2017 Vol. 41, No. 6
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2017, 41(6): 063001. doi: 10.1088/1674-1137/41/6/063001
Abstract:
By analyzing the large-angle Bhabha scattering events e+e-→(γ)e+e- and diphoton events e+e-→(γ)γγ for the data sets collected at center-of-mass (c.m.) energies between 2.2324 and 4.5900 GeV (131 energy points in total) with the upgraded Beijing Spect...
By analyzing the large-angle Bhabha scattering events e+e-→(γ)e+e- and diphoton events e+e-→(γ)γγ for the data sets collected at center-of-mass (c.m.) energies between 2.2324 and 4.5900 GeV (131 energy points in total) with the upgraded Beijing Spect...
2017, 41(6): 063101. doi: 10.1088/1674-1137/41/6/063101
Abstract:
We investigate new physics effects on the Wtb effective couplings in a model-independent framework. The new physics effects can be parametrized by four independent couplings, f1L, f1R, f2L and f2R. We further introduce a set of parameters x0, xm, xp ...
We investigate new physics effects on the Wtb effective couplings in a model-independent framework. The new physics effects can be parametrized by four independent couplings, f1L, f1R, f2L and f2R. We further introduce a set of parameters x0, xm, xp ...
2017, 41(6): 063102. doi: 10.1088/1674-1137/41/6/063102
Abstract:
The discovery of unexpected properties of the Higgs boson would o er an intriguing opportunity to shed light on some of the most profound puzzles in particle physics. Beyond Standard Model (BSM) decays of the Higgs boson could reveal new physics in a...
The discovery of unexpected properties of the Higgs boson would o er an intriguing opportunity to shed light on some of the most profound puzzles in particle physics. Beyond Standard Model (BSM) decays of the Higgs boson could reveal new physics in a...
2017, 41(6): 063103. doi: 10.1088/1674-1137/41/6/063103
Abstract:
We calculate the contributions of a general non-vacuum conformal family to Rényi entropy in two-dimensional conformal field theory (CFT). The primary operator of the conformal family can be either non-chiral or chiral, and we denote its scaling dimen...
We calculate the contributions of a general non-vacuum conformal family to Rényi entropy in two-dimensional conformal field theory (CFT). The primary operator of the conformal family can be either non-chiral or chiral, and we denote its scaling dimen...
2017, 41(6): 063104. doi: 10.1088/1674-1137/41/6/063104
Abstract:
The Eigenstate Method has been developed to deduce the fermion propagator with a constant external magnetic field. In general, we find its result is equivalent to other methods and this new method is more convenient, especially when one evaluates the...
The Eigenstate Method has been developed to deduce the fermion propagator with a constant external magnetic field. In general, we find its result is equivalent to other methods and this new method is more convenient, especially when one evaluates the...
2017, 41(6): 063105. doi: 10.1088/1674-1137/41/6/063105
Abstract:
A recent experimental study of excited 8Be decay to its ground state revealed an anomaly in the angular distribution of the final states. This exceptional result is attributed to a new vector gauge boson X(16.7). We study the significance of this new...
A recent experimental study of excited 8Be decay to its ground state revealed an anomaly in the angular distribution of the final states. This exceptional result is attributed to a new vector gauge boson X(16.7). We study the significance of this new...
2017, 41(6): 064101. doi: 10.1088/1674-1137/41/6/064101
Abstract:
We consider the systematics of α-decay half-lives of super-heavy nuclei versus the decay energy and the total α-kinetic energy. We calculate the half-lives using the experimental Qα values. The computed half-lives are compared with the experimental d...
We consider the systematics of α-decay half-lives of super-heavy nuclei versus the decay energy and the total α-kinetic energy. We calculate the half-lives using the experimental Qα values. The computed half-lives are compared with the experimental d...
2017, 41(6): 064102. doi: 10.1088/1674-1137/41/6/064102
Abstract:
The role of positive Q-value neutron transfers in sub-barrier fusion reactions has been studied with a modified quantum coupled channels model with all order couplings (CCFULL model). Neutron rearrangement related only to the dynamical matching condi...
The role of positive Q-value neutron transfers in sub-barrier fusion reactions has been studied with a modified quantum coupled channels model with all order couplings (CCFULL model). Neutron rearrangement related only to the dynamical matching condi...
2017, 41(6): 064103. doi: 10.1088/1674-1137/41/6/064103
Abstract:
Within the alpha-cluster model, we particularly investigate the alpha decay of exotic nuclei in the vicinity of the N=126 neutron shell plus the Z=82 proton shell. The systematics of alpha-preformation probability (Pα), as an indicator of the shell e...
Within the alpha-cluster model, we particularly investigate the alpha decay of exotic nuclei in the vicinity of the N=126 neutron shell plus the Z=82 proton shell. The systematics of alpha-preformation probability (Pα), as an indicator of the shell e...
2017, 41(6): 064104. doi: 10.1088/1674-1137/41/6/064104
Abstract:
Alpha-induced reactions on 154Sm, 233,235,236,238U, and 237Np deformed nuclei are studied theoretically. The effects of hexadecapole deformation, deformed surface diffuseness parameter, and orientation on barrier height and position, fusion cross-sec...
Alpha-induced reactions on 154Sm, 233,235,236,238U, and 237Np deformed nuclei are studied theoretically. The effects of hexadecapole deformation, deformed surface diffuseness parameter, and orientation on barrier height and position, fusion cross-sec...
2017, 41(6): 064105. doi: 10.1088/1674-1137/41/6/064105
Abstract:
The nuclear structure of the actinide even-even thorium isotopes from A=230-234 have been investigated within the framework of the Interacting Boson Model (IBM-1). Predictions are given for the excited state energies for the ground state, β and γ -ba...
The nuclear structure of the actinide even-even thorium isotopes from A=230-234 have been investigated within the framework of the Interacting Boson Model (IBM-1). Predictions are given for the excited state energies for the ground state, β and γ -ba...
2017, 41(6): 065101. doi: 10.1088/1674-1137/41/6/065101
Abstract:
It has recently been pointed out that, under certain conditions, the energy of particles accelerated by black holes in the center-of-mass frame can become arbitrarily high. In this paper, we study the collision of two particles in the case of four-di...
It has recently been pointed out that, under certain conditions, the energy of particles accelerated by black holes in the center-of-mass frame can become arbitrarily high. In this paper, we study the collision of two particles in the case of four-di...
2017, 41(6): 065102. doi: 10.1088/1674-1137/41/6/065102
Abstract:
Recent observations show that the electromagnetic fine-structure constant, αe, may vary with space and time. In the framework of Finsler spacetime, we propose here an anisotropic cosmological model, in which both spatial and temporal variations of αe...
Recent observations show that the electromagnetic fine-structure constant, αe, may vary with space and time. In the framework of Finsler spacetime, we propose here an anisotropic cosmological model, in which both spatial and temporal variations of αe...
2017, 41(6): 065103. doi: 10.1088/1674-1137/41/6/065103
Abstract:
Hannay's angle is a classical analogue of the “geometrical phase factor” found by Berry in his research on the quantum adiabatic theorem. This classical analogue is defined if closed curves of constant action variables return to the same curves in ph...
Hannay's angle is a classical analogue of the “geometrical phase factor” found by Berry in his research on the quantum adiabatic theorem. This classical analogue is defined if closed curves of constant action variables return to the same curves in ph...
2017, 41(6): 065104. doi: 10.1088/1674-1137/41/6/065104
Abstract:
The statistical properties of the soft gamma repeater SGR J1550-5418 are investigated carefully. We find that the cumulative distributions of fluence, peak flux and duration can be well fitted by a bent power law, while the cumulative distribution of...
The statistical properties of the soft gamma repeater SGR J1550-5418 are investigated carefully. We find that the cumulative distributions of fluence, peak flux and duration can be well fitted by a bent power law, while the cumulative distribution of...
Plastic scintillation detectors for precision Time-of-Flight measurements of relativistic heavy ions
2017, 41(6): 066001. doi: 10.1088/1674-1137/41/6/066001
Abstract:
Plastic scintillation detectors for Time-of-Flight (TOF) measurements are almost essential for event-by-event identification of relativistic rare isotopes. In this work, a pair of plastic scintillation detectors of dimensions 50×50 ×3t mm3 and 80×100...
Plastic scintillation detectors for Time-of-Flight (TOF) measurements are almost essential for event-by-event identification of relativistic rare isotopes. In this work, a pair of plastic scintillation detectors of dimensions 50×50 ×3t mm3 and 80×100...
2017, 41(6): 066101. doi: 10.1088/1674-1137/41/6/066101
Abstract:
An ultrafast front-end ASIC chip has been developed for APD array detectors in X-ray time-resolved experiments. The chip has five channels: four complete channels and one test channel with an analog output. Each complete channel consists of a preampl...
An ultrafast front-end ASIC chip has been developed for APD array detectors in X-ray time-resolved experiments. The chip has five channels: four complete channels and one test channel with an analog output. Each complete channel consists of a preampl...
2017, 41(6): 066201. doi: 10.1088/1674-1137/41/6/066201
Abstract:
The Jiangmen Underground Neutrino Observatory (JUNO) detector is designed to determine the neutrino mass hierarchy and precisely measure oscillation parameters. The general purpose design also allows measurements of neutrinos from many terrestrial an...
The Jiangmen Underground Neutrino Observatory (JUNO) detector is designed to determine the neutrino mass hierarchy and precisely measure oscillation parameters. The general purpose design also allows measurements of neutrinos from many terrestrial an...
2017, 41(6): 067001. doi: 10.1088/1674-1137/41/6/067001
Abstract:
5-cell elliptical cavities have been selected for the main linac of the China Accelerator Driven sub-critical System (C-ADS) in the medium energy section. According to the design, each cavity should be driven with radio frequency (RF) energy up to 15...
5-cell elliptical cavities have been selected for the main linac of the China Accelerator Driven sub-critical System (C-ADS) in the medium energy section. According to the design, each cavity should be driven with radio frequency (RF) energy up to 15...
2017, 41(6): 067002. doi: 10.1088/1674-1137/41/6/067002
Abstract:
Producing high-brightness and high-charge (>100 pC) electron bunches at blowout regime requires ultrashort laser pulses with high fluence. The effects of laser pulse heating of the copper photocathode are analyzed in this paper. The electron and latt...
Producing high-brightness and high-charge (>100 pC) electron bunches at blowout regime requires ultrashort laser pulses with high fluence. The effects of laser pulse heating of the copper photocathode are analyzed in this paper. The electron and latt...
2017, 41(6): 067003. doi: 10.1088/1674-1137/41/6/067003
Abstract:
In this paper, a new type of magnet is proposed and produced to give a uniform transverse beam profile. Compared to octupole magnets, the new type of magnet can provide a similar octupole magnet field in the middle, but the rise rate declines quickly...
In this paper, a new type of magnet is proposed and produced to give a uniform transverse beam profile. Compared to octupole magnets, the new type of magnet can provide a similar octupole magnet field in the middle, but the rise rate declines quickly...
2017, 41(6): 068201. doi: 10.1088/1674-1137/41/6/068201
Abstract:
The secondary neutron fields at the deep tumor therapy terminal at HIRFL (Heavy Ion Research Facility in Lanzhou) were investigated. The distributions of neutron ambient dose equivalent were measured with a FHT762 Wendi-II neutron ambient dose equiva...
The secondary neutron fields at the deep tumor therapy terminal at HIRFL (Heavy Ion Research Facility in Lanzhou) were investigated. The distributions of neutron ambient dose equivalent were measured with a FHT762 Wendi-II neutron ambient dose equiva...
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