The capture 'Y rays from the broad 53-keV and the narrow 35-keV p-wave neutron resonances of 23 Na were measured using a large anti-Compton HPGe "(-ray spectrometer. A neutron time-of-flight method was adopted with a 1.5-ns wide pulsed-neutron source by the 7 Li(p, n)7Be reaction. The standard capture cross sections of 197 Au and a pulse-height weighting technique were employed to det~rmine the number of neutrons incident on a capture sample. The numbers of observed primary "(-ray transitions were 15 and 13 for the 53-and 35-ke V resonances, respectively. The partial capture kernels and the partial radiative widths corresponding to these transitions were derived for the first time. The total radiative widths of these resonances were also derived. The present results are compared with measurements by other authors and evaluations. Moreover, a new 4,909-keV state in 24 Na was found and its spin and branching ratio were determined from the analysis of the "(-ray transitions from the narrow 35-keV resonance.
The capture 'Y rays from the broad 53-keV and the narrow 35-keV p-wave neutron resonances of 23 Na were measured using a large anti-Compton HPGe "(-ray spectrometer. A neutron time-of-flight method was adopted with a 1.5-ns wide pulsed-neutron source by the 7 Li(p, n)7Be reaction. The standard capture cross sections of 197 Au and a pulse-height weighting technique were employed to det~rmine the number of neutrons incident on a capture sample. The numbers of observed primary "(-ray transitions were 15 and 13 for the 53-and 35-ke V resonances, respectively. The partial capture kernels and the partial radiative widths corresponding to these transitions were derived for the first time. The total radiative widths of these resonances were also derived. The present results are compared with measurements by other authors and evaluations. Moreover, a new 4,909-keV state in 24 Na was found and its spin and branching ratio were determined from the analysis of the "(-ray transitions from the narrow 35-keV resonance.
Articles you may be interested inCross sections and rate constants for OH + H2 reaction on three different potential energy surfaces for rovibrationally excited reagents Potential energy surface for a seven-atom reaction. Thermal rate constants and kinetic isotope effects for CH 4 +OH The scaling relation for the classical rate constants on the scaled potential-energy surfaces has been derived using the scaling theorem in classical dynamics reported previously. This applies to the classical rate constants, both for unimolecular and for bimolecular reactions, that can be obtained by the classical trajectory method and the transition state theory. Validity of the theory has been tested for the prototype reactions, H 2 CO→H 2 ϩCO and ClϩH 2 →HClϩH. Exact scaling of the rate constants obtained by the classical trajectory calculations has been demonstrated. The rate-energy relations for the former reaction calculated with the statistical Rice-Ramsperger-Kassel-Marcus theory also displayed excellent scaling in the high-energy limit. The scaling relation does not hold rigorously near the reaction threshold due to the quantum mechanical zero-point energy effect. Regardless, the order of magnitude prediction of the threshold rate constant by scaling was possible even in extreme cases. The present method may allow reliable prediction of the classical rate constant by using potential energy data obtained at moderately high levels of electronic structure calculation.
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