Neodymium-135m

Properties and data of the isotope ^135mNd.

Contents

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

General data

Name of the isotope:Neodymium-135m; Nd-135mSymbol:^135mNd or 135m60NdMass number A:135 (= number of nucleons)Atomic number Z:60 (= number of protons)Neutrons N:75Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.25 (= neutron-proton ratio)Neutron excess (N-Z):15Excitation energy:64.95(24) keVIsotopic mass:134.918181(21) u (atomic weight of Neodymium-135m)Nuclide mass:134.8852687 u (calculated nuclear mass without electrons)Mass excess:-76.21391 MeVMass defect:1.20118962 u (per nucleus)Nuclear binding energy:1118.90092389 MeV (per nucleus)
8.28815499 MeV (average binding energy per nucleon)Half-life:5.5(5) minDecay constant λ:0.0021004460016968 s^-1Specific activity α:9.439687829036 × 10⁺¹⁸ Bq g^-1
255126698.08207 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2+)

Radioactive Decay

Half-life T_½ = 5.5(5) min (minutes) respectively 3.30 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	¹³⁵Pr	> 99.97 %
Iso	¹³⁵Nd	< 0.03 %

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
¹³⁵Nd		12.4(6) min	9/2(-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 75) and isobaric (same nucleon number A = 135) with Neodymium-135m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 75	Isobar A = 135
42	¹¹⁷Mo
43	¹¹⁸Tc
44	¹¹⁹Ru
45	¹²⁰Rh
46	¹²¹Pd
47	¹²²Ag
48	¹²³Cd
49	¹²⁴In	¹³⁵In
50	¹²⁵Sn	¹³⁵Sn
51	¹²⁶Sb	¹³⁵Sb
52	¹²⁷Te	¹³⁵Te
53	¹²⁸I	¹³⁵I
54	¹²⁹Xe	¹³⁵Xe
55	¹³⁰Cs	¹³⁵Cs
56	¹³¹Ba	¹³⁵Ba
57	¹³²La	¹³⁵La
58	¹³³Ce	¹³⁵Ce
59	¹³⁴Pr	¹³⁵Pr
60	¹³⁵Nd	¹³⁵Nd
61	¹³⁶Pm	¹³⁵Pm
62	¹³⁷Sm	¹³⁵Sm
63	¹³⁸Eu	¹³⁵Eu
64	¹³⁹Gd	¹³⁵Gd
65	¹⁴⁰Tb	¹³⁵Tb
66	¹⁴¹Dy
67	¹⁴²Ho
68	¹⁴³Er
69	¹⁴⁴Tm