Wed·Feb 24, 2016Wednesday·February 24, 2016

1. 01*

   Evolution of fusion hindrance for asymmetric systems at deep sub barrier energies

   A. Shrivastavaa🇮🇳 · K. Mahata🇮🇳 · S.K. Pandit🇮🇳 · V. Nanal🇮🇳 · T. Ichikawa🇯🇵 · K. Hagino🇯🇵 · A. Navin🇫🇷 · C.S. Palshetkar🇮🇳 · V.V. Parkar🇮🇳 · K. Ramachandran🇮🇳 · P.C. Rout🇮🇳 · Abhinav Kumar🇮🇳 · A. Chatterjee🇮🇳 · S. Kailas🇮🇳

   Measurements of fusion cross-sections of 7Li and 12C with 198Pt at deep sub-barrier energies are reported to unravel the role of the entrance channel in the occurrence of fusion hindrance. The onset of fusion hindrance has been clearly observed in 12C + 198Pt system but not in 7Li + 198Pt system, within the measured energy range. Emergence of the hindrance, moving from lighter (6,7Li) to heavier (12C,16O) projectiles is explained employing a model that considers a gradual transition from a sudden to adiabatic regime at low energies. The model calculation reveals a weak effect of the damping of coupling to collective motion for the present systems as compared to that obtained for systems with heavier projectiles.

   nucl-exnucl-thPLB(2016)·32 citations
2. 02*

   New data on cross-sections of deuteron induced nuclear reactions on gold up to 50 MeV and comparison of production routes of medically relevant Au and Hg radioisotopes

   F. Tárkányi · A. Hermanne · F. Ditrói · S. Takács · R. Adam-Rebeles

   Investigations of cross-sections of deuteron induced nuclear reactions on gold were extended up to 50 MeV by using the standard stacked foil irradiation technique and high resolution gamma-ray spectrometry. New cross-sections are reported for the ${}^{197}$Au(d,xn)${}^{197m,197g,195m,195g,193m,193g}$Hg and ${}^{197}$Au(d,x)${}^{198m,198g,196m,196g,195,194}$Au nuclear reactions. The application for production of the medically relevant isotopes ${}^{198}$Au and ${}^{195m,195g,197m,197g}$Hg is discussed, including the comparison with other charged particle induced production routes. The possible use of the ${}^{197}$Au(d,x)${}^{197m,197g,195m,193m}$Hg and ${}^{196m,196g}$Au reactions for monitoring deuteron beam parameters is also investigated.

   nucl-exNucl.Instrum.Meth.B(2015)·4 citations
3. 03*

   Measurement of D-meson production versus multiplicity in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

   ALICE Collaboration

   The measurement of prompt D-meson production as a function of multiplicity in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ALICE detector at the LHC is reported. D${}^0$, D${}^{+}$ and D${}^{\ast +}$ mesons are reconstructed via their hadronic decay channels in the centre-of-mass rapidity range $-0.96<y_{\mathrm{cms}}<0.04$ and transverse momentum interval $1<p_{\mathrm{T}}<24$ GeV/$c$. The multiplicity dependence of D-meson production is examined by either comparing yields in p-Pb collisions in different event classes, selected based on the multiplicity of produced particles or zero-degree energy, with those in pp collisions, scaled by the number of binary nucleon-nucleon collisions (nuclear modification factor); as well as by evaluating the per-event yields in p-Pb collisions in different multiplicity intervals normalised to the multiplicity-integrated ones (relative yields). The nuclear modification factors for D${}^0$, D${}^{+}$ and D${}^{\ast +}$ are consistent with one another. The D-meson nuclear modification factors as a function of the zero-degree energy are consistent with unity within uncertainties in the measured $p_{\mathrm{T}}$ regions and event classes. The relative D-meson yields, calculated in various $p_{\mathrm{T}}$ intervals, increase as a function of the charged-particle multiplicity. The results are compared with the equivalent pp measurements at $\sqrt{s}=7$ TeV as well as with EPOS~3 calculations.

   nucl-exhep-exJHEP(2016)·63 citations
4. 04*

   Understanding the nature of the heavy pentaquarks and searching for them in pion-induced reactions

   Xiao-Hai Liu🇯🇵 · Makoto Oka🇯🇵

   We investigate the reaction ${\pi }^{-}p\to {\pi }^{-}J/\psi p$ via the open-charm hadron rescattering diagrams. Due to the presence of the triangle singularity (TS) in the rescattering amplitudes, the TS peaks can simulate the pentaquark-like resonances arising in the $J/\psi p$ invariant mass distributions, which may bring ambiguities on our understanding of the nature of the exotic states. Searching for the heavy pentaquark in different processes may help us to clarify the ambiguities, because of the highly process-dependent characteristic of the TS mechanism.

   ↳ hep-phhep-exnucl-exnucl-thNPA(2016)·39 citations
5. 05*

   Cumulants of multiplicity distributions in most-central heavy-ion collisions

   Hao-jie Xu🇨🇳

   I investigate the volume corrections on cumulants of total charge distributions and net proton distributions. The required volume information is generated by an optical Glauber model. I find that the corrected statistical expectations of multiplicity distributions mimic the negative binomial distributions at non-central collisions, and they tend to approach the Poisson ones at most-central collisions due to the "boundary effects," which suppress the volume corrections. However, net proton distributions and reference multiplicity distributions are sensitive to the external volume fluctuations at most-central collisions, which imply that one has to consider the details of volume distributions in event-by-event multiplicity fluctuation studies.

   ↳ nucl-thhep-phnucl-exPRC(2016)·20 citations
6. 06*

   Direct extraction of nuclear effects in quasielastic scattering on carbon

   Callum Wilkinson🇨🇭 · Kevin S. McFarland🇺🇸

   Nuclear effects on neutrino reactions are expected to be a significant complication in current and future neutrino oscillation experiments seeking precision measurements of neutrino flavor transitions. Calculations of these nuclear effects are hampered by a lack of experimental data comparing neutrino reactions on free nucleons to neutrino reactions on nuclei. We present results from a novel technique that compares neutrino and antineutrino charged current quasielastic scattering on hydrocarbons to extract a cross section ratio of antineutrino charged current elastic reactions on free protons to charged current quasielastic reactions on the protons bound in a carbon nucleus. This measurement of nuclear effects is compared to models.

   ↳ hep-exhep-phnucl-exPRD(2016)·2 citations
7. 07*

   Preparation of Silver and Silver-backing self-supported thin targets by high vacuum evaporation

   P. Cabanelas🇪🇸 · D. Galaviz🇵🇹 · A. Henriques🇨🇭 · A. Sánchez-Benítez🇪🇸 · P. Teubig🇵🇹 · P. Velho🇵🇹

   We have produced in the Nuclear Physics Center in Lisbon thin film self-supported targets of Ag, LiF/Ag and CaF${}_2$/Ag by a high vacuum resistance evaporation method. The production setup, materials, methods, characterization and results are described.

   ↳ physics.ins-detnucl-ex0 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.