Lead-215

Properties and data of the isotope ²¹⁵Pb.

Contents

See also: List of individual Lead isotopes (and general data sources).

General data

Name of the isotope:Lead-215; Pb-215Symbol:²¹⁵Pb or 21582PbMass number A:215 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:133Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.6219512195122 (= neutron-proton ratio)Neutron excess (N-Z):51Isotopic mass:215.00466(6) u (atomic weight of Lead-215)Nuclide mass:214.9596816 u (calculated nuclear mass without electrons)Mass excess:4.34076 MeVMass defect:1.789426452 u (per nucleus)Nuclear binding energy:1666.84000348 MeV (per nucleus)
7.7527442 MeV (average binding energy per nucleon)Separation energy:S_N = 3.55(5) MeV (first neutron)
S_P = 9.41(20) MeV (first proton)Half-life:147(12) sDecay constant λ:0.0047152869425847 s^-1Specific activity α:1.320749868058 × 10⁺¹⁹ Bq g^-1
356959423.7997 Ci g^-1Spin and parity:
(nuclear angular momentum)(9/2+)Year of discovery:1998

Radioactive Decay

Half-life T_½ = 147(12) s respectively 1.47 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²¹⁵Bi	100 %	2.71(5) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 133) and isobaric (same nucleon number A = 215) with Lead-215. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 133	Isobar A = 215
80	²¹³Hg	²¹⁵Hg
81	²¹⁴Tl	²¹⁵Tl
82	²¹⁵Pb	²¹⁵Pb
83	²¹⁶Bi	²¹⁵Bi
84	²¹⁷Po	²¹⁵Po
85	²¹⁸At	²¹⁵At
86	²¹⁹Rn	²¹⁵Rn
87	²²⁰Fr	²¹⁵Fr
88	²²¹Ra	²¹⁵Ra
89	²²²Ac	²¹⁵Ac
90	²²³Th	²¹⁵Th
91	²²⁴Pa	²¹⁵Pa
92	²²⁵U	²¹⁵U
93	²²⁶Np