English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The neutron-rich $^{28,29}$F isotopes have been recently studied via knockoutand interaction cross-section measurements. The $2n$ halo in $^{29}$F has beenlinked to the occupancy of $pf$ intruder configurations. We investigate boundand continuum states in $^{29}$F, focusing on the $E1$ response of low-lyingexcitations and the effect of dipole couplings on nuclear reactions.$^{29}\text{F}$ ($^{27}\text{F}+n+n$) wave functions are built within thehyperspherical harmonics formalism, and reaction cross sections are calculatedusing the Glauber theory. Continuum states and $B(E1)$ transition probabilitiesare described in a pseudostate approach using the analytical THO basis. Thecorresponding structure form factors are used in CDCC calculations to describelow-energy scattering. Parity inversion in $^{28}$F leads to a $^{29}$F groundstate characterized by 57.5% of $(p_{3/2})^2$ intruder components, a strongdineutron configuration, and an increase of the matter radius with respect tothe core radius of $\Delta R=0.20$ fm. Glauber-model calculations for a carbontarget at 240 MeV/nucleon provide a total reaction cross section of 1370 mb, inagreement with recent data. The model produces also a barely bound excitedstate corresponding to a quadrupole excitation. $B(E1)$ calculations into thecontinuum yield a total strength of 1.59 e$^2$fm$^2$ up to 6 MeV, and the $E1$distribution exhibits a resonance at $\approx$ 0.85 MeV. Results using astandard shell-model order for $^{28}$F lead to a considerable reduction of the$B(E1)$ distribution. The four-body CDCC calculations for$^{29}\text{F}+^{120}\text{Sn}$ around the Coulomb barrier are dominated bydipole couplings, which totally cancel the Fresnel peak in the elastic crosssection. These results are consistent with a two-neutron halo and may guidefuture experimental campaigns.

Electric dipole response of low-lying excitations in the two-neutron halo nucleus $\boldsymbol{^{29}}$F