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Periodic Table of Elements

La - Lanthanum

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Nuclides / Isotopes

Nuc- lide	Atomic Mass	NN	Abun %	Spin	Half Life	DM	DT	BR %	Decay Energy (MeV)
La117	116.95	60	Syn
La118	117.947	61	Syn
La119	118.941	62	Syn
La120	119.938	63	Syn		2.8s	ε	Ba120		11.200
					2.8s	ε + P	Cs119		7.400
La121	120.933	64	Syn		5.3s	ε	Ba121		7.900
La122	121.931	65	Syn		8.7s	ε	Ba122		9.700
					8.7s	ε + P	Cs121		5.300
La123	122.926	66	Syn		17s	ε	Ba123		6.900
La124	123.925	67	Syn		29s	ε	Ba124		8.800
La125	124.921	68	Syn	11/2-	76s	ε	Ba125		5.600
La126	125.919	69	Syn		54s	ε	Ba126	>0	7.600
La127	126.916	70	Syn	11/2-	5.1m	ε	Ba127		4.690
meta state 0.014MeV			Syn	3/2+	3.7m	ε	Ba127		4.705
					3.7m	IT			0.015
La128	127.915	71	Syn	5+	5m	ε	Ba128		6.700
La129	128.9127	72	Syn	3/2+	11.6m	ε	Ba129		3.720
meta state 0.172MeV			Syn	11/2-	0.56s	IT			0.172
La130	129.912	73	Syn	3+	8.7m	ε	Ba130		5.600
La131	130.91	74	Syn	3/2+	59m	ε	Ba131		2.960
La132	131.9101	75	Syn	2-	4.8h	ε	Ba132		4.710
meta state 0.188MeV			Syn	6-	24.3m	IT		76	0.188
					24.3m	ε	Ba132	24	4.898
La133	132.908	76	Syn	5/2+	3.912h	ε	Ba133		2.230
La134	133.9085	77	Syn	1+	6.45m	ε	Ba134		3.710
La135	134.907	78	Syn	5/2+	19.5h	ε	Ba135		1.200
La136	135.9077	79	Syn	1+	9.87m	ε	Ba136		2.870
meta state 0.230MeV			Syn		114ms	IT			0.230
La137	136.9065	80	Syn	7/2+	60000y	ε	Ba137		0.600
La138	137.9071	81	0.09	5+	1.05E¹¹y	ε	Ba138	66.4	1.737
					1.05E¹¹y	β^-	Ce138	33.6	1.044
La139	138.9064	82	99.91	7/2+	Stable
La140	139.9095	83	Syn	3-	1.6781d	β^-	Ce140		3.762
La141	140.911	84	Syn	7/2+	3.92h	β^-	Ce141		2.502
La142	141.9141	85	Syn	2-	91.1m	β^-	Ce142		4.505
La143	142.9161	86	Syn	7/2+	14.2m	β^-	Ce143		3.425
La144	143.9196	87	Syn	3-	40.8s	β^-	Ce144		5.540
La145	144.9216	88	Syn	5/2+	24.8s	β^-	Ce145		4.120
La146	145.9257	89	Syn	2-	6.27s	β^-	Ce146		6.550
meta state 0.000MeV			Syn	6-	10s	β^-	Ce146		6.550
La147	146.9278	90	Syn	2+, 5/2+	4.015s	β^- + N	Ce146	0.04	0.400
					4.015s	β^-	Ce147		4.950
La148	147.932	91	Syn	2-	1.05s	β^- + N	Ce147	0.15	0.950
					1.05s	β^-	Ce148		7.260
La149	148.934	92	Syn		1.05s	β^- + N	Ce148	1.4	1.100
					1.05s	β^-	Ce149		5.500
La150	149.939	93	Syn		0.86s	β^- + N	Ce149	2.7	1.500
					0.86s	β^-	Ce150		7.800
La151	150.942	94	Syn
La152	151.946	95	Syn		>150ns	β^-	Ce152		9.100
La153	152.949	96	Syn		>150ns
La154	153.954	97	Syn
La155	154.958	98	Syn

Nuclide	Potential Parent Nuclides
La117	None known
La118	None known
La119	None known
La120	None known
La121	None known
La122	None known
La123	Ce123 (Syn) Pr124 (Syn)
La124	Ce124 (Syn)
La125	Ce125 (Syn) Pr126 (Syn)
La126	Ce126 (Syn)
La127	Ce127 (Syn) Pr128 (Syn)
meta state 0.014MeV	None known
La128	Ce128 (Syn)
La129	Ce129 (Syn)
meta state 0.172MeV	None known
La130	Ce130 (Syn)
La131	Ce131 (Syn) Ce131m (Syn)
La132	Ce132 (Syn)
meta state 0.188MeV	None known
La133	Ce133 (Syn) Ce133m (Syn)
La134	Ce134 (Syn)
La135	Ce135 (Syn)
La136	None known
meta state 0.230MeV	None known
La137	Ce137 (Syn) Ce137m (Syn)
La138	None known
La139	Ba139 (Syn) Ce139 (Syn)
La140	Ba140 (Syn)
La141	Ba141 (Syn)
La142	Ba142 (Syn)
La143	Ba143 (Syn) Ba144 (Syn)
La144	Ba144 (Syn)
La145	Ba145 (Syn)
La146	Ba146 (Syn) Ba147 (Syn)
meta state 0.000MeV	None known
La147	Ba147 (Syn) Ba148 (Syn)
La148	Ba148 (Syn) Ba149 (Syn)
La149	Ba149 (Syn)
La150	Ba150 (Syn)
La151	None known
La152	None known
La153	None known
La154	None known
La155	None known
Key: NN = Number of Neutrons Abun % = Natural Abundance (as a percentage) Syn = Synthetic Nuclide (does not occur in nature) DM = Decay Mode α = Alpha emission β^- = Beta emission β^- β^- = Double beta decay β⁺ = Positron emission ε = Electron Capture IT = Isomeric Transition N = Neutron emission P = Proton emission SF = Spontaneous Fission DT = Decays To BR % = Branch Ratio (as a percentage)

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References

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Periodic Table of Elements

La - Lanthanum

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Nuclides / Isotopes

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