Thu·Jul 28, 2016Thursday·July 28, 2016

1. 01*

   Unstable nuclei in dissociation of light stable and radioactive nuclei in nuclear track emulsion

   D. A. Artemenkov🇷🇺 · A. A. Zaitsev🇷🇺 · P. I. Zarubin🇷🇺

   A role of the unstable nuclei ${}^6$Be, ${}^8$Be and ${}^9$B in the dissociation of relativistic nuclei ${}^{7,9}$Be, ${}^{10}$B and ${}^{10,11}$C is under study on the basis of nuclear track emulsion exposed to secondary beams of the JINR Nuclotron. Contribution of the configuration ${}^6$Be + $\text{mit}n$ to the ${}^7$Be nucleus structure is 8 $\pm$ 1% which is near the value for the configuration ${}^6$Li + $\text{mit}p$. Distributions over the opening angle of $\alpha$-particle pairs indicate to a simultaneous presence of virtual ${}^8$Be${}_{g.s.}$ and ${}^8$Be${}_{2^{+}}$ states in the ground states of the ${}^9$Be and ${}^{10}$C nuclei. The core ${}^9$B is manifested in the {${}^{10}$C} nucleus with a probability of 30 $\pm$ 4%. Selection of the ${}^{10}$C "white" stars accompanied by ${}^8$Be${}_{g.s.}$ (${}^9$B) leads to appearance in the excitation energy distribution of 2$\alpha$2$\text{mit}p$ "quartets" of the distinct peak with a maximum at 4.1 $\pm$ 0.3 MeV. ${}^8$Be${}_{g.s.}$ decays are presented in 24 $\pm$ 7% of 2He + 2H events of the ${}^{11}$C coherent dissociation and 27 $\pm$ 11% of the 3He ones. The channel ${}^9$B + H amounts 14 $\pm$ 3%. The ${}^8$Be${}_{g.s.}$ nucleus is manifested in the coherent dissociation ${}^{10}$B $\to$ 2He + H with a probability of 25 $\pm$ 5% including 14 $\pm$ 3% of ${}^9$B decays. A probability ratio of the mirror channels ${}^9$B + $\text{mit}n$ and ${}^9$Be + $\text{mit}p$ is estimated to be 6 $\pm$ 1.

   nucl-exPhys.Part.Nucl.(2017)·14 citations
2. 02*

   Cold and Hot Nuclear Matter Effects on Charmonium Production in p+Pb Collisions at LHC Energy

   Baoyi Chen🇨🇳 · Tiecheng Guo🇨🇳 · Yunpeng Liu🇺🇸 · Pengfei Zhuang🇨🇳

   We study cold and hot nuclear matter effects on charmonium production in p+Pb collisions at $\sqrt{s_{\text{NN}}}=5.02$ TeV in a transport approach. At the forward rapidity, the cold medium effect on all the $c\bar{c}$ states and the hot medium effect on the excited $c\bar{c}$ states only can explain well the $J/\psi$ and ${\psi }^{\prime }$ yield and transverse momentum distribution measured by the ALICE collaboration, and we predict a significantly larger ${\psi }^{\prime }$ $p_{\text{T}}$ broadening in comparison with $J/\psi$. However, we can not reproduce the $J/\psi$ and ${\psi }^{\prime }$ data at the backward rapidity with reasonable cold and hot medium effects.

   ↳ nucl-thnucl-exPLB(2017)·44 citations
3. 03*

   Nuclear Physics Meets the Sources of the Ultra-High Energy Cosmic Rays

   Denise Boncioli🇩🇪 · Anatoli Fedynitch🇩🇪 · Walter Winter🇩🇪

   The determination of the injection composition of cosmic ray nuclei within astrophysical sources requires sufficiently accurate descriptions of the source physics and the propagation - apart from controlling astrophysical uncertainties. We therefore study the implications of nuclear data and models for cosmic ray astrophysics, which involves the photo-disintegration of nuclei up to iron in astrophysical environments. We demonstrate that the impact of nuclear model uncertainties is potentially larger in environments with non-thermal radiation fields than in the cosmic microwave background. We also study the impact of nuclear models on the nuclear cascade in a gamma-ray burst radiation field, simulated at a level of complexity comparable to the most precise cosmic ray propagation code. We conclude with an isotope chart describing which information is in principle necessary to describe nuclear interactions in cosmic ray sources and propagation.

   ↳ astro-ph.HEhep-phnucl-exnucl-thSci.Rep.(2017)·55 citations
4. 04*

   Semi-automatic charge and mass identification in two-dimensional matrices

   D. Gruyer (INFN, Sezione di Firenze, GANIL)🇮🇹 · E. Bonnet (GANIL)🇫🇷 · A. Chbihi (GANIL)🇫🇷 · J.D. Frankland (GANIL)🇫🇷 · S. Barlini (INFN, Sezione di Firenze)🇮🇹 · B. Borderie (IPNO)🇫🇷 · R. Bougault (LPCC)🇫🇷 · J. A. Duenas🇪🇸 · N. Le Neindre (LPCC)🇫🇷 · O. Lopez (LPCC)🇫🇷 · G. Pastore (INFN, Sezione di Firenze)🇮🇹 · S. Piantelli (INFN, Sezione di Firenze)🇮🇹 and 6 other authors

   This article presents a new semi-automatic method for charge and mass identification in two-dimensional matrices. The proposed algorithm is based on the matrix's properties and uses as little information as possible on the global form of the identification lines, making it applicable to a large variety of matrices, including Particular attention has been paid to the implementation in a suitable graphical environment, so that only two mouse-clicks are required from the user to calculate all initialization parameters. Example applications to recent data from both INDRA and FAZIA telescopes are presented.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2017)·8 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.