Short-lived Cosmic R a Y Produced Nuclides

coincidences o b s e r v e d 9 between the 3 8 1 and 6 2 0 keV y rays. The log ft value of the ß branch feeding the 1 1 4 2 keV level is 7 . 5 , whidi indicates that a spin assignment of 1 / 2 — or 3 / 2 — is likely. The K-conversion coefficient of the 1 0 0 2 keV transition determined gives an M 2 character for that transition, while the 3 8 1 keV transition is found to have M 1 + E 2 character, see the table. According to these results, the 1 1 4 2 k e V level is assigned as 3 / 2 — . A level at 1 1 7 0 k e V is introduced, since the 9 8 9 k e V y ray was found to be in coincidence with the 1 8 1 keV transition. The existence of this level fits the replacement of the weak 4 0 9 keV transition which is coincident with the 6 2 0 keV transition, in the decay scheme. The log ft value of the ß branch feeding the 1 1 7 0 k e V level suggesting a spin 1 / 2 — , 3 / 2 — or 5 / 2 — . A spin of 1 / 2 — can be excluded in view of the feeding to the 5 / 2 + , 1 8 1 keV level. Of the remaining spin values, 5 / 2 — is somewhat less p r o b a b l e 9 since the log 1 / 2 4 ( f P 0 2 — I)ft value is rather low for a unique first-forbidden ß transition. The M 1 character for the 4 0 9 keV transition may support the 3 / 2 — assignment for the 1 1 7 0 keV level. A new level at energy of 1 1 9 8 keV proposed 9 due to the coincidence relation of the 1 0 1 7 keV y ray with the 1 8 1 keV transition. The appearance of the K-conversion line of the 1 0 1 7 keV transition in the conversion spectrum confirms the existence of a level at 1 1 9 8 k e V . The study 9 of ß transition feeding the 1 1 9 8 k e V level leads to a spin assignment of 5 / 2 — .