Archive for May, 2011

Why does carbon-14 have a very long half-life?

May 30th, 2011

The long half-life of C-14 is very useful in that it allows archaeologists to date ancient objects back to about 60,000 years. But why exactly is the half-life of carbon-14 so long? Other light nuclei have much shorter half-lives in the range seconds to minutes (see neighbouring nuclides in the Karlsruhe Nuclide Chart). This puzzle has recently been resolved in a paper just published in Phys. Rev. Letts.
References
P. Maris, J. Vary, P. Navrátil, W. Ormand, H. Nam, D. Dean. Origin of the Anomalous Long Lifetime of ^{14}C. Physical Review Letters, 2011; 106 (20) DOI: 10.1103/PhysRevLett.106.202502, pdf

See also Karlsruhe Nuclide Chart

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New half-life data for 29 neutron rich isotopes

May 26th, 2011

Daugas et al. (Phys. Rev. C 83, 054312, 2011) have presented new ß-decay measurements for N> 40 Mn nuclei. In total, half-lives for 29 isotopes have been determined. New data on the half-lives of Ti-61, V-64, and Fe-71 have been obtained. New data on ß-delayed gammas rays and branching for ß-delayed neutron emission have also been obtained.
Reference

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Eleven new heavy isotopes discovered for Z=105 to Z=117

May 26th, 2011

Organessian et al (Phys. Rev. C 83, 054315 (2011) have reported the observation of 11 new heay isotopes of elements Z = 105 to Z = 117. These new isotopes have been discovered in the reaction products of 249Bk + 48Ca reactions.
Reference

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Presentation on Nucleonica at STAR Network of Excellence

May 22nd, 2011

STAR – STrategy for Allied Radioecology – is a recently launched Network of Excellence funded by the EC until the end of 2015. The STAR project will bring together experts in radioecology from all over Europe to develop the future directions of radioecology. This meeting was held on 17-20 May 2011 in Helsinki in the premises of the Radiation and Nuclear Safety Authority (STUK).
The Nucleonica team were invited to make a presentation on Implemeting Education and Training: Nuclear Knowledge and Data Disseminaiton with Nucleonica.
There are currently nine partners in the STAR project from eight European countries. The project coordinator is IRSN inh France. STUK, the Finnish partner is responsible for the workpackage dealing with strategic agenda, integration and infrastructures.
STAR website

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ITRAC-3 Training Course proceedings now online..

May 22nd, 2011

The proceedings of the ITRAC-3 training course on Illicit Trafficking and Radiological Consequenses are now online. This course took place on the 11-13 May in Karlsruhe. Guest speakers included Dr. Andrey Berlizov from the IAEA’s Safeguards department. ITU speakers included K. Mayer, M. Wallenius, J. Galy, J. Zsigrai, and E. Hrnecek. From the Nucleaona team speakers included J. Magill and R. Dreher.
In total, 21 participants from Switzerland, Turkey, Macedonia, Azerbaijan, Latvia, Romania, and Belgium took part in the course. The course organisers acknowledge the financial assistance from the JRC’s Enlargement and Integration Action (E&IA) which provided funding for participants from Candidate Countries, Potential Candidate Countries, and ENP Countries.
A highlight of the training course was a live demonstation on how to create a gamma spectrum for the emissions from the Fukushima reactor accident. In a first step, a reactor simulation was performed using webKORIGEN to determine the strongest gamma emitting nuclides. With these nuclides a nuclide mixture was then created. Thereafter, using the gamma spectrum generator, gamma spectra were produced for both NaI and HPGe detectors. Finally it was shown how these spectra could be analaysed using the Nucleonica tools Cambio and WESPA.
More information…

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Nucleonica welcomes IAEA users

May 16th, 2011

Nucleonica has launched a trial period for all IAEA users for the Premium package. Full access has been given to all the modules and features. We hope to encourage as many IAEA users as possible to experience Nucleonica during this period. Nucleonica will be of interest to professionals for everyday calculations. In addition, it provides a large range of modules and tools for use in training courses and is ideal for education and training purposes in the nuclear sciences.

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Nucleonica Standalone for Bundesamt für Strahlenschutz

May 9th, 2011

The Federal Office for Radation Protection in Germany (Bundesamt für Strahlenschutz – BfS) has recently ordered a standalone version of Nucleonica for use on notebook computers “in the field” where there may be no internet connection available. The standalone version is based on the use of a virtual server resident on the notebooks. After launching the virtual server, all Nucleonica applications are available through the use of a browser such as Internet Explorer, Firefox or Chrome without access to the internet. This innovative development has been made possible through the latest virtualisation technology now available.

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Nucleonica welcomes SCK-CEN users!

May 6th, 2011

Through an institutional license agreement, staff at the SCK-CEN in Belgium has now full Premium access to the Nucleonica modules and features.

The Nucleonica team looks forward to a close interaction with the SCK-CEN colleagues and encourages a strong use of the web portal.

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