Mon·Oct 17, 2016Monday·October 17, 2016

1. 01*

   Activation cross sections of proton induced nuclear reactions on gold up to 65 MeV

   F. Ditrói · F. Tárkányi · S. Takács · A. Hermanne

   Activation cross sections of proton induced reactions on gold for production of ${}^{197m,197g,195m,195g,193m,193g,192}$Hg, ${}^{196m,196g(cum),195g(cum),194,191(cum)}$Au, ${}^{191(cum)}$Pt and ${}^{192}$Ir were measured up to 65 MeV proton energy, some of them for the first time. The new data are in acceptably good agreement with the recently published earlier experimental data in the overlapping energy region. The experimental data are compared with the predictions of the TALYS 1.6 (results in TENDL-2015 on-line library) and EMPIRE 3.2 code.

   nucl-exAppl.Radiat.Isot.(2016)·0 citations
2. 02*

   $\eta$ bound state: theory and experiment

   Hartmut Machner🇩🇪

   The search for a quasi bound $\eta$ meson in atomic nuclei is reviewed. This tentative state is studied theoretically as well as experimentally.

   nucl-exhep-phnucl-thEPJ Web Conf.(2017)·1 citation
3. 03*

   CUORE-0 background analysis and evaluation of ${}^{130}$Te $2\nu \beta \beta$ decay half-life

   Davide Chiesa (for the CUORE collaboration)🇮🇹

   CUORE is a bolometric experiment that will search for the Neutrinoless Double Beta decay of ${}^{130}$Te. CUORE-0 is a single CUORE-like tower that was run between 2013 and 2015 to test the performance of the CUORE experiment. In this proceeding we present the results of the model developed to disentangle and quantify the background sources that combine to form the CUORE-0 energy spectrum. We use detailed Geant4-based simulations and a Bayesian fitting algorithm to reconstruct the experimental data and evaluate the activities of the background sources. A direct outcome of this analysis is the measurement of the ${}^{130}$Te $2\nu \beta \beta$ decay half-life, of which we provide a preliminary evaluation.

   nucl-exphysics.ins-det0 citations
4. 04*

   The HPS electromagnetic calorimeter

   Ilaria Balossino · Nathan Baltzell · Marco Battaglieri · Mariangela Bondi · Emma Buchanan · Daniela Calvo · Andrea Celentano · Gabriel Charles · Luca Colaneri · Annalisa D'Angelo · Marzio De Napoli · Raffaella De Vita and 27 other authors

   The Heavy Photon Search experiment (HPS) is searching for a new gauge boson, the so-called "heavy photon." Through its kinetic mixing with the Standard Model photon, this particle could decay into an electron-positron pair. It would then be detectable as a narrow peak in the invariant mass spectrum of such pairs, or, depending on its lifetime, by a decay downstream of the production target. The HPS experiment is installed in Hall-B of Jefferson Lab. This article presents the design and performance of one of the two detectors of the experiment, the electromagnetic calorimeter, during the runs performed in 2015-2016. The calorimeter's main purpose is to provide a fast trigger and reduce the copious background from electromagnetic processes through matching with a tracking detector. The detector is a homogeneous calorimeter, made of 442 lead-tungstate (PbWO4) scintillating crystals, each read out by an avalanche photodiode coupled to a custom trans-impedance amplifier.

   ↳ physics.ins-dethep-exnucl-exNucl.Instrum.Meth.A(2017)·19 citations
5. 05*

   Production Uncertainties of p-Nuclei in the $\gamma$-Process in Massive Stars Using a Monte Carlo Approach

   T. Rauscher🇬🇧 · N. Nishimura🇬🇧 · R. Hirschi · G. Cescutti · A. St.J. Murphy🇬🇧 · A. Heger🇦🇺

   Proton-rich nuclei, the so-called p-nuclei, are made in photodisintegration processes in outer shells of massive stars in the course of the final supernova explosion. Nuclear uncertainties in the production of these nuclei have been quantified in a Monte Carlo procedure. Bespoke temperature-dependent uncertainties were assigned to different types of reactions involving nuclei from Fe to Bi and all rates were varied randomly within the uncertainties. The resulting total production uncertainties of the p-nuclei are below a factor of two, with few exceptions. Key reactions dominating the final uncertainties have been identified in an automated procedure using correlations between rate and abundance uncertainties. Our results are compared to those of a previous study manually varying reaction rates.

   ↳ astro-ph.HEastro-ph.SRnucl-exnucl-thJPS Conf.Proc.(2017)·0 citations
6. 06*

   Role of core excitation in (d,p) transfer reactions

   A. Deltuva🇱🇹 · A. Ross🇺🇸 · E. Norvaišas · F. M. Nunes🇺🇸

   [Background:] Recent work found that core excitation can be important in extracting structure information from (d,p) reactions. [Purpose:] Our objective is to systematically explore the role of core excitation in (d,p) reactions, and understand the origin of the dynamical effects. [Method:] Based on the particle-rotor model of $n{+}^{10}$Be, we generate a number of models with a range of separation energies ($S_n=0.1-5.0$ MeV), while maintaining a significant core excited component. We then apply the latest extension of the momentum-space based Faddeev method, including dynamical core excitation in the reaction mechanism to all orders, to the ${}^{10}$Be(d,p)${}^{11}$Be like reactions, and study the excitation effects for beam energies from $E_d=15-90$ MeV. [Results:] We study the resulting angular distributions and the differences between the spectroscopic factor that would be extracted from the cross sections, when including dynamical core excitation in the reaction, to that of the original structure model. We also explore how different partial waves affect the final cross section. [Conclusions:] Our results show a strong beam energy dependence of the extracted spectroscopic factors that become smaller for intermediate beam energies. This dependence increases for loosely bound systems.

   ↳ nucl-thnucl-exPRC(2016)·22 citations
7. 07*

   Heavy-Quark QCD Exotica

   Richard F. Lebed🇺🇸 · Ryan E. Mitchell🇺🇸 · Eric S. Swanson🇺🇸

   This review presents an overview of the remarkable progress in the field of heavy-quark exotic hadrons over the past 15 years. It seeks to be pedagogical rather than exhaustive, summarizing both the progress and specific results of experimental discoveries, and the variety of theoretical approaches designed to explain these new states.

   ↳ hep-phhep-exnucl-exnucl-thPPNP(2017)·847 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.