Thu·Jul 22, 2021Thursday·July 22, 2021

1. 01*

   Elastic and inelastic alpha transfer in the ${}^{16}$O+${}^{12}$C scattering

   Nguyen Tri Toan Phuc🇻🇳 · Nguyen Hoang Phuc🇻🇳 · Dao. T. Khoa🇻🇳

   The elastic scattering cross section measured at energies $E\lesssim 10$ MeV/nucleon for some light heavy-ion systems having two identical cores like ${}^{16}$O+${}^{12}$C exhibits an enhanced oscillatory pattern at the backward angles. Such a pattern is known to be due to the transfer of the valence nucleon or cluster between the two identical cores. In particular, the elastic $\alpha$ transfer has been shown to originate directly from the core-exchange symmetry in the elastic ${}^{16}$O+${}^{12}$C scattering. Given the strong transition strength of the $2_1^{+}$ state of ${}^{12}$C and its large overlap with the ${}^{16}$O ground state, it is natural to expect a similar $\alpha$ transfer process (or inelastic $\alpha$ transfer) to take place in the inelastic ${}^{16}$O+${}^{12}$C scattering. The present work provides a realistic coupled channel description of the $\alpha$ transfer in the inelastic ${}^{16}$O+${}^{12}$C scattering at low energies. Based on the results of the 4 coupled reaction-channels calculation, we show a significant contribution of the $\alpha$ transfer to the inelastic ${}^{16}$O+${}^{12}$C scattering cross section at the backward angles. These results suggest that the explicit coupling to the $\alpha$ transfer channels is crucial in the studies of the elastic and inelastic scattering of a nucleus-nucleus system with the core-exchange symmetry.

   ↳ nucl-thnucl-exCommun.in Phys.(2021)·2 citations
2. 02*

   Potential energy surfaces and fission fragment mass yields of even-even superheavy nuclei

   P. V. Kostryukov · A. Dobrowolski🇵🇱 · B. Nerlo-Pomorska🇵🇱 · M. Warda🇵🇱 · Z. G. Xiao🇨🇳 · Y. J. Chen🇨🇳 · L. L. Liu🇨🇳 · J. L. Tian🇨🇦 · K. Pomorski🇵🇱

   Potential energy surfaces and fission barriers of superheavy nuclei are analyzed in the macroscopic-microscopic model. The Lublin-Strasbourg Drop (LSD) is used to obtain the macroscopic part of the energy, whereas the shell and pairing energy corrections are evaluated using the Yukawa-folded potential. A standard flooding technique has been used to determine the barrier heights. It was shown the Fourier shape parametrization containing only three deformation parameters reproduces well the nuclear shapes of nuclei on their way to fission. In addition, the non-axial degree of freedom is taken into account to describe better the form of nuclei around the ground state and in the saddles region. Apart from the symmetric fission valley, a new very asymmetric fission mode is predicted in most superheavy nuclei. The fission fragment mass distributions of considered nuclei are obtained by solving the 3D Langevin equations.

   ↳ nucl-thnucl-exCPC(2021)·25 citations
3. 03*

   Nuclear ab initio calculations of 6He $\beta$-decay for beyond the Standard Model studies

   Ayala Glick-Magid🇮🇱 · Christian Forssén🇸🇪 · Daniel Gazda🇨🇿 · Doron Gazit🇮🇱 · Peter Gysbers🇨🇦 · Petr Navrátil🇨🇦

   Precision measurements of $\beta$-decay observables offer the possibility to search for deviations from the Standard Model. A possible discovery of such deviations requires accompanying first-principles calculations. Here we compute the nuclear structure corrections for the $\beta$-decay of ${}^6$He which is of central interest in several experimental efforts. We employ the impulse approximation together with wave functions calculated using the ab initio no-core shell model with potentials based on chiral effective field theory. We use these state-of-the-art calculations to give a novel and comprehensive analysis of theoretical uncertainties. We find that nuclear corrections, which we compute within the sensitivity of future experiments, create significant deviation from the naive Gamow-Teller predictions, making their accurate assessment essential in searches for physics beyond the Standard Model.

   ↳ nucl-thnucl-exPLB(2022)·41 citations
4. 04*

   A method to remove lower order contributions in multi-particle femtoscopic correlation functions

   Raffaele Del Grande🇩🇪 · Laura Šerkšnytė🇩🇪 · Laura Fabbietti🇩🇪 · Valentina Mantovani Sarti🇩🇪 · Dimitar Mihaylov🇩🇪

   In recent years the femtoscopy technique has been used by the ALICE Collaboration in small colliding systems at the LHC to investigate the strong-interaction of hadron pairs in the low-energy regime. The extension of this technique to the study of many-body correlations aims to deliver in the next years the first experimental measurements of the genuine many-hadron interactions, provided that the contributions due to the lower order terms are properly accounted for. In this paper we present a method that allows to determine the residual lower order contributions to the three-body correlation functions, based on the cumulant decomposition approach and on kinematic transformations. A procedure to simulate genuine three-body correlations in three-baryon correlation functions is also developed. A qualitative study of the produced correlation signal is performed by varying the strength of the adopted three-body interaction model and comparisons with the expectations for the lower order contributions to the correlation function are shown. The method can be also applied to evaluate the combinatorial background in the two-body correlation functions, providing an improved statistical accuracy with respect to the standard techniques. The example of the contribution by the pK${}^{+}$K${}^{-}$ channel to the recently measured p$\varphi$ correlation is discussed.

   ↳ nucl-thhep-exhep-phnucl-exEPJC(2022)·23 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.