Antimony-127m2

Properties and data of the isotope ¹²⁷Sb.

Content

General data

Name of the isotope:Antimony-127m2; Sb-127m2Symbol:¹²⁷Sb or 12751SbMass number A:127 (= number of nucleons)Atomic number Z:51 (= number of protons)Neutrons N:76Isotopic mass:126.906924(6) u (atomic weight of Antimony-127m2)
Excitation energy: 2324.7(4) keVNuclide mass:126.8789481 u (calculated nuclear mass without electrons)Mass excess:-86.69974 MeVMass defect:1.150686248 u (per nucleus)Nuclear binding energy:1071.85733589 MeV (per nucleus)
8.43982154 MeV (average binding energy per nucleon)Half-life:0.165(20) μsDecay constant λ:4200892.0033936 s^-1Specific activity α:2.007806617604 × 10⁺²⁸ Bq g^-1
5.426504371904 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)

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
¹²⁷Sb		3.85(5) d	7/2+
^127m1Sb	1920.19(21) keV	11(7) μs	(15/2-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 76) and isobaric (same nucleon number A = 127) with Antimony-127m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 76	Isobar A = 127
42	¹¹⁸Mo
43	¹¹⁹Tc
44	¹²⁰Ru
45	¹²¹Rh	¹²⁷Rh
46	¹²²Pd	¹²⁷Pd
47	¹²³Ag	¹²⁷Ag
48	¹²⁴Cd	¹²⁷Cd
49	¹²⁵In	¹²⁷In
50	¹²⁶Sn	¹²⁷Sn
51	¹²⁷Sb	¹²⁷Sb
52	¹²⁸Te	¹²⁷Te
53	¹²⁹I	¹²⁷I
54	¹³⁰Xe	¹²⁷Xe
55	¹³¹Cs	¹²⁷Cs
56	¹³²Ba	¹²⁷Ba
57	¹³³La	¹²⁷La
58	¹³⁴Ce	¹²⁷Ce
59	¹³⁵Pr	¹²⁷Pr
60	¹³⁶Nd	¹²⁷Nd
61	¹³⁷Pm	¹²⁷Pm
62	¹³⁸Sm
63	¹³⁹Eu
64	¹⁴⁰Gd
65	¹⁴¹Tb
66	¹⁴²Dy
67	¹⁴³Ho
68	¹⁴⁴Er
69	¹⁴⁵Tm