Isotopes of titanium

Isotopes of titanium (₂₂Ti)
Standard atomic weight Ar°(Ti)
	47.867±0.001; 47.867±0.001 (abridged);
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Naturally occurring titanium (₂₂Ti) is composed of five stable isotopes; ⁴⁶Ti, ⁴⁷Ti, ⁴⁸Ti, ⁴⁹Ti and ⁵⁰Ti with ⁴⁸Ti being the most abundant (73.8% natural abundance). Twenty-one radioisotopes have been characterized, with the most stable being ⁴⁴Ti with a half-life of 59.1 years, ⁴⁵Ti with a half-life of 184.8 minutes, ⁵¹Ti with a half-life of 5.76 minutes, and ⁵²Ti with a half-life of 1.7 minutes. All of the remaining radioactive isotopes have half-lives that are less than 33 seconds, and the majority of these have half-lives that are less than half a second.

The isotopes of titanium range from ³⁹Ti to ⁶⁴Ti. The primary decay mode for isotopes lighter than the stable isotopes is β⁺ and the primary mode for the heavier ones is β⁻; the decay products are respectively scandium isotopes and vanadium isotopes.

There are two odd stable isotopes of titanium (⁴⁷Ti and ⁴⁹Ti), which thus have non-zero nuclear spin of 5/2− and 7/2− (respectively) and are NMR-active.^[4]

List of isotopes

Nuclide ^{[n 1]}	Z	N	Isotopic mass (Da)^[5] ^{[n 2]}^{[n 3]}	Half-life^[1] ^{[n 4]}	Decay mode^[1] ^{[n 5]}	Daughter isotope ^{[n 6]}	Spin and parity^[1] ^{[n 7]}^{[n 4]}	Natural abundance (mole fraction)
Nuclide ^{[n 1]}	Excitation energy			Half-life^[1] ^{[n 4]}	Decay mode^[1] ^{[n 5]}	Daughter isotope ^{[n 6]}	Spin and parity^[1] ^{[n 7]}^{[n 4]}	Normal proportion^[1]	Range of variation
³⁹Ti	22	17	39.00268(22)#	28.5(9) ms	β⁺, p (93.7%)	³⁸Ca	3/2+#
					β⁺ (~6.3%)	³⁹Sc
					β⁺, 2p (?%)	³⁷K
⁴⁰Ti	22	18	39.990345(73)	52.4(3) ms	β⁺, p (95.8%)	³⁹Ca	0+
⁴⁰Ti	22	18	39.990345(73)	52.4(3) ms	β⁺ (4.2%)	⁴⁰Sc	0+
⁴¹Ti	22	19	40.983148(30)	81.9(5) ms	β⁺, p (91.1%)	⁴⁰Ca	3/2+
⁴¹Ti	22	19	40.983148(30)	81.9(5) ms	β⁺ (8.9%)	⁴¹Sc	3/2+
⁴²Ti	22	20	41.97304937(29)	208.3(4) ms	β⁺	⁴²Sc	0+
⁴³Ti	22	21	42.9685284(61)	509(5) ms	β⁺	⁴³Sc	7/2−
^43m1Ti	313.0(10) keV			11.9(3) μs	IT	⁴³Ti	(3/2+)
^43m2Ti	3066.4(10) keV			556(6) ns	IT	⁴³Ti	(19/2−)
⁴⁴Ti	22	22	43.95968994(75)	59.1(3) y	EC	⁴⁴Sc	0+
⁴⁵Ti	22	23	44.95812076(90)	184.8(5) min	β⁺	⁴⁵Sc	7/2−
^45mTi	36.53(15) keV			3.0(2) μs	IT	⁴⁵Ti	3/2−
⁴⁶Ti	22	24	45.952626356(97)	Stable			0+	0.0825(3)
⁴⁷Ti	22	25	46.951757491(85)	Stable			5/2−	0.0744(2)
⁴⁸Ti	22	26	47.947940677(79)	Stable			0+	0.7372(3)
⁴⁹Ti	22	27	48.947864391(84)	Stable			7/2−	0.0541(2)
⁵⁰Ti	22	28	49.944785622(88)	Stable			0+	0.0518(2)
⁵¹Ti	22	29	50.94660947(52)	5.76(1) min	β⁻	⁵¹V	3/2−
⁵²Ti	22	30	51.9468835(29)	1.7(1) min	β⁻	⁵²V	0+
⁵³Ti	22	31	52.9496707(31)	32.7(9) s	β⁻	⁵³V	(3/2)−
⁵⁴Ti	22	32	53.950892(17)	2.1(10) s	β⁻	⁵⁴V	0+
⁵⁵Ti	22	33	54.955091(31)	1.3(1) s	β⁻	⁵⁵V	(1/2)−
⁵⁶Ti	22	34	55.95768(11)	200(5) ms	β⁻	⁵⁶V	0+
⁵⁷Ti	22	35	56.96307(22)	95(8) ms	β⁻	⁵⁷V	5/2−#
⁵⁸Ti	22	36	57.96681(20)	55(6) ms	β⁻	⁵⁸V	0+
⁵⁹Ti	22	37	58.97222(32)#	28.5(19) ms	β⁻	⁵⁹V	5/2−#
^59mTi	108.5(5) keV			615(11) ns	IT	⁵⁹Ti	1/2−#
⁶⁰Ti	22	38	59.97628(26)	22.2(16) ms	β⁻	⁶⁰V	0+
⁶¹Ti	22	39	60.98243(32)#	15(4) ms	β⁻	⁶¹V	1/2−#
^61m1Ti	125.0(5) keV			200(28) ns	IT	⁶¹Ti	5/2−#
^61m2Ti	700.1(7) keV			354(69) ns	IT	⁶¹Ti	9/2+#
⁶²Ti	22	40	61.98690(43)#	9# ms [>620 ns]			0+
⁶³Ti	22	41	62.99371(54)#	10# ms [>620 ns]			1/2−#
⁶⁴Ti	22	42	63.99841(64)#	5# ms [>620 ns]			0+
This table header & footer: view

^ ^mTi – Excited nuclear isomer.
^ ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
^ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
^ ^a ^b # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
^ Modes of decay:

EC: Electron capture

n: Neutron emission

p: Proton emission
^ Bold symbol as daughter – Daughter product is stable.
^ ( ) spin value – Indicates spin with weak assignment arguments.

Titanium-44

Titanium-44 (⁴⁴Ti) is a radioactive isotope of titanium that undergoes electron capture with a half-life of 59.1 years to an excited state of scandium-44, before reaching the ground state of ⁴⁴Sc and ultimately of ⁴⁴Ca.^[6] Because titanium-44 can decay only through electron capture, its half-life increases slowly with its ionization state and it becomes stable in its fully ionized state (that is, having a charge of +22),^[7] though as astrophysical environments never lack electrons completely will always decay.

Titanium-44 is produced in relative abundance in the alpha process in stellar nucleosynthesis and the early stages of supernova explosions.^[8] It is produced when stable calcium-40 adds an alpha particle (helium-4), as nickel-56 is the result of adding three more. The age of supernova remnants (even though nickel-56 has died away to iron) may be determined through measurements of gamma-ray emissions from the relatively long-lived titanium-44 and of its abundance.^[7] It was observed in the Cassiopeia A supernova remnant and SN 1987A at a relatively high concentration, enhanced by the delayed decay in the ionizing conditions.^[6]

References

^ ^a ^b ^c ^d ^e Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3) 030001. doi:10.1088/1674-1137/abddae.
^ "Standard Atomic Weights: Titanium". CIAAW. 1993.
^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
^ Lucier, Bryan E.G.; Huang, Yining (2016). Reviewing 47/49Ti Solid-State NMR Spectroscopy. Annual Reports on NMR Spectroscopy. Vol. 88. pp. 1–78. doi:10.1016/bs.arnmr.2015.10.001. ISBN 978-0-12-804713-2.
^ Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3) 030003. doi:10.1088/1674-1137/abddaf.
^ ^a ^b Motizuki, Y.; Kumagai, S. (2004). "Radioactivity of the key isotope ⁴⁴Ti in SN 1987A". AIP Conference Proceedings. 704 (1): 369–374. arXiv:astro-ph/0312620. Bibcode:2004AIPC..704..369M. doi:10.1063/1.1737130.
^ ^a ^b Mochizuki, Y.; Takahashi, K.; Janka, H.-Th.; Hillebrandt, W.; Diehl, R. (2008). "Titanium-44: Its effective decay rate in young supernova remnants, and its abundance in Cas A". Astronomy and Astrophysics. 346 (3): 831–842. arXiv:astro-ph/9904378.
^ Fryer, C.; Dimonte, G.; Ellinger, E.; Hungerford, A.; Kares, B.; Magkotsios, G.; Rockefeller, G.; Timmes, F.; Woodward, P.; Young, P. (2011). Nucleosynthesis in the Universe, Understanding ⁴⁴Ti (PDF). ADTSC Science Highlights (Report). Los Alamos National Laboratory. pp. 42–43.

[5] Ti – Excited nuclear isomer.

[7] ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.

[TMS-8] # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).

[TNN-9] # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

[10] Modes of decay:

EC: Electron capture

n: Neutron emission

p: Proton emission

[11] Bold symbol as daughter – Daughter product is stable.

[12] ( ) spin value – Indicates spin with weak assignment arguments.

[NUBASE2020-1] Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3) 030001. doi:10.1088/1674-1137/abddae.

[CIAAWtitanium-2] "Standard Atomic Weights: Titanium". CIAAW. 1993.

[CIAAW2021-3] Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.

[4] Lucier, Bryan E.G.; Huang, Yining (2016). Reviewing 47/49Ti Solid-State NMR Spectroscopy. Annual Reports on NMR Spectroscopy. Vol. 88. pp. 1–78. doi:10.1016/bs.arnmr.2015.10.001. ISBN 978-0-12-804713-2.

[AME2020_II-6] Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3) 030003. doi:10.1088/1674-1137/abddaf.

[sn1987-13] Motizuki, Y.; Kumagai, S. (2004). "Radioactivity of the key isotope ⁴⁴Ti in SN 1987A". AIP Conference Proceedings. 704 (1): 369–374. arXiv:astro-ph/0312620. Bibcode:2004AIPC..704..369M. doi:10.1063/1.1737130.

[ti44-14] Mochizuki, Y.; Takahashi, K.; Janka, H.-Th.; Hillebrandt, W.; Diehl, R. (2008). "Titanium-44: Its effective decay rate in young supernova remnants, and its abundance in Cas A". Astronomy and Astrophysics. 346 (3): 831–842. arXiv:astro-ph/9904378.

[laur-15] Fryer, C.; Dimonte, G.; Ellinger, E.; Hungerford, A.; Kares, B.; Magkotsios, G.; Rockefeller, G.; Timmes, F.; Woodward, P.; Young, P. (2011). Nucleosynthesis in the Universe, Understanding ⁴⁴Ti (PDF). ADTSC Science Highlights (Report). Los Alamos National Laboratory. pp. 42–43.

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Isotopes of titanium

Isotopes of titanium

Isotopes of titanium

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Isotopes of titanium

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Titanium-44

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