New limits on $2\epsilon$, $\epsilon {\beta }^{+}$ and $2{\beta }^{+}$ decay of ${}^{136}$Ce and ${}^{138}$Ce with deeply purified cerium sample

P. Belli, R. Bernabei, R. S. Boiko +9

A search for double electron capture ($2\epsilon$), electron capture with positron emission ($\epsilon {\beta }^{+}$), and double positron emission $2{\beta }^{+}$) in ${}^{136}$Ce and ${}^{138}$Ce…