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Isotopes of Hassium

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

 

Hassium isotopes

 

Isotope Table: Hassium

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
263Hs108263155Hassium-263263.12848(13) u
[263.0692431 u]
{119.67835 MeV}
3/2+
264Hs108264156Hassium-264264.12836(3) u
[264.0691231 u]
{119.56657 MeV}
0+
265Hs108265157Hassium-265265.129792(26) u
[265.0705551 u]
{120.90047 MeV}
9/2+
265mHs108265157Hassium-265m265.129792(26) u
[265.0705551 u]
{120.90047 MeV}
3/2+
266Hs108266158Hassium-266266.13005(4) u
[266.0708131 u]
{121.14079 MeV}
0+
267Hs108267159Hassium-267267.13167(10) u
[267.0724331 u]
{122.64981 MeV}
5/2+
267mHs108267159Hassium-267m267.13167(10) u
[267.0724331 u]
{122.64981 MeV}
9-
268Hs108268160Hassium-268268.13186(30) u
[268.0726231 u]
{122.8268 MeV}
0+
269Hs108269161Hassium-269269.13372(13) u
[269.0744831 u]
{124.55938 MeV}
9/2+
270Hs108270162Hassium-270270.13431(27) u
[270.0750731 u]
{125.10896 MeV}
0+
271Hs108271163Hassium-271271.13717(32) u
[271.0779331 u]
{127.77303 MeV}
272Hs108272164Hassium-272
273Hs108273165Hassium-273273.14159(39) u
[273.0823531 u]
{131.89024 MeV}
3/2+
274Hs108274166Hassium-274
275Hs108275167Hassium-275275.14667(63) u
[275.0874331 u]
{136.62222 MeV}
276Hs108276168Hassium-276
277Hs108277169Hassium-277277.15190(58) u
[277.0926631 u]
{141.49394 MeV}
3/2+
277mHs108277169Hassium-277m277.15190(58) u
[277.0926631 u]
{141.49394 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
Hs-2630.76 msα → 259Sg≤ 100 %10.73(5) MeVAL
Hs-2640.8 msα → 260Sg
SF div
ca. 50 %
ca. 50 %
10.591(20) MeV
AL
Hs-2652.0 msα → 261Sg
SF div
ca. 100 %
≤ 1 %
10.470(15) MeV
AL
Hs-265m0.75 msα → 261Sg
SF diverse
ca. 100 %
≤ 1 %

300 keVAL
Hs-2662.97 msα → 262Sg
SF div
76(9) %
24(9) %
10.346(16) MeV
AL
Hs-26752 msα → 263Sg
SF div
≥ 80 %
< 20 %
10.038(13) MeV
AL
Hs-267m990(90) μsα → 263SgAL
Hs-2680.4(+18-2) sα → 264Sgca. 100 %9.623(16) MeVAL
Hs-2699.7(+97-33) sα → 265Sgca. 100 %9.34(16) MeVxAL
Hs-2707.6 sα → 266Sg
SF div
> 50 %
< 50 %
9.07(4) MeV
AL
Hs-2714 sα → 267SgAL
Hs-272AL
Hs-2730.76(+71-24) sα → 269Sgca. 100 %9.70(5) MeVAL
Hs-274AL
Hs-2750.15(+27-6) sα → 271Sgca. 100 %9.44(5) MeVxAL
Hs-276AL
Hs-2773(+15-1) msSF 100 %AL
Hs-277m0.6(+27-3) minSF 100 %+x keVAL

 

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 Hassium isotope.
6 - Relative atomic mass of the Hassium 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 Hassium 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 Hassium 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.

Hassium: 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.

 


Category: Isotopes

Last update: 05.07.2020



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