Wed·Apr 29, 2020Wednesday·April 29, 2020

1. 01*

   Beauty Production with ALICE at the LHC

   Erin Gauger (on behalf of the ALICE Collaboration)🇺🇸

   In this manuscript, various beauty production measurements using the ALICE detector will be presented. We will show new measurements of non-prompt D${}^0$ mesons in pp collisions at $\sqrt{s}=5.02$ TeV and beauty-tagged jet production in p--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV. The $R_{\mathrm{AA}}$ of beauty-hadron decay electrons in central Pb--Pb collisions and the $v_2$ of beauty-hadron decay electrons in semi-central Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV will also be discussed.

   nucl-exhep-exSpringer Proc.Phys.(2020)·0 citations
2. 02*

   Status of the search for $\eta$-mesic nuclei with particular focus on $\eta$-Helium bound states

   Magdalena Skurzok🇵🇱

   In this paper the search for eta-mesic nuclei with particular focus on light $\eta$-He bound states is reviewed. A brief description of recent theoretical studies and experimental results is presented.

   nucl-exnucl-thFew Body Syst.(2021)·4 citations
3. 03*

   Evidence for the $N^{\prime }(1720)3/2^{+}$ Nucleon Resonance from Combined Studies of CLAS ${\pi }^{+}{\pi }^{-}p$ Photo- and Electroproduction Data

   V.I. Mokeev🇺🇸 · V.D. Burkert🇺🇸 · D.S. Carman🇺🇸 · L. Elouadrhiri🇺🇸 · E. Golovatch🇷🇺 · R.W. Gothe🇺🇸 · K. Hicks🇺🇸 · B.S. Ishkhanov🇷🇺 · E.L. Isupov🇷🇺 · K. Joo🇺🇸 · N. Markov🇺🇸 · E. Pasyuk🇺🇸 · A. Trivedi🇺🇸

   The analysis of the nine 1-fold differential cross sections for the ${\gamma }_{r,v}p\to {\pi }^{+}{\pi }^{-}p$ photo- and electroproduction reactions obtained with the CLAS detector at Jefferson Laboratory was carried out with the goal to establish the contributing resonances in the mass range from 1.6~GeV to 1.8~GeV. In order to describe the photo- and electroproduction data with $Q^2$-independent resonance masses and hadronic decay widths in the $Q^2$ range below 1.5~GeV${}^2$, it was found that an $N^{\prime }(1720)3/2^{+}$ state is required in addition to the already well-established nucleon resonances. This work demonstrates that the combined studies of ${\pi }^{+}{\pi }^{-}p$ photo- and electroproduction data are vital for the observation of this resonance. The contributions from the $N^{\prime }(1720)3/2^{+}$ state and the already established $N(1720)3/2^{+}$ state with a mass of 1.745~GeV are well separated by their different hadronic decays to the $\pi \Delta$ and $\rho p$ final states and the different $Q^2$-evolution of their photo-/electroexcitation amplitudes. The $N^{\prime }(1720)3/2^{+}$ state is the first recently established baryon resonance for which the results on the $Q^2$-evolution of the photo-/electrocouplings have become available. These results are important for the exploration of the nature of the ``missing'' baryon resonances.

   nucl-exhep-phPLB(2020)·44 citations
4. 04*

   Enhanced dynamics in fusion of neutron-rich oxygen nuclei at above-barrier energies

   S. Hudan🇺🇸 · R.T. deSouza🇺🇸 · A.S. Umar🇺🇸 · Z. Lin🇺🇸 · C.J. Horowitz🇺🇸

   Above-barrier fusion cross-sections for an isotopic chain of oxygen isotopes with A=16-19 incident on a ${}^{12}$C target are presented. Experimental data are compared with both static and dynamical microscopic calculations. These calculations are unable to explain the $\sim$37\% increase in the average above-barrier fusion cross-section observed for ${}^{19}$O as compared to $\beta$-stable oxygen isotopes. This result suggests that for neutron-rich nuclei existing time-dependent Hartree-Fock calculations underpredict the role of dynamics at near-barrier energies. High-quality measurement of above-barrier fusion for an isotopic chain of increasingly neutron-rich nuclei provides an effective means to probe this fusion dynamics.

   nucl-exnucl-thPRC(2020)·13 citations
5. 05*

   A facility for mass production of ultra-pure NaI powder for the COSINE-200 experiment

   Keonah Shin🇰🇷 · Junseok Choe🇰🇷 · Olga Gileva🇰🇷 · Alain Iltis🇫🇷 · Yeongduk Kim🇰🇷 · Cheolho Lee🇰🇷 · Hyun Su Lee🇰🇷 · Moo Hyun Lee🇰🇷 · Hyang Kyu Park🇰🇷

   COSINE-200 is the next phase of the ongoing COSINE-100 experiment. The main purpose of the experiment is the performance of an unambiguous verification of the annual modulation signals observed by the DAMA experiment. The success of the experiment critically depends on the production of a 200 kg array of ultra-pure NaI(Tl) crystal detectors that have lower backgrounds than the DAMA crystals. The purification of raw powder is the initial but important step toward the production of ultra-pure NaI(Tl) detectors. We have already demonstrated that fractional recrystallization from water solutions is an effective method for the removal of the problematic K and Pb elements. For the mass production of purified powder, a clean facility for the fractional recrystallization had been constructed at the Institute for Basic Science (IBS), Korea. Here, we report the design of the purification process, material recovery, and performance of the NaI powder purification facility.

   ↳ physics.ins-detastro-ph.IMhep-exnucl-exJINST(2020)·16 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.