Thirteen new resonances in the 15N(p,y)lgF reaction have been discovered in the region Em = 600-3150 keV. y-Decay schemes and radiative yields are reported for several of them. Spins and parities for 10 levels in 19F are also reported.
A weak resonance at 850 keV in 15N(a,y)19F corresponding to a level at 4681 f 1 keV in I9F has been found. Angular distributions and Doppler shifts have been measured for the primary decays to the 512-level at 1.35 MeV (63%), 312-level at 1.46 MeV (31%). and the 5/2+ level at 197 keV (6%). A spin of 512 has been assigned to the resonance level and negative parity is shown to be very likely. The lifetime of the resonance was measured by the Doppler shift attenuation method to be T = (15.4 f 3.0) x 10-l5 s or r = 42.8 + 8.5 meV. The measured value of my was 6.0 + 1.0 meV. These measurements together with previous -information on r , / r imply the observed MI transition strengths are a factor of 20 weaker than predicted for the 512 member of the K = 312-band in I9F which has previously been associated with this level. Une faible resonance a 850 keV dans 15N(a,y)LgF correspondant a un niveau a 4681 + I keV dans le IyF a ete trouvee. Les distributions angulaires et les effets Doppler ont Cte mesures pour les desintegrations primaires vers le niveau 512-a 1.35 MeV (63%), le niveau 312-a 1.46 MeV (31 %) et le niveau 5/2+ a 197 keV (6%).Un spin 512 a it6 attribuC au niveau de resonance et on montre qu'une parite negative est tris probable. La vie rnoyenne de la resonance a ete evaluk par la methode de I'atttnuation de I'effet Doppler a r = (15.4 f 3.0) x 10-l5 sou r = 42.8 + 8.5 MeV. La valeur rnesuree de wy est 6.0 + 1.0 meV. Ces mesures ainsi que I'inforrnation anterieurs sur T,/T irnpliquent que les forces de transition M1 observees sont plus faibles par un facteur 20 que celles predites pour le rnernbre 512 de la bande K = 312-dans le "F qui a ete anterieurement associe a ce niveau.
The problem of making resolution corrections in the scintillation spectrometry of continuous X rays is discussed. Analytical solutions are given to the integral equation which describes the effect of the statistical spread in pulse height. The practical necessity of making some kind of numerical analysis is pointed out. Difficulties with numerical methods arise from the fact that the observed pulse-height distribution cannot be defined precisely. As a result it is possible in practice only to find smooth "solutions". Additional difficulties arise if the numerical method is based on an invalid analytical procedure. For example matrix inversion is of doubtful value in making the resolution correction because there does not appear to be an inverse kernel for the integral equation in question.
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