Rhodium-127

Properties and data of the isotope ¹²⁷Rh.

Contents

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

General data

Name of the isotope:Rhodium-127; Rh-127Symbol:¹²⁷Rh or 12745RhMass number A:127 (= number of nucleons)Atomic number Z:45 (= number of protons)Neutrons N:82Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.8222222222222 (= neutron-proton ratio)Neutron excess (N-Z):37Isotopic mass:126.96347(64) u (atomic weight of Rhodium-127)Nuclide mass:126.9387852 u (calculated nuclear mass without electrons)Mass excess:-34.02748 MeVMass defect:1.099179552 u (per nucleus)Nuclear binding energy:1023.87915761 MeV (per nucleus)
8.06204061 MeV (average binding energy per nucleon)Separation energy:S_N = 4.80(78) MeV (first neutron)Half-life:20 msDecay constant λ:34.657359027997 s^-1Specific activity α:1.656440459523 × 10⁺²³ Bq g^-1
4476866106821.1 Ci g^-1Spin and parity:
(nuclear angular momentum)

Radioactive Decay

Half-life T_½ = 20 ms respectively 2.0 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	¹²⁷Pd	100 %	13.15(78) MeV
β^-, n	¹²⁶Pd	?	9.76(72) MeV
β^-, 2n	¹²⁵Pd	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 82) and isobaric (same nucleon number A = 127) with Rhodium-127. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 82	Isobar A = 127
45	¹²⁷Rh	¹²⁷Rh
46	¹²⁸Pd	¹²⁷Pd
47	¹²⁹Ag	¹²⁷Ag
48	¹³⁰Cd	¹²⁷Cd
49	¹³¹In	¹²⁷In
50	¹³²Sn	¹²⁷Sn
51	¹³³Sb	¹²⁷Sb
52	¹³⁴Te	¹²⁷Te
53	¹³⁵I	¹²⁷I
54	¹³⁶Xe	¹²⁷Xe
55	¹³⁷Cs	¹²⁷Cs
56	¹³⁸Ba	¹²⁷Ba
57	¹³⁹La	¹²⁷La
58	¹⁴⁰Ce	¹²⁷Ce
59	¹⁴¹Pr	¹²⁷Pr
60	¹⁴²Nd	¹²⁷Nd
61	¹⁴³Pm	¹²⁷Pm
62	¹⁴⁴Sm
63	¹⁴⁵Eu
64	¹⁴⁶Gd
65	¹⁴⁷Tb
66	¹⁴⁸Dy
67	¹⁴⁹Ho
68	¹⁵⁰Er
69	¹⁵¹Tm
70	¹⁵²Yb
71	¹⁵³Lu
72	¹⁵⁴Hf
73	¹⁵⁵Ta
74	¹⁵⁶W