Fri·Oct 8, 2021Friday·October 8, 2021

1. 01*

   Recent results and future prospects of kaonic nuclei at J-PARC

   F.Sakuma🇯🇵 · S.Ajimura🇯🇵 · T.Akaishi🇯🇵 · H.Asano🇯🇵 · M.Bazzi🇮🇹 · G.Beer🇨🇦 · H.Bhang🇰🇷 · M.Bragadireanu🇷🇴 · P.Buehler🇦🇹 · L.Busso🇮🇹 · M.Cargnelli🇦🇹 · S.Choi🇰🇷 and 64 other authors

   $\bar{K}$-nuclear bound systems, kaonic nuclei, have been widely discussed as products of the strongly attractive $\bar{K}N$ interaction in $I=0$ channels. Recently, we demonstrated that kaonic nuclei can be produced via in-flight $(K^{-},N)$ reactions using the low-momentum DC kaon beam at the J-PARC E15 experiment. We observed the simplest kaonic nuclei, $K^{-}pp$, having a much deeper binding energy than normal nuclei. For further studies, we have proposed a series of experimental programs for the systematic investigation of light kaonic nuclei, from $\bar{K}N$ ($\Lambda (1405)$) to $\bar{K}NNNN$. In the new experiment approved as J-PARC E80, we will measure the $\bar{K}NNN$ ($A=3$) system as a first step toward a comprehensive study.

   nucl-exnucl-thFew Body Syst.(2021)·3 citations
2. 02*

   Investigation of the ground-state spin inversion in the neutron-rich 47,49Cl isotopes

   B.D. Linh🇻🇳 · A. Corsi🇫🇷 · A. Gillibert🇫🇷 · A. Obertelli🇫🇷 · P. Doornenbal🇯🇵 · C. Barbieri🇮🇹 · S. Chen🇨🇳 · L.X. Chung🇻🇳 · T. Duguet🇫🇷 · M. Gómez-Ramos🇪🇸 · J.D. Holt🇨🇦 · A. Moro🇪🇸 and 74 other authors

   A first gamma-ray study of 47,49Cl spectroscopy was performed at the Radioactive Isotope Beam Factory with 50Ar projectiles at 217 MeV/nucleon, impinging on the liquid hydrogen target of the MINOS device. Prompt de-excitation gamma-rays were measured with the NaI(Tl) array DALI2+. Through the one-proton knockout reaction 50Ar(p,2p), a spin assignment could be determined for the low-lying states of 49Cl from the momentum distribution obtained with the SAMURAI spectrometer. A spin-parity J = 3/2+ is deduced for the ground state of 49Cl, similar to the recently studied N = 32 isotope 51K.

   nucl-exnucl-thPRC(2021)·14 citations
3. 03*

   Photoproduction of relativistic QED bound states in hadronic collisions

   R. Francener🇧🇷 · V. P. Goncalves🇧🇷 · B. D. Moreira🇧🇷

   In this paper we investigate the photoproduction of QED bound states in proton -- proton, proton -- nucleus and nucleus -- nucleus collisions at RHIC, LHC and FCC energies considering an accurate treatment of the absorptive corrections and for the nuclear form factor. The total cross sections for the production of singlet and triplet $(l^{+}{l}^{-})$ states, with $l=e,\mu ,\tau$, are estimated and a detailed analysis of the photoproduction of singlet QED bound states is performed considering the rapidity ranges covered by central and forward detectors. The impact of the Coulomb corrections on the parapositronium production in heavy ion collisions is estimated. We predict a large number of events associated to the production of ($e^{+}{e}^{-}$) and (${\mu }^{+}{\mu }^{-}$) states in hadronic collisions.

   ↳ hep-phhep-exnucl-exnucl-thEPJA(2022)·16 citations
4. 04*

   Study of nonlocality effects in direct capture reactions with Lagrange-mesh $R$-matrix method

   Nguyen Hoang Phuc🇻🇳 · Nguyen Tri Toan Phuc🇻🇳 · Do Cong Cuong

   We apply the Lagrange-mesh $R$-matrix method to calculate the $S$-factor for the ${}^{13}$C$(p,\gamma {)}^{14}$N and ${}^{16}$O$(p,\gamma {)}^{17}$F direct radiative capture reactions. By comparing the astrophysical $S$-factors calculated with nonlocal and local potentials, we investigate the nonlocality effects coming from the nuclear potentials in the direct capture reactions. Our calculations are in good agreement with the experimental data and indicate a nonnegligible difference in the results of local and nonlocal potentials. The use of small diffuseness narrow potentials also provides a remarkably good fit in the case with multiple broad resonances. Our findings suggest that the nonlocal potential improves the calculated results although the difference between the local and nonlocal potentials is smaller than uncertainties from other sources. We propose the nonlocality potential should be used in the potential model calculation of future astrophysics rates evaluation.

   ↳ nucl-thnucl-exIJMPE(2021)·4 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.