Resonant states in H-7: Experimental studies of the H-2(He-8, He-3) reaction

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F21%3AA0000142" target="_blank" >RIV/47813059:19630/21:A0000142 - isvavai.cz</a>

Výsledek na webu

<a href="https://journals.aps.org/prc/abstract/10.1103/PhysRevC.103.044313" target="_blank" >https://journals.aps.org/prc/abstract/10.1103/PhysRevC.103.044313</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevC.103.044313" target="_blank" >10.1103/PhysRevC.103.044313</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Resonant states in H-7: Experimental studies of the H-2(He-8, He-3) reaction

Popis výsledku v původním jazyce

The extremely neutron-rich system H-7 was studied in the direct H-2(He-8, He-3) H-7 transfer reaction with a 26 A MeV secondary He-8 beam [Bezbakh et al., Phys. Rev. Lett. 124, 022502 (2020)]. The missing mass spectrum and center-of-mass angular distributions of H-7, as well as the momentum distribution of the H-3 fragment in the H-7 frame, were constructed. In addition, we carried out another experiment with the same beam but a modified setup, which was cross-checked by the study of the H-2(Be-10, He-3) Li-9 reaction. A solid experimental evidence is provided that two resonant states of H-7 are located in its spectrum at 2.2(5) and 5.5(3) MeV relative to the H-3 +4n decay threshold. Also, there are indications that the resonant states at 7.5(3) and 11.0(3) MeV are present in the measured H-7 spectrum. Based on the energy and angular distributions, obtained for the studied H-2(He-8, He-3) H-7 reaction, the weakly populated 2.2(5)-MeV peak is ascribed to the H-7 ground state. It is highly plausible that the firmly ascertained 5.5(3)-MeV state is the 5/2(+) member of the H-7 excitation 5/2(+)-3/2(+) doublet, built on the 2(+) configuration of valence neutrons. The supposed 7.5-MeV state can be another member of this doublet, which could not be resolved in Bezbakh et al. [Phys. Rev. Lett. 124, 022502 (2020)]. Consequently, the two doublet members appeared in the spectrum of H-7 in the work mentioned above as a single broad 6.5-MeV peak.

Název v anglickém jazyce

Resonant states in H-7: Experimental studies of the H-2(He-8, He-3) reaction

Popis výsledku anglicky

The extremely neutron-rich system H-7 was studied in the direct H-2(He-8, He-3) H-7 transfer reaction with a 26 A MeV secondary He-8 beam [Bezbakh et al., Phys. Rev. Lett. 124, 022502 (2020)]. The missing mass spectrum and center-of-mass angular distributions of H-7, as well as the momentum distribution of the H-3 fragment in the H-7 frame, were constructed. In addition, we carried out another experiment with the same beam but a modified setup, which was cross-checked by the study of the H-2(Be-10, He-3) Li-9 reaction. A solid experimental evidence is provided that two resonant states of H-7 are located in its spectrum at 2.2(5) and 5.5(3) MeV relative to the H-3 +4n decay threshold. Also, there are indications that the resonant states at 7.5(3) and 11.0(3) MeV are present in the measured H-7 spectrum. Based on the energy and angular distributions, obtained for the studied H-2(He-8, He-3) H-7 reaction, the weakly populated 2.2(5)-MeV peak is ascribed to the H-7 ground state. It is highly plausible that the firmly ascertained 5.5(3)-MeV state is the 5/2(+) member of the H-7 excitation 5/2(+)-3/2(+) doublet, built on the 2(+) configuration of valence neutrons. The supposed 7.5-MeV state can be another member of this doublet, which could not be resolved in Bezbakh et al. [Phys. Rev. Lett. 124, 022502 (2020)]. Consequently, the two doublet members appeared in the spectrum of H-7 in the work mentioned above as a single broad 6.5-MeV peak.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

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

103

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

„044313-1“-„044313-15“

Kód UT WoS článku

000647601300001

EID výsledku v databázi Scopus

2-s2.0-85104793019