Rhodium Mossbauer Supperadiance Induced by Liquid-Nitrogen Cooling

TL;DR

This paper reports new observations of superradiance and gamma entanglement in rhodium Mossbauer nuclei cooled with liquid nitrogen, revealing anisotropic channels, rapid recovery, and enhanced ionization effects.

Contribution

It introduces four novel experimental observations of superradiance phenomena at liquid nitrogen temperature in rhodium Mossbauer systems, expanding understanding of gamma entanglement and superradiance mechanisms.

Findings

Speed-up decay observed and recovers immediately after quenching

Simultaneous suppression of gamma and K lines during superradiance

Enhanced multiple ionizations and inelastic scattering of entangled gammas

Abstract

In the previous report, we have demonstrated cascade branching channels of the multipolar E3 transition of rhodium Mossbauer gamma via the time- and energy-resolved spectroscopy. Moreover, superradiance in the Borrmann channel from inverted nuclei gives gamma entanglement. In this letter, we report further four observations of superradiance and its associated gamma entanglement at the liquid-nitrogen temperature, i.e. (i) speed-up decay, (ii) immediate recovery of the speed-up decay after quenching, (iii) simultaneous suppression of gamma and K lines, and (iv) enhanced multiple ionizations. Anisotropic superradiant channels open by quenching and recover back immediately after quenching. Enhanced K satellites and K hypersatellites induced by cooling are attributed to the inelastic scattering of more than three entangled gammas.