Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Right on target: Short-lived nuclei can be efficiently trapped for study in the electron beam of a high-energy electron storage ring

Figure 1: The SCRIT nuclear target permits electron scattering measurements to be performed on short-lived (radioactive) nuclei. The trap makes use of the electron beam in a high-energy electron storage ring. Cesium ions are confined transversely by the electron beam (green dots) and longitudinally by an electrostatic potential (indicated by the grey grid).
Figure 1: The SCRIT nuclear target permits electron scattering measurements to be performed on short-lived (radioactive) nuclei. The trap makes use of the electron beam in a high-energy electron storage ring. Cesium ions are confined transversely by the electron beam (green dots) and longitudinally by an electrostatic potential (indicated by the grey grid).

Abstract:
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.

Right on target: Short-lived nuclei can be efficiently trapped for study in the electron beam of a high-energy electron storage ring

Japan | Posted on September 12th, 2008

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

1. 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 |

####

For more information, please click here

Copyright © Riken

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Oxford Instruments systems now facilitate water purification technology September 27th, 2016

Dr Barbara Armbruster promoted to Worldwide Sales and Marketing Director for XEI Scientific September 27th, 2016

Fighting cancer with sticky nanoparticles September 27th, 2016

Gold nanoparticles conjugated quercetin inhibits epithelial-mesenchymal transition, angiogenesis and invasiveness via EGFR/VEGFR-2 mediated pathway in breast cancer September 27th, 2016

Physics

New breed of optical soliton wave discovered September 9th, 2016

NREL discovery creates future opportunity in quantum computing: Research into perovskites looks beyond material's usage for efficient solar cells September 9th, 2016

Location matters in the self-assembly of nanoclusters: Iowa State University scientists have developed a new formulation to explain an aspect of the self-assembly of nanoclusters on surfaces that has broad applications for nanotechnology September 8th, 2016

University of Akron researchers find thin layers of water can become ice-like at room temperature: Results could lead to an assortment of anti-friction solutions August 30th, 2016

Discoveries

Fighting cancer with sticky nanoparticles September 27th, 2016

Gold nanoparticles conjugated quercetin inhibits epithelial-mesenchymal transition, angiogenesis and invasiveness via EGFR/VEGFR-2 mediated pathway in breast cancer September 27th, 2016

UNAM develops successful nano edible coating which increases life food September 27th, 2016

Crystalline Fault Lines Provide Pathway for Solar Cell Current: New tomographic AFM imaging technique reveals that microstructural defects, generally thought to be detrimental, actually improve conductivity in cadmium telluride solar cells September 26th, 2016

Announcements

Oxford Instruments systems now facilitate water purification technology September 27th, 2016

Dr Barbara Armbruster promoted to Worldwide Sales and Marketing Director for XEI Scientific September 27th, 2016

Fighting cancer with sticky nanoparticles September 27th, 2016

Gold nanoparticles conjugated quercetin inhibits epithelial-mesenchymal transition, angiogenesis and invasiveness via EGFR/VEGFR-2 mediated pathway in breast cancer September 27th, 2016

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic