075 - isotopes of rhenium - wikipedia, the free encyclopedia

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Naturally occurring rhenium (Re) is 37.4% 185Re, which is stable, and 62.6% 187Re, which is unstable but has a very long half-life(41.2×109 years). Among elements with a known stable isotope, only indium and tellurium similarly occur with a stable isotope in lowerabundance than the long-lived radioactive isotope.

There are 33 other unstable isotopes recognized, the longest-lived of which are 183Re with a half-life of 70 days, 184Re with a half-life of38 days, 186Re with a half-life of 3.7186 days, 182Re with a half-life of 64.0 hours, and 189Re with a half-life of 24.3 hours. There are alsonumerous isomers, the longest-lived of which are 186mRe with a half-life of 200,000 years and 184mRe with a half-life of 169 days. Allothers have half-lives less than a day.

Standard atomic mass: 186.207(1) u

Table

Isotopes of rhenium - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Isotopes_of_rhenium

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nuclidesymbol

Z(p) N(n)

isotopic mass (u) half-life[n 1] decay

mode(s)[1][n 2]daughter

isotope(s)[n 3]nuclear

spin

representativeisotopic

composition(mole fraction)

range of naturalvariation

(mole fraction)excitation energy

160Re 75 85 159.98212(43)# 860(120) µs[0.82(+15-9) ms]

p (91%) 159W(2-)

α (9%) 156Ta161Re 75 86 160.97759(22) 0.37(4) ms p 160W 1/2+

161mRe 123.8(13) keV 15.6(9) ms α 157Ta 11/2-

162Re 75 87 161.97600(22)# 107(13) msα (94%) 158Ta

(2-)β+ (6%) 162W

162mRe 173(10) keV 77(9) msα (91%) 158Ta

(9+)β+ (9%) 162W

163Re 75 88 162.972081(21) 390(70) msβ+ (68%) 163W

(1/2+)α (32%) 159Ta

163mRe 115(4) keV 214(5) msα (66%) 159Ta

(11/2-)β+ (34%) 163W

164Re 75 89 163.97032(17)# 0.53(23) sα (58%) 160Ta

highβ+ (42%) 164W

164mRe 120(120)# keV 530(230) ms (2#)-

165Re 75 90 164.967089(30) 1# sβ+ 165W

1/2+#α 161Ta

165mRe 47(26) keV 2.1(3) sβ+ (87%) 165W

11/2-#α (13%) 161Ta

166Re 75 91 165.96581(9)# 2# sβ+ 166W

2-#α 162Ta

167Re 75 92 166.96260(6)# 3.4(4) sα 163Ta

9/2-#β+ 167W

167mRe 130(40)# keV 5.9(3) sβ+ (99.3%) 167W

1/2+#α (.7%) 163Ta

168Re 75 93 167.96157(3) 4.4(1) sβ+ (99.99%) 168W

(5+,6+,7+)α (.005%) 164Ta

168mRe non-exist 6.6(15) s

169Re 75 94 168.95879(3) 8.1(5) sβ+ (99.99%) 169W

9/2-#α (.005%) 165Ta

169mRe 145(29) keV 15.1(15) sβ+ (99.8%) 169W

1/2+#α (.2%) 164Ta

170Re 75 95 169.958220(28) 9.2(2) sβ+ (99.99%) 170W

(5+)α (.01%) 166Ta

171Re 75 96 170.95572(3) 15.2(4) s β+ 171W (9/2-)172Re 75 97 171.95542(6) 15(3) s β+ 172W (5)

172mRe 0(100)# keV 55(5) s β+ 172W (2)173Re 75 98 172.95324(3) 1.98(26) min β+ 173W (5/2-)174Re 75 99 173.95312(3) 2.40(4) min β+ 174W


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175Re 75 100 174.95138(3) 5.89(5) min β+ 175W (5/2-)176Re 75 101 175.95162(3) 5.3(3) min β+ 176W 3+177Re 75 102 176.95033(3) 14(1) min β+ 177W 5/2-

177mRe 84.71(10) keV 50(10) µs 5/2+178Re 75 103 177.95099(3) 13.2(2) min β+ 178W (3+)179Re 75 104 178.949988(26) 19.5(1) min β+ 179W (5/2)+

179m1Re 65.39(9) keV 95(25) µs (5/2-)179m2Re 1684.59(14)+Y keV >0.4 µs (23/2+)

180Re 75 105 179.950789(23) 2.44(6) min β+ 180W (1)-181Re 75 106 180.950068(14) 19.9(7) h β+ 181W 5/2+182Re 75 107 181.95121(11) 64.0(5) h β+ 182W 7+

182m1Re 60(100) keV 12.7(2) h β+ 182W 2+182m2Re 235.736(10)+X keV 585(21) ns 2-182m3Re 461.3(1)+X keV 0.78(9) µs (4-)

183Re 75 108 182.950820(9) 70.0(14) d EC 183W 5/2+183mRe 1907.6(3) keV 1.04(4) ms IT 183Re (25/2+)

184Re 75 109 183.952521(5) 38.0(5) d β+ 184W 3(-)

184mRe 188.01(4) keV 169(8) dIT (75.4%) 184Re

8(+)β+ (24.6%) 184W

185Re 75 110 184.9529550(13) Observationally Stable[n 4] 5/2+ 0.3740(2)185mRe 2124(2) keV 123(23) ns (21/2)

186Re 75 111 185.9549861(13) 3.7186(5) dβ- (93.1%) 186Os

1-EC (6.9%) 186W

186mRe 149(7) keV 2.0(5)×105 aIT (90%) 186Re

(8+)β- (10%) 186Os

187Re[n 5][n 6] 75 112 186.9557531(15) 41.2(2)×109 a[n 7] β- (99.99%) 187Os

5/2+ 0.6260(2)α (10−4%) 183Ta

188Re 75 113 187.9581144(15) 17.0040(22) h β- 188Os 1-188mRe 172.069(9) keV 18.59(4) min IT 188Re (6)-

189Re 75 114 188.959229(9) 24.3(4) h β- 189Os 5/2+190Re 75 115 189.96182(16) 3.1(3) min β- 190Os (2)-

190mRe 210(50) keV 3.2(2) hβ- (54.4%) 190Os

(6-)IT (45.6%) 190Re

191Re 75 116 190.963125(11) 9.8(5) min β- 191Os (3/2+,1/2+)192Re 75 117 191.96596(21)# 16(1) s β- 192Os193Re 75 118 192.96747(21)# 30# s [>300 ns] 5/2+#194Re 75 119 193.97042(32)# 2# s [>300 ns]

^ Bold for isotopes with half-lives longer than the age of the universe (nearly stable)1.^ Abbreviations:EC: Electron captureIT: Isomeric transition

2.

^ Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe)3.^ Believed to undergo α decay to 181Ta4.^ primordial radionuclide5.


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^ Used in rhenium-osmium dating6.^ Can undergo Bound-state β- decay with a half-life of 33 years when fully ionized7.

Notes

Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weakassignment arguments are enclosed in parentheses.Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standarddeviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References

^ http://www.nucleonica.net/unc.aspx1.

Isotope masses from:G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decayproperties" (http://www.nndc.bnl.gov/amdc/nubase/Nubase2003.pdf). Nuclear Physics A 729: 3–128.Bibcode:2003NuPhA.729....3A (http://adsabs.harvard.edu/abs/2003NuPhA.729....3A). doi:10.1016/j.nuclphysa.2003.11.001(http://dx.doi.org/10.1016%2Fj.nuclphysa.2003.11.001).

Isotopic compositions and standard atomic masses from:J. R. de Laeter, J. K. Böhlke, P. De Bièvre, H. Hidaka, H. S. Peiser, K. J. R. Rosman and P. D. P. Taylor (2003). "Atomicweights of the elements. Review 2000 (IUPAC Technical Report)" (http://www.iupac.org/publications/pac/75/6/0683/pdf/).Pure and Applied Chemistry 75 (6): 683–800. doi:10.1351/pac200375060683 (http://dx.doi.org/10.1351%2Fpac200375060683).M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)" (http://iupac.org/publications/pac/78/11/2051/pdf/). Pure and Applied Chemistry 78 (11): 2051–2066. doi:10.1351/pac200678112051 (http://dx.doi.org/10.1351%2Fpac200678112051). Lay summary (http://old.iupac.org/news/archives/2005/atomic-weights_revised05.html).

Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decayproperties" (http://www.nndc.bnl.gov/amdc/nubase/Nubase2003.pdf). Nuclear Physics A 729: 3–128.Bibcode:2003NuPhA.729....3A (http://adsabs.harvard.edu/abs/2003NuPhA.729....3A). doi:10.1016/j.nuclphysa.2003.11.001(http://dx.doi.org/10.1016%2Fj.nuclphysa.2003.11.001).National Nuclear Data Center. "NuDat 2.1 database" (http://www.nndc.bnl.gov/nudat2/). Brookhaven National Laboratory.Retrieved September 2005.N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide. CRC Handbook of Chemistry and Physics (85th ed.). CRC Press.Section 11. ISBN 978-0-8493-0485-9.

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