Tantalum isotopes

Tantalum isotopes are varieties of the chemical element of tantalum having a different number of neutrons in the nucleus . Tantalum isotopes with mass numbers from 155 to 190 (the number of protons 73, neutrons from 82 to 117), and more than 30 nuclear isomers are known .

Natural tantalum consists of a mixture of a stable isotope and a stable isomer:

^180m Ta ( isotopic abundance 0.012%)
¹⁸¹ Ta (isotopic abundance 99.988%)

^180m Ta

^180m Ta is the only stable (within the sensitivity of modern methods) isomer. Unlike radio- or cosmogenic short-lived radionuclides , it exists in the earth's crust from the moment of its formation, occurring in natural tantalum in a ratio of 1 to 8300. Although ^180m Ta can theoretically decay in at least three ways ( isomeric transition , beta-minus decay , electronic capture ), none of them were experimentally detected; the lower limit for its half-life is 1.2⋅10 ¹⁵ years ^[1] . At the same time, the ground state of ¹⁸⁰ Ta is beta-active with a half-life of 8.152 (6) hours ^[1] . The spin and parity of the ground state are 1 ⁺ , the isomer - 9 ^- ^[1] . Due to the high difference between the spins of states and the proximity of their energies (the isomeric level lies 75.3 (13) keV ^[1] above the ground state), the isomeric transition is extremely strongly suppressed. It is expected that ^180m Ta, like any other nuclear isomer, can be artificially brought into the ground state by stimulated emission when irradiated with gamma rays with an energy exactly equal to the difference between the energies of the excited and ground states.

Tantalum Isotope Table

Symbol nuclide	Z ( p )	N ( n )	Isotope mass ^[2] ( a.m. )	Period half-life ^[1] (T _1/2 )	Spin and Parity kernels ^[1]
Symbol nuclide	Excitation energy			Period half-life ^[1] (T _1/2 )	Spin and Parity kernels ^[1]
¹⁵⁵ Ta	73	82	154.97459	13 μs	11 / 2-
¹⁵⁶ Ta	73	83	155,97230	144 ms	2-
^156m Ta	102 keV			360 ms	9+
¹⁵⁷ Ta	73	84	156,96819	10.1 ms	1/2 +
^157m1 Ta	22 keV			4.3 ms	11 / 2-
^157m2 Ta	1,593 MeV			1.7 ms	25 / 2-
¹⁵⁸ Ta	73	85	157,96670	49 ms	2-
^158m Ta	141 keV			36.0 ms	9+
¹⁵⁹ Ta	73	86	158,963018	1.04 s	1/2 +
^159m Ta	64 keV			514 ms	11 / 2-
¹⁶⁰ Ta	73	87	159.96149	1.70 s	2-
^160m Ta	310 keV			1.55 s	9+
¹⁶¹ Ta	73	88	160,95842	3 s	1/2 +
^161m Ta	50 keV			2.89 s	11 / 2-
¹⁶² Ta	73	89	161.95729	3.57 s	3+
¹⁶³ Ta	73	90	162.95433	10.6 s	1/2 +
¹⁶⁴ Ta	73	91	163.95353	14.2 s	3+
¹⁶⁵ Ta	73	92	164,950773	31.0 s	5 / 2-
^165m Ta	60 keV				9 / 2-
¹⁶⁶ Ta	73	93	165,95051	34.4 s	2+
¹⁶⁷ Ta	73	94	166.94809	1.33 min	3/2 +
¹⁶⁸ Ta	73	95	167.94805	2.0 min	2-
¹⁶⁹ Ta	73	96	168,94601	4.9 min	5/2 +
¹⁷⁰ Ta	73	97	169,94618	6.76 min	3+
¹⁷¹ Ta	73	98	170,94448	23.3 min	5 / 2-
¹⁷² Ta	73	99	171.94490	36.8 min	3+
¹⁷³ Ta	73	100	172.94375	3.14 h	5 / 2-
¹⁷⁴ Ta	73	101	173.94445	1.14 h	3+
¹⁷⁵ Ta	73	102	174.94374	10.5 h	7/2 +
¹⁷⁶ Ta	73	103	175.94486	8.09 h	one-
^176m1 Ta	103.0 keV			1.1 ms	+
^176m2 Ta	1.3726 MeV			3.8 μs	14-
^176m3 Ta	2.820 MeV			970 μs	20-
¹⁷⁷ Ta	73	104	176,944472	56.56 h	7/2 +
^177m1 Ta	73.36 keV			410 ns	9 / 2-
^177m2 Ta	186.15 keV			3.62 μs	5 / 2-
^177m3 Ta	1.355501 MeV			5.31 μs	21 / 2-
^177m4 Ta	4.6563 MeV			133 μs	49 / 2-
¹⁷⁸ Ta	73	105	177,945778	9.31 min	1+
^178m1 Ta	100 keV			2.36 h	7-
^178m2 Ta	1,570 MeV			59 ms	15-
^178m3 Ta	3.00 MeV			290 ms	21-
¹⁷⁹ Ta	73	106	178,9459295	1.82 years	7/2 +
^179m1 Ta	30.7 keV			1.42 μs	9 / 2-
^179m2 Ta	520.23 keV			335 ns	1/2 +
^179m3 Ta	1.25261 MeV			322 ns	21 / 2-
^179m4 Ta	1.3173 MeV			9.0 ms	25/2 +
^179m5 Ta	1.3279 MeV			1.6 μs	23 / 2-
^179m6 Ta	2.6393 MeV			54.1 ms	37/2 +
¹⁸⁰ Ta	73	107	179.9474648	8.152 h	1+
^180m1 Ta	77.1 keV			stable (> 7.1⋅10 ¹⁵ years) ^[3]	9-
^180m2 Ta	1.45240 MeV			31.2 μs	15-
^180m3 Ta	3.6790 MeV			2.0 μs	22-
^180m4 Ta	4.1710 MeV			17 μs	24
¹⁸¹ Ta	73	108	180,9479958	stable	7/2 +
^181m1 Ta	6.238 keV			6.05 μs	9 / 2-
^181m2 Ta	615.21 keV			18 μs	1/2 +
^181m3 Ta	1.485 MeV			25 μs	21 / 2-
^181m4 Ta	2.230 MeV			210 μs	29 / 2-
¹⁸² Ta	73	109	181.9501518	114.43 days	3-
^182m1 Ta	16,263 keV			283 ms	5+
^182m2 Ta	519.572 keV			15.84 min	ten-
¹⁸³ Ta	73	110	182.9513726	5.1 days	7/2 +
^183m Ta	73.174 keV			107 ns	9 / 2-
¹⁸⁴ Ta	73	111	183.954008	8.7 h	five-
¹⁸⁵ Ta	73	112	184,955559	49.4 min	7/2 +
^185m Ta	1,308 MeV			1 ms	21 / 2-
¹⁸⁶ Ta	73	113	185,95855	10.5 min	2-
^186m Ta				1.54 min
¹⁸⁷ Ta	73	114	186,96053	2 minutes	7/2 +
¹⁸⁸ Ta	73	115	187,96370	20 s
¹⁸⁹ Ta	73	116	188,96583	3 s	7/2 +
¹⁹⁰ Ta	73	117	189,96923	300 ms
¹⁹¹ Ta	73	118		> 300 ns
¹⁹² Ta	73	119		2.2 s

Notes

↑ ¹ ² ³ ⁴ ⁵ ⁶ Data are given for Audi G. , Bersillon O. , Blachot J. , Wapstra AH The NUBASE evaluation of nuclear and decay properties // Nuclear Physics A. - 2003 .-- T. 729 . - S. 3—128 . - DOI : 10.1016 / j.nuclphysa.2003.11.001 . - .
↑ Data shown for Audi G. , Wapstra AH , Thibault C. The AME2003 atomic mass evaluation (II). Tables, graphs, and references (Eng.) // Nuclear Physics A. - 2003. - Vol. 729 . - P. 337–676 . - DOI : 10.1016 / j.nuclphysa.2003.11.003 . - .
↑ M. Hult et al. Underground search for the decay of ¹⁸⁰ Ta ^m // Phys. Rev. C. - 2006 .-- T. 74 . - S. 054311 . - DOI : 10.1103 / PhysRevC.74.054311 .

Hafnium Isotopes Periodic Table on the Isotopes of Elements Tungsten Isotopes

one
H

2
He

3
Li

four
Be

five
B

6
C

7
N

eight
O

9
F

ten
Ne

eleven
Na

12
Mg

13
Al

14
Si

15
P

sixteen
S

17
Cl

18
Ar

nineteen
K

20
Ca

21
Sc

22
Ti

23
V

24
Cr

25
Mn

26
Fe

27
Co

28
Ni

29th
Cu

thirty
Zn

31
Ga

32
Ge

33
As

34
Se

35
Br

36
Kr

37
Rb

38
Sr

39
Y

40
Zr

41
Nb

42
Mo

43
Tc

44
Ru

45
Rh

46
Pd

47
Ag

48
Cd

49
In

50
Sn

51
Sb

52
Te

53
I

54
Xe

55
Cs

56
Ba

*

72
Hf

73
Ta

74
W

75
Re

76
Os

77
Ir

78
Pt

79
Au

80
Hg

81
Tl

82
Pb

83
Bi

84
Po

85
At

86
Rn

87
Fr

88
Ra

**

104
Rf

105
Db

106
Sg

107
Bh

108
Hs

109
Mt

110
Ds

111
Rg

112
Cn

113
Nh

114
Fl

115
Mc

116
Lv

117
Ts

118
Og

*

57
La

58
Ce

59
Pr

60
Nd

61
Pm

62
Sm

63
Eu

64
Gd

65
Tb

66
Dy

67
Ho

68
Er

69
Tm

70
Yb

71
Lu

**

89
Ac

90
Th

91
Pa

92
U

93
Np

94
Pu

95
Am

96
Cm

97
Bk

98
Cf

99
Es

100
Fm

101
Md

102
No

103
Lr

[Nubase2003-1] ¹ ² ³ ⁴ ⁵ ⁶ Data are given for Audi G. , Bersillon O. , Blachot J. , Wapstra AH The NUBASE evaluation of nuclear and decay properties // Nuclear Physics A. - 2003 .-- T. 729 . - S. 3—128 . - DOI : 10.1016 / j.nuclphysa.2003.11.001 . - .

[AME2003-2] Data shown for Audi G. , Wapstra AH , Thibault C. The AME2003 atomic mass evaluation (II). Tables, graphs, and references (Eng.) // Nuclear Physics A. - 2003. - Vol. 729 . - P. 337–676 . - DOI : 10.1016 / j.nuclphysa.2003.11.003 . - .

[3] M. Hult et al. Underground search for the decay of ¹⁸⁰ Ta ^m // Phys. Rev. C. - 2006 .-- T. 74 . - S. 054311 . - DOI : 10.1103 / PhysRevC.74.054311 .

Tantalum isotopes

180m Ta

Tantalum Isotope Table

Notes

More articles:

^180m Ta