Holmium-152

Properties and data of the isotope ¹⁵²Ho.

Content

General data

Name of the isotope:Holmium-152; Ho-152Symbol:¹⁵²Ho or 15267HoMass number A:152 (= number of nucleons)Atomic number Z:67 (= number of protons)Neutrons N:85Isotopic mass:151.931717(13) u (atomic weight of Holmium-152)Nuclide mass:151.8949653 u (calculated nuclear mass without electrons)Mass excess:-63.6052 MeVMass defect:1.329078004 u (per nucleus)Nuclear binding energy:1238.02818626 MeV (per nucleus)
8.14492228 MeV (average binding energy per nucleon)Separation energy:S_N = 8.053(15) MeV (first neutron)
S_P = 2.141(13) MeV (first proton)Half-life:161.8(3) sDecay constant λ:0.0042839751579725 s^-1Specific activity α:1.708523300780 × 10⁺¹⁹ Bq g^-1
461763054.26489 Ci g^-1Spin and parity:
(nuclear angular momentum)2-Magnetic dipole moment:μ(μ_N) = - 1.02(2)Quadrupole moment Q:+ 0.08 barn (100 fm²)Nuclear g-factor:g_l = -0.51Charge radius:5.0614(343) femtometer fmYear of discovery:1963

Radioactive Decay

Half-life T_½ = 161.8(3) s respectively 1.618 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁵²Dy	88(3) %	6.513(13) MeV
α	¹⁴⁸Tb	12(3) %	4.5074(13) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁵²Er, ¹⁵⁶Tm.

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
^152mHo	160(1) keV	49.8(2) s	9+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 85) and isobaric (same nucleon number A = 152) with Holmium-152. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 85	Isobar A = 152
47	¹³²Ag
48	¹³³Cd
49	¹³⁴In
50	¹³⁵Sn
51	¹³⁶Sb
52	¹³⁷Te
53	¹³⁸I
54	¹³⁹Xe
55	¹⁴⁰Cs
56	¹⁴¹Ba	¹⁵²Ba
57	¹⁴²La	¹⁵²La
58	¹⁴³Ce	¹⁵²Ce
59	¹⁴⁴Pr	¹⁵²Pr
60	¹⁴⁵Nd	¹⁵²Nd
61	¹⁴⁶Pm	¹⁵²Pm
62	¹⁴⁷Sm	¹⁵²Sm
63	¹⁴⁸Eu	¹⁵²Eu
64	¹⁴⁹Gd	¹⁵²Gd
65	¹⁵⁰Tb	¹⁵²Tb
66	¹⁵¹Dy	¹⁵²Dy
67	¹⁵²Ho	¹⁵²Ho
68	¹⁵³Er	¹⁵²Er
69	¹⁵⁴Tm	¹⁵²Tm
70	¹⁵⁵Yb	¹⁵²Yb
71	¹⁵⁶Lu	¹⁵²Lu
72	¹⁵⁷Hf
73	¹⁵⁸Ta
74	¹⁵⁹W
75	¹⁶⁰Re
76	¹⁶¹Os