Počet záznamů: 1
Clustering and alpha-capture reaction rates from first-principle structure calculations for nucleosynthesis
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SYSNO ASEP 0499251 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název Clustering and alpha-capture reaction rates from first-principle structure calculations for nucleosynthesis Tvůrce(i) Dreyfuss, A. C. (US)
Launey, K. D. (US)
Escher, J. E. (US)
Baker, R. B. (US)
Draayer, J. P. (US)
Dytrych, Tomáš (UJF-V) ORCID, SAICelkový počet autorů 6 Číslo článku 020013 Zdroj.dok. AIP Conference Proceedings, Proceedings of the 4th International Workshop on State of the Art in Nuclear Cluster Physics (SOTANCP4), 2038. - Melville : AIP Publishing, 2018 - ISSN 0094-243X - ISBN 978-0-73541-764-9 Poč.str. 6 s. Forma vydání Tištěná - P Akce 4th International Workshop on State of the Art in Nuclear Cluster Physics (SOTANCP4) Datum konání 13.05.2018 - 18.05.2018 Místo konání Texas Země US - Spojené státy americké Typ akce WRD Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova alpa-clustering ; calculations ; sympletic symmetry Vědní obor RIV BE - Teoretická fyzika Obor OECD Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect) CEP GA16-16772S GA ČR - Grantová agentura ČR Institucionální podpora UJF-V - RVO:61389005 UT WOS 000468354600012 EID SCOPUS 85057283927 DOI 10.1063/1.5078832 Anotace We outline a new formalism that begins with first-principles structure calculations to describe alpha-clustering, and ultimately leads to a description of alpha-capture reaction rates and impacts on abundance patterns from x-ray burst (XRB) nucle-osynthesis. We utilize a symmetry-adapted basis, which allows us to extend traditional ab initio calculations into the larger model spaces needed for the development of collectivity and clustering in nuclei. In particular, the use of symplectic symmetry allows us to describe spatially expansive states in nuclei - including the Hoyle state of 12C, its 2+ excitation, and B(E2) transitions - with only one or a few basis configurations. For narrow resonances, coupling to the continuum is weak and the number of competing channels is greatly reduced, so most of the physics of the system is described through the overlap of a wave function for the complete A-particle system, computed with a single symplectic configuration (consisting of several hundreds of basis states), and a cluster basis for a single cluster partitioning. This proves to be a very powerful tool for estimating spectroscopic amplitudes, decay widths, and nuclear reaction rates, with the ability to push toward nuclear reactions involving exotic nuclei that cannot currently be measured. We show preliminary results for the 16O(α, γ)20Ne reaction rate, and consider the implications for abundance patterns determined from XRB nucleosynthesis simulations. Pracoviště Ústav jaderné fyziky Kontakt Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Rok sběru 2019
Počet záznamů: 1