Der Zerfall von Mo⁹¹ und Mo^91m

Abstract

InhaltsiibersichtDie beim Zerfall von Mo91 und Mo91m emittierte y-Strahlung wurde mit einem Szintillationsspektrometer und einer zweidimensionalen Koinzidenzapparatur untersucht. Drei neue y-Linien rnit den Energien 800, 1040 und 1600 keV, die mit der 511 keV-Annihilationsstrahlung koinzidieren. sind dem Zerfall von Mo9l zugeordnet worden. Die Halbwertszeit von Mo91 wurde zu T,lz = (15,7 & 0,2) min bestimmt. Die Untersuchung des Zprfalls von Mo91m ergab das bereits bekannte y-Spektrum. Die relativen Intensitaten der y-Linien wurden bestimmt. Fur die Halbwertszeit von Mo91m ergab sich T,,, = (68 2) s. Das experimentelle Niveauschema von Nbgl wird mit der Theorie verglichen.

The radioactive decay of 190Re and isomer ratio measurements in photonuclear reactions

“…t h e h a l f -l i v e s of t h e n u c l e a r s t a t e s were r e l a t i v e l y s h o r t (1 min t o 2.5 h r ) (41,42,44). I n t h e s e cases t h e 9 .…”

The radioactive decay of 190Re and isomer ratio measurements in photonuclear reactions

“…The flux monitor foils were small disks of high purity copper metal approximately 3 mm in diameter eind 1 mm thick. These foils were weighed prior to For three of the systems studied (^^Mo, and ^^^Nd) the half-lives of the nuclear states were relatively short (1 min to 2.5 hr) (41,42,44). In these cases the 9.9 min ^^Cu activity of the monitor foils was used for the dose …”

The radioactive decay of 190Re and isomer ratio measurements in photonuclear reactions

“…The flux monitor foils were small disks of high purity copper metal approximately 3 mm in diameter eind 1 mm thick. These foils were weighed prior to For three of the systems studied (^^Mo, and ^^^Nd) the half-lives of the nuclear states were relatively short (1 min to 2.5 hr) (41,42,44). In these cases the 9.9 min ^^Cu activity of the monitor foils was used for the dose Trial calculations were made in which slight changes in these two parameters were Included, Large variations in the calculated isomer ratio occurred when this procedure was tried.…”