submit news    HOME | FEEDBACK  


« NAVIGATION »
NEWS

- Bio/Medicine

- Chemicals

- Defense

- Drug Delivery

- Education

- Electronics

- Energy

- Events

- Grants

- Industry

- Investment

- Litigation

- Materials

- MEMS

- Nanofabrication

- Nanoparticles

- Nanotubes

- Optics

- Partnership

- Patent

- Products

- Quantum dots

- Research

- Smart Dust

- Software
COMPANIES
EVENTS

- Browse by Month

- Current Shows

- Previous Shows

- Submit Events
FEEDBACK
ADVERTISE
LINK TO US

« PARTNERS »
Become A Nanotechwire Partner

FEI Company

Veeco Instruments

Nano Science and Technology Institute

National Nanotechnology Initiative

Nanotechnology at Zyvex

Want to see your Company or Organization listed above? Become A Nanotechwire Partner Today - click here
« NEWSLETTER »



« SEARCH »







9/12/2008 6:12:59 PM
Short-lived nuclei can be efficiently trapped for study in the electron beam of a high-energy electron storage ring

A team of Japanese researchers has developed a technique that will enable the study of the internal structure of unstable (radioactive) nuclei with electron scattering1.

In an electron scattering measurement an electron is accelerated up to several hundreds of MeV (106 eV) and scatters from a charged nucleus. “This technique is the only way to determine precisely—and model independently—the proton distribution in a nucleus,” explains Masanori Wakasugi from the RIKEN Nishina Center for Accelerator-Based Science in Wako. “Electron scattering measurements have greatly contributed to the establishment of nuclear structure models that are written in current textbooks.”

It has not been possible, however, to use this technique to study short-lived nuclei because of the difficulty in confining a sufficiently large number of such nuclei in a target. What this means in practice is that the collision luminosity—a measure of how likely an electron is to scatter from a nucleus—for unstable nuclei has to be quite high.

The team designed a high-luminosity target in the Kaken electron storage ring at Kyoto University that takes advantage of the ion-trapping potential of the circulating electron beam (Fig. 1). Cesium (Cs1+) ions were accelerated up to 4.05 keV and injected into the electron beam in a region that forms the target. The target, named SCRIT (self-confining radioactive isotope ion target), is about 200 mm long and made up of 40 longitudinally stacked, thin electrodes that can trap the ions in an electronic potential. Because the target ions are confined within a region that is the same size as the electron beam, it is possible to achieve a high luminosity even with a small number of ions.

Specially designed detectors determine the ionization state of the Cs ions and the energy and trajectory of the scattered electrons. The team determined that the Cs ions remain trapped for about 85 ms and that the electrons have a high probability of interaction with the trapped ions indicating a high luminosity. Although the experimentally measured luminosity is about 40 times lower than would be needed to perform electron scattering on unstable nuclei, a higher electron beam current could make up the difference.

The study of nuclei far from stability may ultimately help in developing a general theory of nuclei, according to Wakasugi. In addition, unstable nuclei play an important role in nucleo-synthesis. The SCRIT would enable radioactive nuclei with a half-life of as little as 100 ms to be studied.

Reference Wakasugi, M., Emoto, T., Furukawa, Y., Ishii, K., Ito, S., Koseki, T., Kurita, K., Kuwajima, A., Masuda, T., Morikawa, A., et al. Novel internal target for electron scattering off unstable nuclei. Physical Review Letters 100, 164801 (2008). | article |

Other Headlines from Riken ...
 - Electrons set free
 - Nano-aquarium opens up a new realm of research into microorganisms
 - ‘Cell surgery’ using nano-beams
 - Nanotechnology points the way to greener pastures
 - Calculations can now predict when and how spins of electrons and ions arrange in one-dimensional multiferroic materials

More Research Headlines ...
 - Experiments Settle Long-Standing Debate about Mysterious Array Formations in Nanofilms
 - "Critical baby step" taken for spying life on a molecular scale
 - Seeing an atomic thickness
 - First-ever sub-nanoscale snapshots of renegade protein in Huntington's Disease
 - Karlsruhe Invisibility Cloak: Disappearing Visibly


« Back To List »

« GET LISTED »
- submit company
- submit news
- submit events
- advertise here

« EVENTS »
- More Events


Copyright © 2014 Nanotechwire.com | Privacy Policy |