ELFT HÍRADÓ

[Fodor Gyula <gfodor AT rmki.kfki.hu>]

 KFKI RMKI Elméleti Főosztály Szemináriuma


 Tisztelettel meghívjuk

                Andrei Ivanov
                  (TU Wien)

"Physics of massive neutrinos and GSI anomalous
 K-shell electron capture decays"

         címmel tartandó szemináriumára.


 Helye: KFKI RMKI III. ép. Tanácsterem
 Ideje: 2009. június 5. péntek du 14.00 óra

Kivonat:

According to experimental data at GSI, the rates of the number of
   daughter ions, produced by the nuclear K--shell electron capture
   ($EC$) decays of the H--like heavy ions with on electron in the
   K--shell, such as ${^{140}}{\rm Pr}^{58+}$, ${^{142}}{\rm Pm}^{60+}$
   and ${^{122}}{\rm I}^{52+}$, are modulated in time with periods
   $T_{EC}$ of the order of a few seconds, obeying an $A$--scaling
   $T_{EC} = A/20\,{\rm s}$, where $A$ is the mass number of the mother
   nuclei, and with amplitudes $a^{EC}_d \sim 0.21$. We show that these
   data can be explained in terms of the interference of massive
   neutrino mass--eigenstates.

It is proposed a theoretical analysis of the experimental data on the
   time behaviour K--shell electron capture $(EC)$ decays of atoms
   ${^{180}}{\rm Re}$ and ${^{142}}{\rm Pm}$ in solid targets, obtained
   recently by F\"astermann {\it et al.}, Phys. Lett. B {\bf 672}, 227
   (2009) and Vetter {\it et al.}, Phys. Lett. B {\bf 670}, 149 (2008).
   It is shown that the absence of the time modulation in these data rules
   out the explanation of the ``GSI Oscillations'' by means of
   two closely spaced ground mass--eigenstates of mother nuclei of
   atoms ${^{180}}{\rm Re}$ and ${^{142}}{\rm Pm}$, respectively.


Szívesen látunk minden érdeklődőt.
                                          Fodor Gyula