No abstract available

[en] Highlights: ► Heavy metals and PAHs were removed from contaminated soils by UESR. ► The treatment duration, initial soil water content and soil type was examined. ► Cadmium has the higher removal efficiency followed by zinc and lead. ► The removal efficiency of PAHs was poor compared to heavy metals. - Abstract: This study presents the feasibility of using the vertical electrokinetic-flushing technology for the simultaneous removal of cadmium (Cd), lead (Pb), zinc (Zn), as well as phenanthrene and pyrene from contaminated soils. Eight vertical bench-scale electrokinetic-flushing experiments were conducted analyzing the effect of treatment duration, initial soil water content and soil type. The highest removal efficiency was achieved for Cd (82%), followed by Zn (73%) and Pb (37%) from natural soil after 8 days of treatment with water content 60%. The study demonstrated that the metals were extracted from the soil mainly due to the dominated low pH conditions and vertically migrated from anode towards the cathode. Besides, it was found that the removal efficiency was increased in the experiments with higher treatment duration, while the higher soil water content further enhances metals removal. In terms of the organic pollutants, under the conditions conducted the electrokinetic-flushing treatment, low removal efficiency for phenanthrene (29%) and pyrene (19%) was achieved. However, it is noticeable that without the use of any solubilizing agent the organic pollutants could be removed following the movement of the pore fluid.

No abstract available

[en] The ⁷⁶Ge(¹⁴C,¹⁶O,¹⁷O)⁷⁴Zn,⁷³Zn reactions have been studied at 72 MeV bombarding energy. The mass excesses of ⁷³Zn and ⁷⁴Zn were determined to be -65.41+-.04 and -65.62+-.04 MeV, respectively. In addition previously unknown excited levels were identified in both nuclei. The structure of ⁷³Zn is discussed in terms of H.F.B. calculations

[en] Nuclear spectroscopic information for known nuclides of mass number 73 (Co,Ni,Cu,Zn,Ga,Ge,As,Se,Br,Kr, Rb,Sr)has been evaluated and presented together with adopted energies and J d of levels in these nuclei.No data are yet available for excited states in ⁷³Co, ⁷³Ni and ⁷³Sr. The existence and decay of a 5.8-s isomer in ⁷³Zn remain uncertain.The isomeric decay of 107-ns isomer in ⁷³Kr suffers from poor intensity balance at the first excited state.This evaluation supersedes earlier complete evaluations published by [Nucl.Data Sheets 69 (1993) 857], [Nucl.Data Sheets 29 (1980) 1] and [Nucl.Data Sheets 13 (1974) 305]; and an update by [Nucl.Data Sheets 51 (1987) 161]

[en] The rapid neutron-capture or the r-process is responsible for the origin of about half of the neutron-rich atomic nuclei in the universe heavier than iron. For the calculation of the abundances of those nuclei, atomic masses are required as one of the input parameters with very high precision. In the present work, the masses of the neutron rich Zn isotopes (A=71 to 81) lying in the r-process path have been measured in the ISOLTRAP experiment at ISOLDE/CERN. The mass of ⁸¹Zn has been measured directly for the rst time. The half-lives of the nuclides ranged from 46.5 h (⁷²Zn) down to 290 ms (⁸¹Zn). In case of all the nuclides, the relative mass uncertainty (Δm=m) achieved was in the order of 10^-8 corresponding to a 100-fold improvement in precision over previous measurements. (orig.)

[en] Background: The recent observation of a neutron-star merger finally confirmed one astrophysical location of the rapid neutron-capture process (r-process). Evidence of the production of A < 140 nuclei was seen, but there is still little detailed information about how those lighter elements are produced in such an environment. Many of the questions surrounding the A ≈ 80 nuclei are likely to be answered only when the nuclear physics involved in the production of r-process nuclei is well understood. Neutron-capture reactions are an important component of the r-process, and neutron-capture cross sections of r-process nuclei, which are very neutron rich, havemore » large uncertainties. Purpose: Indirectly determine the neutron-capture cross section and reaction rate of ⁷³Zn(n,γ)⁷⁴Zn. Methods: The nuclear level density (NLD) and γ-ray strength function (γSF) of ⁷⁴Zn were determined following a total absorption spectroscopy (TAS) experiment focused on the β decay of ⁷⁴Cu into ⁷⁴Zn performed at the National Superconducting Cyclotron Laboratory. The NLD and γSF were used as inputs in a Hauser-Feshbach statistical model to calculate the neutron-capture cross section and reaction rate. Results: The NLD and γSF of ⁷⁴Zn were experimentally constrained for the first time using β-delayed γ rays measured with TAS and the β-Oslo method. The NLD and γSF were then used to constrain the neutron-capture cross section and reaction rate for the ⁷³Zn(n, γ)⁷⁴Zn reaction. In Conclusion, the uncertainty in the neutron-capture cross section and reaction rate of ⁷³Zn(n, γ)⁷⁴Zn calculated in TALYS was reduced to under a factor of 2 from a factor of 5 in the cross section and a factor of 11 in the reaction rate using the experimentally obtained NLD and γSF.

[en] The 1987 evaluation of A = 73 has been revised using experimental decay and reaction data received by the cutoff date of March 9, 1993

No abstract available

[en] High-precision mass measurements on neutron-rich zinc isotopes ^71m,72-81Zn have been performed with the Penning trap mass spectrometer ISOLTRAP. For the first time, the mass of ⁸¹Zn has been experimentally determined. This makes ⁸⁰Zn the first of the few major waiting points along the path of the astrophysical rapid neutron-capture process where neutron-separation energy and neutron-capture Q-value are determined experimentally. The astrophysical conditions required for this waiting point and its associated abundance signatures to occur in r-process models can now be mapped precisely. The measurements also confirm the robustness of the N=50 shell closure for Z=30