We studied the β-decay properties of neutron-rich 85Ga produced in proton-induced fission of 238U at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. Data consisted of ...β-γ and β-γ-γ coincidences were collected at the Low-energy Radioactive Ion Beam Spectroscopy Station after high-resolution on-line mass separation. For the first time, the excited states in the N=53 isotone 85Ge were established from β-delayed γ decay of 85Ga. The level scheme of the N=52 isotone 84Ge was improved and includes now 0+, 2+, (2)+, 4+, and (0)+ states populated in the β-delayed-neutron-γ decay of 85Ga. Advanced shell-model calculations were used to analyze experimental data on 85Ge and 84Ge.
Particle radioactivity studies using the XIA DGF-4C digital signal processing units at the Recoil Mass Separator of Oak Ridge National Laboratory are presented. Proton emission signals were observed ...starting from 500 ns after recoil implantation. An energy threshold below 100 keV for particle detection was achieved. For the
145Tm and
146Tm decay, evidence for the fine structure in proton emission was obtained. An experiment to search for a new proton emitter
149Lu is described as an example where the combination of a
56Ni radioactive beam and digital signal processing is a major advantage.
Beta-decay studies near 100Sn Karny, M.; Batist, L.; Banu, A. ...
The European physical journal. A, Hadrons and nuclei,
09/2005, Letnik:
25, Številka:
S1
Journal Article
Recenzirano
The {beta}-decay of {sup 102}Sn was studied by using high-resolution germanium detectors as well as a Total Absorption Spectrometer (TAS). A decay scheme has been constructed based on the ...{gamma}-{gamma} coincidence data. The total experimental Gamow-Teller strength B{sub GT}{sup exp} of {sup 102}Sn was deduced from the TAS data to be 4.2(9). A search for {beta}-delayed {gamma}-rays of {sup 100}Sn decay remained unsuccessful. However, a Gamow-Teller hindrance factor h = 2.2(3), and a cross-section of about 3nb for the production of {sup 100}Sn in fusion-evaporation reaction between {sup 58}Ni beam and {sup 50}Cr target have been estimated from the data on heavier tin isotopes. The estimated hindrance factor is similar to the values derived for lower shell nuclei.
Beta decay of $^{50}$Ni Mazzochi, C.; Badura, E.; Bingham, C. ...
The European physical journal. A, Hadrons and nuclei,
07/2003, Letnik:
17
Journal Article
The production of very neutron-deficient isotopes near 100Sn has been investigated by using on-line mass separation of evaporation residues produced by heavy-ion induced complete-fusion reactions. We ...measured the cross sections for 99Cd, 100In, 101Sn and 102In via 58Ni+58Ni fusion reactions followed by cluster emission, and via 58Ni+50Cr fusion reactions accompanied by evaporation of protons, neutrons or α particles. Both types of reactions yield similar cross sections for the production of exotic nuclei near 100Sn. The data are discussed in comparison with results obtained from statistical-model calculations.
Neutron beta decay is one of the most fundamental processes in nuclear physics and provides sensitive means to uncover the details of the weak interaction. Neutron beta decay can evaluate the ratio ...of axial-vector to vector coupling constants in the standard model, \(\lambda = g_A / g_V\), through multiple decay correlations. The Nab experiment will carry out measurements of the electron-neutrino correlation parameter \(a\) with a precision of \(\delta a / a = 10^{-3}\) and the Fierz interference term \(b\) to \(\delta b = 3\times10^{-3}\) in unpolarized free neutron beta decay. These results, along with a more precise measurement of the neutron lifetime, aim to deliver an independent determination of the ratio \(\lambda\) with a precision of \(\delta \lambda / \lambda = 0.03\%\) that will allow an evaluation of \(V_{ud}\) and sensitively test CKM unitarity, independent of nuclear models. Nab utilizes a novel, long asymmetric spectrometer that guides the decay electron and proton to two large area silicon detectors in order to precisely determine the electron energy and an estimation of the proton momentum from the proton time of flight. The Nab spectrometer is being commissioned at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source at Oak Ridge National Lab. We present an overview of the Nab experiment and recent updates on the spectrometer, analysis, and systematic effects.
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