Tue·Mar 17, 2020Tuesday·March 17, 2020

1. 01*

   States of ${}^{12}$N with enhanced radii

   A.S. Demyanova · A.N. Danilov · A.A. Ogloblin · V.I. Starastsin · S.V. Dmitriev · W.H. Trzaska🇫🇮 · S.A. Goncharov · T.L. Belyaeva · V.A. Maslov · Yu.G. Sobolev🇨🇿 · Yu.E. Penionzhkevich🇷🇺 · S.V. Khlebnikov and 6 other authors

   The differential cross sections of the ${}^{12}$C(${}^3$He,t)${}^{12}$N reaction leading to formation of the 1${}^{+}$ (ground state), 2${}^{+}$(0.96 MeV), 2${}^{-}$(1.19 MeV), and 1${}^{-}$(1.80 MeV) states of ${}^{12}$N are measured at $E$(${}^3$He)=40 MeV. The analysis of the data is carried out within the modified diffraction model (MDM) and distorted wave Born approximation (DWBA). Enhanced $rms$ radii were obtained for the ground, 2${}^{-}$(1.19 MeV), and 1${}^{-}$(1.80 MeV) states. We revealed that ${}^{12}$B, ${}^{12}$N, and ${}^{12}$C in the IAS with T=1, and spin-parities 2${}^{-}$ and 1${}^{-}$ have increased radii and exhibit properties of neutron and proton halo states.

   nucl-exnucl-thPisma Zh.Eksp.Teor.Fiz.(2020)·6 citations
2. 02*

   Collision system size scan of collective flows in relativistic heavy-ion collisions

   S. Zhang🇨🇳 · Y. G. Ma🇨🇳 · G. L. Ma🇨🇳 · J. H. Chen🇨🇳 · Q. Y. Shou🇨🇳 · W. B. He🇨🇳 · C. Zhong🇨🇳

   Initial geometrical distribution and fluctuation can affect the collective expansion in relativistic heavy-ion collisions. This effect may be more evident in small system (such as B + B) than in large one (Pb + Pb). This work presents the collision system dependence of collective flows and discusses about effects on collective flows from initial fluctuations in a framework of a multiphase transport model. The results shed light on system scan on experimental efforts to small system physics.

   ↳ nucl-thhep-phnucl-exPLB(2020)·19 citations
3. 03*

   Determination of Photonuclear Reaction Cross-Sections on stable p-shell Nuclei by Using Deep Neural Networks

   Serkan Akkoyun · Hüseyin Kaya · Abdulkadir Şeker · Saliha Yeşilyurt

   The photonuclear reactions which is induced by high-energetic photon are one of the important type of reactions in the nuclear structure studies. In this reaction, a target material is bombarded by photons with the energies in the range of gamma-ray energy scale and the photons can statistically be absorbed by a nucleus in the target material. In order to get rid of the excess energies of the excited target nuclei, it can first emit protons, neutrons, alphas and light particles according to the separation energy thresholds. After this emitting process, generally an unstable nucleus can be formed. By the investigation of this products forming after photonuclear reactions, nuclear structure information can be obtained. In the present work, ({\gamma}, n) photonuclear reaction cross-sections on stable p-shell nuclei have been estimated by using neural network method. The main purpose of this study is to find neural network structures that give the best estimations on the cross-sections and to compare them with each other and available literature data. According to the results, the method is convenient for this task.

   ↳ nucl-thnucl-exphysics.data-an0 citations
4. 04*

   Experimental Study of Acceptor Removal in UFSD

   Y. Jin (a) · H. Ren (a) · S. Christie (a) · Z. Galloway (a) · C. Gee (a) · C. Labitan (a) · M. Lockerby (a) · F. Martinez-McKinney (a) · S. M. Mazza (a) · R. Padilla (a) · H. F.-W. Sadrozinski (a) · B. Schumm (a) and 18 other authors

   The performance of the Ultra-Fast Silicon Detectors (UFSD) after irradiation with neutrons and protons is compromised by the removal of acceptors in the thin layer below the junction responsible for the gain. This effect is tested both with C-V measurements of the doping concentration and with measurements of charge collection using charged particles. We find a perfect linear correlation between the bias voltage to deplete the gain layer determined with C-V and the bias voltage to collect a defined charge, measured with charge collection. An example for the usefulness of this correlation is presented.

   ↳ physics.ins-dethep-exnucl-exNucl.Instrum.Meth.A(2020)·9 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.