New approach to nuclear structure, freely available

June 01, 2016

The atomic nucleus is highly complex. This complexity partly stems from the nuclear interactions in atomic nuclei, which induce strong correlations between the elementary particles, or nucleons, that constitute the heart of the atom. The trouble is that understanding this complexity often requires a tremendous amount of computational power. In a new study published in EPJ A, Susanna Liebig from Forschungszentrum Jülich, Germany, and colleagues propose a new approach to nuclear structure calculations. The results are freely available to the nuclear physicists' community so that other groups can perform their own nuclear structure calculations, even if they have only limited computational resources.

The idea outlined in this work is to describe the quantum mechanical states of nuclei in terms of relative coordinates, which makes it possible to describe the correlations between nucleons more easily. This approach also helps to separate out the motion of the centre of mass, thus further reducing the complexity of the problem. To date, most nuclear structure calculations have been performed using single particle basis states, as (in keeping with what is referred to as the Pauli exclusion principle) two identical elementary particles cannot occupy the same basis state--an aspect that is tremendously difficult to address in relative coordinates... Now, in the new work, the authors generate sets of basis states for nucleons in complex nuclei, which feature anti-symmetrical relative coordinates.

The authors introduce an algorithm designed to reflect the anti-symmetrized nature of the nucleon states using standard harmonic oscillator states for the light p-shell nuclei. The states are produced along with their corresponding recoupling coefficients, making it possible to include two- and three-nucleon operators. The study focuses on several p-shell nuclei and examines their dependence on the harmonic oscillator frequency. Subsequently, the authors extract the binding and excitation energies of these nuclei.
-end-
Reference: S. Liebig, U.-G. Meißner, and A. Nogga (2016), Jacobi no-core shell model for p-shell nuclei, European Physical Journal A 52: 103, DOI 10.1140/epja/i2016-16103-5

Springer

Related Nuclei Articles from Brightsurf:

The new heavy isotope mendelevium-244 and a puzzling short-lived fission activity
A team of scientists from GSI Helmholtzzentrum fuer Schwerionenforschung Darmstadt, University Mainz (JGU), Helmholtz Institute Mainz (HIM) and the University of Jyvaeskylae, Finland, has provided new insights into the fission processes in exotic nuclei and for this, has produced the hitherto unknown nucleus mendelevium-244.

Physicists study mirror nuclei for precision theory test
A precision measurement of helium and hydrogen mirror isotopes reveals new questions in understanding of nuclear structure.

Capturing the coordinated dance between electrons and nuclei in a light-excited molecule
Using SLAC's high-speed 'electron camera,' scientists simultaneously captured the movements of electrons and nuclei in a light-excited molecule.

X-ray imaging of atomic nuclei
Optically imaging atomic nuclei is a long-sought goal for scientific and applied research, but it has never been realized so far.

MSU professor collaborates with international colleagues in Review of Modern Physics journal article
MSU Professor Alexandra Gade collaborated with international colleagues for a Review of Modern Physics article about shell evolution of exotic nuclei.

New method described for quantifying antisense oligonucleotides in nuclei
A novel method uses subcellular fractionation to quantify label-free antisense oligonucleotides (AONs)- designed to silence targeted genes - that have crossed into the nucleus of a cell, where they can exert their effects.

Deuteron-like heavy dibaryons -- a step towards finding exotic nuclei
Using supercomputer, TIFR's physicists have predicted the existence of deuteron-like exotic nuclei for the first time as well as provided their masses precisely.

Nuclear architecture: What organizes the genome in the nucleus?
Spatial separation of active from inactive fractions of the genome in the cell nucleus is crucial for gene expression control.

'Fire streaks' ever more real in the collisions of atomic nuclei and protons
Collisions of lead nuclei take place under extreme physical conditions.

Nuclear 'magic numbers' collapse beyond the doubly magic nickel 78
Scientists have demonstrated that nickel 78, a neutron-rich 'doubly magic' isotope of nickel with 28 protons and 50 neutrons, still maintains a spherical shape that allows it to be relatively stable despite the large imbalance in the number of protons and neutrons.

Read More: Nuclei News and Nuclei Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.