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HK: Physik der Hadronen und Kerne

HK 17: Kernphysik/Spektroskopie

HK 17.3: Vortrag

Dienstag, 21. März 2006, 14:30–14:45, C

Bremsstrahlung in the α decay of ²¹⁰Po — •Heiko Scheit, Hans Boie, Vinzenz Bildstein, Frank Köck, Martin Lauer, Oliver Niedermaier, and Dirk Schwalm — MPI für Kernphysik, Heidelberg

The tunneling of an α particle through the Coulomb wall of the daughter nucleus is one of the characteristic features of α decay. The emission of bremsstrahlung in this process has attracted considerable theoretical [1-3] and experimental [4] interest due to the classically incomprehensible possibility of emission during tunneling. The differential emission probability dP/dE_γ as a function of photon energy E_γ deviates considerably from a classical treatment in which the α particle is accelerated from the classical turning point to infinity in a Coulomb potential.

Several models were proposed, treating the process quantum mechanically or semi-classically, whose predictions deviate at photon energies above about 250 keV. Nevertheless, due to the poor statistics, the data available so far [4] do not allow to distinguish between these models.

The results of a high-statistics experiment to measure the bremsstrahlung emission in the α decay of ²¹⁰Po, which ran for about 280 days with two ∼ 100 kBq sources at the MPI-K, Heidelberg, will be presented and discussed.

[1] T. Papenbrock and G. F. Bertsch, Phys. Rev. Lett. 80, 4141 (1998).

[2] M.I. Dyakonov, Phys. Rev. C 60, 037602 (1999).

[3] E. V. Tkalya, Phys. Rev. C 60, 054612 (1999).

[4] J. Kasagi et. al., Phys. Rev. Lett. 79, 371 (1997).