# München 2006 – wissenschaftliches Programm

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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 **^{210}**Po** — •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 ^{210}Po,
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).