Rutherfordium-256
Properties and data of the isotope 256Rf.
See also: list of Rutherfordium isotopes.
General data
Name of the isotope:Rutherfordium-256; Rf-256Symbol:256Rf or 256104RfMass number A:256 (= number of nucleons)Atomic number Z:104 (= number of protons)Neutrons N:152Isotopic mass:256.101152(19) u (atomic weight of Rutherfordium-256)Nuclide mass:256.0441086 u (calculated nuclear mass without electrons)Mass excess:94.22248 MeVMass defect:2.02971856 u (per nucleus)Nuclear binding energy:1890.67066033 MeV (per nucleus)
7.38543227 MeV (average binding energy per nucleon)Separation energy:SN = 8.18(12) MeV (first neutron)
SP = 3.014(25) MeV (first proton)Half-life:6.67(10) msDecay constant λ:103.92011702548 s-1Specific activity α:2.444615558236 × 10+23 Bq g-1
6607069076314.9 Ci g-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1975
Radioactive Decay
Half-life T½ = 6.67(10) ms respectively 6.67 × 10-3 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
α | 252No | 0.32(17) % | 8.926(15) MeV | |
SZ | div | 99.68(17) % | | |
Parent Nuclides
Direct parent isotope is: 260Sg.
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
Nuclear Isomer | Excitation Energy | Half-life | Spin |
---|
256m1Rf | 1120 keV | 25(2) μs | (5-) |
256m2Rf | 1400 keV | 17(2) μs | (8-) |
256m3Rf | 2200 keV | 27(5) μs | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 152) and isobaric (same nucleon number A = 256) with Rutherfordium-256. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 152 | Isobar A = 256 |
94 | 246Pu | |
95 | 247Am | |
96 | 248Cm | |
97 | 249Bk | |
98 | 250Cf | 256Cf |
99 | 251Es | 256Es |
100 | 252Fm | 256Fm |
101 | 253Md | 256Md |
102 | 254No | 256No |
103 | 255Lr | 256Lr |
104 | 256Rf | 256Rf |
105 | 257Db | 256Db |
106 | 258Sg | |
External data and identifiers
Last update: 2020-11-04
Perma link: https://www.chemlin.org/isotope/rutherfordium-256
© 1996 - 2024 ChemLin