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A Study of γ-ray Polarisation Measurements Using COMPEX Ge-Detector Modules

Anand, Vanshika LU (2025) FYSK04 20251
Department of Physics
Particle and nuclear physics
Abstract
A setup using two of the novel COMPEX composite Ge-detectors was assessed for its sensitivity for γ-ray polarisation studies. Two slightly different configurations were considered with angles of 90° and 180° between COMPEX 2 and COMPEX 3, using a standard calibration 60Co source. Measurements were performed with the two detectors in coincidence mode, and the resulting signals were digitised using the 100 MHz SIS3302 Struck digitisers. The data processing, calibration, and coincidence analysis was performed using the ROOT-based Go4 framework. COMPEX 3 was used as a trigger to select specific 60Co transitions in COMPEX 2, allowing for comparisons of vertical and horizontal scattering counts within the latter. A ratio of horizontal to... (More)
A setup using two of the novel COMPEX composite Ge-detectors was assessed for its sensitivity for γ-ray polarisation studies. Two slightly different configurations were considered with angles of 90° and 180° between COMPEX 2 and COMPEX 3, using a standard calibration 60Co source. Measurements were performed with the two detectors in coincidence mode, and the resulting signals were digitised using the 100 MHz SIS3302 Struck digitisers. The data processing, calibration, and coincidence analysis was performed using the ROOT-based Go4 framework. COMPEX 3 was used as a trigger to select specific 60Co transitions in COMPEX 2, allowing for comparisons of vertical and horizontal scattering counts within the latter. A ratio of horizontal to vertical counts of 0.93(11) and 1.00(11) were observed for 90◦ and 180◦ respectively. With the available statistics, no measurable polarisation sensitivity was deduced. It was concluded that measurements must be performed with a considerably higher-activity source to improve the statistical significance of the results and draw final conclusions on the sensitivity of the set-up. (Less)
Popular Abstract
The Nuclear Structure Group at Lund University has recently come into possession of the novel state-of-the-art COMPEX detectors, with broad applications to studies ranging from nuclear structure to environmental measurements. Theoretically, the nucleus of an atom is described as having a similar structure to the atoms they are contained in.

Polarisation studies can be performed to determine these energy levels experimentally in the field, often with a set up using composite (containing several crystals) detectors. Such a set-up using the new COMPEX detectors was investigated for its sensitivity for polarisation studies. It was not possible to conclude firmly on the subject due to the low amount of statistics collected within the project... (More)
The Nuclear Structure Group at Lund University has recently come into possession of the novel state-of-the-art COMPEX detectors, with broad applications to studies ranging from nuclear structure to environmental measurements. Theoretically, the nucleus of an atom is described as having a similar structure to the atoms they are contained in.

Polarisation studies can be performed to determine these energy levels experimentally in the field, often with a set up using composite (containing several crystals) detectors. Such a set-up using the new COMPEX detectors was investigated for its sensitivity for polarisation studies. It was not possible to conclude firmly on the subject due to the low amount of statistics collected within the project duration. Measurement time must be increased, or a source that is more active must be used to draw statistically significant results. (Less)
Please use this url to cite or link to this publication:
author
Anand, Vanshika LU
supervisor
organization
course
FYSK04 20251
year
type
M2 - Bachelor Degree
subject
language
English
id
9200842
date added to LUP
2025-06-24 13:57:11
date last changed
2025-06-24 13:57:11
@misc{9200842,
  abstract     = {{A setup using two of the novel COMPEX composite Ge-detectors was assessed for its sensitivity for γ-ray polarisation studies. Two slightly different configurations were considered with angles of 90° and 180° between COMPEX 2 and COMPEX 3, using a standard calibration 60Co source. Measurements were performed with the two detectors in coincidence mode, and the resulting signals were digitised using the 100 MHz SIS3302 Struck digitisers. The data processing, calibration, and coincidence analysis was performed using the ROOT-based Go4 framework. COMPEX 3 was used as a trigger to select specific 60Co transitions in COMPEX 2, allowing for comparisons of vertical and horizontal scattering counts within the latter. A ratio of horizontal to vertical counts of 0.93(11) and 1.00(11) were observed for 90◦ and 180◦ respectively. With the available statistics, no measurable polarisation sensitivity was deduced. It was concluded that measurements must be performed with a considerably higher-activity source to improve the statistical significance of the results and draw final conclusions on the sensitivity of the set-up.}},
  author       = {{Anand, Vanshika}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{A Study of γ-ray Polarisation Measurements Using COMPEX Ge-Detector Modules}},
  year         = {{2025}},
}