Abstract
The Collinear Resonance Ionization Spectroscopy (CRIS) experiment at ISOLDE uses laser radiation to stepwise excite and ionize an atomic beam for the purpose of ultra-sensitive detection of rare isotopes, and hyperfine structure measurements. The resonance ionization technique offers the ability to purify an ion beam that is heavily contaminated with radioactive isobars (including the ground state of an isotope from its isomer) allowing decay spectroscopy to be performed.
Laser assisted nuclear decay spectroscopy is a novel technique developed at CRIS to selectively ionize nuclear ground or isomeric states present in the ISOLDE beam for radioactive-decay measurements on pure states. The isomeric ion beam is selected using a resonance of its hyperfine structure, where it is deflected to a decay spectroscopy station (DSS). This consists of a rotating wheel implantation system for alpha-decay spectroscopy, and up to three germanium detectors around the carbon-foil implantation site for gamma-ray detection. The ability of CRIS to alpha-tag the hyperfine components of overlapping structures allows the hyperfine structure of two (or more) states to be separated.
Last year, collinear resonance ionization spectroscopy and laser assisted nuclear decay spectroscopy
were performed on the neutron-deficient francium isotopes 202-207Fr. This allowed the identification of the hyperfine components of the low-lying states of 202Fr and 204Fr with alpha-spectroscopy.
Here, we present the hyperfine-structure and radioactive-decay studies from the IS471 experiment
campaign, alongside a brief overview of the CRIS beam line and the DSS.
Laser assisted nuclear decay spectroscopy is a novel technique developed at CRIS to selectively ionize nuclear ground or isomeric states present in the ISOLDE beam for radioactive-decay measurements on pure states. The isomeric ion beam is selected using a resonance of its hyperfine structure, where it is deflected to a decay spectroscopy station (DSS). This consists of a rotating wheel implantation system for alpha-decay spectroscopy, and up to three germanium detectors around the carbon-foil implantation site for gamma-ray detection. The ability of CRIS to alpha-tag the hyperfine components of overlapping structures allows the hyperfine structure of two (or more) states to be separated.
Last year, collinear resonance ionization spectroscopy and laser assisted nuclear decay spectroscopy
were performed on the neutron-deficient francium isotopes 202-207Fr. This allowed the identification of the hyperfine components of the low-lying states of 202Fr and 204Fr with alpha-spectroscopy.
Here, we present the hyperfine-structure and radioactive-decay studies from the IS471 experiment
campaign, alongside a brief overview of the CRIS beam line and the DSS.
| Original language | English |
|---|---|
| Publication status | Published - 25 Nov 2013 |
| Event | Isolde Workshop and Users meeting 2013 - The Globe, CERN, Zurich, Switzerland Duration: 25 Nov 2013 → 27 Nov 2013 https://indico.cern.ch/event/263071/ |
Conference
| Conference | Isolde Workshop and Users meeting 2013 |
|---|---|
| Country/Territory | Switzerland |
| City | Zurich |
| Period | 25/11/13 → 27/11/13 |
| Internet address |