The <sup>16</sup>O（n,γ）<sup>17</sup>O reaction is first realized at neutron energies from 7 to 14MeV,which is the so-called pygmy resonance region.The pusled beam and time offlight technique...The <sup>16</sup>O（n,γ）<sup>17</sup>O reaction is first realized at neutron energies from 7 to 14MeV,which is the so-called pygmy resonance region.The pusled beam and time offlight techniques are used.Two large NaI-plastic anticoincidence shielded spectrometersare used to detect high energy gamma rays.The results are in good agreement withthose of the <sup>17</sup>O（γ,n<sub>0</sub>）reaction by detailed balance.The integrated（γ,n<sub>0</sub>）cross section is5.88 MeV mb,which is 2.3% of energy weighted sum rule（EWSR）.展开更多
Autolytimycin 1 was isolated from the culture filtrate of Streptomyces autolyticus JX-47, together with two known compounds, lebstatin 2 and 17-O-demethyl-geldanamycin 3. These compounds showed the activities of anti-...Autolytimycin 1 was isolated from the culture filtrate of Streptomyces autolyticus JX-47, together with two known compounds, lebstatin 2 and 17-O-demethyl-geldanamycin 3. These compounds showed the activities of anti-HSV-I. The structure of 1 was determined by spectral analysis.展开更多
We justify and extend the standard model of elementary particle physics by generalizing the theory of relativity and quantum mechanics. The usual assumption that space and time are continuous implies, indeed, that it ...We justify and extend the standard model of elementary particle physics by generalizing the theory of relativity and quantum mechanics. The usual assumption that space and time are continuous implies, indeed, that it should be possible to measure arbitrarily small intervals of space and time, but we ignore if that is true or not. It is thus more realistic to consider an extremely small “quantum of length” of yet unknown value <em>a</em>. It is only required to be a universal constant for all inertial frames, like<em> c</em> and <em>h</em>. This yields a logically consistent theory and accounts for elementary particles by means of four new quantum numbers. They define “particle states” in terms of modulations of wave functions at the smallest possible scale in space-time. The resulting classification of elementary particles accounts also for dark matter. Antiparticles are redefined, without needing negative energy states and recently observed “anomalies” can be explained.展开更多
基金The project partly supported by National Natural Science Foundation of China.
文摘The <sup>16</sup>O（n,γ）<sup>17</sup>O reaction is first realized at neutron energies from 7 to 14MeV,which is the so-called pygmy resonance region.The pusled beam and time offlight techniques are used.Two large NaI-plastic anticoincidence shielded spectrometersare used to detect high energy gamma rays.The results are in good agreement withthose of the <sup>17</sup>O（γ,n<sub>0</sub>）reaction by detailed balance.The integrated（γ,n<sub>0</sub>）cross section is5.88 MeV mb,which is 2.3% of energy weighted sum rule（EWSR）.
文摘Autolytimycin 1 was isolated from the culture filtrate of Streptomyces autolyticus JX-47, together with two known compounds, lebstatin 2 and 17-O-demethyl-geldanamycin 3. These compounds showed the activities of anti-HSV-I. The structure of 1 was determined by spectral analysis.
文摘We justify and extend the standard model of elementary particle physics by generalizing the theory of relativity and quantum mechanics. The usual assumption that space and time are continuous implies, indeed, that it should be possible to measure arbitrarily small intervals of space and time, but we ignore if that is true or not. It is thus more realistic to consider an extremely small “quantum of length” of yet unknown value <em>a</em>. It is only required to be a universal constant for all inertial frames, like<em> c</em> and <em>h</em>. This yields a logically consistent theory and accounts for elementary particles by means of four new quantum numbers. They define “particle states” in terms of modulations of wave functions at the smallest possible scale in space-time. The resulting classification of elementary particles accounts also for dark matter. Antiparticles are redefined, without needing negative energy states and recently observed “anomalies” can be explained.
