| 释义 |
- Actinides vs fission products
- List of isotopes Notes
- See also
- References
{{infobox berkelium isotopes}}Berkelium (97Bk) is an artificial element, and thus a standard atomic weight cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 243Bk in 1949. There are 21 known radioisotopes, from 233Bk to 254Bk (with the exception of 235Bk), and 6 nuclear isomers. The longest-lived isotope is 247Bk with a half-life of 1,380 years. Actinides vs fission products{{Actinides vs fission products}}{{clear}} List of isotopes nuclide
symbol | Z(p) | N(n) |
isotopic mass (u)
| half-life | decay
mode(s)[1][2] | daughter
isotope(s) | nuclear
spin and
parity | | excitation energy |
|---|
| 233Bk[3] | 97 | 136 | 21 s | α | 229Am | | 234Bk[4] | 97 | 137 | | 19(+6-4) s | α (50%) | 230Am | | | β+ (50%) | 234Cm | | 236Bk | 97 | 139 | 236.05733(43)# | 22(+13-6) s[5] | α | 232Am | | | β+ | 236Cm | | 237Bk | 97 | 140 | 237.05700(24)# | 1# min | α | 233Am | 7/2+# | | β+ (rare) | 237Cm | | 238Bk | 97 | 141 | 238.05828(31)# | 2.40(8) min | α | 234Am | | | β+, SF (.048%) | (various) | | β+ (rare) | 238Cm | | 239Bk | 97 | 142 | 239.05828(25)# | 3# min | α | 235Am | 7/2+# | | β+ | 239Cm | | 240Bk | 97 | 143 | 240.05976(16)# | 4.8(8) min | β+ (90%) | 240Cm | | | α (10%) | 236Am | | β+, SF (.002%) | (various) | | 241Bk | 97 | 144 | 241.06023(22)# | 4.6(4) min | α | 237Am | (7/2+) | | β+ (rare) | 241Cm | | 242Bk | 97 | 145 | 242.06198(22)# | 7.0(13) min | β+ (99.99%) | 242Cm | 2−# | | β+, SF (3×10−4%) | (various) | | 242mBk | 200(200)# keV | 600(100) ns | | 243Bk | 97 | 146 | 243.063008(5) | 4.5(2) h | β+ (99.85%) | 243Cm | (3/2−) | | α (.15%) | 239Am | | 244Bk | 97 | 147 | 244.065181(16) | 4.35(15) h | β+ (99.99%) | 244Cm | (4−)# | | α (.006%) | 240Am | | 245Bk | 97 | 148 | 245.0663616(25) | 4.94(3) d | EC (99.88%) | 245Cm | 3/2− | | α (.12%) | 241Am | | 246Bk | 97 | 149 | 246.06867(6) | 1.80(2) d | β+ (99.8%) | 246Cm | 2(−) | | α (.2%) | 242Am | | 247Bk | 97 | 150 | 247.070307(6) | 1.38(25)×103 y | α | 243Am | (3/2−) | | SF (rare) | (various) | | 248Bk | 97 | 151 | 248.07309(8)# | >300 y[6] | α | 244Am | 6+# | | 248mBk | 30(70)# keV | 23.7(2) h | 1(−) | | 249Bk[7] | 97 | 152 | 249.0749867(28) | 330(4) d | β− | 249Cf | 7/2+ | | α (.00145%) | 245Am | | SF (4.7×10−8%) | (various) | | 249mBk | 8.80(10) keV | 300 µs | (3/2−) | | 250Bk | 97 | 153 | 250.078317(4) | 3.212(5) h | β− | 250Cf | 2− | | 250m1Bk | 35.59(5) keV | 29(1) µs | (4+) | | 250m2Bk | 84.1(21) keV | 213(8) µs | (7+) | | 251Bk | 97 | 154 | 251.080760(12) | 55.6(11) min | β− | 251Cf | (3/2−)# | | α (10−5%) | 247Am | | 251mBk | 35.5(13) keV | 58(4) µs | (7/2+)# | | 252Bk | 97 | 155 | 252.08431(22)# | 1.8(5) min | β− | 252Cf | | | α | 248Am | | 253Bk | 97 | 156 | 253.08688(39)# | 10# min | β− | 253Cf | | 254Bk | 97 | 157 | 254.09060(32)# | 1# min | β− | 254Cf |
1. ^{{cite web |url=http://www.nucleonica.net/unc.aspx |title=Universal Nuclide Chart |publisher=nucleonica |registration=yes}}
2. ^Abbreviations:
EC: Electron capture
IT: Isomeric transition
SF: Spontaneous fission
3. ^"Observation of new neutron-deficient isotopes with Z ≥ 92in multinucleon transfer reactions" http://inspirehep.net/record/1383747/files/scoap3-fulltext.pdf
4. ^{{cite journal|last=Kaji|first=D.|last2=Morimoto|first2=K.|last3=Haba|first3=H.|last4=Ideguchi|first4=E.|last5=Koura|first5=H.|last6=Morita|first6=K.|date=2016|title=Decay Properties of New Isotopes 234Bk and 230Am, and Even–Even Nuclides 234Cm and 230Pu|url=https://www.researchgate.net/publication/291009584|format=PDF|journal=Journal of the Physical Society of Japan|volume=84|issue=15002|pages=015002|doi=10.7566/JPSJ.85.015002}}
5. ^{{cite journal | last = Konki | first = J. et. al. | title = Towards saturation of the electron-capture delayed fission probability: The new isotopes 240Es and 236Bk | journal = Physics Letters B | volume = 764 | pages = 265–270 | date = 10 Jan 2017 | issn = 0370-2693 | doi = 10.1016/j.physletb.2016.11.038 | bibcode=2017PhLB..764..265K}}
6. ^{{Cite journal | last1 = Milsted | first1 = J. | last2 = Friedman | first2 = A. M. | last3 = Stevens | first3 = C. M. | doi = 10.1016/0029-5582(65)90719-4 | title = The alpha half-life of berkelium-247; a new long-lived isomer of berkelium-248 | journal = Nuclear Physics | volume = 71 | issue = 2 | pages = 299 | year = 1965 | pmid = | pmc = | bibcode = 1965NucPh..71..299M }}
7. ^Easiest isotope to synthesize
Notes - Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
- Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC, which use expanded uncertainties.
See also{{Wikipedia-Books|Berkelium}}{{-}} References - Isotope masses from:
- Isotopic compositions and standard atomic masses from:
- {{CAWIA 2003}}
- {{CIAAW 2005}}
- Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
- {{NUBASE 2003}}
- {{NNDC}}
- {{CRC85|chapter=11}}
{{Navbox element isotopes}} 3 : Berkelium|Isotopes of berkelium|Lists of isotopes by element |