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Double beta radioactivity and physics of the neutrino. Study of the background noise at 3 MeV in the search of {sup 100}Mo beta beta decay; Double radioactivite beta et physique du neutrino. Etude du bruit de fond a 3 MeV dans la recherche de la desintegration beta beta du {sup 100}Mo

Abstract

Double beta decay without neutrino emission provides a test of the mass and nature of neutrinos (Majorana or Dirac). Experimental proof would be the observation of a peak at the transition energy in the spectrum of the two emitted electrons. The expected half-life of the process is extremely long (about 10{sup 25} years for {sup 100}Mo). So, being thus, it is very important to get a good knowledge of the origins and contributions of background noise in the region where the signal could occur. The main origins of the background noise in the region where the signal could occur. The main origins of the background noise are found to be e{sup +} - e{sup -} pairs induced by heavy energy gamma rays. These gamma rays follow the thermal neutron capture by the components of the detector. Another factor in the production of background noise is natural radio-activity. For example, the presence of Radon in the laboratory has been observed to produce deposits of {sup 214}Bi on the sides of the detector. Data taken with the NEMO 2 prototype and an enriched molybdenum source foil indicates that the background limit reached is of the order of 1 event per year in  More>>
Authors:
Publication Date:
May 01, 1994
Product Type:
Thesis/Dissertation
Report Number:
CRN-94-35
Reference Number:
SCA: 663210; 662430; 663560; PA: AIX-28:060342; EDB-97:122621; SN: 97001844981
Resource Relation:
Other Information: TH: These (D. es Sc.).; PBD: May 1994
Subject:
66 PHYSICS; ELECTRON-POSITRON INTERACTIONS; BACKGROUND NOISE; MOLYBDENUM 100; DOUBLE BETA DECAY; NEUTRINO DETECTION; RADIATION DETECTORS; AMERICIUM 241; BERYLLIUM 9; BISMUTH 214; CAPTURE; CESIUM IODIDES; COMPTON EFFECT; DIRAC EQUATION; GAMMA RADIATION; HALF-LIFE; IRON-GAMMA; MAJORANA THEORY; MUONS; NEUTRON REACTIONS; PHOTON BEAMS; SCREENS; SIMULATION; THALLIUM 208; X RADIATION
OSTI ID:
519796
Research Organizations:
Strasbourg-1 Univ., 67 (France). Centre de Recherches Nucleaires
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE97640453; TRN: FR9502759060342
Availability:
INIS; OSTI as DE97640453
Submitting Site:
FRN
Size:
129 p.
Announcement Date:

Citation Formats

Piquemal, F. Double beta radioactivity and physics of the neutrino. Study of the background noise at 3 MeV in the search of {sup 100}Mo beta beta decay; Double radioactivite beta et physique du neutrino. Etude du bruit de fond a 3 MeV dans la recherche de la desintegration beta beta du {sup 100}Mo. France: N. p., 1994. Web.
Piquemal, F. Double beta radioactivity and physics of the neutrino. Study of the background noise at 3 MeV in the search of {sup 100}Mo beta beta decay; Double radioactivite beta et physique du neutrino. Etude du bruit de fond a 3 MeV dans la recherche de la desintegration beta beta du {sup 100}Mo. France.
Piquemal, F. 1994. "Double beta radioactivity and physics of the neutrino. Study of the background noise at 3 MeV in the search of {sup 100}Mo beta beta decay; Double radioactivite beta et physique du neutrino. Etude du bruit de fond a 3 MeV dans la recherche de la desintegration beta beta du {sup 100}Mo." France.
@misc{etde_519796,
title = {Double beta radioactivity and physics of the neutrino. Study of the background noise at 3 MeV in the search of {sup 100}Mo beta beta decay; Double radioactivite beta et physique du neutrino. Etude du bruit de fond a 3 MeV dans la recherche de la desintegration beta beta du {sup 100}Mo}
author = {Piquemal, F}
abstractNote = {Double beta decay without neutrino emission provides a test of the mass and nature of neutrinos (Majorana or Dirac). Experimental proof would be the observation of a peak at the transition energy in the spectrum of the two emitted electrons. The expected half-life of the process is extremely long (about 10{sup 25} years for {sup 100}Mo). So, being thus, it is very important to get a good knowledge of the origins and contributions of background noise in the region where the signal could occur. The main origins of the background noise in the region where the signal could occur. The main origins of the background noise are found to be e{sup +} - e{sup -} pairs induced by heavy energy gamma rays. These gamma rays follow the thermal neutron capture by the components of the detector. Another factor in the production of background noise is natural radio-activity. For example, the presence of Radon in the laboratory has been observed to produce deposits of {sup 214}Bi on the sides of the detector. Data taken with the NEMO 2 prototype and an enriched molybdenum source foil indicates that the background limit reached is of the order of 1 event per year in the 3 MeV region. Results of this work have proven the necessity to have a magnetic field in NEMO 3 in order to reject e{sup +} - e{sup -}pairs. (author).}
place = {France}
year = {1994}
month = {May}
}