ISOLDE Workshop and Users meeting 2006/2007

Session

Physics 1

12 Feb 2007, 16:10

Council Chamber, 503/1-001 (CERN)

Conveners

Physics 1

• Kris Heyde (Gent)

32. High-precision mass measurements of exotic nuclides: The 2006 harvest of ISOLTRAP

Dr Chabouh Yazidjian (GSI, Atomic Physics Group, Darmstadt, Germany)

12/02/2007, 16:10

In 2006 the mass measurements at the tandem Penning trap spectrometer ISOLTRAP investigated short-lived nuclides relevant for superallowed beta decays, nuclear structure, and nucleosynthesis. After the installation of a new detector [1] and a temperature stabilization system, which improved respectively the precision and the accuracy of the experiment, a new excitation scheme has been...

10. In-source Laser Photoionization Spectroscopy of Pb, Bi and Po Isotopes at ISOLDE

Dr Maxim Seliverstov (Institut fuer Physik, Johannes Gutenberg Universitaet, Mainz)

12/02/2007, 16:35

Shape coexistence at low excitation energy in nuclei has continuously shown much interest on both experimental and theoretical fronts. The region around the neutron mid-shell (N = 104) and closed proton shell (Z = 82) is of special interest. For example, in Pb at N = 104, it has been found that the three lowest lying states have 0+ as spin and parity values, these states have been...

11. Laser pumping of ions in a cooler-buncher

Bradley Cheal (The University of Manchester)

12/02/2007, 16:55

Collinear laser spectroscopy measurements of nuclear moments and mean-square charge radii at JYFL have benefited from the introduction of an ion beam cooler. The reduced energy spread of the emerging beam increases the spectral resolution while the smaller emittance allows a narrower waist of the laser-ion overlap, thus requiring less laser power. A lower background from the decreased...

23. 33Mg: determination of a negative parity intruder ground state via nuclear moments

D. T. Yordanov (Instituut voor Kern- en Stralingsfysica)

12/02/2007, 17:15

Since introduced in nuclear physics, the concept of shell structure and magic numbers has governed our understanding of nuclear matter in atomic nuclei close to stability. Experimental research in 30Ne, 31Na and 32Mg, systems with a closed neutron sd shell (N=20), provided evidence for a ground state deformation in these nuclei. The observed phenomenon is understood as an inversion of the...

28. The WITCH experiment: campaign 2006 and perspectives

Dr Valentin Kozlov (Instituut voor Kern- en Stralingsfysica)

12/02/2007, 17:35

The WITCH experiment aims to study a possible admixture of a scalar or tensor type interaction in beta decay by determining the beta-neutrino angular correlation from the shape of the recoil energy spectrum. The experimental set-up couples a double Penning trap system to form a scattering-free radioactive source and a retardation spectrometer to probe the recoil ion energy. The intensive...

26. Laser spectroscopy of radioactive copper isotopes

Dr Kieran Flanagan (KU-University of Leuven)

12/02/2007, 17:55

The evolution of nuclear structure with neutron excess in the copper isotope chain is currently under investigation by the COLLAPS collaboration. This experiment uses high-resolution laser spectroscopy, which unambiguously measures the nuclear spin and provides model-independent measurements of nuclear moments. It is therefore an ideal tool to study the nuclear structure. In the isotopes...