Mon·Dec 25, 2023Monday·December 25, 2023

1. 01*

   Photonuclear reaction in {67}^Zn

   Sylvian Kahane · Raymond Moreh

   Mono-energetic $\gamma$-beams ($\text{Delata}\approx$ 10 eV) based on thermal neutron capture, in a nuclear reactor, using the Mn(n, $\gamma$) reaction were utilized for generating a fast neutron source from Zinc, via the ${67}^{Z}n(\gamma ,n)$ reaction. One of the incident $\gamma$-lines of the Mn source at $E_{\gamma }$ = 7244 keV, photoexcites by chance a resonance level in {67}^Zn, with subsequent emission of neutrons at an energy of 191 keV. The cross-section for this process was measured and found to be $\sigma (\gamma ,n)$ = 252 $\pm$ 41 mb with an intensity of the order of 104 n/s. The angular distribution of the 191 keV neutron group was also measured.

   nucl-exIJMPE(2023)·0 citations
2. 02*

   Toward Initial Conditions of Conserved Charges

   Patrick Carzon🇺🇸

   At top collider energies where baryon stopping is negligible, the initial state of heavy ion collisions is overall charge neutral and predominantly composed of gluons. Nevertheless, there can also be significant local fluctuations of the baryon number, strangeness, and electric charge densities about zero, perturbatively corresponding to the production of quark/antiquark pairs. These previously ignored local charge fluctuations can permit the study of charge diffusion in the quark-gluon plasma (QGP), even at top collider energies. In this paper we present a new model denoted \code{iccing} (Initial Conserved Charges in Nuclear Geometry) which can reconstruct the initial conditions of conserved charges in the QGP by sampling a ($g\to q\bar{q}$) splitting probability over the initial energy density. We find that the new charge distributions generally differ from the bulk energy density; in particular, the strangeness distribution is significantly more eccentric than standard bulk observables and appears to be associated with the geometry of hot spots in the initial state. The new information provided by these conserved charges opens the door to studying a wealth of new charge- and flavor-dependent correlations in the initial state and ultimately the charge transport parameters of the QGP.

   ↳ nucl-thhep-phnucl-ex0 citations
3. 03*

   Interference of resonances in two-proton emission of ${}^{16}$Ne

   Tomohiro Oishi🇯🇵 · Masaaki Kimura🇯🇵

   We investigate the two-proton ($2p$) emission from ${}^{16}$Ne with the time-dependent ${}^{14}$O$+p+p$ three-body calculations. Two $0^{+}$ resonances are suggested to participate. For the $0_1^{+}$ resonance, the true emission of the spatially localized two protons is dominant, if the single-particle $s_{1/2}$ resonance locates above the $2p$ energy. By evaluating a time-evolution probability, the $0_2^{+}$ resonance is suggested at $\cong 3$ MeV from the $2p$ threshold. The inclusion of $0_2^{+}$ resonance makes the true-$2p$~emission more dominant in the time-dependent calculations.

   ↳ nucl-thnlin.CDnucl-exPRC(2025)·3 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.