Cardella, G.Bonasera, A.Martorana, N. S.Acosta, L....
13页
查看更多>>摘要：We performed a refined analysis of the data collected with the CHIMERA detector with the aim of searching rare 3-alpha decay modes near the Hoyle state of 12C. In particular we investigated the direct and sequential decay modes of the Hoyle state including also the recently suggested Efimov state. The comparison of selected events with simulations constrains the precision achievable with measurements in different experimental conditions. We observe good sensitivities to different decay scenarios also in the CHIMERA spherical region notwithstanding its limited angular resolution. The search for the decay of the Efimov state in 12C was performed by using new selection strategies as suggested by simulations. The obtained results are not conclusive, however, we are able to exclude the presence of a sequential decay of this state, while our data could be compatible with its direct decay. (c) 2022 Elsevier B.V. All rights reserved.
查看更多>>摘要：The Lambda (1405) resonance below the antikaon-nucleon threshold is studied by solving homogeneous and inhomogeneous Lippmann-Schwinger equations for local KN Yukawa and Gaussian potentials within three-dimensional approach. In this method, unlike the partial wave method, in which the number of considered partial waves needs to increase with enhancing energy, the calculations are performed without decomposition into angular momentum components. Also, the behavior of the transition matrix in on-shell, half-off-shell, and fully off-shell modes for various energies is investigated.(c) 2022 Elsevier B.V. All rights reserved.
查看更多>>摘要：A study on the competition between alpha-decay and spontaneous fission (SF) of the Z = 120 isotopes with 283 <= A <= 350 is performed in this paper. The alpha-decay half-lives are evaluated using the modified generalized liquid drop model (MGLDM). The SF half-lives are calculated within the shell effect-dependent formula. It is found that the dominant decay mode of (294,295,297,298,301-304,308)120 is alpha-decay and the half-lives fall within the experimental limit (> 1 mu s). Then the decay properties of the alpha-decay chain of (294,295,297,298,301-304,308)120 are predicted within the MGLDM and the shell-effect dependent formula. These predictions are helpful for searching and identifying the new elements in future. Finally, the possibility of the cluster radioactivity of the Z = 120 isotopes is discussed within the MGLDM. By analyzing the competition between the cluster radioactivity and alpha-decay, it is found that the possibility of the cluster radioactivity is much smaller than the corresponding alpha-decay. (C)& nbsp;2022 Elsevier B.V. All rights reserved.
查看更多>>摘要：In this paper, we analyze the 11Be + 208Pb and 37Mg + 208Pb breakup reactions in the projectile zero binding energy limit. The objective is to verify whether finite and converged breakup observables can be obtained for an s-wave neutron-halo system when its ground-state binding energy approaches zero. Applying the CDCC formalism, we report that for both projectiles, finite and converged breakup cross sections are obtained despite the extension of the projectile ground-state wave functions to infinity. We argue that this is due to the square-integrability of the bin wave functions, which are involved in CDCC calculations. This is evidenced by the lack of convergence of the elastic scattering calculations, where the radial integral of the matrix elements contains the projectile ground-state density and is independent of the bin wave functions. These results could prove useful in the analysis of future experimental data in the breakup of extremely weakly-bound neutron-halo systems and may contribute towards a better understanding of open quantum systems. (c) 2022 Elsevier B.V. All rights reserved.
查看更多>>摘要：A theoretical study on nuclear fusion including deuteron-triton (D-T) and deuteron-helium-3 fusion (D-He-3) fusion in intense laser fields has been presented in this article. With the laser fields expected to be available soon, some quantitative results for the laser-induced modifications to the cross-sections are given. It is reported that the cross-section of the fusion reaction is more sensitive to the external laser fields when the incident nucleus has lower energy. An explicit generalized form of the Gamow penetrability factor is given for the predictions of the laser-induced effects for some other similar nuclear processes. (C)& nbsp;2022 Elsevier B.V. All rights reserved.
Amer, Ahmed HammadMahmoud, Zakaria M. M.Penionzhkevich, Yu E.
26页
查看更多>>摘要：The elastic scattering angular distributions of alpha + C-12 at energies ranging from 48.7 MeV to 386 MeV were analyzed in the framework the double folding optical Model (DFOM). The DFOM potential is used with three different nucleon-nucleon (NN) effective interactions. The three interactions are the density-and energy-dependent, CDM3Y6, the Sao Paulo (SPP2), and the energy-independent Brazilian Nuclear Potential (BNP). The optical potential (OP) is generated using semi-microscopic (SM) and fully microscopic (FM) methods. It is found that SPP2 and CDM3Y6 are more appropriate to reproduce all experimental data than BNP. The real and imaginary potential parameters and their volume integrals, and the reaction cross-sections of the system are given for each effective interaction model. (C) 2022 Elsevier B.V. All rights reserved.
查看更多>>摘要：In this paper, we attempt to discuss the topics mentioned in the title by scrutinizing and improving the 0(-+) pseudoscalar di-gluonia/glueballs sum rules within the standard SVZ-expansion at N2LO without instantons.& nbsp;First, we reconsider the estimate of the slope of the topological charge root chi'(0)(Q(2) = 2 GeV2) = 24.3(3.4) MeV from low degree moments which imply integral(1)(0) dxg(1)(P)(x) = 0.144(5) [data: 0.145(14)] for the first moment of the polarized proton structure function (proton spin) and G(A)((0))(10 GeV2) delta u + delta d + delta s = 0.340(50) [data = 0.330(39)] for the singlet form factor of the axial current.& nbsp;Second, we work with high degree moments and parametrize the spectral function beyond the mini-mal duality ansatz: "One resonance circle plus QCD continuum " to get the 0(-+) pseudoscalar di-gluonia spectra. Then, we obtain three groups of gluonia: The familiar light eta 1 [singlet gluon component of the eta'(958)] with [M-eta 1, f(eta 1)] = [825(45), 905(72)] MeV which is important for understanding the U(1)(A) anomaly; The two new medium gluonia with MP1a = 1338(112) MeV and [M-P1b = 1462(117) MeV or their mean [M-P1, f(P1)] = [1397(81), 594(144)] MeV which support the gluonium nature of the ex-cellent experimental candidate eta(1405) and may bring a small gluon piece to the eta (1295); their corre-sponding 1st radial excitations: M-P'1a= 1508(226)MeV and M-P'1b= 1553(139)MeV with their mean: [MP1', f(P1')] = [1541(118),205(282)]MeV which may be identified (up to some eventual mixings with q over line q states) with the observed eta (1475, 1700) states; The heavy gluonium with the mean mass: [M-P2, f(P2)] = [2751(140), 500(43)] MeV which can be compared with the lattice results. One can remark the (natural) one to one correspondence between the pseudoscalar gluonia and their chiral scalar analogue from Ref. [1]: sigma(1) -> eta(1); G1(1.55) -> P1; [sigma'(1.1), G'(1.56)] -> P-1a,P-1b'; G2(3) -> P(2 )which is mainly due to the importance of the QCD PT contributions in the sum rule analysis that are almost equal in these two channels. (c) 2022 Elsevier B.V. All rights reserved.
Bholane, G. T.Ganesapandy, T. S.Phatangare, A. B.Attar, F. M. D....
30页
查看更多>>摘要：The cross sections of the nuclear reactions 142Nd(n,2n)141Nd, 148Nd(n,2n)147Nd, 150Nd(n,2n)149Nd, 142Nd(n,2n)141mNd and 146Nd(n,p)146Pr at 14.77 MeV neutron energy and the cross section of the 142Nd(gamma ,n)141Nd, 148Nd(gamma ,n)147Nd and 150Nd(gamma ,n)149Nd nuclear reaction at 10 and 15 MeV bremsstrahlung endpoint energies were measured using offline gamma spectroscopy. The photon-induced cross sections are reported for the first time at 10 MeV and 15 MeV bremsstrahlung endpoint energies. The uncertainties in the measured data were calculated using covariance analysis. The experimental results were compared with the previously reported EXFOR data and with the evaluated nuclear data libraries ENDF/B.-VIII.0, JEFF-3.3, JENDL-4.0, CENDL-3.2 and TENDL-2019. The theoretical nuclear model calculations were performed using the TALYS-1.95 code with default and optimized input parameters tuned to reproduce the present and literature data. The present data are in good agreement with other literature and evaluated data. The results are useful for the development of particle accelerators, reactors and the EXFOR database. (c) 2022 Elsevier B.V. All rights reserved.
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