Thu·Jul 6, 2017Thursday·July 6, 2017

1. 01*

   Understand the thermometry of hot nuclei from the energy spectra of light charged particles

   E. Vient🇫🇷 · L. Augey🇫🇷 · B. Borderie🇫🇷 · A. Chbihi🇫🇷 · D. Dell'Aquila🇫🇷 · Q. Fable🇫🇷 · L. Francalanza🇮🇹 · J.D. Frankland🇫🇷 · E. Galichet🇫🇷 · D. Gruyer🇫🇷 · D. Guinet🇫🇷 · M. Henri🇫🇷 and 16 other authors

   In the domain of Fermi energy, the hot nucleus temperature can be determined by using the energy spectra of evaporated light charged particles. But this method of measurement is not without difficulties both theoretical and experimental. The presented study aims to disentangle the respective influences of different factors on the quality of this measurement : the physics, the detection (a 4? detector array as INDRA) and the experimental procedure. This analysis demonstrates the possibility of determining from an energy spectrum, with an accuracy of about 10 %, the true apparent temperature felt by a given type of particle emitted by a hot nucleus. Three conditions are however necessary : have a perfect detector of particles, an important statistics and very few secondary emissions. According to the GEMINI event generator, for hot nuclei of intermediate mass, only deuterons and tritons could fill these conditions. This temperature can allow to trace back to the initial temperature by using an appropriate method. This determination may be better than 15 %. With a real experimental device, an insufficient angular resolution and topological distortions caused by the detection can damage spectra to the point to make very difficult a correct determination of the apparent temperature. The experimental reconstruction of the frame of the hot nucleus may also be responsible for this deterioration

   nucl-exEPJA(2018)·5 citations
2. 02*

   Exotic tetraquark states with the $qq\bar{Q}\bar{Q}$ configuration

   Si-Qiang Luo🇨🇳 · Kan Chen🇨🇳 · Xiang Liu🇨🇳 · Yan-Rui Liu🇨🇳 · Shi-Lin Zhu🇨🇳

   In this work, we study systematically the mass splittings of the $qq\bar{Q}\bar{Q}$ ($q=u$, $d$, $s$ and $Q=c$, $b$) tetraquark states with the color-magnetic interaction by considering color mixing effects and estimate roughly their masses. We find that the color mixing effect is relatively important for the $J^P=0^{+}$ states and possible stable tetraquarks exist in the $nn\bar{Q}\bar{Q}$ ($n=u$, $d$) and $ns\bar{Q}\bar{Q}$ systems either with $J=0$ or with $J=1$. Possible decay patterns of the tetraquarks are briefly discussed.

   ↳ hep-phhep-exhep-latnucl-ex+1EPJC(2017)·152 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.