Study of radiative neutron capture reaction for the unstable nucleus of ¹⁷³Lu by direct method and by surrogate reaction
type: Distribution
access URL: https://theses.hal.science/tel-00797443
format: HTML
issued: 2026-05-13T12:18:18.948693
modified: 2026-05-13T12:18:18.842578

test_moissonnage_selune
type: Agent

Study of radiative neutron capture reaction for the unstable nucleus of ¹⁷³Lu by direct method and by surrogate reaction
type: Dataset
contact point: Organization
  fn: CCSD
keyword: hauser-feshbach
keyword: cross-section
keyword: infoeu-reposemanticsdoctoralthesis
keyword: compound-nucleus
keyword: surrogate-method
keyword: distribution-de-spin
keyword: spin-distribution
keyword: modele-de-reaction
keyword: section-ecace
keyword: matrice-r
keyword: reaction-model
keyword: capture-neutronique-radiative
keyword: r-matrix
keyword: evaluations
keyword: methode-de-substitution
keyword: radiative-neutron-capture
keyword: noyau-compose
keyword: theses
keyword: physcondcm-genphysics-physicscondensed-matter-cond-matother-cond-matother
landing page: https://theses.hal.science/tel-00797443
description: This PhD report presents a study of radiative neutron capture reaction of the ¹⁷³Lu to determine the (n,γ) cross section. Contrary to stable nuclei for which a huge amount of data is available, there is a real lack of information for radioactive nuclei. The ﬁrst part of this PhD focuses on the presentation of different formalisms involved in cross section calculations and on the use of TALYS code based on these models. TALYS allowed us to evaluate the (n,γ) cross section on ¹⁷³Lu with data from the capture reaction on the ¹⁷⁵Lu. In a second step, the (n,γ) cross section on ¹⁷³Lu was measured at the LANSCE facility with the 4π detector DANCE. This experience turned out to be a real challenge for both the target production of ¹⁷³Lu and for obtaining data due to the high radioactivity of this isotope. Interesting informations have been extracted such as the total capture yield, the identiﬁcation and the characterization of new resonances, the determination of parameters like average spacing, neutron and γ widths and the value of the density function. All these new informations enabled us to reconstruct the (n,γ) cross section on ¹⁷³Lu up to 200 eV. We could then estimate a correction for the cross section evaluated by TALYS in order to obtain a new evaluation. The third part of this PhD deals with getting additionnal information on the ¹⁷³Lu(n,γ)¹⁷⁴Lu reaction by using the surrogate method. Firstly, this technique has been tested on a well-known reaction : ¹⁷⁵Lu(n,γ)¹⁷⁶Lu with the reaction ¹⁷⁴Yb(³He,p)¹⁷⁶Lu. Secondly, we studied the ¹⁷³Lu(n,γ)¹⁷⁴Lu reaction with the ¹⁷⁴Yb(³He,t)¹⁷⁴Lu reaction. The γ decay probability in different ways have been measured and compared with a TALYS calculation. This comparison showed large discrepancies between the transfer reactions and the reactions induced by neutrons. Then our investigation was focused on the spin distribution of the formed compound nucleus. It has been extracted thanks to a ﬁt of the measured γ decay probability. Thi…
identifier: NNT: 2013PA112015
issued: 2026-05-13T12:18:18.891425
language: fr
modified: 2026-05-13T12:18:18.891431