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SUMMARY:Study of beta decay of exotic nuclei interesting for fundamental a
 nd applied physics with Total Absorption Gamma-Ray Spectroscopy (TAGS) tec
 hnique: the case of 85 Se
DTSTART:20260611T120000Z
DTEND:20260611T140000Z
DTSTAMP:20260522T165900Z
UID:indico-event-40000@indico.in2p3.fr
DESCRIPTION:Speakers: Julien Pépin (Equipe S.E.N.)\n\nThe precise knowled
 ge of beta-decay properties of neutron rich nuclei impacts several fields 
 of fundamental and applied physics\, such as nuclear structure and astroph
 ysics\, reactor antineutrino emission estimation and decay heat calculatio
 ns. \nThe beta decay databases suffer of a bias called “Pandemonium eff
 ect” which is a distortion in the attribution of feeding probability in 
 beta decay level schemes due to the low efficiency of high-resolution Germ
 anium detectors. This low efficiency penalize the detection of high energy
  gammas and gamma cascades and then the attribution of the feeding to low 
 energy levels in beta decay scheme. The solution to this problem is the To
 tal Absorption Gamma Ray Spectroscopy (TAGS) technique which is based on h
 igh efficiency detectors. This PhD work presents the realization and analy
 sis of a new TAGS measurement realized in September 2022 at the Jyväskyl
 ä accelerator in Finland. The data analysis process is presented from det
 ector calibration to subtraction of contaminants as well as the improvemen
 t of the GEANT4 simulation of the detector. The extraction of the beta fee
 ding from the new dataset is presented for one nucleus\, the 85Se. These n
 ew results are criticized and compared with previous measurements. Their i
 mpact on beta strength and mean energies calculation is assessed. \n\nhttp
 s://indico.in2p3.fr/event/40000/
LOCATION:Amphi Besse (Subatech IMT Atlantique)
URL:https://indico.in2p3.fr/event/40000/
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