Isotop einsteinium

Einsteinium (₉₉Es) adalah sebuah unsur buatan, sehingga berat atom standarnya tidak dapat diberikan. Seperti semua unsur buatan, ia tidak memiliki satu pun isotop stabil. Isotop pertama yang ditemukan (dalam luruhan nuklir dari pengujian bom H Ivy Mike) adalah ²⁵³Es pada tahun 1952. Ada 18 radioisotop yang diketahui, mulai dari ²⁴⁰Es hingga ²⁵⁷Es, dan 3 isomer nuklir (^250mEs, ^254mEs, dan ^256mEs). Isotop yang berumur paling panjang adalah ²⁵²Es dengan waktu paruh 471,7 hari, atau sekitar 1,293 tahun.

Daftar isotop

|- | rowspan=2|²⁴⁰Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 141 | rowspan=2|240,06892(43)# | rowspan=2|6(2) dtk^[1] | α | ²³⁶Bk | rowspan=2| |- | β⁺ (langka) | ²⁴⁰Cf |- | rowspan=2|²⁴¹Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 142 | rowspan=2|241,06854(24)# | rowspan=2|10(5) dtk
[8(+6−5) dtk] | α | ²³⁷Bk | rowspan=2|(3/2−) |- | β⁺ (langka) | ²⁴¹Cf |- | rowspan=3|²⁴²Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 143 | rowspan=3|242,06975(35)# | rowspan=3|13,5(25) dtk | α (99,94%) | ²³⁸Bk | rowspan=3| |- | β⁺, SF (0,6%) | (beberapa) |- | β⁺ (langka) | ²⁴²Cf |- | rowspan=2|²⁴³Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 144 | rowspan=2|243,06955(25)# | rowspan=2|21(2) dtk | β⁺ (70%) | ²⁴³Cf | rowspan=2|3/2−# |- | α (30%) | ²³⁹Bk |- | rowspan=3|²⁴⁴Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 145 | rowspan=3|244,07088(20)# | rowspan=3|37(4) dtk | β⁺ (94,69%) | ²⁴⁴Cf | rowspan=3| |- | α (5,3%) | ²⁴⁰Bk |- | β⁺, SF (0,01%) | (beberapa) |- | rowspan=2|²⁴⁵Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 146 | rowspan=2|245,07132(22)# | rowspan=2|1,1(1) mnt | β⁺ (60%) | ²⁴⁵Cf | rowspan=2|(3/2−) |- | α (40%) | ²⁴¹Bk |- | rowspan=3|²⁴⁶Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 147 | rowspan=3|246,07290(24)# | rowspan=3|7,7(5) mnt | β⁺ (90,1%) | ²⁴⁶Cf | rowspan=3|4−# |- | α (9,9%) | ²⁴²Bk |- | β⁺, SF (0,003%) | (beberapa) |- | rowspan=3|²⁴⁷Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 148 | rowspan=3|247,07366(3)# | rowspan=3|4,55(26) mnt | β⁺ (93%) | ²⁴⁷Cf | rowspan=3|7/2+# |- | α (7%) | ²⁴³Bk |- | SF (9%) | (beberapa) |- | rowspan=3|²⁴⁸Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 149 | rowspan=3|248,07547(6)# | rowspan=3|27(5) mnt | β⁺ (99,75%) | ²⁴⁸Cf | rowspan=3|2−#, 0+# |- | α (0,25%) | ²⁴⁴Bk |- | β⁺, SF (3%) | (beberapa) |- | rowspan=2|²⁴⁹Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 150 | rowspan=2|249,07641(3)# | rowspan=2|102,2(6) mnt | β⁺ (99,43%) | ²⁴⁹Cf | rowspan=2|7/2+ |- | α (0,57%) | ²⁴⁵Bk |- | rowspan=2|²⁵⁰Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 151 | rowspan=2|250,07861(11)# | rowspan=2|8,6(1) jam | β⁺ (97%) | ²⁵⁰Cf | rowspan=2|(6+) |- | α (3%) | ²⁴⁶Bk |- | rowspan=2 style="text-indent:1em" | ^250mEs | rowspan=2 colspan="3" style="text-indent:2em" | 200(150)# keV | rowspan=2|2,22(5) jam | EC (99%) | ²⁵⁰Cf | rowspan=2|1(−) |- | α (1%) | ²⁴⁶Bk |- | rowspan=2|²⁵¹Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 152 | rowspan=2|251,079992(7) | rowspan=2|33(1) jam | EC (99,51%) | ²⁵¹Cf | rowspan=2|(3/2−) |- | α (0,49%) | ²⁴⁷Bk |- | rowspan=3|²⁵²Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 153 | rowspan=3|252,08298(5) | rowspan=3|471,7(19) hri | α (76%) | ²⁴⁸Bk | rowspan=3|(5−) |- | EC (24%) | ²⁵²Cf |- | β⁻ (0,01%) | ²⁵²Fm |- | rowspan=2|²⁵³Es^[2] | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 154 | rowspan=2|253,0848247(28) | rowspan=2|20,47(3) hri | α | ²⁴⁹Bk | rowspan=2|7/2+ |- | SF (8,7%) | (beberapa) |- | rowspan=4|²⁵⁴Es | rowspan=4 style="text-align:right" | 99 | rowspan=4 style="text-align:right" | 155 | rowspan=4|254,088022(5) | rowspan=4|275,7(5) hri | α | ²⁵⁰Bk | rowspan=4|(7+) |- | EC (10⁻⁴%) | ²⁵⁴Cf |- | SF (3%) | (beberapa) |- | β⁻ (1,74%) | ²⁵⁴Fm |- | rowspan=5 style="text-indent:1em" | ^254mEs | rowspan=5 colspan="3" style="text-indent:2em" | 84,2(25) keV | rowspan=5|39,3(2) jam | β⁻ (98%) | ²⁵⁴Fm | rowspan=5|2+ |- | IT (3%) | ²⁵⁴Es |- | α (0,33%) | ²⁵⁰Bk |- | EC (0,078%) | ²⁵⁴Cf |- | SF (0,0045%) | (beberapa) |- | rowspan=3|²⁵⁵Es | rowspan=3 style="text-align:right" | 99 | rowspan=3 style="text-align:right" | 156 | rowspan=3|255,090273(12) | rowspan=3|39,8(12) hri | β⁻ (92%) | ²⁵⁵Fm | rowspan=3|(7/2+) |- | α (8%) | ²⁵¹Bk |- | SF (0,0041%) | (beberapa) |- | ²⁵⁶Es | style="text-align:right" | 99 | style="text-align:right" | 157 | 256,09360(11)# | 25,4(24) mnt | β⁻ | ²⁵⁶Fm | (1+, 0−) |- | rowspan=2 style="text-indent:1em" | ^256mEs | rowspan=2 colspan="3" style="text-indent:2em" | 0(100)# keV | rowspan=2|7,6 jam | β⁻ (99,99%) | ²⁵⁶Fm | rowspan=2|(8+) |- | β⁻, SF (0,002%) | (beberapa) |- | rowspan=2|²⁵⁷Es | rowspan=2 style="text-align:right" | 99 | rowspan=2 style="text-align:right" | 158 | rowspan=2|257,09598(44)# | rowspan=2|7,7(2) hri | β⁻ | ²⁵⁷Fm | rowspan=2|7/2+# |- | α | ²⁵³Bk

Referensi

↑ J. Konki. Towards saturation of the electron-capture delayed fission probability: The new isotopes 240 Es and 236 Bk. Physics Letters B. 10 Januari 2017. Vol. 764. hlm. 265–270. doi:10.1016/j.physletb.2016.11.038.
↑ Isotop yang paling umum

Sumber dan atribusi

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[1] J. Konki. Towards saturation of the electron-capture delayed fission probability: The new isotopes 240 Es and 236 Bk. Physics Letters B. 10 Januari 2017. Vol. 764. hlm. 265–270. doi:10.1016/j.physletb.2016.11.038.

[2] Isotop yang paling umum

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