arXiv subjects

M. Moeini Arani

Publications and source records attributed to M. Moeini Arani.

5 recordsLinked to original sources

arXiv2025

Radiative Capture Reaction $d(α,γ)^{6}\mathrm{Li} $ in Cluster Effective Field Theory

In this study, we focus on the radiative capture process of the deuteron on alpha particle leading to the formation of $^6{\textrm{Li}}$ in the two-body formalism through the cluster effective field theory~(CEFT). It was the primitive nuclear reaction to produce ${^6 \textrm{Li}}$ in a few minutes after the Big Bang. In detail, we outline the calculation of the dominant $E1$ and $E2$ electromagnetic transition amplitudes of $d(α,γ){^6\textrm{Li}}$. Then, we obtain the astrophysical S-factor by fitting it to the experimental data. Finally, we compare the obtained CEFT results for the astrophysical S-factor with the other theoretical results.

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arXiv2021

Halo EFT calculation of charge form factor for two-neutron ${}^{6}\textrm{He}$ halo nucleus: two-body resonant P-wave interaction

We take a new look at $^{6}\textrm{He}$ halo nucleus and set up a halo effective field theory at low energies to calculate the charge form factor of ${}^{6}\textrm{He}$ system with resonant P-wave interaction. P-wave Lagrangian has been introduced and the charge form factor of ${}^{6}\textrm{He}$ halo nucleus has been obtained at Leading-Order. In this study, the mean-square charge radius of ${}^{6}\textrm{He}$ nucleus relative to ${}^{4}\textrm{He}$ core and the root-mean-square (r.m.s) charge radius of ${}^{6}\textrm{He}$ nucleus have been estimated as $\langle r_{E}^{2}\rangle=1.408\; \textrm{fm}^{2}$ and $\langle r_{E}^{2}\rangle_{{}^{6}He}^{\frac{1}{2}}=2.058 \;\textrm{fm}$, respectively. We have compared our results with the other available theoretical and experimental data.

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arXiv2014

New insight into $nd\rightarrow$ $^3Hγ$ process at thermal energy with pionless effective field theory

We take a new look at the neutron radiative capture by a deuteron at thermal energy with the pionless effective field theory (EFT($π\!\!\!/$)) approach. We present in detail the calculation of $nd\rightarrow$ $^3Hγ$ amplitudes for incoming doublet and quartet channels leading to the formation of a triton fully in the projection method based on the cluster-configuration space approach. In the present work, we consider all possible one-body and two-body photon interaction diagrams. In fact, additional diagrams that make significant changes in the results of the calculation of the total cross section in the $nd\rightarrow$ $^3Hγ$ process are included in this study. The properly normalized triton wave function is calculated and taken into consideration. We compare the cross section of the dominant magnetic M1-transition of $nd\rightarrow$ $^3Hγ$ up to next-to-next-to-leading order $\textrm{N}^2\textrm{LO}$ with the results of the previous model-dependent theoretical calculations and experimental data. The more acceptable results for cross section $σ^{(2)}_{tot}=0.297\;(\textrm{LO})+0.124\;(\textrm{NLO})+0.048\;(\textrm{N}^2\textrm{LO})=[0.469\pm0.033]\:\textrm{mb}$ show order by order convergence and cutoff independence. No three-body currents are needed to renormalize observables up to $\textrm{N}^2\textrm{LO}$ in this process.

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arXiv2014

Photon asymmetries in $nd\rightarrow$ $^3Hγ$ using EFT($π/!/!/!/$) approach

The parity-violating Lagrangian of the weak nucleon-nucleon ($NN$) interaction in the pionless effective field theory (EFT($//!/!/!/pi$)) approach contains five independent unknown low-energy coupling constants (LECs). The photon asymmetry with respect to neutron polarization in $np\rightarrow$ $dγ$ $A^{np}_γ$, the circular polarization of outgoing photon in $np\rightarrow$ $dγ$ $P^{np}_γ$, the neutron spin rotation in hydrogen $\frac{1}ρ\frac{dϕ^{np}}{dl}$, the neutron spin rotation in deuterium $\frac{1}ρ\frac{dϕ^{nd}}{dl}$ and the circular polarization of $γ$-emission in $nd\rightarrow$ $^3Hγ$ $P^{nd}_γ$ are the parity-violating observables which have been recently calculated in terms of parity-violating LECs in the EFT($//!/!/!/pi$) framework. We obtain the LECs by matching the parity-violating observables to the Desplanques, Donoghue, and Holstein (DDH) best value estimates. Then, we evaluate photon asymmetry with respect to the neutron polarization $a^{nd}_γ$ and the photon asymmetry in relation to deuteron polarization $A^{nd}_γ$ in $nd\rightarrow$ $^3Hγ$ process. We finally compare our EFT($//!/!/!/pi$) photon asymmetries results with the experimental values and the previous calculations based on the DDH model.

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arXiv2013

Parity-violating photon circular polarization in $nd\rightarrow$ $^3Hγ$ with effective field theory at thermal energy

We study the parity-violating effects in $nd\rightarrow$ $^3Hγ$ process using pionless effective field theory (EFT($//!/!/!/pi$)) at thermal energy. For the weak $NN$ interaction the parity-violating Lagrangian contains five independent low-energy coupling constants (LECs). One can fix the coupling constants by comparison of the calculated observables with a sufficient number of experimental data. So, we need five observables to obtain LECs. One of the five parity-violating observables is the photon circular polarization ($P_γ$) in $nd\rightarrow$ $^3Hγ$ process. We calculate $P_γ$ at the leading order in terms of LECs. We compare our results with the previous $P_γ$ calculation based on the model of Desplanques, Donoghue, and Holstein.

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