Dipole response in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Te</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>128</mml:mn><mml:mo>,</mml:mo><mml:mn>130</mml:mn></mml:mrow></mml:mmultiscripts></mml:math> below the neutron threshold

نویسندگان

چکیده

Background: Numerous studies of the ground-state decay pygmy dipole resonance (PDR) have been carried out in past. However, data on PDR to low-lying excited states is still very scarce due limitations sensitivity weak branching transitions experimental setups.Purpose: We present a detailed examination low-energy response $^{128}\mathrm{Te}$ and $^{130}\mathrm{Te}$ below their neutron separation thresholds 8.8 8.5 MeV, respectively.Methods: Photonuclear reactions with subsequent $\ensuremath{\gamma}$-ray spectroscopy channel continuous-energy bremsstrahlung at varying endpoint energies linearly polarized quasimonochromatic beams ranging from 2.7 8.9 MeV steps roughly 250 keV were used for probing behavior $^{130}\mathrm{Te}$. In addition, $(\stackrel{P\vec}{\ensuremath{\gamma}},{\ensuremath{\gamma}}^{\ensuremath{'}}{\ensuremath{\gamma}}^{\ensuremath{'}\ensuremath{'}})$ study population $^{128}\mathrm{Te}$.Results: Spin-parity quantum numbers reduced transition probabilities are determined individual photo-excited states. The analysis average properties nuclear levels narrow excitation-energy bins enable extraction photoabsorption cross sections, ratios ${2}_{1}^{+}$ state, distinction between $E1$ $M1$ ground state accounting resolved unresolved transitions.Conclusions: Above 5 reasonable agreement calculations within quasiparticle phonon model. major fraction transitions, while less than $5--10$% stem transitions. Furthermore, first direct evidence provided that via primary region 9 dominated by ${1}^{\ensuremath{-}}$

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ژورنال

عنوان ژورنال: Physical Review C

سال: 2021

ISSN: ['2470-0002', '2469-9985', '2469-9993']

DOI: https://doi.org/10.1103/physrevc.103.044317