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Isotopes of Manganese

List, data and properties of all known isotopes of Manganese as well as radioactive decay products and intermediate products.

 

Manganese isotopes

All atomic nuclei of the chemical element manganese are summarized under manganese isotopes; these all consist of an atomic nucleus with 25 protons and, in the uncharged state, 25 electrons. The difference between each manganese isotope is based on the number of neutrons in the nucleus.

 

Naturally Occurring Manganese Isotopes

The transition element manganese occurs in nature only in the form of its stable isotope Mn-55. All other manganese isotopes are unstable radionuclides; a total of 25 radioisotopes and several nuclear isomers are known.

 

The standard atomic mass of manganese is 54.938044(3) u.

 

Isotope Table: Manganese

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
42Mn254217Manganese-4242.0 u
[41.9862858 u]
{0 MeV}
43Mn254318Manganese-4343.0(2) u
[42.9862858 u]
{0 MeV}
44Mn254419Manganese-4444.00755(54) u
[43.9938358 u]
{7.03278 MeV}
(2-)~45Fe
45Mn254520Manganese-4544.99436(43) u
[44.9806458 u]
{-5.25363 MeV}
(7/2-)~
46Mn254621Manganese-4645.98651(43) u
[45.9727958 u]
{-12.56585 MeV}
(4+)46Fe
46mMn254621Manganese-46m45.98651(43) u
[45.9727958 u]
{-12.56585 MeV}
1-~
47Mn254722Manganese-4746.97577(3) u
[46.9620558 u]
{-22.5701 MeV}
(5/2-)47Fe
48Mn254823Manganese-4847.968549(7) u
[47.9548348 u]
{-29.29642 MeV}
4+48Fe
49Mn254924Manganese-4948.9596126(24) u
[48.9458984 u]
{-37.62062 MeV}
5/2-49Fe
50Mn255025Manganese-5049.9542374(5) u
[49.9405232 u]
{-42.62759 MeV}
0+50Fe
50mMn255025Manganese-50m49.9542374(5) u
[49.9405232 u]
{-42.62759 MeV}
5++2.76(1)
51Mn255126Manganese-5150.9482081(5) u
[50.9344939 u]
{-48.24384 MeV}
5/2-+3.575(4)51Fe
52Mn255227Manganese-5251.9455635(20) u
[51.9318493 u]
{-50.70727 MeV}
6++3.0622(12)52Fe
52mMn255227Manganese-52m51.9455635 u
[51.9318493 u]
{-50.70727 MeV}
2+0.00766(8)
53Mn255328Manganese-5352.9412877(5) u
[52.9275735 u]
{-54.69016 MeV}
7/2-+5.033(5)53Fe
54Mn255429Manganese-5453.9403564(11) u
[53.9266422 u]
{-55.55766 MeV}
3+3.297(3)
55Mn255530Manganese-5554.938044(3) u
[54.9243298 u]
{-57.71164 MeV}
5/2-+3.4669(6)55Fe
55Cr
56Mn255631Manganese-5655.9389029(4) u
[55.9251887 u]
{-56.91158 MeV}
3++3.240(2)56Cr
57Mn255732Manganese-5756.9382860(16) u
[56.9245718 u]
{-57.48622 MeV}
5/2-+3.481(2)57Cr
58Mn255833Manganese-5857.9400666(29) u
[57.9263524 u]
{-55.8276 MeV}
1++2.623(2)58Cr
58mMn255833Manganese-58m57.9400666(29) u
[57.9263524 u]
{-55.8276 MeV}
4++3.062(2)
59Mn255934Manganese-5958.9403911(25) u
[58.9266769 u]
{-55.52533 MeV}
5/2-+3.494(3)59Cr
60Mn256035Manganese-6059.9431366(25) u
[59.9294224 u]
{-52.96792 MeV}
1++2.488(7)60Cr
60mMn256035Manganese-60m59.9431366(25) u
[59.9294224 u]
{-52.96792 MeV}
4++3.400(2)
61Mn256136Manganese-6160.9444525(25) u
[60.9307383 u]
{-51.74216 MeV}
(5/2-)+3.533(2)61Cr
62Mn256237Manganese-6261.947907(7) u
[61.9341928 u]
{-48.52432 MeV}
(1+)+2.384(7)62Cr
62mMn256237Manganese-62m61.947907(7) u
[61.9341928 u]
{-48.52432 MeV}
(4+)+3.170(3)
63Mn256338Manganese-6362.949665(4) u
[62.9359508 u]
{-46.88675 MeV}
5/2-+3.439(3)63Cr
64Mn256439Manganese-6463.953849(4) u
[63.9401348 u]
{-42.98938 MeV}
(1+)+2.085(3)64Cr
64mMn256439Manganese-64m63.953849(4) u
[63.9401348 u]
{-42.98938 MeV}
(4+)
65Mn256540Manganese-6564.956020(4) u
[64.9423058 u]
{-40.96711 MeV}
(5/2-)65Cr
66Mn256641Manganese-6665.960547(12) u
[65.9468328 u]
{-36.75023 MeV}
66Cr
67Mn256742Manganese-6766.96408(32) u
[66.9503658 u]
{-33.45926 MeV}
(5/2-)67Cr
68Mn256843Manganese-6867.96953(43) u
[67.9558158 u]
{-28.38262 MeV}
>3
69Mn256944Manganese-6968.97341(43) u
[68.9596958 u]
{-24.76843 MeV}
(5/2-)
70Mn257045Manganese-7069.97907(54) u
[69.9653558 u]
{-19.49617 MeV}
71Mn257146Manganese-7170.98328(54) u
[70.9695658 u]
{-15.57458 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
Mn-42p → 41Cr
Mn-43p → 42Cr
Mn-44105 nsp → 43Cr
EC/β+44Cr
?
?

AL
Mn-45< 70 nsAL
Mn-4636.2(4) msβ+46Cr
EC, p → 45V
43 %
57.0(8) %
16.90(40) MeV
AL
Mn-46m1 msβ+46Cr17.1 MeV150(100) keVAL
Mn-47100(50) msβ+47Cr
β+, p → 46V
96.6 %
3.4(9) %
12.00(30) MeV
AL
Mn-48158.1(22) msβ+48Cr
β+, p → 47V
β+, α → 44Ti
99.71 %
0.027 %
6 x 10-4%
13.526(10) MeV

AL
Mn-49382(7) msβ+49Cr100 %7.712(3) MeVAL
Mn-50283.19(10) msEC β+50Cr100 %7.6345(6) MeVAL
Mn-50m1.75(3) minEC β+50Cr100 %7.887 MeV225.28(9) keVAL
Mn-5146.2(1) minEC β+51Cr100 %3.2075(6) MeVAL
Mn-525.591(3) dEC β+52Cr100 %4.7120(19) MeVAL
Mn-52m21.1(2) minEC β+52Cr
Iso → 52Mn
98.22(5) %
1.78(5) %
5.09 MeV
0.378 MeV
377.749(5) keVAL
Mn-533.74(4) × 106 aEC → 53Cr100 %0.5969(6) MeVAL
Mn-54312.2(2) dEC β+54Cr
β-54Fe
99.99 %
0.000093 %
1.3771(11) MeV
0.6969(11) MeV
AL
Mn-55stableAL
Mn-562.5789(1) hβ-56Fe100 %3.69554(21) MeVAL
Mn-5785.4(18) sβ-57Fe100 %2.6956(15) MeVAL
Mn-583.0(1) sβ-58Fe100 %6.3276(27) MeVAL
Mn-58m65.4(5) sβ-58Fe
Iso → 58Mn
90 %
10 %

71.77(5) keVAL
Mn-594.59(5) sβ-59Fe5.1395(24) MeVAL
Mn-600.28(2) sβ-60Fe100 %8.445(4) MeVAL
Mn-60m1.77(2) sβ-60Fe
Iso → 60Mn
88.5 %
11.5 %

271.8(1) keVAL
Mn-61709(8) msβ-61Fe100 %7.178(3) MeVAL
Mn-6292(13) msβ-62Fe
β-, n → 61Fe
100 %
?
10.354(7) MeV
2.325(7) MeV
AL
Mn-62m671(5) msβ-62Fe
β-, n → 61Fe
100 %
?

+ YAL
Mn-63275(4) msβ-63Fe
β-, n → 62Fe
100 %
?
8.749(6) MeV
3.920(5) MeV
AL
Mn-6490(4) msβ-64Fe
β-, n → 63Fe
77 %
33 %
11.981(6) MeV
4.575(6) MeV
AL
Mn-64m0.50(5) msIso → 64Mn100 %175(10) keVAL
Mn-6592(1) msβ-65Fe
β-, n → 64Fe
79 %
21.0(5) %
10.251(6) MeV
5.931(6) MeV
AL
Mn-6665(2) msβ-66Fe13.317(12) MeVAL
Mn-6747(2) msβ-67Fe
β-, n → 66Fe
100 %
?
12.15(40) MeV
8.54(30) MeV
AL
Mn-6828(3) msβ-68Fe
β-, n → 67Fe
100 %
?
15.11(54) MeV
9.16(48) MeV
AL
Mn-6916(3) msβ-69Fe100 %14.26(56) MeVAL
Mn-7019.9(17) msβ-70Fe
β-, n → 69Fe

50(20) %
17.01(64) MeV
11.46(64) MeV
AL
Mn-71637 nsβ-71Fe
β-, n → 70Fe
β-, 2n → 69Fe
?
?
?
15.86(64) MeV
12.87(64) MeV
AL

 

Notes (related to the columns):

1 - nuclide, isotope symbol.
2 - Z = number of protons (atomic number).
3 - Mass number A.
4 - N = number of neutrons.
5 - Identification of the Manganese isotope.
6 - Relative atomic mass of the Manganese isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to 12C = 12.00000 [2]. In addition, the mass excess is given in MeV.
7 - Nuclear spin I, unit: h/2π.
8 - Nuclear magnetic moment μmag.
9 - Source nuclides: Possible, assumed or actual source nuclides (mother nuclides, parent nuclides). If applicable, the corresponding decay modes can be found in the data for the respective starting nuclide.
10 - Decay: Half-live of the Manganese isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
11 - Decay: type of decay into the respective daughter nuclides with n = neutron emission; p = proton emission; α = alpha decay; β- = beta minus decay with electron emission; EC = electron capture; β+ = positron emission; ε = β+ and/or EC; Iso = isomeric transition; CD = cluster decay; SF = spontaneous decay.
12 - Decay percentage in percent (%).
13 - Decay energy; Particle energy related to decay type.
14 - AE = Excitation energy for metastable nuclei.
15 - Other information and notes: AL = Adopted Levels (link to external data [1]).

Miscellaneous:

()- Numbers in brackets: uncertainty to represent the spread of the reported value.
~ - Theoretical values or systematic trends.
  - unlisted-: Nuclides that have already been mentioned in the literature but for some reason can no longer be found in the current nuclide tables because their discovery e.g. has not confirmed.

 

NMR active Manganese nuclides

Nuclide
quantity 1)
spin
Nuclear magnetic
moment
μ/μN
Gyromagnetic
ratio
107 rad T-1 s-1
Quadrupole
moment
Q fm-2
Resonant
frequency
v0 bei 1 T
Relative
sensitivity
H0 = const.
v0 = const. 2)
55Mn
100 %
5/2-
+3,4669(6)6,608+ 33,0(10)10,57630,17881
2,8981

1) Quantity Percentage of natural occurrence.

2) Related to 1H = 1,000.

 

Radiation Protection

According to the Radiation Protection Ordinance (StrlSchV 2018, Germany), the following values (columns 1 to 7) apply to the handling of Manganese radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Mn-51105 Bq10 Bq/g1 Bq cm-246.2 min
Mn-52105 Bq1 Bq/g0,02 TBq1 Bq cm-25.6 d
Mn-52m105 Bq10 Bq/gUnbegrenzt (UL)1 Bq cm-221.2 min
Mn-53109 Bq100 Bq/g100 Bq cm-23.7 × 106 a
Mn-54106 Bq0,1 Bq/g0,08 TBq1 Bq cm-2312.1 d
Mn-56105 Bq10 Bq/g0,04 TBq1 Bq cm-22.6 h

(HASS = High-Activity Sealed Radioactive Sources; SC = surface contamination)

 

Literature Sources and References

Properties of the Manganese nucleides

[1] - NuDat: National Nuclear Data Center, Brookhaven National Laboratory, based on ENSDF and the Nuclear Wallet Cards.

[2] - G. Audi et. al.: The NUBASE evaluation of nuclear and decay properties. Nuclear Physics, (2003), DOI 10.1016/j.nuclphysa.2003.11.001.

[3] - Live Chart of Nuclides. Nuclear structure and decay data.

Manganese: NMR properties - 55Mn-NMR

[4] - N. J. Stone: Table of nuclear magnetic dipole and electric quadrupole moments. Atomic Data and Nuclear Data Tables, (2005), DOI 10.1016/j.adt.2005.04.001.

[5] - Pekka Pyykkö: Year-2008 nuclear quadrupole moments. Molecular Physics, (2008), DOI 10.1080/00268970802018367.

[6] - Pekka Pyykkö: Year-2017 nuclear quadrupole moments. Molecular Physics, (2018), DOI 10.1080/00268976.2018.1426131.

[7] - N. J. Stone: Table of recommended nuclear magnetic dipole moments. IAEA, (2019).

More sources:

[8] - Isotopic abundances, atomic weights and isotopic masses: see respective keyword.

[9] - K. Garofali, R. Robinson, M. Thoennessen:
Discovery of chromium, manganese, nickel, and copper isotopes.
In: Atomic Data and Nuclear Data Tables, (2012), DOI 10.1016/j.adt.2011.11.002.

 


Category: Isotopes

Last update: 05.07.2020



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