Ho Tso-Hsiu

A NEW METHOD FOR CALCULATING THE DOUBLE BETA-DECAY PROBABILITY

A new method of calculating decay probability is derived. It is shown that with the present knowledge of nucleon-nucleon force and reasonable nuclear wave functions for the parent and daughter nuclei this method can provide a reliable result without using closure approximation.

Silicon Purification by a New Type of Solar Furnace

We propose a new method to reveal a direct transformation from solar energy to solar electricity. Instead of using electricity in the process, we use concentrated solar rays with a crucibleless process to upgrade metallurgical silicon into solar-grade silicon feedstock.

A POSSIBLE EXPLANATION OF THE NEGATIVE VALUES OF M(NU-E)(2) OBTAINED FROM THE BETA-SPECTRUM SHAPE ANALYSES

By comparing the results obtained using the same experimental data of CIAE but different theoretical formula fits it is pointed out that the negative value of most likely stemmed from the inaccuracy of the theoretical formula of the β spectrum.

How to Determine the Nuclear Matrix Element in 2β-Decay?—A Discussion Of PCAC, 2β-Decay and Double-Charge Exchange Reaction of Pions on Nuclei

It is shown that by applying PCAC, the 2β-decay process can be directly related to double-charge-exchange reaction. Therefore, by studying double-charge-exchange reactions one is able to determine the nuclear matrix element of the relevant 2β-decay experimentally. A preliminary analysis has indicated that if the experimental data of forward-angle cross section on Ca40 with pion beam at 164 MeV[9] are used and extrapolated to Ca48, then the squared nuclear matrix element thus determined is smaller than that calculated for .

A Model of Neutrino Stellar System and the Upper Bound of Neutrino Mass Obtained from the Rotation Curves of Some Galaxies

We discuss in this paper a stellar model of degenerate massive neutrinos with a core made of heavy matter. Dimension of the core is much smaller than the scale of neutrino star. The Oppenheimer-Volkoff equation is solved for such a system. Our calculation shows that under certain conditions, this neutrino halo will resemble a pure neutrino star. We have further obtained insides the neutrino star (or halo) the rotation curve and the gravitational red shifts. It is interesting to note that the relative rotation velocity ( is the radius of the neutrino star) depends only on the relative coordinate in the nonrelativistic cases. Therefore, all nonrelativistically degenerate neutrino systems will have a universa1 relative rotation curve( versus ). Within the accuracy of numerical calculation, we have also obtained a useful relation connecting the maximum velocity and the corresponding coordinate as . By comparing this relation with the observed rotation data at large distances for some galaxies, we have obtained an upper bound for neutrino mass of about .

Is the Neutrino Mass Equal to 34 eV? --A Discussion of the Atomic Effect in the β-Decay of H3

In evaluating the β-spectrum of atomic H3 a more accurate formula is obtained, in which the first three transitions leading to the Lowest three states of 3He+ are treated exactly, and the closure approximation is used to estimate the contribution from all excited states with n>3. The formula obtained is compared with what is used by Lyubimov et al.in determining the neutrino mass. As a result it has been shown that the formula used by Lyubimov et al. does not yield an adequate accuracy. Especially the end-point energy they obtained may differ from the true value by 13.6 ev, which would cause an uncertainty of the same order in the value of the neutrino mass.

A Possible Macroscopic-Photo-Catalysis Mechanism in Solar Furnace

Based on the experimental results of Chen et al. to use the solar furnace and medium frequency induction furnace to extract boron impurity from metallurgical silicon, we propose a strong radiation catalysis mechanism to explain the difference of reaction rates in these two furnaces. The postulate assuming the photons striking on the material not only increase the thermal energy of the molecules of reactants but also lower down the energy barrier of the reaction to speed up the chemical reaction. It is believed the photon catalysis mechanism is universal in most of high temperature chemical reactions and looking forward to more evidences for the postulate proposed in this article.

Digitalized Mirror Array and Its Application in Large Telescope: Principle and Case Studies

In this article, we report the principle and conceptual design of a fundamentally different technology in fabricating high precision aberration free optical devices. The tip-tilt of facet in a mirror array is produced by digitally controlled line-tilts of rows and columns. It has not only provided a cost-effective designing methodology in optical physics but also led to a much finer precision of 1 mili arc sec or less. As examples of the application of the proposed digitalised optics, two case studies have been given: a 10 m Schmidt telescope (off-axis) and an 8 m Cassegrain telescope (on-axis).

Realization of Tip Tilting By 8-Step Line Tilting

By direct calculation of rotation matrices of SO(3), we show how certain specific sequence of eight consecutive rotations of digital angles can yield a tilting of a facet mirror. We also design a detailed program specifically to tilt an array of mirrors from planar orientation to the required focusing orientation. We describe how to use the 8-step to realize the focusing of the mirror array. We have found, in our designed program, an important feature of row-sharing during the rotations for the columns and similarly the column-sharing during the rotations for the row. This feature can save a lot of operating time during the actual realization of the mechanical movements.

Pion double-charge-exchange on calcium isotopes

We examine the contributions of the conventional sequential mechanism and the pion absorption-emission mechanism for the double charge exchange (DCX) on calcium isotopes. It is shown that by combining these two mechanisms the experimental data for the double isobaric analogue transitions can be reproduced quite well. The predictions for the low energy GS --> GS DCX on calcium isotopes are presented.