Razlika između verzija stranice "Borij"

Borij nema stabilnih niti prirodnih izotopa. Sintetizirano je nekoliko radioaktivnih izotopa u laboratoriji, bilo putem fusije dva atoma ili detekcijom izotopa tokom raspada nekog težeg elementa. Do danas poznato je 12 različitih izotopa borija sa [[atomska masa|atomskim masama]] 260–262, 264–267, 270–272, 274 i 278, među kojim se za borij-262 zna da ima još jedno [[nuklearni izomer|metastabilno stanje]]. Postojanje svih navedenih izotopa je potvrđeno eksperimentima, osim izotopa ²⁷⁸Bh. Svi izotopi se raspadaju isključivo alfa raspadom, mada se za neke, još neotkrivene, izotope predviđa da bi se mogli raspadati spontanom fisijom.<ref name=nuclidetable/>

 

 

The proton-rich isotopes with masses 260, 261, and 262 were directly produced by cold fusion, those with mass 262 and 264 were reported in the decay chains of meitnerium and roentgenium, while the neutron-rich isotopes with masses 265, 266, 267 were created in irradiations of actinide targets. The five most neutron-rich ones with masses 270, 271, 272, 274, and 278 (unconfirmed) appear in the decay chains of ²⁸²Nh, ²⁸⁷Mc, ²⁸⁸Mc, ²⁹⁴Ts, and ²⁹⁰Fl respectively. These eleven isotopes have half-lives ranging from about ten&nbsp;milliseconds for ^262mBh to about one&nbsp;minute for ²⁷⁰Bh and ²⁷⁴Bh, extending to about twelve minutes for the unconfirmed ²⁷⁸Bh, one of the longest-lived known superheavy nuclides.<ref name="Doi_"/>