A search for excited states of 3He by the reaction 7Li(d,6He)3He

At deuteron energy of 37 MeV the 6 He inclusive spectra are measured in the exit channel of reaction 7 Li(d,6 He)3 He. The resonance-like structure of spectra in the range of 6 He energies corresponding to the excitation of 3 He recoil nuclei in the range of E* = 6…16 MeV was observed. The experimental data can be described in assumption of existence of 3 He resonances with excitation energies of Е* = 9, 13 and 16 МеV. An analysis of the experimental spectra shows that observed structure of 6 He spectra can be as well explained by the more probable processes of excitation and decay of 7 Li and 7 He unbound states in accompanied reaction channels

Температурная коррекция широкополосных детекторов мощности на основе низкобарьерных диодов

The article is devoted to investigation of microwave power converter temperature dependence caused by changes in the current-voltage characteristic of diodes. The analytical expressions are given for such diode parameters as junction resistance and diode saturation current that allow to estimate temperature influence on diode detector output voltage. This paper presents a comparison of two methods, i.e. correlation based on a terminological method that works in con-junction with an arithmetic-logical mechanism. The first method implies that the temperature stabilizes by use of identical pair of diodes one of which compensates for temperature-induced changes of the second diode junction resistance. The second method involves formation of correction factors that allow performing temperature correction of measurement results in a wide range of capacities. Based on the conducted temperature tests of microwave power meters with the use of a temperature sensor in the microwave unit, the thermal correction algorithm was implemented. It allows to reduce the changes in the readings from ±15 to ±1.5%. Data from the results of experimental studies that can be used in measuring microwave equipment of various types. The results of experimental studies of detectors based on low-barrier diodes ZB-28 with a boundary speed exceeding 100 GHz and a tangential sensitivity of 1 nW are presented.Исследуется температурная зависимость сверхвысокочастотных преобразователей мощности. Приведены аналитические выражения сопротивления перехода и тока насыщения диода, позволяющие оценить степень влияния температуры на выходное напряжение диодных детекторов. Выполнено сравнение двух способов температурной коррекции. Известный способ заключается в достижении температурной стабилизации за счет использования идентичной пары диодов, один из которых компенсирует изменение сопротивления перехода второго диода при изменении температуры. В настоящей статье предложен альтернативный способ, заключающийся в формировании поправочных коэффициентов, позволяющих проводить температурную коррекцию результатов измерений в широком диапазоне мощностей. Представлены результаты экспериментальных исследований детекторов на основе низкобарьерных диодов ZB-28 с граничной частотой свыше 100 ГГц и тангенциальной чувствительностью 1 нВт. На основе температурных испытаний измерителей мощности СВЧ с использованием термодатчика реализован алгоритм термокоррекции, позволивший уменьшить изменение мощности с ±15 до ±1.5 %. Полученные результаты свидетельствуют о том, что предложенный способ температурной коррекции широкополосных детекторов мощности с использованием показаний термодатчиков может успешно применяться в измерительном СВЧ-оборудовании различного типа

Temperature Correction of Broadband Power Detectors Based on Low-Barrier Diodes

The article is devoted to investigation of microwave power converter temperature dependence caused by changes in the current-voltage characteristic of diodes. The analytical expressions are given for such diode parameters as junction resistance and diode saturation current that allow to estimate temperature influence on diode detector output voltage. This paper presents a comparison of two methods, i.e. correlation based on a terminological method that works in con-junction with an arithmetic-logical mechanism. The first method implies that the temperature stabilizes by use of identical pair of diodes one of which compensates for temperature-induced changes of the second diode junction resistance. The second method involves formation of correction factors that allow performing temperature correction of measurement results in a wide range of capacities. Based on the conducted temperature tests of microwave power meters with the use of a temperature sensor in the microwave unit, the thermal correction algorithm was implemented. It allows to reduce the changes in the readings from ±15 to ±1.5%. Data from the results of experimental studies that can be used in measuring microwave equipment of various types. The results of experimental studies of detectors based on low-barrier diodes ZB-28 with a boundary speed exceeding 100 GHz and a tangential sensitivity of 1 nW are presented