Erbium-144

Properties and data of the isotope ¹⁴⁴Er.

Content

General data

Name of the isotope:Erbium-144; Er-144Symbol:¹⁴⁴Er or 14468ErMass number A:144 (= number of nucleons)Atomic number Z:68 (= number of protons)Neutrons N:76Isotopic mass:143.96070(21) u (atomic weight of Erbium-144)Nuclide mass:143.9233999 u (calculated nuclear mass without electrons)Mass excess:-36.60771 MeVMass defect:1.229935792 u (per nucleus)Nuclear binding energy:1145.67781063 MeV (per nucleus)
7.95609591 MeV (average binding energy per nucleon)Separation energy:S_N = 13.42(44) MeV (first neutron)
S_P = 1.85(36) MeV (first proton)Half-life:200 nsDecay constant λ:3465735.9027997 s^-1Specific activity α:1.459520964335 × 10⁺²⁸ Bq g^-1
3.944651254961 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2003

Radioactive Decay

Half-life T_½ = 200 ns respectively 2 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁴⁴Ho	100 %	7.88 MeV

Parent Nuclides

Direct parent isotope is: ¹⁴⁵Tm.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 76) and isobaric (same nucleon number A = 144) with Erbium-144. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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