Isotopes of lanthanum
Template:Short description Template:Infobox lanthanum isotopes
Naturally occurring lanthanum (57La) is composed of one stable (139La) and one radioactive (138La) isotope, with the stable isotope, 139La, being the most abundant (99.91% natural abundance). There are 39 radioisotopes that have been characterized, with the most stable being 138La, with a half-life of 1.03×1011 years; 137La, with a half-life of 60,000 years and 140La, with a half-life of 1.6781 days. The remaining radioactive isotopes have half-lives that are less than a day and the majority of these have half-lives that are less than 1 minute. This element also has 12 nuclear isomers, the longest-lived of which is 132mLa, with a half-life of 24.3 minutes. Lighter isotopes mostly decay to isotopes of barium and heavy ones mostly decay to isotopes of cerium. 138La can decay to both.
The isotopes of lanthanum range in atomic weight from Script error: No such module "val". (116La) to Script error: No such module "val". (155La).
List of isotopes
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Template:Isotopes table |-id=Lanthanum-116 | rowspan=2|116La[1] | rowspan=2 style="text-align:right" | 57 | rowspan=2 style="text-align:right" | 59 | rowspan=2|115.95701(35)# | rowspan=2|50(22) ms | p (~60%) | 115Ba | rowspan=2| | rowspan=2| | rowspan=2| |- | β+ (~40%) | 116Ba |-id=Lanthanum-116m | style="text-indent:1em" | 116mLa[1] | colspan="3" style="text-indent:2em" | 182 keV | Script error: No such module "val". | IT | 116La | | | |-id=Lanthanum-117 | rowspan=2|117La[1] | rowspan=2 style="text-align:right" | 57 | rowspan=2 style="text-align:right" | 60 | rowspan=2|116.95033(22)# | rowspan=2|21.6(31) ms | p (94%) | 116Ba | rowspan=2|(3/2+) | rowspan=2| | rowspan=2| |- | β+ (6%) | 117Ba |-id=Lanthanum-117m | style="text-indent:1em" | 117mLa[1] | colspan="3" style="text-indent:2em" | 192 keV | Script error: No such module "val". | IT | 117La | (7/2−) | | |-id=Lanthanum-120 | rowspan=2|120La | rowspan=2 style="text-align:right" | 57 | rowspan=2 style="text-align:right" | 63 | rowspan=2|119.93820(32)# | rowspan=2|2.8(2) s | β+ | 120Ba | rowspan=2|4+[2] | rowspan=2| | rowspan=2| |- | β+, p (?%) | 119Cs |-id=Lanthanum-121 | 121La | style="text-align:right" | 57 | style="text-align:right" | 64 | 120.93324(32)# | 5.3(2) s | β+ | 121Ba | 11/2−# | | |-id=Lanthanum-122 | rowspan=2|122La | rowspan=2 style="text-align:right" | 57 | rowspan=2 style="text-align:right" | 65 | rowspan=2|121.93071(32)# | rowspan=2|8.6(5) s | β+ | 122Ba | rowspan=2|2+[2] | rowspan=2| | rowspan=2| |- | β+, p (?%) | 121Cs |-id=Lanthanum-123 | 123La | style="text-align:right" | 57 | style="text-align:right" | 66 | 122.92630(21)# | 17(3) s | β+ | 123Ba | 11/2−# | | |-id=Lanthanum-124 | 124La | style="text-align:right" | 57 | style="text-align:right" | 67 | 123.924574(61) | 29.21(17) s | β+ | 124Ba | (7−, 8−) | | |-id=Lanthanum-124m | style="text-indent:1em" | 124mLa[n 1] | colspan="3" style="text-indent:2em" | 100(100)# keV | 21(4) s | β+ | 124Ba | 2−# | | |-id=Lanthanum-125 | 125La | style="text-align:right" | 57 | style="text-align:right" | 68 | 124.920816(28) | 64.8(12) s | β+ | 125Ba | 11/2−# | | |-id=Lanthanum-125m | style="text-indent:1em" | 125mLa | colspan="3" style="text-indent:2em" | 107.00(10) keV | 390(40) ms | IT | 125La | (3/2+) | | |-id=Lanthanum-126 | 126La | style="text-align:right" | 57 | style="text-align:right" | 69 | 125.919513(97) | 54(2) s | β+ | 126Ba | 5−# | | |-id=Lanthanum-126m | style="text-indent:1em" | 126mLa[n 1] | colspan="3" style="text-indent:2em" | 210(410) keV | 20(20) s | β+ | 126Ba | 1−# | | |-id=Lanthanum-127 | 127La | style="text-align:right" | 57 | style="text-align:right" | 70 | 126.916375(28) | 5.1(1) min | β+ | 127Ba | (11/2−) | | |-id=Lanthanum-127m | style="text-indent:1em" | 127mLa | colspan="3" style="text-indent:2em" | 14.2(4) keV | 3.7(4) min | β+ | 127Ba | (3/2+) | | |-id=Lanthanum-128 | 128La | style="text-align:right" | 57 | style="text-align:right" | 71 | 127.915592(58) | 5.18(14) min | β+ | 128Ba | (5+) | | |-id=Lanthanum-128m | style="text-indent:1em" | 128mLa[n 1] | colspan="3" style="text-indent:2em" | 100(100)# keV | < 1.4 min | β+ | 128Ba | (1+, 2−) | | |-id=Lanthanum-129 | 129La | style="text-align:right" | 57 | style="text-align:right" | 72 | 128.912696(23) | 11.6(2) min | β+ | 129Ba | (3/2+) | | |-id=Lanthanum-129m | style="text-indent:1em" | 129mLa | colspan="3" style="text-indent:2em" | 172.33(20) keV | 560(50) ms | IT | 129La | (11/2−) | | |-id=Lanthanum-130 | 130La | style="text-align:right" | 57 | style="text-align:right" | 73 | 129.912369(28) | 8.7(1) min | β+ | 130Ba | 3(+) | | |-id=Lanthanum-130m | style="text-indent:1em" | 130mLa | colspan="3" style="text-indent:2em" | 214.0(5) keV | 742(28) ns | IT | 130La | (5+) | | |-id=Lanthanum-131 | 131La | style="text-align:right" | 57 | style="text-align:right" | 74 | 130.910070(30) | 59(2) min | β+ | 131Ba | 3/2+ | | |-id=Lanthanum-131m | style="text-indent:1em" | 131mLa | colspan="3" style="text-indent:2em" | 304.52(24) keV | 170(10) μs | IT | 131La | 11/2− | | |-id=Lanthanum-132 | 132La | style="text-align:right" | 57 | style="text-align:right" | 75 | 131.910119(39) | 4.59(4) h | β+ | 132Ba | 2− | | |-id=Lanthanum-132m | rowspan=2 style="text-indent:1em" | 132mLa | rowspan=2 colspan="3" style="text-indent:2em" | 188.20(11) keV | rowspan=2|24.3(5) min | IT (76%) | 132La | rowspan=2|6− | rowspan=2| | rowspan=2| |- | β+ (24%) | 132Ba |-id=Lanthanum-133 | 133La | style="text-align:right" | 57 | style="text-align:right" | 76 | 132.908218(30) | 3.912(8) h | β+ | 133Ba | 5/2+ | | |-id=Lanthanum-134 | 134La | style="text-align:right" | 57 | style="text-align:right" | 77 | 133.908514(21) | 6.45(16) min | β+ | 134Ba | 1+ | | |-id=Lanthanum-134m | style="text-indent:1em" | 134mLa | colspan="3" style="text-indent:2em" | 440(100)# keV | 29(4) μs | IT | 134La | (6−) | | |-id=Lanthanum-135 | 135La | style="text-align:right" | 57 | style="text-align:right" | 78 | 134.906984(10) | 18.91(2) h | β+ | 135Ba | 5/2+ | | |-id=Lanthanum-136 | 136La | style="text-align:right" | 57 | style="text-align:right" | 79 | 135.907635(57) | 9.87(3) min | β+ | 136Ba | 1+ | | |-id=Lanthanum-136m1 | style="text-indent:1em" | 136m1La | colspan="3" style="text-indent:2em" | 259.5(3) keV | 114(5) ms | IT | 136La | (7−) | | |-id=Lanthanum-136m2 | style="text-indent:1em" | 136m2La | colspan="3" style="text-indent:2em" | 2520.6(4) keV | 187(27) ns | IT | 136La | (14+) | | |-id=Lanthanum-137 | 137La | style="text-align:right" | 57 | style="text-align:right" | 80 | 136.9064504(18) | 6(2)×104 y | EC | 137Ba | 7/2+ | | |-id=Lanthanum-137m | style="text-indent:1em" | 137mLa | colspan="3" style="text-indent:2em" | 1869.50(21) keV | 342(25) ns | IT | 137La | 19/2− | | |-id=Lanthanum-138 | rowspan=2|138La[n 2] | rowspan=2 style="text-align:right" | 57 | rowspan=2 style="text-align:right" | 81 | rowspan=2|137.90712404(45) | rowspan=2|1.03(1)×1011 y | β+ (65.5%) | 138Ba | rowspan=2|5+ | rowspan=2|8.881(71)×10−4 | rowspan=2| |- | β− (34.5%) | 138Ce |-id=Lanthanum-138m1 | style="text-indent:1em" | 138m1La | colspan="3" style="text-indent:2em" | 72.57(3) keV | 116(5) ns | IT | 138La | (3)+ | | |-id=Lanthanum-138m2 | style="text-indent:1em" | 138m2La | colspan="3" style="text-indent:2em" | 738.80(20) keV | 2.0(3) μs | IT | 138La | 7− | | |-id=Lanthanum-139 | 139La[n 3] | style="text-align:right" | 57 | style="text-align:right" | 82 | 138.90636293(65) | colspan=3 align=center|Stable | 7/2+ | 0.9991119(71) | |-id=Lanthanum-139m | style="text-indent:1em" | 139mLa | colspan="3" style="text-indent:2em" | 1800.4(4) keV | 315(35) ns | IT | 139La | (17/2+) | | |-id=Lanthanum-140 | 140La[n 3] | style="text-align:right" | 57 | style="text-align:right" | 83 | 139.90948729(65) | 40.289(4) h | β− | 140Ce | 3− | | |-id=Lanthanum-141 | 141La | style="text-align:right" | 57 | style="text-align:right" | 84 | 140.9109712(44) | 3.92(3) h | β− | 141Ce | (7/2+) | | |-id=Lanthanum-142 | 142La | style="text-align:right" | 57 | style="text-align:right" | 85 | 141.9140908(67) | 91.1(5) min | β− | 142Ce | 2− | | |-id=Lanthanum-142m | style="text-indent:1em" | 142mLa | colspan="3" style="text-indent:2em" | 145.82(8) keV | 0.87(17) μs | IT | 142La | (4)− | | |-id=Lanthanum-143 | 143La | style="text-align:right" | 57 | style="text-align:right" | 86 | 142.9160795(79) | 14.2(1) min | β− | 143Ce | (7/2)+ | | |-id=Lanthanum-144 | 144La | style="text-align:right" | 57 | style="text-align:right" | 87 | 143.919646(14) | 44.0(7) s | β− | 144Ce | (3−) | | |-id=Lanthanum-145 | 145La | style="text-align:right" | 57 | style="text-align:right" | 88 | 144.921808(13) | 24.8(20) s | β− | 145Ce | (5/2+) | | |-id=Lanthanum-146 | 146La | style="text-align:right" | 57 | style="text-align:right" | 89 | 145.9256880(18) | 9.9(1) s | β− | 146Ce | (5−) | | |-id=Lanthanum-146m | style="text-indent:1em" | 146mLa | colspan="3" style="text-indent:2em" | 141.5(24) keV | 6.08(22) s | β− | 146Ce | (1−, 2−) | | |-id=Lanthanum-147 | rowspan=2|147La | rowspan=2 style="text-align:right" | 57 | rowspan=2 style="text-align:right" | 90 | rowspan=2|146.928418(12) | rowspan=2|4.026(20) s | β− (99.96%) | 147Ce | rowspan=2|(5/2+) | rowspan=2| | rowspan=2| |- | β−, n (0.041%) | 146Ce |-id=Lanthanum-148 | rowspan=2|148La | rowspan=2 style="text-align:right" | 57 | rowspan=2 style="text-align:right" | 91 | rowspan=2|147.932679(21) | rowspan=2|1.414(25) s | β− (99.82%) | 148Ce | rowspan=2|(2−) | rowspan=2| | rowspan=2| |- | β−, n (0.18%) | 147Ce |-id=Lanthanum-149 | rowspan=2|149La | rowspan=2 style="text-align:right" | 57 | rowspan=2 style="text-align:right" | 92 | rowspan=2|148.93535(21) | rowspan=2|1.071(22) s | β− (98.57%) | 149Ce | rowspan=2|(3/2−) | rowspan=2| | rowspan=2| |- | β−, n (1.43%) | 148Ce |-id=Lanthanum-150 | rowspan=2|150La | rowspan=2 style="text-align:right" | 57 | rowspan=2 style="text-align:right" | 93 | rowspan=2|149.9395475(27) | rowspan=2|504(15) ms | β− (97.3%) | 150Ce | rowspan=2|(3+) | rowspan=2| | rowspan=2| |- | β−, n (2.7%) | 149Ce |-id=Lanthanum-151 | 151La | style="text-align:right" | 57 | style="text-align:right" | 94 | 150.94277(47) | 465(24) ms | β− | 151Ce | 1/2+# | | |-id=Lanthanum-152 | 152La | style="text-align:right" | 57 | style="text-align:right" | 95 | 151.94709(32)# | 287(16) ms | β− | 152Ce | 2−# | | |-id=Lanthanum-153 | 153La | style="text-align:right" | 57 | style="text-align:right" | 96 | 152.95055(32)# | 245(18) ms | β− | 153Ce | 1/2+# | | |-id=Lanthanum-154 | 154La | style="text-align:right" | 57 | style="text-align:right" | 97 | 153.95542(32)# | 161(15) ms | β− | 154Ce | 2−# | | |-id=Lanthanum-155 | 155La | style="text-align:right" | 57 | style="text-align:right" | 98 | 154.95928(43)# | 101(28) ms | β− | 155Ce | 1/2+# | | |-id=Lanthanum-156 | 156La | style="text-align:right" | 57 | style="text-align:right" | 99 | 155.96452(43)# | 84(78) ms | β− | 156Ce | 4+# | | |-id=Lanthanum-157 | 157La | style="text-align:right" | 57 | style="text-align:right" | 100 | 156.96879(32)# | 30# msScript error: No such module "string".[> 550 ns] | | | 1/2+# | | Template:Isotopes table/footer
See also
Daughter products other than lanthanum
References
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- Isotope masses from:
- Isotopic compositions and standard atomic masses from:
- Half-life, spin, and isomer data selected from the following sources.
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