Rubidium-101

Properties and data of the isotope ¹⁰¹Rb.

Contents

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

General data

Name of the isotope:Rubidium-101; Rb-101Symbol:¹⁰¹Rb or 10137RbMass number A:101 (= number of nucleons)Atomic number Z:37 (= number of protons)Neutrons N:64Isotopic mass:100.95400(21) u (atomic weight of Rubidium-101)Nuclide mass:100.9337033 u (calculated nuclear mass without electrons)Mass excess:-42.84872 MeVMass defect:0.89008080800001 u (per nucleus)Nuclear binding energy:829.10493217 MeV (per nucleus)
8.20895972 MeV (average binding energy per nucleon)Separation energy:S_N = 4.67(20) MeV (first neutron)
S_P = 15.08(45) MeV (first proton)Half-life:32(5) msDecay constant λ:21.660849392498 s^-1Specific activity α:1.30444686187 × 10⁺²³ Bq g^-1
3525532059121.6 Ci g^-1Spin and parity:
(nuclear angular momentum)(3/2+)Year of discovery:1992

Radioactive Decay

Half-life T_½ = 32(5) ms respectively 3.2 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁰¹Sr	72(4) %	12.48(20) MeV
β^-, n	¹⁰⁰Sr	28(4) %	8.90(20) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 64) and isobaric (same nucleon number A = 101) with Rubidium-101. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 64	Isobar A = 101
36	¹⁰⁰Kr	¹⁰¹Kr
37	¹⁰¹Rb	¹⁰¹Rb
38	¹⁰²Sr	¹⁰¹Sr
39	¹⁰³Y	¹⁰¹Y
40	¹⁰⁴Zr	¹⁰¹Zr
41	¹⁰⁵Nb	¹⁰¹Nb
42	¹⁰⁶Mo	¹⁰¹Mo
43	¹⁰⁷Tc	¹⁰¹Tc
44	¹⁰⁸Ru	¹⁰¹Ru
45	¹⁰⁹Rh	¹⁰¹Rh
46	¹¹⁰Pd	¹⁰¹Pd
47	¹¹¹Ag	¹⁰¹Ag
48	¹¹²Cd	¹⁰¹Cd
49	¹¹³In	¹⁰¹In
50	¹¹⁴Sn	¹⁰¹Sn
51	¹¹⁵Sb
52	¹¹⁶Te
53	¹¹⁷I
54	¹¹⁸Xe
55	¹¹⁹Cs
56	¹²⁰Ba
57	¹²¹La
58	¹²²Ce
59	¹²³Pr
60	¹²⁴Nd