arXiv subjects

Phan Nhut Huan

Publications and source records attributed to Phan Nhut Huan.

3 recordsLinked to original sources

arXiv2026

Constraining neutron skin impurity in $^{48}\mathrm{Ca}$ and its relevance for the CREX-PREX puzzle

The impact of Coulomb core polarization on the neutron density distribution of $^{48}\mathrm{Ca}$ is investigated. The Coulomb boundary radius is located before the neutron skin region, leading to proton admixture and establishing neutron skin impurity as an intrinsic feature of the density profile. Using the $(^3\mathrm{He},t)$ isobaric analog state (IAS) reaction at 420 MeV, the impurity-induced modification of the probed neutron distribution is quantified. For a neutron skin of 0.144 fm, consistent with the CREX thin-skin scenario, Coulomb core polarization enhances the probed neutron distribution by approximately 0.052 fm. This value is remarkably close to the difference between the CREX and RCNP neutron skin determinations, providing a physical mechanism to reconcile the discrepancy between electroweak and hadronic probes in $^{48}\mathrm{Ca}$. These findings provide new insights into the CREX-PREX puzzle, highlight the importance of accounting for Coulomb core polarization in neutron distribution analyses, and motivate future IAS charge-exchange measurements as a complementary hadronic probe.

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arXiv2024

Neutron skin impurity from Coulomb core polarization in $^{208}\text{Pb}$: Insights from PREX-II and validation via the $(^{3}\text{He}, t)$ isobaric analog state reaction

I investigate the effect of Coulomb core-polarization in $^{208}\text{Pb}$, highlighting its impact on uncertainties in neutron distribution measurements due to the discrepancy between neutron excess and neutron skin regions at the surface. This effect is validated using the $(^{3}\text{He}, t)$ isobaric analog state (IAS) reaction at 420 MeV. My findings reveal that the Coulomb boundary radius, where core-polarization becomes negligible, is critical for accurately probing the neutron skin region in the target nucleus. Consequently, I propose extending the $^{208}\text{Pb}(^{3}\text{He}, t)$IAS reaction experiment conducted by Zegers et al. [Phys. Rev. Lett. 99, 202501 (2007)] to measure cross sections up to 3$^\circ$ angles to more precisely determine the neutron skin thickness in $^{208}\text{Pb}$ from theoretical reaction analysis. Additionally, I observe that, under the assumption of a large neutron skin in $^{208}\text{Pb}$, as suggested by the PREX-II result, the core-polarization effect introduces impurity into the neutron skin region.

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arXiv2021

Study of ($p,n$)IAS and ($^3$He,$t$)IAS charge-exchange reactions with the $G$-matrix folding method

Differential cross sections of ($p,n$) and ($^3$He,$t$) charge-exchange reactions leading to the excitation of the isobaric analog state (IAS) of the target nucleus are calculated with the distorted wave Born approximation. The $G$-matrix double-folding method is employed to determine the nucleus-nucleus optical potential within the framework of the Lane model. $G$-matrices are obtained from a Brueckner-Hartree-Fock calculation using the Argonne Av18 nucleon-nucleon potential. Target densities have been taken from Skyrme-Hartree-Fock calculations which predict values for the neutron skin thickness of heavy nuclei compatible with current existing data. Calculations are compared with experimental data of the reactions ($p,n$)IAS on $^{14}$C at $E_{lab}=135$ MeV and $^{48}$Ca at $E_{lab}=134$ MeV and $E_{lab}=160$ MeV, and ($^3$He,$t$)IAS on $^{58}$Ni, $^{90}$Zr and $^{208}$Pb at $E_{lab}=420$ MeV. Experimental results are well described without the necessity of any rescaling of the strength of the optical potential. A clear improvement in the description of the differential cross sections for the ($^3$He,$t$)IAS reactions on $^{58}$Ni and $^{90}$Zr targets is found when the neutron excess density is used to determine the transition densities. Our results show that the density and isospin dependences of the $G$-matrices play a non-negligible role in the description of the experimental data.

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