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1.
In this paper, three hotly discussed problems, namely the neutrino bursts, the blue progenitor, and the mixing phenomenon, observed in SN1987A are summarized. But it is pointed that while all the observations on SN1987A do not favour a twice-banged scenario, we have found three historical cases from ancient Chinese documents that might be interpreted as twice- or even multi-explosions of a supernova. Finally in a one-dimensional simulation we demonstrate that an induced gravitational collapse b possible. 相似文献
2.
It is shown that in the pion induced double charge exchange reaction on Jp=O+→O+ nuclei,there exists a possible new reaction mechanism π+(Δ0,Δ++)π- or π+(Δ-,Δ+)π- in so-called single step process,while that old speculative mechanism π+(N,Δ)π- or π+(N,Δ)π- is firbidden by a well-known selection rule which has been indicated in the theory of the nuclear 2β-decay. 相似文献
3.
It is found that owing to the large energy difference in K-and L-shells of the daughter atom, 158Tb is not the best candidate for neutrino "balance". Instead, l57Tb can offer a better chance for. neutrino mass determination if the Q-value 55 far obtained is verified. If it is so,then the relevant atomic calculation with high precision is very necessary. It is shown that to include the radiative correction in the Hartree-Fock calculation is very important for such atoms as 157Gd and 157Tb. 相似文献
4.
APPROXIMATE B.S. WAVE FUNCTIONS FOR AN ELECTROMAGNETIC BOUND SYSTEM OF SPINS (1/2, 1/2) OR (1/2, 1/2) WITH UNEQUAL MASSES
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The Bethe-Salpeter equation for an electromagnetic bound system of spins (1/2—1/2) or (1/2—1/2) with unequal masses are solved in this paper. The approximate B.S. wave functions for these systems are given. Utilising these wave functions, the decay rate and branching ratio for Ξ0→(Σ+μ-)+vμ are calculated with accuracy up to order O(α). The results are wΞ0→(Σ+μ-)+vμ1.12(1/sec) and R=[wΞ0→(Σ+μ-)+vμ]/[wΞ0→(Σ+μ-)+vμ]4.7×10-7. Similarly, the process Λ→(pμ-)+vμ is also discussed. 相似文献
5.
We point out that although the neutrino mass is finite,the left-handed neutrino density still dominates over the righthanded one in the universe unless there exists one or more elementary fernions (quark or lepton) whose mass is larger than 106 GeV. or MWR/MWL≤102. (MWLand MWR are the left and right handed intermediate boson respectively.If there exists neutrino the mass of which is about 34 ev. as indicated in some experiments, then one can conclude that the total neutrino mass of the universe s,bvld contribute abput 99%. to the whole masses and lead to the closeness of the universe.This conclusion can be brought to the agreement of all observation datd which have been-obtained so far. A mass limit of all species of neutrinos obtained by reexamining all data is ≤ 200 eV. 相似文献
6.
The cross sections of
Ω+Ω→(ΩΩ)Jπ=0++X
are studied by using an effective Hamiltonian method. The results
are σΩ+Ω→(ΩΩ)0++γ=0.03~0.16×10-29 cm2 for
pΩ=100~400 MeV, and
the cross sections of η production are about 10-28 cm2 for
pΩ > 880 MeV. 相似文献
7.
Wai-Ki Ching † Michael K. Ng 《International Journal of Mathematical Education in Science & Technology》2013,44(2):296-299
Hidden Markov models (HMMs) are widely used in bioinformatics, speech recognition and many other areas. This note presents HMMs via the framework of classical Markov chain models. A simple example is given to illustrate the model. An estimation method for the transition probabilities of the hidden states is also discussed. 相似文献
8.
In this paper, we consider backward errors in the eigenproblem of symmetric centrosymmetric and symmetric skew-centrosymmetric matrices. By making use of the properties of symmetric centrosymmetric and symmetric skew-centrosymmetric matrices, we derive explicit formulae for the backward errors of approximate eigenpairs. 相似文献
9.
We report the synthesis, characterization, and photophysical and electrochemical properties of a series of luminescent rhenium(I) diimine indole complexes, [Re(N-N)(CO)3(L)](CF3SO3) (N-N = 3,4,7,8-tetramethyl-1,10-phenanthroline (Me4-phen), L = N-(3-pyridoyl)tryptamine (py-3-CONHC2H4-indole) (1a), N-[N-(3-pyridoyl)-6-aminohexanoyl]tryptamine, (py-3-CONHC5H10CONHC2H4-indole) (1b); N-N = 1,10-phenanthroline (phen), L = py-3-CONHC2H4-indole (2a), py-3-CONHC5H10CONHC2H4-indole (2b); N-N = 2,9-dimethyl-1,10-phenanthroline (Me2-phen), L = py-3-CONHC2H4-indole (3a), py-3-CONHC5H10CONHC2H4-indole (3b); N-N = 4,7-diphenyl-1,10-phenanthroline (Ph2-phen), L = py-3-CONHC2H4-indole (4a), py-3-CONHC5H10CONHC2H4-indole (4b)), and their indole-free counterparts, [Re(N-N)(CO)3(py-3-CONH-Et)](CF3SO3) (py-3-CONH-Et = N-ethyl-(3-pyridyl)formamide; N-N = Me4-phen (1c), phen (2c), Me2-phen (3c), Ph2-phen (4c)). The X-ray crystal structure of complex 3a has also been investigated. Upon irradiation, most of the complexes exhibited triplet metal-to-ligand charge-transfer (3MLCT) (d pi(Re) --> pi*(diimine)) emission in fluid solutions at 298 K and in low-temperature glass. However, the structural features and long emission lifetimes of the Me4-phen complexes in solutions at room temperature suggest that the excited state of these complexes exhibited substantial triplet intraligand (3IL) (pi --> pi*) (Me4-phen) character. The binding interactions of these complexes to indole-binding proteins including bovine serum albumin and tryptophanase have been examined. 相似文献
10.
X.R. WU M. Hirsch A. Staudt H.V. Klapdor-Kleingrothaus Cheng-Rui CHING Tso-Hsiu HO 《理论物理通讯》1993,20(4):453-460
The half-lives for 2νββ decay for all the potential Pp-emitters with A≥70 are calculated by the operator expansion method. Compared with the directly measured half-lives of 76Ge, 82Se, 100Mo and 238U the theoretical values are in excellent agreement with experimental ones. 相似文献