Thu·Aug 24, 2023Thursday·August 24, 2023

1. 01*

   Deciphering ${\Xi }^{-}$ capture events in light emulsion nuclei

   Eliahu Friedman🇮🇱 · Avraham Gal🇮🇱

   We recently showed that all five KEK and J-PARC uniquely assigned two-body ${\Xi }^{-}$+${}^A$Z$\to {}_{\Lambda }^{A^{\prime }}$Z'+${}_{\Lambda }^{A^{\prime \prime }}$Z'' capture events in CNO light emulsion nuclei are consistent with Coulomb-assisted $1p_{{\Xi }^{-}}$ nuclear states in a $\Xi$-nuclear potential of nuclear-matter depth $V_{\Xi }\gtrsim 20$ MeV [1]. Here we argue that the recently reported ${}^{14}$N capture events named KINKA and IRRAWADDY are more likely $1p_{{\Xi }^0}$--${}^{14}$C nuclear states [2] than $1s_{{\Xi }^{-}}$--${}^{14}$N states, the latter assignment implying considerably smaller values of $V_{\Xi }$.

   ↳ nucl-thhep-phnucl-exEPJ Web Conf.(2024)·2 citations
2. 02*

   A Micromegas-based gaseous detector for neutron-induced charged-particle reaction studies in nuclear astrophysics

   Chandrabhan Yadav · Akiva Green🇬🇧 · Moshe Friedman🇺🇸

   The quasistellar neutron spectrum produced via ${}^7$Li($p$, $n$)${}^7$Be reaction at a proton energy of 1.912 MeV has been extensively studied and employed reaction for neutron-induced reaction studies. We are working towards using this reaction at various proton energies from 1.9 MeV to 3.6 MeV to produce a neutron field at a temperature range of $\sim$1.5-3.5 GK to conduct measurements of neutron-induced charge particle reaction cross sections on various unstable nuclei at explosive stellar temperatures. In this paper, we are reporting our design and simulation study with regards to experimental set-up and a gaseous detector with a segmented Micromegas detector for conducting neutron-induced charge particle reactions studies for nuclei of astrophysics importance, for example, ${}^{26}$Al($n$, $p$)${}^{26}$Mg, ${}^{26}$Al($n$, $\alpha$)${}^{23}$Na and ${}^{40}$K($n$, $p$)${}^{40}$Ar, ${}^{40}$K($n$, $\alpha$)${}^{37}$Cl reactions. We plan to perform our experiments with a 10-$\mu$A proton beam at the Physikalisch Technische Bundesanstalt facility (PTB, Germany), with a Micromegas-based gaseous detector under construction as discussed in the paper.

   ↳ physics.ins-detnucl-exJINST(2024)·0 citations
3. 03*

   Toward experimental determination of spin entanglement of nucleon pairs

   Dong Bai🇨🇳

   Nuclear entanglement is a flagship in the interdisciplinary direction of nuclear physics and quantum information science. Spin entanglement, a special kind of nuclear entanglement, is ubiquitous in nuclear structures and dynamics. Based on the idea of quantum state tomography, the problem of experimental determination of spin entanglement of two-nucleon pure states is studied directly within the scope of nuclear physics. It is shown that the amount of spin entanglement can be obtained by measuring three spin polarizations of one nucleon in polarization experiments. The errors from imperfect preparation of nucleon pairs are also analyzed. This work not only complements the existing literature of nuclear entanglement but also provides new opportunities for nuclear physics with polarized particles.

   ↳ nucl-thnucl-exPRC(2024)·27 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.