Neodymium-131

Properties and data of the isotope ¹³¹Nd.

Content

General data

Name of the isotope:Neodymium-131; Nd-131Symbol:¹³¹Nd or 13160NdMass number A:131 (= number of nucleons)Atomic number Z:60 (= number of protons)Neutrons N:71Isotopic mass:130.92725(3) u (atomic weight of Neodymium-131)Nuclide mass:130.8943377 u (calculated nuclear mass without electrons)Mass excess:-67.76619 MeVMass defect:1.157460956 u (per nucleus)Nuclear binding energy:1078.16793575 MeV (per nucleus)
8.23028959 MeV (average binding energy per nucleon)Separation energy:S_N = 9.24(4) MeV (first neutron)
S_P = 3.88(7) MeV (first proton)Half-life:25.4(9) sDecay constant λ:0.027289259077163 s^-1Specific activity α:1.264152016353 × 10⁺²⁰ Bq g^-1
3416627071.2262 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2+)Year of discovery:1977

Radioactive Decay

Half-life T_½ = 25.4(9) s respectively 2.54 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹³¹Pr	100 %	6.53(5) MeV
EE, p	¹³⁰Ce	> 0 %

Parent Nuclides

Direct parent isotope is: ¹³¹Pm.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 71) and isobaric (same nucleon number A = 131) with Neodymium-131. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 71	Isobar A = 131
40	¹¹¹Zr
41	¹¹²Nb
42	¹¹³Mo
43	¹¹⁴Tc
44	¹¹⁵Ru
45	¹¹⁶Rh
46	¹¹⁷Pd
47	¹¹⁸Ag	¹³¹Ag
48	¹¹⁹Cd	¹³¹Cd
49	¹²⁰In	¹³¹In
50	¹²¹Sn	¹³¹Sn
51	¹²²Sb	¹³¹Sb
52	¹²³Te	¹³¹Te
53	¹²⁴I	¹³¹I
54	¹²⁵Xe	¹³¹Xe
55	¹²⁶Cs	¹³¹Cs
56	¹²⁷Ba	¹³¹Ba
57	¹²⁸La	¹³¹La
58	¹²⁹Ce	¹³¹Ce
59	¹³⁰Pr	¹³¹Pr
60	¹³¹Nd	¹³¹Nd
61	¹³²Pm	¹³¹Pm
62	¹³³Sm	¹³¹Sm
63	¹³⁴Eu	¹³¹Eu
64	¹³⁵Gd
65	¹³⁶Tb