Speaker
Dr
Ulrich Wahl
(Instituto Tecnológico e Nuclear ITN)
Description
This talk reports on the results from the first electron emission channeling on-line run of the ECSLI collaboration, which took place during this year’s Mn beam time in June. Using our new on-line setup which is equipped with a position-sensitive Si pad detector with fast readout system and which was mounted on the LA2 beam line, two isotopes were successfully used for beta- emission channeling experiments for the first time: 56Mn (2.58 h) and 61Co. While 56Mn was available directly, 61Co was obtained by means of implanting the short-lived precursor isotope 61Mn and exploiting the decay chain 61Mn (4.6 s)->61Fe (6 min) ->61Co (1.6 h). We were thus able to determine the lattice location of Mn in GaN and of Co in ZnO in the as-implanted state and following annealing up to 900°C. In both cases it was found that the transition metals preferred substitutional cation (i.e. Ga or Zn) sites.
In order to explore the feasibility of using the isotope 27Mg for lattice location experiments, we also did a brief test of the decay chain 27Na (295 ms)->27Mg (4.6 s). However, in this case it was found that the ISOLDE beam consisted mainly of stable 27Al, making emission channeling experiments using this isotope from UC-W surface ionization targets not feasible.
Author
Dr
Ulrich Wahl
(Instituto Tecnológico e Nuclear ITN)
Co-authors
Mrs
Ana Claudia Marques
(Centro de Física Nuclear da Universidade de Lisboa and CERN)
Mr
Carlos Pedro Marques
(Instituto Tecnológico e Nuclear ITN)
Dr
João Guilherme Correia
(Instituto Tecnológico e Nuclear ITN)
Mr
Lino Pereira
(Faculdade de Ciências, Universidade do Porto)
Prof.
Manuel Ribeiro da Silva
(Instituto Superior Tecnico and Centro de Física Nuclear da Universidade de Lisboa)
Mr
Stefan Decoster
(Instuut voor Kern- en Stralingsfysica Leuven)
Mr
Tomas Kana
(Instuut voor Kern- en Stralingsfysica)
