Joaquim Correia

A four-detector spectrometer for e−−γ PAC on-line with the ISOLDE-CERN isotope separator

Abstract A four-detector e−−γ spectrometer has been installed on-line with the ISOLDE isotope separator. The spectrometer consists of two magnetic lenses for detection of conversion electrons, and two BaF2 scintillators for γ-ray detection. The spectrometer has been equipped with a 20 kV pre-acceleration system which enables detection of conversion electrons down to 2 keV. Implantation and measurement can be performed simultaneously on a large temperature range by heating or cooling the sample holder. The advantages of using the e−−γ PAC technique on-line at ISOLDE are discussed.

Microscopic studies of radioactive Hg implanted in YBa 2Cu3O6 + x superconducting thin films

Abstract YBa 2 Cu 3 O 6+ x (YBCO) superconducting thin films implanted with low doses of radioactive 197m Hg and 199m Hg isotopes were studied with a combination of nuclear and non-nuclear characterization techniques. We show that after implantation Hg lies on a unique site in the YBCO lattice and the critical temperature increases slightly with the increase of the 197 Au concentration from the nuclear transmutation of 197 Hg.

Trisomy 15 mosaicism: Challenges in prenatal diagnosis

Keywords: trisomy 15 mosaicism; fetal mosaicism; chorionic villi; prenatal cytogenetics; SNP-array; uniparental disomy