The K+K and K~K~ systems centrally produced in the reaction pp~p~KKp~ have been studied at 300 Ge... more The K+K and K~K~ systems centrally produced in the reaction pp~p~KKp~ have been studied at 300 GeV/c incident momentum. Both the K+K -and the K°K ° mass spectra show large resonant production. For the first time in hadron collisions, clear evidence is found for the 0/~ (1720) with parameters m = 1713 + 10 MeV, F= 181 _+ 30 MeV for the K ~K-decay mode and m= 1706_+ 10 MeV, F= 104_+ 30 MeV for the K°K~ decay mode. A spin analysis of the K+K spectrum shows that for the 0/f~(1720) j/,= 2 + is strongly favoured while 0 * and 1 are excluded.
International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements, 1992
Ah&net-The long duration exposure facility (LDEF), launched into a 258 nautical mile orbit with a... more Ah&net-The long duration exposure facility (LDEF), launched into a 258 nautical mile orbit with an inclination of 28.5". remained in soace for nearly 6 vr. The 21,500 lb NASA satellite was one of the lamest payloads ever deployed by the Space Shuttle. LDEF completed 32,422 orbits and carried 57 Gjor experiments representing more than 200 investigators from 33 private companies, 21 universities and nine countries. The experiments covered a wide range of disciplines including basic science, electronics, optics, materials, structures and power and propulsion. A number of the experiments were specifically designed to measure the radiation environment. These experiments are of specific interest, since the LDEF orbit is essentially the same as that of the Space Station Freedom. Consequently, the radiation measurements on LDEF will play a significant role in the design of radiation shielding of the space station. The contributions of the various authors presented here attempt to predict the major aspects of the radiation exposure received by the various LDEF experiments and therefore should be helpful to investigators who are in the process of analyzing experiments which may have been affected by exposure to ionizing radiation. The paper discusses the various types and sources of ionizing radiation including cosmic rays, trapped particles (both protons and electrons) and secondary particles (including neutrons, spallation products and high-LET recoils), as well as doses and LET spectra as a function of shielding. Projections of the induced radioactivity of LDEF are also discussed. 75 78 85 a9 91 95 96 98 98 CONTENTS E. V. BENTON ef al. LDEF lifetime prediiiofl (NOAA solar data: 12/13/89 NORAD; CD = 2.06) [JSC invariant elements] 240-210-Altitude = 190.1
International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements, 1992
Predictions of the induced radioactivity in representative structural materials (aluminum and sta... more Predictions of the induced radioactivity in representative structural materials (aluminum and stainless steel) have been made for spacecraft in low Earth orbit (LEO) with emphasis on determining the importance of different space radiation sources, secondary particle contributions, and the spatial dependence expected within spacecraft. Orbit parameters corresponding to those of the recently recovered long duration exposure facility (LDEF) satellite are used, which are also very similar to the orbit parameters planned for Space Station Freedom.
Some early results are summarized from a program under way to utilize LDEF satellite data for eva... more Some early results are summarized from a program under way to utilize LDEF satellite data for evaluating and improving current models of the space radiation environment in low Earth orbit. Reported here are predictions and comparisons with some of the LDEF dose and induced radioactivity data, which are used to check the accuracy of current models describing the magnitude and directionality of the trapped proton environment. Preliminary findings are that the environment models underestimate both dose and activation from trapped protons by a factor of about two, and the observed anisotropy is higher than predicted.
The K+K and K~K~ systems centrally produced in the reaction pp~p~KKp~ have been studied at 300 Ge... more The K+K and K~K~ systems centrally produced in the reaction pp~p~KKp~ have been studied at 300 GeV/c incident momentum. Both the K+K -and the K°K ° mass spectra show large resonant production. For the first time in hadron collisions, clear evidence is found for the 0/~ (1720) with parameters m = 1713 + 10 MeV, F= 181 _+ 30 MeV for the K ~K-decay mode and m= 1706_+ 10 MeV, F= 104_+ 30 MeV for the K°K~ decay mode. A spin analysis of the K+K spectrum shows that for the 0/f~(1720) j/,= 2 + is strongly favoured while 0 * and 1 are excluded.
International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements, 1992
Ah&net-The long duration exposure facility (LDEF), launched into a 258 nautical mile orbit with a... more Ah&net-The long duration exposure facility (LDEF), launched into a 258 nautical mile orbit with an inclination of 28.5". remained in soace for nearly 6 vr. The 21,500 lb NASA satellite was one of the lamest payloads ever deployed by the Space Shuttle. LDEF completed 32,422 orbits and carried 57 Gjor experiments representing more than 200 investigators from 33 private companies, 21 universities and nine countries. The experiments covered a wide range of disciplines including basic science, electronics, optics, materials, structures and power and propulsion. A number of the experiments were specifically designed to measure the radiation environment. These experiments are of specific interest, since the LDEF orbit is essentially the same as that of the Space Station Freedom. Consequently, the radiation measurements on LDEF will play a significant role in the design of radiation shielding of the space station. The contributions of the various authors presented here attempt to predict the major aspects of the radiation exposure received by the various LDEF experiments and therefore should be helpful to investigators who are in the process of analyzing experiments which may have been affected by exposure to ionizing radiation. The paper discusses the various types and sources of ionizing radiation including cosmic rays, trapped particles (both protons and electrons) and secondary particles (including neutrons, spallation products and high-LET recoils), as well as doses and LET spectra as a function of shielding. Projections of the induced radioactivity of LDEF are also discussed. 75 78 85 a9 91 95 96 98 98 CONTENTS E. V. BENTON ef al. LDEF lifetime prediiiofl (NOAA solar data: 12/13/89 NORAD; CD = 2.06) [JSC invariant elements] 240-210-Altitude = 190.1
International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements, 1992
Predictions of the induced radioactivity in representative structural materials (aluminum and sta... more Predictions of the induced radioactivity in representative structural materials (aluminum and stainless steel) have been made for spacecraft in low Earth orbit (LEO) with emphasis on determining the importance of different space radiation sources, secondary particle contributions, and the spatial dependence expected within spacecraft. Orbit parameters corresponding to those of the recently recovered long duration exposure facility (LDEF) satellite are used, which are also very similar to the orbit parameters planned for Space Station Freedom.
Some early results are summarized from a program under way to utilize LDEF satellite data for eva... more Some early results are summarized from a program under way to utilize LDEF satellite data for evaluating and improving current models of the space radiation environment in low Earth orbit. Reported here are predictions and comparisons with some of the LDEF dose and induced radioactivity data, which are used to check the accuracy of current models describing the magnitude and directionality of the trapped proton environment. Preliminary findings are that the environment models underestimate both dose and activation from trapped protons by a factor of about two, and the observed anisotropy is higher than predicted.
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