32 research outputs found

    Single-Proton Removal Reaction Study of 16B

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    The low-lying level structure of the unbound system 16^{16}B has been investigated via single-proton removal from a 35 MeV/nucleon 17^{17}C beam. The coincident detection of the beam velocity 15^{15}B fragment and neutron allowed the relative energy of the in-flight decay of 16^{16}B to be reconstructed. The resulting spectrum exhibited a narrow peak some 85 keV above threshold. It is argued that this feature corresponds to a very narrow (Γâ‰Ș\Gamma \ll 100 keV) resonance, or an unresolved multiplet, with a dominant π(p3/2)−1⊗Μ(d5/23)J=3/2+\pi (p_{3/2})^{-1} \otimes \nu (d_{5/2}^3)_{J=3/2^+} + π(p3/2)−1⊗Μ(d5/22,s1/2)J=3/2+\pi (p_{3/2})^{-1} \otimes \nu (d_{5/2}^2,s_{1/2})_{J=3/2^+} configuration which decays by d-wave neutron emission.Comment: 16 pages, 5 figures, 1 table, submitted to Phys. Lett.

    TRY plant trait database – enhanced coverage and open access

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    Plant traits—the morphological, anatomical, physiological, biochemical and phenological characteristics of plants—determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research spanning from evolutionary biology, community and functional ecology, to biodiversity conservation, ecosystem and landscape management, restoration, biogeography and earth system modelling. Since its foundation in 2007, the TRY database of plant traits has grown continuously. It now provides unprecedented data coverage under an open access data policy and is the main plant trait database used by the research community worldwide. Increasingly, the TRY database also supports new frontiers of trait‐based plant research, including the identification of data gaps and the subsequent mobilization or measurement of new data. To support this development, in this article we evaluate the extent of the trait data compiled in TRY and analyse emerging patterns of data coverage and representativeness. Best species coverage is achieved for categorical traits—almost complete coverage for ‘plant growth form’. However, most traits relevant for ecology and vegetation modelling are characterized by continuous intraspecific variation and trait–environmental relationships. These traits have to be measured on individual plants in their respective environment. Despite unprecedented data coverage, we observe a humbling lack of completeness and representativeness of these continuous traits in many aspects. We, therefore, conclude that reducing data gaps and biases in the TRY database remains a key challenge and requires a coordinated approach to data mobilization and trait measurements. This can only be achieved in collaboration with other initiatives

    Kalibration des 4#pi# BGO Summenenergie- und #gamma#-Multiplizitaetsfilters des OSIRIS-Spektrometers

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    SIGLEAvailable from TIB Hannover: RA 831(2594) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

    Spektroskopie der schweren neutronenarmen Kerne "1"8"9Pb und "1"9"9At, sowie des Kerns "5"7Ni und Entwicklung eines Detektors fuer Verdampfungsrestkerne

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    In this thesis the study of prompt #gamma#-transitions in "1"8"9Pb by means of the reaction "1"5"7Gd("3"6Ar,4n) at 173.0 MeV, in "1"9"9At by means of the reaction "1"7"5Lu("2"8Si,4n) at 141.0 MeV, and "5"7Ni by means of the reaction "4"0Ca("2"0Ne,2pn) at 68.0 MeV is described. First the evaporation residue detector is described, which is based on the production of secondary electrons in the passage of the recoils through a thin mylar foil (0.5 respectively 2.0 #mu#m thickness). By means of #gamma#-#gamma# coincidence measurements the transitions could be assigned to the specified nuclei. For the studied nuclei level schemes were established and discussed. For "5"7Ni J"#pi# assignments have been made by means of a DCO analysis. (HSI)Available from TIB Hannover: RA 831(3171) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

    Rotational bands in 167Hf

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    High-spin states in 167^{167}Hf, populated in the 141^{141}Pr(30^{30}Si, p3n)167^{167}Hf reaction, have been studied using the nordball Ge detector array. Three rotational cascades have been observed for the first time and the previously-known level scheme has been extended to significantly higher spin. Band-crossing effects are discussed within the framework of Woods-Saxon cranking calculations and are found to be in good agreement

    High spin studies of neutron-rich 166Er

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    High spin states of Tm were populated in the fusion of 55MeV Li ions with a Dy target. The GASP γ−detector array at the INFN Laboratory, Legnaro, Italy was used for this work. The present data has allowed the yrast decay sequence of Tm to be seen to spin 61/2ħ. The 1/2[411] ground state band has been extended to 51/2ħ and the 7/2 [404] and 7/2 [523] bands have been extended to spin 43/2 and 39/2 respectively. The experiment conducted at LNL was designed to study the incomplete fusion of Li ions with Dy, yielding neutron-rich Er isotopes around mass 166. An offshoot of the experimental data was the production of Tm in the fusion-evaporation reaction involving 4n evaporation

    In-beam \mth{\gamma}-ray spectroscopy of \chem{^{42}Ca}

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    High-spin states of the 42^{42}Ca nucleus, populated in the 68 MeV 18^{18}O + 30^{30}Si reaction, have been studied in a γ\gamma-γ\gamma-recoil coincidence experiment. The level scheme of 42^{42}Ca has been extended up to 13.7  MeV. An elaborate decay pattern with various paths, together with high-quality DCO and polarization information assigns spins and parities for almost all observed levels. The sequence of non-yrast positive-parity states is discussed and compared with highly deformed bands in 36^{36}Ar and 40^{40}Ca
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