Mon·Nov 26, 2018Monday·November 26, 2018

1. 01*

   Application of isochronous mass spectrometry for the study of angular momentum population in projectile fragmentation reactions

   X. L. Tu🇨🇳 · A. Kelic-Heil🇩🇪 · Yu. A. Litvinov🇩🇪 · Zs. Podolyak🇬🇧 · Y. H. Zhang🇨🇳 · W. J. Huang🇨🇳 · H. S. Xu🇨🇳 · K. Blaum🇩🇪 · F. Bosch🇩🇪 · R. J. Chen🇨🇳 · X. C. Chen🇨🇳 · C. Y. Fu🇨🇳 and 28 other authors

   Isochronous mass spectrometry was applied to measure isomeric yield ratios of fragmentation reaction products. This approach is complementary to conventional gamma-ray spectroscopy in particular for measuring yield ratios for long-lived isomeric states. Isomeric yield ratios for the high-spin I = 19/2 states in the mirror nuclei 53Fe and 53Co are measured to study angular momentum population following the projectile fragmentation of 78Kr at energies of 480A MeV on a beryllium target. The 19/2 state isomeric ratios of 53Fe produced from different projectiles in the literature have also been extracted as a function of mass number difference between projectile and fragment (mass loss). The results are compared to ABRABLA07 model calculations. The isomeric ratios of 53Fe produced using different projectiles suggest that the theory underestimates not only the previously reported dependence on the spin but also the dependence on the mass loss.

   nucl-exPRC(2017)·10 citations
2. 02*

   The First Direct Search for Inelastic Boosted Dark Matter with COSINE-100

   C. Ha🇰🇷 · G. Adhikari🇰🇷 · P. Adhikari🇰🇷 · E. Barbosa de Souza🇺🇸 · N. Carlin🇧🇷 · S. Choi🇰🇷 · M. Djamal🇮🇩 · A. C. Ezeribe🇬🇧 · I. S. Hahn🇰🇷 · E. J. Jeon🇰🇷 · J. H. Jo🇺🇸 · H. W. Joo🇰🇷 and 36 other authors

   A search for inelastic boosted dark matter (iBDM) using the COSINE-100 detector with 59.5 days of data is presented. This relativistic dark matter is theorized to interact with the target material through inelastic scattering with electrons, creating a heavier state that subsequently produces standard model particles, such as an electron-positron pair. In this study, we search for this electron-positron pair in coincidence with the initially scattered electron as a signature for an iBDM interaction. No excess over the predicted background event rate is observed. Therefore, we present limits on iBDM interactions under various hypotheses, one of which allows us to explore an area of the experimental search for iBDM using a terrestrial detector.

   ↳ astro-ph.IMhep-exnucl-exphysics.ins-detPRL(2019)·42 citations
3. 03*

   Shell model results for nuclear ${\beta }^{-}$-decay properties of $sd$ shell nuclei

   Anil Kumar🇮🇳 · Praveen C. Srivastava🇮🇳 · Toshio Suzuki🇯🇵

   We evaluate the allowed ${\beta }^{-}$-decay properties of nuclei with $Z=8-15$ systematically under the framework of the nuclear shell model with the use of the valence space Hamiltonians derived from modern $abintio$ methods, such as in-medium similarity renormalization group and coupled-cluster theory. For comparison we also show results obtained with fitted interaction derived from the chiral effective field theory and phenomenological USDB interaction. We have performed calculations for O $\to$ F, F $\to$ Ne, Ne $\to$ Na, Na $\to$ Mg, Mg $\to$ Al, Al $\to$ Si, Si $\to$ P and P $\to$ S transitions. Theoretical results of $B(GT)$, log$ft$ values and half-lives, are discussed and compared with the available experimental data.

   ↳ nucl-thnucl-exPTEP(2020)·11 citations
4. 04*

   Optical Potential and Removal Energies in Lepton Nucleus Scattering

   Arie Bodek🇺🇸 · Tejin Cai🇺🇸

   We summarize some of the results presented in arXiv:1801.07975 [nucl-th]\cite{FSIpaper}(to be published in EPJC in 2018) on modeling electron and neutrino QE scattering on a variety of nuclei within the impulse approximation. We find that with three parameters we can describe the final state lepton energy for all of available electron QE data on Lithium, Carbon+Oxygen, Aluminum, Calcium+Argon, Iron and Lead+Gold. The first parameter, the removal energy ${ϵ}^{P,N}$ is extracted from exclusive ee${}^{\prime }$p spectral function data. The second parameter $V_{eff}$, which accounts for the interaction of final state leptons and protons with the Coulomb potential of the nucleus, is available from published comparisons of inclusive QE electron and positron cross section. We extract the third parameter $U_{FSI}({\vec{q}}_3^2)$, which accounts for the interaction of the final state nucleon with the optical potential of the spectator nucleus (FSI), by fitting all available inclusive QE cross sections on nuclear targets. Here $q_3$ is the three momentum transfer. With these three parameters we can model the energy of final state electrons and nucleons for all available electron QE scattering data. At present the uncertainty in the value of the removal energy parameters is a the largest source of systematic error in the extraction of the neutrino oscillation parameter $\Delta m^2$. The use of the updated parameters in neutrino Monte Carlo generators reduces the systematic uncertainty in the combined removal energy (with FSI corrections) from $\pm$ 20 MeV to $\pm$ 5 MeV. In this short contribution we only summarize the results for Carbon+Oxygen and Calcium+Argon

   ↳ hep-phhep-exnucl-exPoS(2018)·0 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.