First direct measurement of Cu-59(p, alpha) Ni-56: A step towards constraining the Ni-Cu cycle in the cosmos

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21670%2F21%3A00355402" target="_blank" >RIV/68407700:21670/21:00355402 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevC.104.L042801" target="_blank" >https://doi.org/10.1103/PhysRevC.104.L042801</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevC.104.L042801" target="_blank" >10.1103/PhysRevC.104.L042801</a>

Jazyk výsledku

angličtina

Název v původním jazyce

First direct measurement of Cu-59(p, alpha) Ni-56: A step towards constraining the Ni-Cu cycle in the cosmos

Popis výsledku v původním jazyce

Reactions on proton-rich nuclides drive the nucleosynthesis in core collapse supernovae (CCSNe) and in x-ray bursts (XRBs). CCSNe eject the nucleosynthesis products to the interstellar medium and hence are a potential inventory of p nuclei, whereas in XRBs nucleosynthesis powers the light curves. In both astrophysical sites the Ni-Cu cycle, which features a competition between Cu-59(p, alpha) Ni-56 and Cu-59(p, gamma) Zn-60, could potentially halt the production of heavier elements. Here, we report the first direct measurement of Cu-59(p, alpha) Ni-56 using a reaccelerated Cu-59 beam and a cryogenic solid hydrogen target. Our results show that the reaction proceeds predominantly to the ground state of Ni-56, and the experimental rate has been found to be lower than Hauser Feshbach based statistical model predictions. New results hints that the vp process could operate at higher temperatures than previously inferred and therefore remains a viable site for synthesizing the heavier elements.

Název v anglickém jazyce

First direct measurement of Cu-59(p, alpha) Ni-56: A step towards constraining the Ni-Cu cycle in the cosmos

Popis výsledku anglicky

Reactions on proton-rich nuclides drive the nucleosynthesis in core collapse supernovae (CCSNe) and in x-ray bursts (XRBs). CCSNe eject the nucleosynthesis products to the interstellar medium and hence are a potential inventory of p nuclei, whereas in XRBs nucleosynthesis powers the light curves. In both astrophysical sites the Ni-Cu cycle, which features a competition between Cu-59(p, alpha) Ni-56 and Cu-59(p, gamma) Zn-60, could potentially halt the production of heavier elements. Here, we report the first direct measurement of Cu-59(p, alpha) Ni-56 using a reaccelerated Cu-59 beam and a cryogenic solid hydrogen target. Our results show that the reaction proceeds predominantly to the ground state of Ni-56, and the experimental rate has been found to be lower than Hauser Feshbach based statistical model predictions. New results hints that the vp process could operate at higher temperatures than previously inferred and therefore remains a viable site for synthesizing the heavier elements.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

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

2469-9993

Svazek periodika

104

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

6

Strana od-do

1-6

Kód UT WoS článku

000715384000003

EID výsledku v databázi Scopus

2-s2.0-85118371120