The spectroscopy of F19 is of interest for nuclear astrophysics and nuclear structure. In astrophysics, fluorine and the reactions producing and destroying it play a key role in constraining models of stars in different evolutionary stages, such as the asymptotic giant branch (AGB) stars, responsible of the production of about half of the elements heavier than Fe. In nuclear structure, F19 has been subject to many investigations aiming at the identification of α and more exotic cluster structures. Also, its spectroscopy is very useful to constrain the nuclear properties of the Ne19 mirror nucleus. In this work, we report on the measurement of the N15-α elastic scattering using the thick target inverse kinematics approach, allowing us to span a very large fluorine excitation energy range (∼6-10 MeV). The use of N15-α scattering proves very useful to study α clustering in F19 thanks to the likelihood for populating states with such a structure. Indeed, the R-matrix analysis of the measured differential cross sections shows the occurrence of many candidate α-cluster states of F19. It also calls for the redefinition of the spin-parity and widths of a number of F19 states with respect to what reported in the literature.

Observation of N 15 +α resonant structures in F 19 using the thick target in inverse kinematics scattering method

La Cognata, M.;Figuera, P.;Cherubini, S.;Lamia, L.;Lattuada, D.;Lattuada, M.;Rapisarda, G. G.;Romano, S.;Spartá, R.;Spitaleri, C.;Torresi, D.;
2019

Abstract

The spectroscopy of F19 is of interest for nuclear astrophysics and nuclear structure. In astrophysics, fluorine and the reactions producing and destroying it play a key role in constraining models of stars in different evolutionary stages, such as the asymptotic giant branch (AGB) stars, responsible of the production of about half of the elements heavier than Fe. In nuclear structure, F19 has been subject to many investigations aiming at the identification of α and more exotic cluster structures. Also, its spectroscopy is very useful to constrain the nuclear properties of the Ne19 mirror nucleus. In this work, we report on the measurement of the N15-α elastic scattering using the thick target inverse kinematics approach, allowing us to span a very large fluorine excitation energy range (∼6-10 MeV). The use of N15-α scattering proves very useful to study α clustering in F19 thanks to the likelihood for populating states with such a structure. Indeed, the R-matrix analysis of the measured differential cross sections shows the occurrence of many candidate α-cluster states of F19. It also calls for the redefinition of the spin-parity and widths of a number of F19 states with respect to what reported in the literature.
Nuclear and High Energy Physics
File in questo prodotto:
File Dimensione Formato  
PhysRevC.99.034301-observation.pdf

accesso aperto

Tipologia: Versione Editoriale (PDF)
Dimensione 1.17 MB
Formato Adobe PDF
1.17 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11769/363274
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 9
  • ???jsp.display-item.citation.isi??? 8
social impact