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- W2078245469 abstract "Abstract We describe a mass spectrometer which, used on-line with the extracted beam of an accelerator, allows the measurement of isotopic ratios of even the very short-lived nuclides ( T ⪡1 sec ) produced in nuclear reactions. One can thus measure independent formation cross sections of nuclides far from stability and also identify new isotopes. A target, heated to a temperature of about 1500°C is bombarded by a high energy proton beam. The target is made of a stack of metal and graphite slabs so that the energetic recoils, originating in the target, are stopped in the graphite catchers from where they will diffuse out easily. By surface ionization, alkali atoms are then specifically ionized and the ions accelerated and analyzed by a conventional magnetic sector Nier type mass spectrometer. Detection at the collector is achieved by a secondary electron multiplier delivering a voltage pulse for each ion impinging on its first dynode. The apparatus is described (reaction chamber, vacuum system, ion detection and counting equipment etc…); it is a mobile type of installation and can be set in few hours in the beam of an accelerator. The confection of the target is the most delicate part of the technique, and examples are given of applications to various problems of spallation, fission and fragmentation reactions. The sensitivity of the method to very small cross sections and also to very short half lives is discussed. The efficiency has been estimated in a few instances and cross sections of the order of 10 μb can be measured accurately. Radioactive decay during diffusion will limit the half lives of the nuclides that can possibly be studied. Diffusion phenomena in the target have been analyzed and a procedure is described to correct cross sections for this decay. Measurements have been made on several nuclides with half-lives of the order of 0.2 sec but nuclides of much shorter half-lives (a few tens of msec) could be detected. Applications of the method are discussed in the last section and include measurement of cross sections, identification of isotopes far from stability produced in complex nuclear reactions and also production of separated beams of short lived isotopes for nuclear spectrometric studies." @default.
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- W2078245469 date "1967-07-01" @default.
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- W2078245469 title "Spectrometre de masse en ligne pour l'etude d'isotopes de tres courtes periodes produits par reactions nucleaires" @default.
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- W2078245469 doi "https://doi.org/10.1016/0029-554x(67)91358-4" @default.
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