Supernova-Produced Mn 53 on Earth
Year: 2020
Type: article
Abstract: For the time period from 1.5 to 4 Myr before the present we found in deep ocean ferromanganese crusts a $^{53}\mathrm{Mn}$ excess concentration in terms of $^{53}\mathrm{Mn}/\mathrm{Mn}$ of about $4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}14}$ over that expected for cosmogenic production. We conclude that this $^{53}\mathrm{Mn}$ is of supernova origin because it is detected in the same time window, about 2.5 Myr ago, where $^{60}\mathrm{Fe}$ has been found earlier. This overabundance confirms the supernova origin of that $^{60}\mathrm{Fe}$. For the first time, supernova-formed $^{53}\mathrm{Mn}$ has been detected and it is the second positively identified radioisotope from the same supernova. The ratio $^{53}\mathrm{Mn}/^{60}\mathrm{Fe}$ of about 14 is consistent with that expected for a SN with a $11--25\text{ }\text{ }{\mathrm{M}}_{\ensuremath{\bigodot}}$ progenitor mass and solar metallicity.
Source: Physical Review Letters
Language: Latvian
Topic: Astro and Planetary Science
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: Deutsche Forschungsgemeinschaft
OpenAlex ID: W3043597490