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Dr. Julia Even vom HelmholtzInstitut Mainz und Dr. Hiromitsu Haba von RIKEN, Wako, Japan bereiten den mit Gas gefüllten GARISSeparator (oben rechts) vor für die Ankopplung der Kammer, die die Schnittstelle zur Chemieapparatur bildet (unten Mitte). Graphische Darstellung eines SeaborgiumhexacarbonylMoleküls auf den mit Siliziumdioxid bedeckten Detektoren der COMPACTDetektorapparatur.

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The first plant system components were delivered yesterday to the ITER construction site in Saint PaullezDurance, France.

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Calculating the binding energy between hyperon particles contributes to understanding a new type of neutron star.

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Researchers have come one step closer to understanding unstable atomic nuclei. A team of researchers from RIKEN, the University of Tokyo and other institutions in Japan and Italy has provided evidence for a new nuclear magic number in the unstable, radioactive calcium isotope 54Ca. In a study published ...

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The stability of atoms can vary considerably from one element to the next, and also between isotopes of the same element (whose nuclei contain the same number of protons but different numbers of neutrons). While many isotopes are unstable and rapidly undergo radioactive decay, certain 'magic' isotopes ...

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Using an attractive surface delta interaction we obtain wave functions for two protons (or proton holes) in the ${f}_{5/2}$ and ${p}_{3/2}$ shells. We take the singleparticle energies to be degenerate. We obtain the remarkable result that the $g$ factors of the lowest ${2}^{+}$ and the lowest ${4}^{+}$ states are equal to 1. We find that only the orbital part of the $g$ factors contributes\char22{}the spin part cancels out. Shellmodel calculations are also performed for these same $g$ factors in a larger model space and with realistic effective interactions.

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UlfG. Meißner et al, Int. J. Mod. Phys. E 23, 1461005 (2014) [8 pages] DOI: 10.1142/S0218301314610059

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Learn more about High Flux Isotope Reactor named Nuclear Historic Landmark at ornl.gov

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Spallation facility in Sweden should be up and running in 2023

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The nucleus at the heart of an atom is held together by a subtle balance between the nuclear force that binds protons and neutrons and the electric repulsion that tries to fling the positively charged protons apart. Understanding how the number of nucleons—the collective term for protons and neutrons—affects ...

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A team of researchers from the RIKEN Nishina Center for AcceleratorBased Science in Japan has demonstrated that the magic numbers 20 and 28 disappear from all neutronrich magnesium isotopes, thereby establishing a new, larger area of nuclear deformation in the nuclear chart.

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The $N=20$ and $N=28$ ``islands of inversion'' are described by large scale shell model calculations with an extension of the interaction SDPFU that makes it possible to mix configurations with different $\mathrm{N}$\hbar${}$\omega${}$ or equivalently with different numbers of particles promoted from the $sd$ shell to the $pf$ shell. It allows to connect the classical $sd$shell calculations below $N=18$ with the $sd$ (protons)$pf$ (neutrons) calculations beyond $N=24\char21{}26$, for all the isotopes from oxygen to sulfur, using the same interaction. For some isotopes this range contains all the nuclei between the proton and the neutron drip lines and includes the $N=20$ and $N=28$ islands of inversion. We pay particular attention to the properties of the states at fixed $\mathrm{N}$\hbar${}$\omega${}$ which turn out to be the real protagonists of the physics at $N=20$. The existence of islands of inversion or deformation are explained as the result of the competition between the spherical mean field which favors the $0$\hbar${}$\omega${}$ configurations and the nuclear correlations which favor the deformed $N$\hbar${}$\omega${}$ configurations. The magnesium chain is exceptional because in it the $N=20$ and $N=28$ islands of inversion merge, enclosing all the isotopes between $N=19$ and $N=30$. Indeed, this would be also the case for the neon and sodium chains if their drip lines would reach $N=28$.

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Sergey Dubovichenko and Albert DzhazairovKakhramanov, Int. J. Mod. Phys. E 23, 1430012 (2014) [55 pages] DOI: 10.1142/S0218301314300124

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