scholarly journals Testing ab initio nuclear structure in neutron-rich nuclei: Lifetime measurements of second 2+ state in C16 and O20

2020 ◽  
Vol 101 (2) ◽  
Author(s):  
M. Ciemała ◽  
S. Ziliani ◽  
F. C. L. Crespi ◽  
S. Leoni ◽  
B. Fornal ◽  
...  
Keyword(s):  
Ab Initio ◽  
Nuclear Structure ◽  
Lifetime Measurements

AB INITIO NUCLEAR STRUCTURE AND NUCLEAR REACTIONS IN LIGHT NUCLEI

2005 ◽  
Vol 14 (01) ◽  
pp. 85-93 ◽  
Author(s):  
PETR NAVRÁTIL
Keyword(s):  
Ab Initio ◽  
Shell Model ◽  
Nuclear Reaction ◽  
Nuclear Structure ◽  
Nuclear Reactions ◽  
Light Nuclei ◽  
Core Shell ◽  
Ab Initio Methods ◽  
Significant Progress ◽  
Nucleon Interactions

There has been significant progress in the ab initio approaches to the structure of light nuclei. One such method is the ab initio no-core shell model (NCSM). Starting from the realistic two- and three-nucleon interactions, this method can predict the low-lying levels in p-shell nuclei. It is a challenging task to extend the ab initio methods to describe nuclear reactions. In this contribution, we present a brief overview of the NCSM with examples of recent applications as well as the first steps taken toward nuclear reaction applications.

scholarly journals Accelerating many-nucleon basis generation for high performance computing enabled ab initio nuclear structure studies

2019 ◽  
Vol 33 (3) ◽  
pp. 522-533 ◽  
Author(s):  
Daniel Langr ◽  
Tomáš Dytrych ◽  
Kristina D Launey ◽  
Jerry P Draayer
Keyword(s):  
Ab Initio ◽  
Nuclear Structure ◽  
High Performance ◽  
Model Framework ◽  
Significant Acceleration ◽  
Model Spaces ◽  
Basis Construction ◽  
Nuclear Structure Calculations ◽  
Performance Computing ◽  
Structure Calculations

We present the problem of generating a many-nucleon basis in [Formula: see text]-scheme for ab initio nuclear structure calculations in a symmetry-adapted no-core shell model framework. We first discuss and analyze the basis construction algorithm whose baseline implementation quickly becomes a significant bottleneck for large model spaces and heavier nuclei. The outcomes of this analysis are utilized to propose a new scalable version of the algorithm. Its performance is consequently studied empirically using the Blue Waters supercomputer. The measurements show significant acceleration achieved with over two orders of magnitude speedups realized for larger model spaces.

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