Electromagnetic excitations and responses in nuclei from first principles

0499248 - ÚJF 2019 RIV US eng C - Conference Paper (international conference)
Baker, R. B. - Launey, K. D. - Dinur, N. N. - Bacca, S. - Draayer, J. P. - Dytrych, Tomáš
Electromagnetic excitations and responses in nuclei from first principles.
AIP Conference Proceedings. Vol. 2038. Melville: AIP Publishing, 2018, č. článku 020006. ISBN 978-0-73541-764-9. ISSN 0094-243X.
[4th International Workshop on State of the Art in Nuclear Cluster Physics (SOTANCP4). Texas (US), 13.05.2018-18.05.2018]
R&D Projects: GA ČR GA16-16772S
Institutional support: RVO:61389005
Keywords : ab initio symmetry * no-core shell model * nucleon-nucleon potentials
OECD category: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

We discuss the role of clustering on monopole, dipole, and quadrupole excitations in nuclei in the framework of the ab initio symmetry-adapted no-core shell model (SA-NCSM). The SA-NCSM starts from nucleon-nucleon potentials and, by exploring symmetries known to dominate the nuclear dynamics, can reach nuclei up through the calcium region by accommodating ultra-large model spaces critical to descriptions of clustering and collectivity. The results are based on calculations of electromagnetic sum rules and discretized responses using the Lanczos algorithm, that can be used to determine response functions, and for 4He are benchmarked against exact solutions of the hyperspherical harmonics method. In particular, we focus on He, Be, and O isotopes, including giant resonances and monopole sum rules.
Permanent Link: http://hdl.handle.net/11104/0291481