Clustering and alpha-capture reaction rates from first-principle structure calculations for nucleosynthesis

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F18%3A00499251" target="_blank" >RIV/61389005:_____/18:00499251 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1063/1.5078832" target="_blank" >http://dx.doi.org/10.1063/1.5078832</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.5078832" target="_blank" >10.1063/1.5078832</a>

Result language

angličtina

Original language name

Clustering and alpha-capture reaction rates from first-principle structure calculations for nucleosynthesis

Original language description

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.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Project

<a href="/en/project/GA16-16772S" target="_blank" >GA16-16772S: Development of symmetry-guided methods for first principle modeling of medium-mass atomic nuclei</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

AIP Conference Proceedings

ISBN

978-0-73541-764-9

ISSN

0094-243X

e-ISSN

—

Number of pages

6

Pages from-to

020013

Publisher name

AIP Publishing

Place of publication

Melville

Event location

Texas

Event date

May 13, 2018

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000468354600012