Internal Pair Conversion

Anomalous Internal Pair Conversion Signaling Elusive Light Neutral Particles

Abstract. In this paper we report on a systematic search for a neutral boson in the mass range between 5 and 15 MeV/c2 in the decay of highly excited nuclei. Its signature is found a deviation in the angular correlation of the e+e− pairs from conventional internal pair conversion (IPC) resulting from of its two-body decay kinematics. With an e+e− pair-spectrometer, a number of transitions has b...

Angular correlations in internal pair conversion of aligned heavy nuclei.

We calculate the spatial correlation of electrons and positrons emitted by internal pair conversion of Coulomb excited nuclei in heavy ion collisions. The alignment or polarization of the nucleus results in an anisotropic emission of the electron-positron pairs which is closely related to the anisotropic emission of γ-rays. However, the angular correlation in the case of internal pair conversio...

0 A ug 1 99 5 Angular Correlations in Internal Pair Conversion of Aligned Heavy Nuclei

We calculate the spatial correlation of electrons and positrons emitted by internal pair conversion of Coulomb excited nuclei in heavy ion collisions. The alignment or polarization of the nucleus results in an anisotropic emission of the electron-positron pairs which is closely related to the anisotropic emission of γ-rays. However, the angular correlation in the case of internal pair conversio...

Inverse internal conversion of laser - heated C

Internal state conversion in ultracold gases.

We consider an ultracold gas of (noncondensed) bosons or fermions with two internal states, and we study the effect of a gradient of the transition frequency between these states. When a pi/2 rf pulse is applied to the sample, exchange effects during collisions transfer the atoms into internal states which depend on the direction of their velocity. This results, after a short time, in a spatial...