Tue·Jun 26, 2018Tuesday·June 26, 2018

1. 01*

   Measuring the isotopic composition of trace elements in zircon: application to radiogenic molybdenum

   Adam J. Mayer🇩🇪 · Michael Wieser🇨🇦 · William Matthews · Robert Ian Thompson🇨🇦

   Techniques have been developed to measure the isotopic composition of trace elements from matrices predominantly consisting of interfering isotopes. These techniques have been applied to measuring mass-independent fractionation of molybdenum in ancient zircon samples due to nuclear decays. Improvements to the digestion of large zircon samples and the ion exchange chemistry required to separate trace molybdenum from zirconium silicate are presented. The efficacy of TEVA ion exchange resin as a replacement for anion resin to improve separation efficiency and chemistry blank was studied. An algorithm was established to improve background, interference and mass bias corrections for the data analysis of Mo by multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS). This enabled the isotopic composition measurement of $<$50 ng of Mo recovered from 500 mg ZrSiO${}_4$ by reducing the Zr content by $>$9 orders of magnitude while retaining 63% of the Mo. With 5 ng of Zr still remaining, novel data analysis techniques enabled $<$0.1 permil precision on each Mo isotope. The relevance of this technique to extracting other atomic species is also discussed.

   nucl-ex1 citation
2. 02*

   Pushing the limits of excited-state $g$-factor measurements

   Andrew E. Stuchbery🇦🇺 · Brendan P. McCormick🇦🇺 · Timothy J. Gray🇦🇺 · Ben J. Coombes🇦🇺

   Current developments in excited-state $g$-factor measurements are discussed with an emphasis on cases where the experimental methodology is being extended into new regimes. The transient-field technique, the recoil in vacuum method, and moment measurements with LaBr${}_3$ detectors are discussed.

   nucl-exEPJ Web Conf.(2018)·1 citation
3. 03*

   From Nuclei to the Cosmos: Tracing Heavy-Element Production with the Oldest Stars

   Anna Frebel (MIT)🇺🇸

   Understanding the origin of the elements has been a decades long pursuit, with many open questions still remaining. Old stars found in the Milky Way and its dwarf satellite galaxies can provide answers because they preserve clean elemental patterns of the nucleosynthesis processes that operated some 13 billion years ago. This enables the reconstruction of the chemical evolution of the elements. Here we focus on the astrophysical signatures of heavy neutron-capture elements made in the s-, i- and r-process found in old stars. A highlight is the recently discovered r-process galaxy Reticulum II that was apparently enriched by a neutron star merger. These results show that old stars in dwarf galaxies provide a novel means to constrain the astrophysical site of the r-process, ushering in much needed progress on this major outstanding question. This nuclear astrophysics work complements the many nuclear physics efforts into heavy-element formation, and aligns with recent results on the gravitational wave signature of a neutron star merger.

   ↳ astro-ph.SRnucl-exnucl-thAnn.Rev.Nucl.Part.Sci.(2018)·73 citations
4. 04*

   The $S_{E1}$ factor of radiative $\alpha$ capture on ${}^{12}$C in cluster effective field theory

   Shung-Ichi Ando (Sunmoon U.)🇰🇷

   The $S_{E1}$-factor of radiative $\alpha$-capture on ${}^{12}$C is studied in effective field theory up to next-to-leading order. A modification of the counting rules for the radiative capture amplitudes is discussed. We find that only two unfixed parameters remain in the amplitudes, and those two parameters are fitted to the experimental $S_{E1}$ data. An $S_{E1}$ factor is calculated at the Gamow-peak energy as $S_{E1}=59\pm 3$ keV$\cdot$b, and the result is found to be about 30% smaller than the estimates reported recently. An uncertainty of the estimate in the present work is also discussed.

   ↳ nucl-thnucl-exPRC(2019)·22 citations
5. 05*

   Survey and Test Environment for ITER EPP#12 Electrical Components

   Xiaoyang Sun🇨🇳 · Feng Wang🇨🇳 · Qingsheng Hu🇨🇳 · Changjun Xu🇨🇦 · Mengya Nie🇨🇳

   The purpose of Equatorial Port Plug 12 (EPP#12) for International thermonuclear experimental reactor (ITER) is to provide a common platform and interface, support or constrainer for five diagnostic plant systems and one glow discharging cleaning system (GDC). As EPP#12 integrator, a team from Institute of plasma physics Chinese of Sciences (CASIPP) performs the design work. The Instrument and Control(I&C) is an important part of system design. The main I&C functions will be implemented include temperature measurements of the port structures, electrical heater with temperature control during baking of windows and providing spare input measurement channel. The integrator should provide the embedded temperature sensors, associated cabling, electrical connectors and electrical feedthrough. Most electrical components will be deployed in port plug structure which is a harsh environment for electrical components. In this paper, we present the survey and research of electrical components for ITER EPP#12. And the design and implement of a test environment for electrical components which is based-on ITER CODAC is also described.

   ↳ physics.ins-detnucl-ex0 citations
6. 06*

   Discrepancy in low transverse momentum dileptons from relativistic heavy-ion collisions

   Taesoo Song🇩🇪 · Wolfgang Cassing🇩🇪 · Pierre Moreau🇩🇪 · Elena Bratkovskaya🇩🇪

   The dilepton transverse momentum spectra and invariant mass spectra for low $p_T<0.15$~GeV/c in Au+Au collisions of different centralities at $\sqrt{s_{NN}}$ = 200 GeV are studied within the parton-hadron-string dynamics (PHSD) transport approach. The PHSD describes the whole evolution of the system on a microscopic basis, incorporates hadronic and partonic degrees-of-freedom, the dynamical hadronization of partons and hadronic rescattering. For dilepton production in p+p, p+A and A+A reactions the PHSD incorporates the leading hadronic and partonic channels (also for heavy flavors) and includes in-medium effects such as a broadening of the vector meson spectral functions in hadronic matter and a modification of initial heavy-flavor correlations by interactions with the partonic and hadronic medium. The transport calculations reproduce well the momentum integrated invariant mass spectra from the STAR Collaboration for minimum bias Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV, while the description of the STAR data - when gating on low $p_T<0.15$ GeV/c - is getting worse when going from central to peripheral collisions. An analysis of the transverse momentum spectra shows that the data for peripheral (60-80\%) collisions are well reproduced for $p_T>0.2$ GeV/c while the strong peak at low $p_T<0.15$ GeV/c, that shows up in the experimental data for the mass bins ($0.4<M<0.7$ GeV and $1.2<M<2.6$ GeV), is fully missed by the PHSD and cannot be explained by the standard in-medium effects. This provides a new puzzle for microscopic descriptions of low $p_T$ dilepton data from the STAR Collaboration.

   ↳ nucl-thnucl-exPRC(2018)·9 citations
7. 07*

   Effective-field-theory predictions of the muon-deuteron capture rate

   Bijaya Acharya🇩🇪 · Andreas Ekström🇸🇪 · Lucas Platter🇺🇸

   We quantify the theoretical uncertainties of chiral effective-field-theory predictions of the muon-deuteron capture rate. Theoretical error estimates of this low-energy process is important for a reliable interpretation of forthcoming experimental results by the MuSun collaboration. Specifically, we estimate the three dominant sources of uncertainties that impact theoretical calculations of this rate: those resulting from uncertainties in the pool of fit data used to constrain the coupling constants in the nuclear interaction, those due to the truncation of the effective field theory, and those due to uncertainties in the axial radius of the nucleon. For the capture rate into the ${}^1{S}_0$ channel, we find an uncertainty of approximately $4.6s^{-1}$ due to the truncation in the effective field theory and an uncertainty of $3.9s^{-1}$ due to the uncertainty in the axial radius of the nucleon, both of which are similar in size to the targeted experimental precision.

   ↳ nucl-thnucl-exPRC(2018)·14 citations
8. 08*

   Data Acquisition Software for CBM-TOF super module quality control

   Jiawen Li🇨🇳 · Xiru Huang🇨🇳 · Ping Cao🇨🇳 · Chao Li · Jianhui Yuan🇺🇸 · Wei Jiang🇨🇳 · Junru Wang · Qi An🇨🇳

   The time-of-flight (TOF) system in the Compressed Baryonic Matter (CBM) experiment is composed of super modules based on multi-gap Resistive Plate Chambers (MRPC) for high-denseness, high-resolution time measurement. In order to evaluate the quality of detectors during the mass production, a distributed data readout system is developed to meet with the high data rate of 6.4Gbps, and a related data acquisition (DAQ) software is implemented under Linux operating system to test and verify the feasibility of the distributed data readout method. In this paper, the DAQ software is focused on data collection, event building, status monitoring and system controlling. Laboratory tests confirmed the function of the DAQ software and show that the overall data transfer rate of a single data transmission path can reach up to about 550Mbps which already meet the demand.

   ↳ physics.ins-detnucl-exIEEE Trans.Nucl.Sci.(2019)·3 citations
9. 09*

   Global superscaling analysis of quasielastic electron scattering with relativistic effective mass

   J.E. Amaro🇪🇸 · V.L. Martinez-Consentino🇪🇸 · E. Ruiz Arriola🇪🇸 · I. Ruiz Simo🇪🇸

   We present a global analysis of the inclusive quasielastic electron scattering data with a superscaling approach with relativistic effective mass. The SuSAM* model exploits the approximation of factorization of the scaling function $f^{\ast }({\psi }^{\ast })$ out of the cross section under quasifree conditions. Our approach is based on the relativistic mean field theory of nuclear matter where a relativistic effective mass for the nucleon encodes the dynamics of nucleons moving in presence of scalar and vector potentials. Both the scaling variable ${\psi }^{\ast }$ and the single nucleon cross sections include the effective mass as a parameter to be fitted to the data alongside the Fermi momentum $k_F$. Several methods to extract the scaling function and its uncertainty from the data are proposed and compared. The model predictions for the quasielastic cross section and the theoretical error bands are presented and discussed for nuclei along the periodic table from $A=2$ to $A=238$: ${}^2$H, ${}^3$H, ${}^3$He, ${}^4$He, ${}^{12}$C, ${}^6$Li, ${}^9$Be, ${}^{24}$Mg, ${}^{59}$Ni, ${}^{89}$Y, ${}^{119}$Sn, ${}^{181}$Ta, ${}^{186}$W, ${}^{197}$Au, ${}^{16}$O, ${}^{27}$Al, ${}^{40}$Ca, ${}^{48}$Ca, ${}^{56}$Fe, ${}^{208}$Pb, and ${}^{238}$U. We find that more than 9000 of the total $\sim 20000$ data fall within the quasielastic theoretical bands. Predictions for ${}^{48}$Ti and ${}^{40}$Ar are also provided for the kinematics of interest to neutrino experiments.

   ↳ nucl-thnucl-exPRC(2018)·23 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.