2,178 research outputs found
The reaction of triple radiative capture alpha alpha(n,gamma)Be-9 studied in a beta decay of Li-9
No full textObservation of Structures in the Processes e+e- →ωχc1 and ωχc2
No full textWe present measurements of the Born cross sections for the processes e+e-→ωχc1 and ωχc2 at center-of-mass energies s from 4.308 to 4.951 GeV. The measurements are performed with data samples corresponding to an integrated luminosity of 11.0 fb-1 collected with the BESIII detector operating at the Beijing Electron Positron Collider storage ring. Assuming the e+e-→ωχc2 signals come from a single resonance, the mass and width are determined to be M=(4413.6±9.0±0.8) MeV/c2 and Γ=(110.5±15.0±2.9) MeV, respectively, which is consistent with the parameters of the well-established resonance ψ(4415). In addition, we also use one single resonance to describe the e+e-→ωχc1 line shape and determine the mass and width to be M=(4544.2±18.7±1.7) MeV/c2 and Γ=(116.1±33.5±1.7) MeV, respectively. The structure of this line shape, observed for the first time, requires further understanding. © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.<br/
Systematics of Gamow-Teller beta decay "Southeast" of Sn-100
No full textThe energy centroids and integrated strengths of Gamow-Teller transitions in the beta(+) and electron-capture decay are analyzed for nuclei whose proton number Z and neutron number N are restricted to 4
Measurement of the cross sections for e+e- →ηπ+π- at center-of-mass energies between 2.00 and 3.08 GeV
No full textUsing data samples collected at center-of-mass energies between 2.000 and 3.080 GeV with the BESIII detector operating at the BEPCII collider, a partial-wave analysis is performed on the process e+e-→ηπ+π-. In addition to the dominant e+e-→ρη component, the e+e-→a2(1320)π process is also sizable, contributing up to 24% of the total reaction. The measured cross sections of the process e+e-→ηπ+π- are systematically higher than those of BABAR by more than 3σ at center-of-mass energies between 2.000 and 2.300 GeV. In the cross section line shape for e+e-→a2(1320)π, a resonant structure is observed with a significance of 5.5σ, with M=(2044±31±4) MeV/c2, Γ=(163±69±24) MeV, and BR·Γe+e-R=(34.6±17.1±6.0) eV or (137.1±73.3±2.1) eV. In the cross section line shape for e+e-→ρη, an evidence of a dip structure around 2180 MeV/c2 is observed with statistical significance of 3.0σ. © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.<br/
Beta-decay spectroscopy of 103, 105Sn
No full textExperimental and theoretical β-decay properties of 103, 105Sn are discussed
Beta decay of 103Sn
No full textThe β decay of 103Sn, a three-neutron-particle nucleus with respect to the 100Sn core, was investigated at the GSI on-line mass separator using an array of 17 germanium crystals and a total absorption spectrometer. A total of 31 β-delayed γ-rays (29 new) of the 103Sn →103 In decay were observed and, on the basis of β-γ-γ coincidences, the 103Sn decay scheme was established for the first time. By means of total absorption spectroscopy, β intensities, the Gamow-Teller strength distribution and the summed Gamow-Teller strength value of 3.5±0.5 were determined for this decay. Its half-life and Q
EC value were found to be 7.0±0.2 s and 7.64±0.7 MeV, respectively. The β-delayed proton branching ratio was measured to be 1.2±0.1%. The results are discussed in comparison with shell-model predictions based on realistic and empirical interactions
Beta decay of 101Sn
No full textβ decay of the very neutron-deficient isotope 101Sn was studied at the GSI on-line mass separator using silicon detectors for recording charged particles and germanium detectors for γ-ray spectroscopy. Based on the β-delayed proton data the production cross-section of 101Sn in the 50Cr + 58Ni fusion-evaporation reaction was determined to be about 60nb. The half-life of 101Sn was measured to be 1.9(3)s. For the first time β-delayed γ-rays of 101Sn were tentatively identified, yielding weak evidence for a cascade of 352 and 1065keV transitions in 101In. The results for the 101Sn decay as well as those from previous work on the 103Sn decay are discussed by comparing them to predictions obtained from shell model calculations employing a new interaction in the 88Sr to 132Sn model space
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