Mon·Mar 13, 2017Monday·March 13, 2017

1. 01*

   Light charged clusters emitted in 32 MeV/nucleon 136,124Xe+124,112Sn reactions: chemical equilibrium, 3He and 6He production

   R. Bougault🇫🇷 · E. Bonnet🇫🇷 · B. Borderie🇫🇷 · A. Chbihi🇫🇷 · D. Dell'Aquila🇫🇷 · Q. Fable🇫🇷 · L. Francalanza🇮🇹 · J.D. Frankland🇫🇷 · E. Galichet🇫🇷 · D. Gruyer🇮🇹 · D. Guinet🇫🇷 · M. Henri🇫🇷 and 12 other authors

   Nuclear particle production from peripheral to central events is presented. N/Z gradient between projectile and target is studied using the fact that two reactions have the same projectile+target N/Z and so the same neutron to proton ratio for the combined system. Inclusive data study in the forward part of the center of mass indicates that N/Z equilibration between the projectile-like and the target-like is achieved for central collisions. Particles are also produced from mid-rapidity region. 3He mean pre-equilibrium character is evidenced and 6He production at mid-rapidity implies a neutron enrichment phenomenon of the projectile target interacting zone.

   nucl-exPRC(2018)·27 citations
2. 02*

   Heavy-ion Physics at a Fixed-Target Experiment Using the LHC Proton and Lead Beams (AFTER@LHC): Feasibility Studies for Quarkonium and Drell-Yan Production

   B. Trzeciak🇳🇱 · C. Da Silva🇺🇸 · E.G. Ferreiro🇪🇸 · C. Hadjidakis🇫🇷 · D. Kikola🇵🇱 · J.P. Lansberg🇫🇷 · L. Massacrier🇫🇷 · J. Seixas🇵🇹 · A. Uras🇫🇷 · Z. Yang🇨🇳

   We outline the case for heavy-ion-physics studies using the multi-TeV lead LHC beams in the fixed-target mode. After a brief contextual reminder, we detail the possible contributions of AFTER@LHC to heavy-ion physics with a specific emphasis on quarkonia. We then present performance simulations for a selection of observables. These show that ${\rm Y}(nS)$, $J/\psi$ and $\psi (2S)$ production in heavy-ion collisions can be studied in new energy and rapidity domains with the LHCb and ALICE detectors. We also discuss the relevance to analyse the Drell-Yan pair production in asymmetric nucleus-nucleus collisions to study the factorisation of the nuclear modification of partonic densities and of further quarkonia to restore their status of golden probes of the quark-gluon plasma formation.

   nucl-exhep-exhep-phnucl-thFew Body Syst.(2017)·19 citations
3. 03*

   Applicability of the Wong formula for fusion cross sections from light to heavy systems

   N. W. Lwin · N. N. Htike · K. Hagino🇯🇵

   We discuss the applicability of the Wong formula for fusion cross sections in a single-channel problem. To this end, we carry out a systematic study and compare the approximate fusion cross sections with the exact results in a wide mass region of reaction systems. We show that the deviation of the approximate results from the exact cross sections is large for light systems, even though the Wong formula provides a reasonable approximation for heavy systems. We also discuss the energy dependence of the deviation, and show that for a given projectile nucleus the critical energy, at which the deviation exceeds 5\% of the exact cross sections, increases as a function of the mass number of the target nucleus.

   ↳ nucl-thnucl-exPRC(2017)·6 citations
4. 04*

   Multi-Grid Detector for Neutron Spectroscopy: Results Obtained on Time-of-Flight Spectrometer CNCS

   M. Anastasopoulos🇸🇪 · R. Bebb🇸🇪 · K. Berry🇺🇸 · J. Birch🇸🇪 · T. Bryś🇸🇪 · J.-C. Buffet🇫🇷 · J.-F. Clergeau🇫🇷 · P.P. Deen🇸🇪 · G. Ehlers🇺🇸 · P. van Esch🇫🇷 · S. M. Everett🇺🇸 · B. Guerard🇫🇷 and 14 other authors

   The Multi-Grid detector technology has evolved from the proof-of-principle and characterisation stages. Here we report on the performance of the Multi-Grid detector, the MG.CNCS prototype, which has been installed and tested at the Cold Neutron Chopper Spectrometer, CNCS at SNS. This has allowed a side-by-side comparison to the performance of ${}^3$He detectors on an operational instrument. The demonstrator has an active area of 0.2 m${}^2$. It is specifically tailored to the specifications of CNCS. The detector was installed in June 2016 and has operated since then, collecting neutron scattering data in parallel to the He-3 detectors of CNCS. In this paper, we present a comprehensive analysis of this data, in particular on instrument energy resolution, rate capability, background and relative efficiency. Stability, gamma-ray and fast neutron sensitivity have also been investigated. The effect of scattering in the detector components has been measured and provides input to comparison for Monte Carlo simulations. All data is presented in comparison to that measured by the ${}^3$He detectors simultaneously, showing that all features recorded by one detector are also recorded by the other. The energy resolution matches closely. We find that the Multi-Grid is able to match the data collected by ${}^3$He, and see an indication of a considerable advantage in the count rate capability. Based on these results, we are confident that the Multi-Grid detector will be capable of producing high quality scientific data on chopper spectrometers utilising the unprecedented neutron flux of the ESS.

   ↳ physics.ins-detnucl-exJINST(2017)·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.