Cooling effect in emissions of 103mRh excited by bremsstrahlung

TL;DR

This study observes temperature-dependent nonlinear emissions from 103mRh nuclei excited by bremsstrahlung, revealing phase-transition-like behavior and potential collective nuclear states at low temperatures.

Contribution

It reports the discovery of temperature-induced emission profile narrowing and phase transition-like behavior in 103mRh, suggesting collective nuclear states at low temperatures.

Findings

Emission profiles narrow at 77 K

Profiles revert at room temperature

Indications of collective nuclear states

Abstract

Nonlinear characteristic emissions of K alpha, K beta and gamma with a significant triplet splitting at room temperature are observed from the long-lived nuclear state of 103mRh excited by bremsstrahlung irradiation. A pronounced phase-transition-like narrowing of the emission profiles occurs immediately after the sample is cooled down to 77 K. The room temperature profiles reappear again abruptly and almost reversibly as the temperature drifts freely back to approximately the ice point after the filling of liquid nitrogen is stopped. These emission properties at 300 K and at low temperature may indicate that the 103mRh nuclei are in collective states.