Neodymium-137m

Properties and data of the isotope ^137mNd.

Contents

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

General data

Name of the isotope:Neodymium-137m; Nd-137mSymbol:^137mNd or 137m60NdMass number A:137 (= number of nucleons)Atomic number Z:60 (= number of protons)Neutrons N:77Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.2833333333333 (= neutron-proton ratio)Neutron excess (N-Z):17Excitation energy:519.43(20) keVIsotopic mass:136.914562(13) u (atomic weight of Neodymium-137m)Nuclide mass:136.8816497 u (calculated nuclear mass without electrons)Mass excess:-79.58498 MeVMass defect:1.222138452 u (per nucleus)Nuclear binding energy:1138.41463521 MeV (per nucleus)
8.30959588 MeV (average binding energy per nucleon)Half-life:1.60(15) sDecay constant λ:0.43321698784997 s^-1Specific activity α:1.918304208639 × 10⁺²¹ Bq g^-1
51846059692.965 Ci g^-1Spin and parity:
(nuclear angular momentum)11/2-

Radioactive Decay

Half-life T_½ = 1.60(15) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹³⁷Nd	100 %

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
¹³⁷Nd		38.5(15) min	1/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 77) and isobaric (same nucleon number A = 137) with Neodymium-137m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 77	Isobar A = 137
43	¹²⁰Tc
44	¹²¹Ru
45	¹²²Rh
46	¹²³Pd
47	¹²⁴Ag
48	¹²⁵Cd
49	¹²⁶In	¹³⁷In
50	¹²⁷Sn	¹³⁷Sn
51	¹²⁸Sb	¹³⁷Sb
52	¹²⁹Te	¹³⁷Te
53	¹³⁰I	¹³⁷I
54	¹³¹Xe	¹³⁷Xe
55	¹³²Cs	¹³⁷Cs
56	¹³³Ba	¹³⁷Ba
57	¹³⁴La	¹³⁷La
58	¹³⁵Ce	¹³⁷Ce
59	¹³⁶Pr	¹³⁷Pr
60	¹³⁷Nd	¹³⁷Nd
61	¹³⁸Pm	¹³⁷Pm
62	¹³⁹Sm	¹³⁷Sm
63	¹⁴⁰Eu	¹³⁷Eu
64	¹⁴¹Gd	¹³⁷Gd
65	¹⁴²Tb	¹³⁷Tb
66	¹⁴³Dy
67	¹⁴⁴Ho
68	¹⁴⁵Er
69	¹⁴⁶Tm