Examples of direct emission of Ν-rays after capture of a Μ-meson by an argon nucleus

Conclusion

It is concluded that the events arise from the formation of a previously unknown isomeric state of⁴⁰C1.

It is to be noticed, that if the isomeric explanation is correct it may be necessary to take this phenomenon into account in the calculations of neutron multiplicity after capture of a negative Μ-meson by a nucleus.

It is intended to verify the existence of the supposed isomeric state by bombarding our cloud chamber, filled with argon, with neutrons from a Cockcroft-Walton accelerator in this department. The n-p reaction will create⁴⁰Cl, and if the isomeric state exists, electron tracks, associated with the ends of the recoil protons, should be visible. It is hoped in this way to find the correct interpretation of these three events.