Arsenic-75m

Properties and data of the isotope ⁷⁵As.

Content

General data

Name of the isotope:Arsenic-75m; As-75mSymbol:⁷⁵As or 7533AsMass number A:75 (= number of nucleons)Atomic number Z:33 (= number of protons)Neutrons N:42Isotopic mass:74.921595(6) u (atomic weight of Arsenic-75m)
Excitation energy: 303.9243(8) keVNuclide mass:74.9034925 u (calculated nuclear mass without electrons)Mass excess:-73.03379 MeVMass defect:0.700557528 u (per nucleus)Nuclear binding energy:652.56513399 MeV (per nucleus)
8.70086845 MeV (average binding energy per nucleon)Half-life:17.62(23) msDecay constant λ:39.338659509645 s^-1Specific activity α:3.201391200110 × 10⁺²³ Bq g^-1
8652408648947 Ci g^-1Spin and parity:
(nuclear angular momentum)9/2+

Radioactive Decay

Half-life T_½ = 17.62(23) ms respectively 1.762 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	⁷⁵As	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
⁷⁵As		stable	3/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 42) and isobaric (same nucleon number A = 75) with Arsenic-75m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 42	Isobar A = 75
23	⁶⁵V
24	⁶⁶Cr
25	⁶⁷Mn
26	⁶⁸Fe
27	⁶⁹Co	⁷⁵Co
28	⁷⁰Ni	⁷⁵Ni
29	⁷¹Cu	⁷⁵Cu
30	⁷²Zn	⁷⁵Zn
31	⁷³Ga	⁷⁵Ga
32	⁷⁴Ge	⁷⁵Ge
33	⁷⁵As	⁷⁵As
34	⁷⁶Se	⁷⁵Se
35	⁷⁷Br	⁷⁵Br
36	⁷⁸Kr	⁷⁵Kr
37	⁷⁹Rb	⁷⁵Rb
38	⁸⁰Sr	⁷⁵Sr
39	⁸¹Y
40	⁸²Zr
41	⁸³Nb
42	⁸⁴Mo
43	⁸⁵Tc
44	⁸⁶Ru