Ruthenium-115

Properties and data of the isotope ¹¹⁵Ru.

Content

General data

Name of the isotope:Ruthenium-115; Ru-115Symbol:¹¹⁵Ru or 11544RuMass number A:115 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:71Isotopic mass:114.92894(10) u (atomic weight of Ruthenium-115)Nuclide mass:114.9048037 u (calculated nuclear mass without electrons)Mass excess:-66.19196 MeVMass defect:1.030570444 u (per nucleus)Nuclear binding energy:959.97018516 MeV (per nucleus)
8.34756683 MeV (average binding energy per nucleon)Separation energy:S_N = 4.04(9) MeV (first neutron)
S_P = 14.88(44) MeV (first proton)Half-life:318(19) msDecay constant λ:2.1797081149684 s^-1Specific activity α:1.15144818437 × 10⁺²² Bq g^-1
311202211993.51 Ci g^-1Spin and parity:
(nuclear angular momentum)(3/2+)Year of discovery:1992

Radioactive Decay

Half-life T_½ = 318(19) ms respectively 3.18 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹¹⁵Rh	100 %	8.04(9) MeV
β^-, n	¹¹⁴Rh	?	1.45(11) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 71) and isobaric (same nucleon number A = 115) with Ruthenium-115. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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