Skip to Main content Skip to Navigation
Theses

Acquisition multiparamétrique de signaux de décroissance radioactive pour la correction des défauts instrumentaux : application à la mesure de la durée de vie du 19Ne

Abstract : The aim of this thesis is to propose a method for precise half-life measurements adapted to nuclides with half-lives of a few seconds. The FASTER real-time digital acquisition system gives access to the physical characteristics of the signal induced by the detection of each decay during the counting period following beam implantation. The selection of the counting data can be carried out by an optimized post-experimental offline analysis. Thus, after establishing the influence factors impacting the measurement (pile up, gain and base line fluctuations), we are able to estimate, a posteriori, their impact on the half-life estimation. This way, we can choose the deposited energy threshold and dead time in order to minimize their effect. This thesis also proposes a method for measuring and then compensating for influence factors variations. This method was applied to estimate the 19Ne half-life with a relative uncertainty of 1.2 10-4 leading to T1 / 2 = 17.2569 (21) s. This is the most precise measurement to date for this isotope.
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-01498450
Contributor : Abes Star :  Contact
Submitted on : Thursday, March 30, 2017 - 9:57:35 AM
Last modification on : Thursday, December 12, 2019 - 3:22:58 AM

File

2017-FONTBONNE-CATHY-VO.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01498450, version 1

Citation

Cathy Fontbonne. Acquisition multiparamétrique de signaux de décroissance radioactive pour la correction des défauts instrumentaux : application à la mesure de la durée de vie du 19Ne. Physique [physics]. Normandie Université, 2017. Français. ⟨NNT : 2017NORMC204⟩. ⟨tel-01498450⟩

Share

Metrics

Record views

543

Files downloads

391