	241.0 1	E2	0.1091	B(E2)(W.u.)=4.8 14, α=0.1091, α(K)=0.0828 12, α(L)=0.0206 3, α(M)=0.00458 7, α(N)=0.001010 15, α(O)=0.0001380 20, α(P)=4.32E-6 6, α(N+)=0.001152 17
412.01	(3)+		171.0 2	M1,E2	0.342	α=0.342 6, α(K)=0.27 3, α(L)=0.060 21, α(M)=0.013 5, α(N)=0.0030 11, α(O)=0.00041 12, α(P)=1.5×10^-5 4, α(N+)=0.0034 12
412.01	(3)+		203.5 1	(M1,E2)	0.201	α=0.201 11, α(K)=0.160 20, α(L)=0.032 8, α(M)=0.0071 18, α(N)=0.0016 4, α(O)=0.00022 5, α(P)=9.3×10^-6 23, α(N+)=0.0018 5
449.47	(5)+	16.5 ns 15	37.5	[E2]	113.1	B(E2)(W.u.)≈3.7, α=113.1
449.47	(5)+	16.5 ns 15	208.5 1	[E2]	0.1759	B(E2)(W.u.)=1.61 15, α=0.1759, α(K)=0.1297 19, α(L)=0.0361 6, α(M)=0.00810 12, α(N)=0.00178 3, α(O)=0.000240 4, α(P)=6.57E-6 10, α(N+)=0.00203 3
460.00	(4)+		219.0 1	M1	0.1729	α=0.1729, α(K)=0.1471 21, α(L)=0.0204 3, α(M)=0.00434 7, α(N)=0.000979 14, α(O)=0.0001479 21, α(P)=9.41×10^-6 14, α(N+)=0.001137 16
496.30	(2)+		496.3 3	(M1)	0.0202	α=0.0202, α(K)=0.01728 25, α(L)=0.00233 4, α(M)=0.000496 7, α(N)=0.0001118 16, α(O)=1.693×10^-5 24, α(P)=1.091E-6 16, α(N+)=0.0001298 19
513.12	(3)+		304.6 1	M1,E2	0.062	α=0.062 10, α(K)=0.051 10, α(L)=0.00849 20, α(M)=0.00184 7, α(N)=0.000412 13, α(O)=5.97×10^-5 13, α(P)=3.0E-6 9, α(N+)=0.000474 12
618.30	(2)+		377.3 3	M1	0.0408	α=0.0408, α(K)=0.0348 5, α(L)=0.00474 7, α(M)=0.001009 15, α(N)=0.000227 4, α(O)=3.44×10^-5 5, α(P)=2.21E-6 4, α(N+)=0.000264 4
618.30	(2)+		618.3 1	M1	0.01168	α=0.01168, α(K)=0.00999 14, α(L)=0.001337 19, α(M)=0.000284 4, α(N)=6.41×10^-5 9, α(O)=9.71E-6 14, α(P)=6.28E-7 9, α(N+)=7.44E-5 11
678.30	(2)-		678.3 1	E1	0.00212	α=0.00212 3, α(K)=0.00182 3, α(L)=0.000236 4, α(M)=4.99×10^-5 7, α(N)=1.121E-5 16, α(O)=1.684E-6 24, α(P)=1.057E-7 15, α(N+)=1.300E-5 19
706.80	(4)+		465.8 3	M1	0.0238	α=0.0238, α(K)=0.0203 3, α(L)=0.00274 4, α(M)=0.000583 9, α(N)=0.0001315 19, α(O)=1.99×10^-5 3, α(P)=1.282E-6 18, α(N+)=0.0001527 22
883.17	(8)-	2.0 ms 2 % IT = 100	433.7 1	E3	0.0559	B(E3)(W.u.)=0.166 17, α=0.0559, α(K)=0.0407 6, α(L)=0.01183 17, α(M)=0.00267 4, α(N)=0.000591 9, α(O)=8.11E-5 12, α(P)=2.46E-6 4, α(N+)=0.000675 10
980.80	(3)-		302.5 1	M1,E2	0.063	α=0.063 10, α(K)=0.052 11, α(L)=0.00868 22, α(M)=0.00188 8, α(N)=0.000421 14, α(O)=6.10×10^-5 12, α(P)=3.1E-6 9, α(N+)=0.000485 13
998.01	(5-)		538.0 1	(E1)	0.00350	α=0.00350 5, α(K)=0.00300 5, α(L)=0.000393 6, α(M)=8.31×10^-5 12, α(N)=1.87E-5 3, α(O)=2.79E-6 4, α(P)=1.727E-7 25, α(N+)=2.16E-5 3
1024.36	(6)-		574.9 1	E1	0.00302	α=0.00302 5, α(K)=0.00259 4, α(L)=0.000338 5, α(M)=7.16×10^-5 10, α(N)=1.608E-5 23, α(O)=2.41E-6 4, α(P)=1.496E-7 21, α(N+)=1.86E-5 3
1163.80	(4-)		485.5 2	(E2)	0.01330	α=0.01330, α(K)=0.01095 16, α(L)=0.00185 3, α(M)=0.000402 6, α(N)=8.96×10^-5 13, α(O)=1.293E-5 19, α(P)=6.34E-7 9, α(N+)=0.0001032 15
1190.82	(7)-		166.5 2	M1,E2	0.372	α=0.372 8, α(K)=0.29 3, α(L)=0.067 24, α(M)=0.015 6, α(N)=0.0033 12, α(O)=0.00045 14, α(P)=1.6×10^-5 4, α(N+)=0.0037 14
1809.4	(10+)		44.0 3	M1+E2	27	α=27 25, α(L)=21 19, α(M)=5 5, α(N)=1.1 10, α(O)=0.13 12, α(P)=0.0006 3, α(N+)=1.2 11
2828.7	(13-)	67 µs 5	638.6 3	[M2+E3]	0.024	α=0.024 8, α(K)=0.020 7, α(L)=0.0033 6, α(M)=0.00072 12, α(N)=0.00016 3, α(O)=2.4×10^-5 5, α(P)=1.3E-6 5, α(N+)=0.00019 4
2828.7	(13-)	67 µs 5	1019.4	[E3]	0.00481	α=0.00481 7, α(K)=0.00399 6, α(L)=0.000640 9, α(M)=0.0001385 20, α(N)=3.10×10^-5 5, α(O)=4.57E-6 7, α(P)=2.50E-7 4, α(N+)=3.59E-5 5
3300.3	(12+)		1110.4 9	M1+E2	0.0024	α=0.0024 5, α(K)=0.0020 5, α(L)=0.00027 5, α(M)=5.8×10^-5 11, α(N)=1.30E-5 24, α(O)=2.0E-6 4, α(P)=1.2E-7 3, α(N+)=1.6E-5 3
3886.6	(14-)		1057.9 6	M1+E2	0.0026	α=0.0026 6, α(K)=0.0023 5, α(L)=0.00030 6, α(M)=6.4×10^-5 12, α(N)=1.5E-5 3, α(O)=2.2E-6 5, α(P)=1.4E-7 4, α(N+)=1.7E-5 4
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ) (keV)	Multipolarity	Conversion Coefficient	Additional Data

Q(β-)=-2155 keV 24	S(n)= 8.69×10³ keV 3	S(p)= 4238 keV 24	Q(α)= -4.4×10² keV 3
Reference: 2012WA38

References:
A	¹⁴²Pm IT decay	B	¹⁴²Sm ε decay
C	¹⁴²Nd(p,nγ) E=10 MeV	D	¹⁴²Nd(d,2nγ) E=13.5 MeV
E	(HI,xnγ)

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	1+	40.5 s 5 % ε = 100
208.52 8	A C D E	(2)+		208.5 1	100	M1	0.0	1+
240.98 8	A C D E	(3)+	1.1 ns 3	32.45 10 241.0 1	25.2 100	M1 E2	208.52 0.0	(2)+ 1+
412.01 12	A C D E	(3)+		171.0 2 203.5 1	15 100	M1,E2 (M1,E2)	240.98 208.52	(3)+ (2)+
449.47 13	A C D E	(5)+	16.5 ns 15	37.5 208.5 1	100	[E2] [E2]	412.01 240.98	(3)+ (3)+
460.00 12	C D E	(4)+		219.0 1	100	M1	240.98	(3)+
496.30 18	C D	(2)+		255.4 3 287.7 3 496.3 3	100 82 85	(M1)	240.98 208.52 0.0	(3)+ (2)+ 1+
513.12 13	C D	(3)+		304.6 1	100	M1,E2	208.52	(2)+
618.30 10	C D	(2)+		377.3 3 618.3 1	52 100	M1 M1	240.98 0.0	(3)+ 1+
678.30 10	B C D	(2)-		678.3 1	100	E1	0.0	1+
706.80 20	C D	(4)+		246.8 3 294.8 3 465.8 3	100 65 94	M1	460.00 412.01 240.98	(4)+ (3)+ (3)+
860.2 4 ?	C D			448.2 3	100		412.01	(3)+
883.17 16	A C D E	(8)-	2.0 ms 2 % IT = 100	433.7 1	100	E3	449.47	(5)+
980.80 15	C D	(3)-		302.5 1	100	M1,E2	678.30	(2)-
998.01 16	C D E	(5-)		538.0 1	100	(E1)	460.00	(4)+
1024.36 16	C D E	(6)-		26.4 3 ? 574.9 1	15 100	E1	998.01 449.47	(5-) (5)+
1076.70 18	C D	(4-)		95.9 1			980.80	(3)-
1078.30 16 ?	C D	(5)		618.3 1	100		460.00	(4)+
1163.80 23	C D	(4-)		485.5 2	100	(E2)	678.30	(2)-
E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
1185.20 23	C D	(5-)		108.5 2 204.4 3	80 100		1076.70 980.80	(4-) (3)-
1190.82 21	C D E	(7)-		166.5 2 192.7 3	100 38	M1,E2	1024.36 998.01	(6)- (5-)
1237.1 4 ?	C D			160.4 3	100		1076.70	(4-)
1310.1 5	E	(9-)		426.8 6	100.0		883.17	(8)-
1335.0 11 ?	D			337	100		998.01	(5-)
1765.4 4	E	(9+)		455.2 6 882.2 3	6.901 100.0		1310.1 883.17	(9-) (8)-
1809.4 5	E	(10+)		44.0 3	100.0	M1+E2	1765.4	(9+)
2190.1 6	E	(11+)		380.8 3	100.0		1809.4	(10+)
2828.7 6	E	(13-)	67 µs 5	638.6 3 1019.4	100.0 25.08	[M2+E3] [E3]	2190.1 1809.4	(11+) (10+)
3143.8 7	E	(14-)	< 0.69 ns	315.1 3	100.00		2828.7	(13-)
3300.3 7	E	(12+)		1110.4 9 1490.6 9	100.0 <22.73	M1+E2	2190.1 1809.4	(11+) (10+)
3507.4 9	E			1317.2 9	<100.0		2190.1	(11+)
3738.0 8	E	(13+)		437.6 9 1548.0 9	100.0 64.52	D Q	3300.3 2190.1	(12+) (11+)
3798.3 8	E	(13+)		498.0 9 1608.2 9	100.0 57.89		3300.3 2190.1	(12+) (11+)
3820.4 7	E	(14)	0.8 ns 5	991.6 3	100.0		2828.7	(13-)
3872.3 7	E	(15)		52.0 6 728.5 6	50.50 100.0	D	3820.4 3143.8	(14) (14-)
3886.6 7	E	(14-)		88.4 9 148.7 9 742.8 6 1057.9 6	0.000 55.17 96.55 100.0	D M1+E2	3798.3 3738.0 3143.8 2828.7	(13+) (13+) (14-) (13-)
4015.2 8	E	(16)	9 ns 4	142.9 3	100.0		3872.3	(15)
4061.9 8	E	(15)		175.4 6 241.2 9	100.00 28.05		3886.6 3820.4	(14-) (14)
E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
4073.1 9	E			565.7 9 772.9 9	<100.0 <100.0		3507.4 3300.3	(12+)
4185.9 9	E			1042.1 6	100.0		3143.8	(14-)
4236.6 8	E	(17)	2.8 ns 9	221.3 3	100.0		4015.2	(16)
4325.1 10	E			251.9 9 526.8 9	100.0 91.67		4073.1 3798.3	(13+)
4339.9 9	E	(16)		277.9 6 324.7 9	100.0 32.14		4061.9 4015.2	(15) (16)
4391.7 8	E			205.8 9 329.8 9 519.3 6	37.14 58.57 100.0		4185.9 4061.9 3872.3	(15) (15)
4640.5 12	E			248.8 9	100.0		4391.7
4774.3 14	E			449.2 9	100.0		4325.1
4787.1 11	E			447.3 9	<100.0		4339.9	(16)
4970.0 9	E	(16)		1097.7 6	100.0		3872.3	(15)
5008.4 10	E	(18)		221.4 9 771.7 9	<23.81 100.0		4787.1 4236.6	(17)
5031.6 10	E			61.8 9 691.6 9	0.000 100.0		4970.0 4339.9	(16) (16)
5356.8 12	E			325.2 6	100.0		5031.6
5615.2 10	E	(19)		1378.6 6	100.0		4236.6	(17)
5618.0 10	E	(19)		609.6 9 1381.4 6	36.29 100.0		5008.4 4236.6	(18) (17)
5672.4 15	E			315.6 9	100.0		5356.8
5810.3 10	E	(20)		192.3 6 195.1 6	100.0 52.48		5618.0 5615.2	(19) (19)
6475.6 12	E	(21)		665.3 6	100.0		5810.3	(20)
6815.3 12	E	(21)		1005.0 6	100.0		5810.3	(20)
7030.3 15	E	(22)		554.7 9	100.0		6475.6	(21)

E(level)	E(gamma)	Comments
208.52	208.5	E(γ): Multiply placed with intensity suitably divided I(γ): Multiply placed with intensity suitably divided
449.47	208.5	E(γ): Multiply placed with intensity suitably divided I(γ): Multiply placed with intensity suitably divided
618.30	618.3	E(γ): Multiply placed with intensity suitably divided I(γ): Multiply placed with intensity suitably divided
1078.30	618.3	E(γ): Multiply placed with intensity suitably divided I(γ): Multiply placed with intensity suitably divided