Wed·Mar 22, 2017Wednesday·March 22, 2017

1. 01*

   Solar neutrino interactions with the double beta decay nuclei of ${}^{82}$Se, ${}^{100}$Mo and ${}^{150}$Nd

   H. Ejiri🇯🇵 · S.R. Elliott🇺🇸

   Solar neutrinos interact within double-beta decay (\BB) detectors and contribute to backgrounds for \BB\ experiments. Background contributions due to solar neutrino interactions with \BB\ nuclei of ${}^{82}$Se, ${}^{100}$Mo, and ${}^{150}$Nd are evaluated. They are shown to be significant for future high-sensitivity \BB\ experiments that may search for Majorana neutrino masses in the inverted-hierarchy mass region. The impact of solar neutrino backgrounds and their reduction are discussed for future \BB\ experiments.

   nucl-exPRC(2017)·20 citations
2. 02*

   Exclusive $\eta$ electroproduction at $W>2$ GeV with CLAS and transversity generalized parton distributions

   CLAS Collaboration: I. Bedlinskiy🇷🇺 · V. Kubarovsky🇺🇸 · P. Stoler🇺🇸 · K. P. Adhikari🇺🇸 · Z. Akbar🇺🇸 · S. Anefalos Pereira🇮🇹 · H. Avakian🇺🇸 · J. Ball🇫🇷 · N. A. Baltzell🇺🇸 · M. Battaglieri🇮🇹 · V. Batourine🇺🇸 · A. S. Biselli🇺🇸 and 134 other authors

   The cross section of the exclusive $\eta$ electroproduction reaction $ep\to e^{\prime }{p}^{\prime }\eta$ was measured at Jefferson Lab with a 5.75-GeV electron beam and the CLAS detector. Differential cross sections $d^4\sigma /dtd{Q}^{2}d{x}_{B}d{\varphi }_{\eta }$ and structure functions ${\sigma }_U={\sigma }_T+ϵ{\sigma }_L,{\sigma }_{TT}$ and ${\sigma }_{LT}$, as functions of $t$ were obtained over a wide range of $Q^2$ and $x_B$. The $\eta$ structure functions are compared with those previously measured for ${\pi }^0$ at the same kinematics. At low $t$, both ${\pi }^0$ and $\eta$ are described reasonably well by generalized parton distributions (GPDs) in which chiral-odd transversity GPDs are dominant. The ${\pi }^0$ and $\eta$ data, when taken together, can facilitate the flavor decomposition of the transversity GPDs.

   nucl-exhep-exhep-phPRC(2017)·30 citations
3. 03*

   Charge-state distribution of Li ions from the $\beta$ decay of laser-trapped ${}^6$He atoms

   Ran Hong🇺🇸 · Arnaud Leredde🇺🇸 · Yelena Bagdasarova🇺🇸 · Xavier Fléchard🇫🇷 · Alejandro García🇺🇸 · Andreas Knecht🇺🇸 · Peter Müller🇺🇸 · Oscar Naviliat-Cuncic🇺🇸 · Joben Pedersen🇺🇸 · Eric Smith🇺🇸 · Matthew Sternberg🇺🇸 · Derek W. Storm🇺🇸 and 3 other authors

   Background: The accurate determination of atomic final states following nuclear $\beta$ decay plays an important role in many experiments. In particular, the charge state distributions of ions following nuclear $\beta$ decay are important for determinations of the $\beta -\nu$ angular correlation with improved precision. Purpose: Our measurement aims at providing benchmarks to test theoretical calculations. Method: The kinematics of Li${}^{n+}$ ions produced following the $\beta$ decay of ${}^6\mathrm{He}$ within an electric field were measured using ${}^6\mathrm{He}$ atoms in the metastable $(1s2s,{}^3{S}_1)$ and in the $(1s2p,{}^3{P}_2)$ states confined by a magneto-optical trap. The electron shake-off probabilities were deduced including their dependence on ion energy. Results: We find significant discrepancies on the fractions of Li ions in the different charge states with respect to a recent calculation and discuss a plausible explanation. We also point out that there is no explanation for a large discrepancy between the same calculation and a previous measurement of the Li-ion energy dependence of the charge distribution from decays of the electronic ground state.

   nucl-exPRA(2017)·10 citations
4. 04*

   High precision half-life measurement of ${}^{147}$Sm $\alpha$ decay from thin-film sources

   Heinrich Wilsenach (1)🇩🇪 · Kai Zuber (1)🇩🇪 · Detlev Degering (2)🇩🇪 · René Heller (3) · Volker Neu (4) ((1) Institut für Kern- und Teilchenphysik, Technische Universität Dresden, (2) VKTA - Radiation Protection, Analytics and Disposal Rossendorf e.V., (3) Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf,(4) Institute for Metallic Materials, IFW Dresden)

   An investigation of the {\alpha}-decay of ${}^{147}$Sm was performed using an ultra low-background Twin Frisch-Grid Ionisation Chamber (TF-GIC). Four natural samarium samples were produced using pulsed laser deposition in ultra high vacuum. The abundance of the ${}^{147}$Sm isotope was mea- sured using inductively coupled plasma mass spectrometry. A combined half-life value for 147Sm of $1.079(26)\times 10^{11}$ years was measured. A search for the {\alpha}-decay into the first excited state of ${}^{143}$Nd has been performed using $\gamma$-spectroscopy, resulting in a lower half-life limit of $T_{1/2}>3.1\times 10^{18}$ years (at 90% C.L.).

   nucl-exphysics.ins-detPRC(2017)·12 citations
5. 05*

   Two-body Wave Functions, Compositeness, And The Internal Structure Of Dynamically Generated Resonances

   Takayasu Sekihara (JAEA, Ibaraki)🇯🇵 · Tetsuo Hyodo (Kyoto U., Yukawa Inst., Kyoto)🇯🇵 · Daisuke Jido (Tokyo Metropolitan U.)🇯🇵 · Junko Yamagata-Sekihara (Kyoto Sangyo U.)🇯🇵 · Shigehiro Yasui (Tokyo Inst. Tech.)🇯🇵

   Recently, the compositeness, defined as the norm of a two-body wave function for bound and resonance states, has been investigated to discuss the internal structure of hadrons in terms of hadronic molecular components. From the studies of the compositeness, it has been clarified that the two-body wave function of a bound state can be extracted from the residue of the scattering amplitude at the bound state pole. Of special interest is that the two-body wave function from the scattering amplitude is automatically normalized. In particular, while the compositeness is unity for energy-independent interactions, it deviates from unity for energy-dependent interactions, which can be interpreted as a missing-channel contribution. In this manuscript, we show the formulation of the two-body wave function from the scattering amplitude, evaluate the compositeness for several dynamically generated resonances such as $f_0(980)$, $\Lambda (1405)$, and $\Xi (1690)$, and investigate their internal structure in terms of the hadronic molecular components.

   ↳ hep-phhep-exnucl-exnucl-th+1PoS(2017)·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.