Mon·Mar 28, 2022Monday·March 28, 2022

1. 01*

   On differences between even and odd anisotropic-flow harmonics in non-equilibrated systems

   Benedikt Bachmann🇩🇪 · Nicolas Borghini🇩🇪 · Nina Feld🇩🇪 · Hendrik Roch🇩🇪

   To assess how anisotropic transverse flow is created in a system out of equilibrium, we compare several kinetic-theoretical models in the few-rescatterings regime. We compare the flow harmonics $v_n$ from three types of transport simulations, with either $2\to 2$ or $2\to 0$ collision kernels and in the former case allowing the particles to rescatter several times or not, and from analytical calculations neglecting the gain term of the Boltzmann equation. We find that the even flow harmonics are similar in all approaches, while the odd ones differ significantly. This suggests that while even $v_n$ harmonics may to a large extent be due to the anisotropic escape probability of particles, this is not the predominant mechanism underlying the odd $v_n$ coefficients.

   ↳ nucl-thhep-phnucl-exEPJC(2023)·10 citations
2. 02*

   p-process chaser detector in $n$-$\gamma$ coincidences

   H. Utsunomiya (1 and 2)🇯🇵 · Z.R. Hao (1 and 3) · S. Goriely (4)🇧🇪 · X.G. Cao (1, 3, and 5)🇨🇳 · G.T. Fan (1, 3, and 5)🇨🇳 · H.W. Wang (1, 3, and 5) ((1) Shanghai Advanced Research Institute, (2) Konan University, (3) University of Chinese Academy of Sciences, (4) Universite Libre de Bruxelles, (5) Shanghai Institute of Applied Physics)

   We propose two types of neutron-${\gamma }_1$-${\gamma }_2$ triple coincidence detectors (not constructed) to chase gamma transitions to produce p-nuclei following the neutron emission in the $(\gamma ,n)$ reaction. Neutrons are detected with 24 ${}^3$He counters embedded in a polyethylene moderator in Type I detector and with 6 liquid scintillation detectors in Type II detector, respectively. $\gamma$ rays are detected with two high-purity germanium detectors and four LaBr${}_3$(Ce) detectors. The detector which is referred to as p-process chaser detector is used to search for mediating states in ${}^{180}$Ta through which the isomeric and ground states in ${}^{180}$Ta are thermalized in the p-process. A search is made for both resonant states and unresolved states in high nuclear-level-density domain.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2022)·0 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.