About   |   More   |   Search

Isotopes of Lawrencium

List, data and properties of all known isotopes of Lawrencium as well as radioactive decay products and intermediate products.

 

Lawrencium isotopes

Lawrencium is an exclusively artificially produced radioactive chemical element that is not known in nature.

With 258Lr, the first lawrencium isotope was discovered in 1961 by the research team led by Albert Ghiorso at the Lawrence Berkeley National Laboratory University of California.

To date, a total of 11 different isotopes have been produced, all of which are extremely short-lived; with a half-life of about 4 hours, Lawrencium-262 is the most stable Lr nuclide. It is expected that heavier lawrencium nuclides may have longer half-lives.

 

Isotope Table: Lawrencium

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
252Lr103252149Lawrencium-252252.09526(25) u
[252.038765 u]
{88.73412 MeV}
256Db
253Lr103253150Lawrencium-253253.09509(22) u
[253.038595 u]
{88.57576 MeV}
(7/2-)257Db
253mLr103253150Lawrencium-253m253.09509(22) u
[253.038595 u]
{88.57576 MeV}
(1/2-)
254Lr103254151Lawrencium-254254.09648(32) u
[254.039985 u]
{89.87054 MeV}
258Db
255Lr103255152Lawrencium-255255.096562(19) u
[255.040067 u]
{89.94692 MeV}
(1/2-)
255m1Lr103255152Lawrencium-255m1255.096562(19) u
[255.040067 u]
{89.94692 MeV}
(7/2-)
256Lr103256153Lawrencium-256256.09849(9) u
[256.041995 u]
{91.74284 MeV}
260Db
257Lr103257154Lawrencium-257257.09948(5) u
[257.042985 u]
{92.66502 MeV}
9/2+261Db
258Lr103258155Lawrencium-258258.10175(11) u
[258.045255 u]
{94.77951 MeV}
262Db
259Lr103259156Lawrencium-259259.10290(8) u
[259.046405 u]
{95.85073 MeV}
(9/2+)263Db
260Lr103260157Lawrencium-260260.10550(13) u
[260.049005 u]
{98.27262 MeV}
261Lr103261158Lawrencium-261261.10688(21) u
[261.050385 u]
{99.55808 MeV}
262Lr103262159Lawrencium-262262.10961(21) u
[262.053115 u]
{102.10106 MeV}
263Lr103263160Lawrencium-263
264Lr103264161Lawrencium-264
265Lr103265162Lawrencium-265
266Lr103266163Lawrencium-266266.11983(63) u
[266.063335 u]
{111.62093 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
Lr-2520.36 sEC/β+252No
α → 248Md
SF div.
?
?
?
5.87(24) MeV
9.164(17) MeV
AL
Lr-2530.57 sα → 249Md
SF div.
98.7 %
1.3 %
8.918(20) MeV
AL
Lr-253m1.49 sα → 249Md
SF div.
92(5) %
8(5) %

AL
Lr-25418.1(18) sEC/β+254No
α → 250Md
SF div.
28.3(19) %
71.7(19) %
< 0.1 %
5.15(30) MeV
8.816(12) MeV
AL
Lr-25531.1(11) sα → 251Md
EC → 255No
SF div.
99.7(1) %
< 0.3(1) %
< 0.1 %
8.556(7) MeV
3.140(23) MeV
AL
Lr-255m12.54(5) sIso → 255Lr
α → 251Md
ca. 60 %
ca. 40 %

38(10) keV
Lr-25627.9 sEC/β+256No
α → 253Md
SF div.
15(10) %
85(10) %
< 0.03 %
3.92(8) MeV
8.81(10) MeV
AL
Lr-2574 sα → 253Md
EC → 257No
SF div.
< 100 %
< 15 %
< 0.033 %
9.07(3) MeV
2.42(4) MeV
AL
Lr-2583.92(33) sα → 254Md
EC → 258No
97.4(18) %
2.6 (18)
8.904(19) MeV
3.30(14) MeV
AL
Lr-2596.2(3) sα → 255Md
SF div.
78(2) %
22(2) %
8.58(7)
AL
Lr-260180(30) sα → 256Md
EC → 260No
80(20) %
< 40 %
8.40(14) MeV
2.66(24) MeV
AL
Lr-26139(12) minSF div.?AL
Lr-2624 hSF div.
EC/β+262No
α → 258Md
< 10 %
?
?

2.00(41) MeV
7.99(20) MeV
AL
Lr-263gibt es nichtAL
Lr-264unbekanntAL
Lr-265unbekanntAL
Lr-26611 hSF div.100 %AL

 

Notes (related to the columns):

1 - nuclide, isotope symbol.
2 - Z = number of protons (atomic number).
3 - Mass number A.
4 - N = number of neutrons.
5 - Identification of the Lawrencium isotope.
6 - Relative atomic mass of the Lawrencium isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to 12C = 12.00000 [2]. In addition, the mass excess is given in MeV.
7 - Nuclear spin I, unit: h/2π.
8 - Nuclear magnetic moment μmag.
9 - Source nuclides: Possible, assumed or actual source nuclides (mother nuclides, parent nuclides). If applicable, the corresponding decay modes can be found in the data for the respective starting nuclide.
10 - Decay: Half-live of the Lawrencium isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
11 - Decay: type of decay into the respective daughter nuclides with n = neutron emission; p = proton emission; α = alpha decay; β- = beta minus decay with electron emission; EC = electron capture; β+ = positron emission; ε = β+ and/or EC; Iso = isomeric transition; CD = cluster decay; SF = spontaneous decay.
12 - Decay percentage in percent (%).
13 - Decay energy; Particle energy related to decay type.
14 - AE = Excitation energy for metastable nuclei.
15 - Other information and notes: AL = Adopted Levels (link to external data [1]).

Miscellaneous:

()- Numbers in brackets: uncertainty to represent the spread of the reported value.
~ - Theoretical values or systematic trends.
  - unlisted-: Nuclides that have already been mentioned in the literature but for some reason can no longer be found in the current nuclide tables because their discovery e.g. has not confirmed.

 

Literature Sources and References

Properties of the Lawrencium nucleides

[1] - NuDat: National Nuclear Data Center, Brookhaven National Laboratory, based on ENSDF and the Nuclear Wallet Cards.

[2] - G. Audi et. al.: The NUBASE evaluation of nuclear and decay properties. Nuclear Physics, (2003), DOI 10.1016/j.nuclphysa.2003.11.001.

[3] - Live Chart of Nuclides. Nuclear structure and decay data.

Lawrencium: NMR properties

[4] - N. J. Stone: Table of nuclear magnetic dipole and electric quadrupole moments. Atomic Data and Nuclear Data Tables, (2005), DOI 10.1016/j.adt.2005.04.001.

[5] - Pekka Pyykkö: Year-2008 nuclear quadrupole moments. Molecular Physics, (2008), DOI 10.1080/00268970802018367.

[6] - Pekka Pyykkö: Year-2017 nuclear quadrupole moments. Molecular Physics, (2018), DOI 10.1080/00268976.2018.1426131.

[7] - N. J. Stone: Table of recommended nuclear magnetic dipole moments. IAEA, (2019).

More sources:

[8] - Isotopic abundances, atomic weights and isotopic masses: see respective keyword.

[9] - J. Khuyagbaatar et al.:
48Ca + 249Bk Fusion Reaction Leading to Element Z = 117: Long-Lived α-Decaying 270Db and Discovery of 266Lr.
In: Physical Review Letters, (2014), DOI 10.1103/PhysRevLett.112.172501.

 


Category: Isotopes

Last update: 05.07.2020



© 1996 - 2022 Internetchemistry




I agree!

This site uses cookies. By using this website, you agree to the use of cookies! Learn more ...