Clustering and alpha-capture reaction rate from ab initio symmetry-adapted descriptions of Ne-20

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F20%3A00534265" target="_blank" >RIV/61389005:_____/20:00534265 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevC.102.044608" target="_blank" >https://doi.org/10.1103/PhysRevC.102.044608</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevC.102.044608" target="_blank" >10.1103/PhysRevC.102.044608</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Clustering and alpha-capture reaction rate from ab initio symmetry-adapted descriptions of Ne-20

Popis výsledku v původním jazyce

We introduce a new framework for studying clustering and for calculating alpha partial widths using ab initio wave functions. We demonstrate the formalism for Ne-20, by calculating the overlap between the O-16 + alpha cluster configuration and states in Ne-20 computed in the ab initio symmetry-adapted no-core shell model. We present spectroscopic amplitudes and spectroscopic factors, and compare those to no-core symplectic shell-model results in larger model spaces, to gain insight into the underlying physics that drives alpha clustering. Specifically, we report on the alpha partial width of the lowest 1- resonance in Ne-20, which is found to be in good agreement with experiment. We also present first no-core shell-model estimates for asymptotic normalization coefficients for the ground state, as well as for the first excited 4(+) state in Ne-20 that lies in a close proximity to the alpha + O-16 threshold. This outcome highlights the importance of correlations for developing cluster structures and for describing alpha widths. The widths can then be used to calculate alpha-capture reaction rates for narrow resonances of interest to astrophysics. We explore the reaction rate for the alpha-capture reaction O-16(alpha, gamma)Ne-20 at astrophysically relevant temperatures and determine its impact on simulated x-ray burst abundances.

Název v anglickém jazyce

Clustering and alpha-capture reaction rate from ab initio symmetry-adapted descriptions of Ne-20

Popis výsledku anglicky

We introduce a new framework for studying clustering and for calculating alpha partial widths using ab initio wave functions. We demonstrate the formalism for Ne-20, by calculating the overlap between the O-16 + alpha cluster configuration and states in Ne-20 computed in the ab initio symmetry-adapted no-core shell model. We present spectroscopic amplitudes and spectroscopic factors, and compare those to no-core symplectic shell-model results in larger model spaces, to gain insight into the underlying physics that drives alpha clustering. Specifically, we report on the alpha partial width of the lowest 1- resonance in Ne-20, which is found to be in good agreement with experiment. We also present first no-core shell-model estimates for asymptotic normalization coefficients for the ground state, as well as for the first excited 4(+) state in Ne-20 that lies in a close proximity to the alpha + O-16 threshold. This outcome highlights the importance of correlations for developing cluster structures and for describing alpha widths. The widths can then be used to calculate alpha-capture reaction rates for narrow resonances of interest to astrophysics. We explore the reaction rate for the alpha-capture reaction O-16(alpha, gamma)Ne-20 at astrophysically relevant temperatures and determine its impact on simulated x-ray burst abundances.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

<a href="/cs/project/GA16-16772S" target="_blank" >GA16-16772S: Vývoj symetriemi-řízených metod pro modelování středně těžkých atomových jader z prvních principů</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Physical Review C

ISSN

2469-9985

e-ISSN

—

Svazek periodika

102

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

14

Strana od-do

044608

Kód UT WoS článku

000579097700008

EID výsledku v databázi Scopus

2-s2.0-85094161979