Highlights
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Elastic scattering of 13C and 14C isotopes on a 208Pb target at energies of approximately five times the Coulomb barriers
2024, 48(3): 034001. doi: 10.1088/1674-1137/ad1678The elastic scattering angular distributions of
$ ^{13} $ C at 340 MeV and$ ^{14} $ C at 294 MeV and 342 MeV on a$ ^{208} $ Pb target, which correspond to approximately five times the Coulomb barriers, were measured at the Radioactive Ion Beam Line in Lanzhou. The data were analyzed within the optical model and continuum-discretized coupled-channels (CDCC) framework, and the results of both calculations could effectively account for the experimental data. The differential cross sections of elastic scattering revealed no particular suppression at the Coulomb nuclear interference peak angles, suggesting that the breakup coupling effects on the elastic scattering angular distributions were negligibly small in this incident energy region. The contributions from the couplings with inelastic states to the elastic cross sections were of minor importance within the angular range covered by these experiments. -
Quasinormal modes and isospectrality of Bardeen (Anti-) de Sitter black holes
2024, 48(3): 035102. doi: 10.1088/1674-1137/ad1ed8Black holes (BHs) exhibiting coordinate singularities but lacking essential singularities throughout the spacetime are referred to as regular black holes (RBHs). The initial formulation of RBHs was presented by Bardeen, who considered the Einstein equation coupled with a nonlinear electromagnetic field. In this study, we investigate the gravitational perturbations, including the axial and polar sectors, of the Bardeen (Anti-) de Sitter black holes. We derive the master equations with source terms for both axial and polar perturbations and subsequently compute the quasinormal modes (QNMs) through numerical methods. For the Bardeen de Sitter black hole, we employ the 6th-order WKB approach. The numerical results reveal that the isospectrality is broken in this case. Conversely, the QNM frequencies are calculated using the HH method for the Bardeen Anti-de Sitter black hole.
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What can we learn from recent 2νββ experiments?
2024, 48(3): 034101. doi: 10.1088/1674-1137/ad181bRecent measurements of the two neutrino double beta decay high precision electron spectra, combined with charge exchange or β-decay experimental data, have revealed severe constraints across current nuclear many body calculations. Our calculations show that the quasi-particle random phase approximation (QRPA) approach can adequately reproduce the measured spectra for the two open shell nuclei,
$ ^{82} $ Se and$ ^{100} $ Mo. For the closed shell nucleus$ ^{136} $ Xe, QRPA can also reproduce the spectra with proper treatments. Considering the high-lying state reduction, we also find that the nuclear shell model can also adequately reproduce the spectra and Gamow-Teller transition strength under a unique quenched axial-vector coupling constant$ g_A $ . For$ ^{136} $ Xe, we find that flipping the sign for the decay strength causes the spectra to go beyond the so-called high-lying state dominance hypothesis. These results call for future high precision measurements of charge-exchange reactions.
Just Accepted
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Systematic study of cluster radioactivity within the Generalized Liquid Drop Model
Published: 2024-03-13
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Investigation for
$ { \boldsymbol D^{\bf +} \boldsymbol\to \boldsymbol\pi^{\bf +} \boldsymbol\nu\bar{\boldsymbol\nu}} $ decay process within QCDSR approachPublished: 2024-03-13 -
A study of U-isotope ground state properties with Covariant Energy Density Functional
Published: 2024-03-11
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Test particles and quasiperiodic oscillations around Kiselev black hole with cloud of strings
2024, 48(4): 045109-045109-16. doi: 10.1088/1674-1137/ad2060Show AbstractIn the present work, we study the dynamics of test particles around a Schwarzschild black hole surrounded by quintessence and immersed in a scalar string cloud field. We start our study by defining the possible values of quintessence and cloud of string parameters corresponding to the existence of the black hole horizon for the fixed values of the parameter of the equation of state for dark energy. We also study the behavior of the effective potential for the circular motion of test particles, energy, and angular momentum of the particles together with innermost stable circular orbits (ISCOs). We investigate the fundamental frequencies in the particles' oscillations along stable circular orbits. We related the stability of the orbits to the Lyapunov exponent, and the chaotic behavior is studied graphically. Finally, we apply the fundamental frequencies to describe quasiperiodic oscillations (QPOs), and it is obtained that in the presence of both fields low-frequency twin-peak QPOs are not observed. Also, we obtain constraint values for the string clouds parameter and mass of the black hole candidates located in the center of the microquasars GRO J1655-40 & GRS 1915+105 and Milky Way galaxy.
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α-particle preformation factors in heavy and superheavy nuclei
2024, 48(4): 044105-044105-13. doi: 10.1088/1674-1137/ad21e9Show AbstractIn this study, α-particle preformation factors in heavy and superheavy nuclei from 220Th to 294Og are investigated. By combing experimental α decay energies and half-lives, the α-particle preformation factors
$ P_{\alpha} $ are extracted from the ratios between theoretical α decay half-lives calculated using the Two-Potential Approach (TPA) and experimental data. We find that the α-particle preformation factors exhibit a noticeable odd-even staggering behavior, and unpaired nucleons inhibit α-particle preformation. Moreover, we find that both the α decay energy and mass number of parent nucleus exhibit considerable regularity with the extracted experimental α-particle preformation factors. After considering the major physical factors, we propose a local phenomenological formula with only five valid parameters for α-particle preformation factors$ P_{\alpha} $ . This analytic expression has a clear physical meaning as well as good precision. As an application, this analytic formula is extended to estimate the α-particle preformation factors and further predict the α decay half-lives for unknown even-even nuclei with Z = 118 and 120. -
Solar neutrino background in high-pressure gaseous 82SeF6 TPC neutrinoless double beta decay experiments
2024, 48(4): 043003-043003-14. doi: 10.1088/1674-1137/ad2675Show AbstractIn this study, the possibility of observing a solar neutrino background in a future neutrinoless double beta decay experiment using a high-pressure gaseous 82SeF6 TPC is investigated. Various contributions are simulated, and possible features that could be used for event classification are discussed; two types of backgrounds are identified. The rate of multi-site background events is approximately 0.63 events/(ton·yr) in a 30 keV ROI window. This background could be effectively reduced to less than 0.0001 events/(ton·yr) (95% C.L.) while maintaining a high signal efficiency of 93% by applying a selection based on the number of clusters and energy of the leading cluster. The rate of the single-electron background events is approximately 0.01 events/(ton·yr) in the ROI. Assuming a reduction factor of 10 for the single-electron background events obtained via the algorithms developed for radioactive background rejection, the total background induced by the solar neutrino would be 0.001 events/(ton·yr), which is sufficiently small for conducting ton-level experiments.
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