Demonstration of nuclear gamma-ray polarimetry based on a multi-layer CdTe Compton camera

Area of Science:

• Nuclear Physics and Spectroscopy
• Detector Technology and Instrumentation

Background:

• Systematic study of nuclear levels with firm spin-parity assignments is crucial for detecting and tracking structural changes in atomic nuclei.
• Traditional linear polarization measurements for determining the electromagnetic character of gamma-ray transitions are limited by low detection system efficiency.

Purpose of the Study:

• To demonstrate the capability of a multi-layer Cadmium-Telluride (CdTe) Compton camera as a state-of-the-art gamma-ray polarimeter for nuclear spectroscopy.
• To overcome the limitations of existing methods by leveraging high position sensitivity and detection efficiency.

Main Methods:

• Utilized a multi-layer Cadmium-Telluride (CdTe) Compton camera as a gamma-ray polarimeter.
• Employed polarized 847-keV gamma rays produced by the [Formula: see text]([Formula: see text]) reaction for detector calibration and performance evaluation.
• Combined experimental data with simulated calculations to obtain the modulation curve for gamma rays.

Main Results:

• Successfully demonstrated the reliable operation of the CdTe Compton camera as a gamma-ray polarimeter.
• Achieved remarkably high polarization sensitivity, comparable to a reasonable detection efficiency.
• Obtained a clear modulation curve for the 847-keV gamma rays.

Conclusions:

• The multi-layer CdTe Compton camera is a highly effective tool for gamma-ray polarimetry in nuclear spectroscopy.
• This technology offers a significant improvement over traditional methods, enabling more precise studies of nuclear structure.
• The results pave the way for future advancements in gamma-ray polarimetry techniques.