Étude de la diffusion inélastique de particules alpha de 44,4 MeV sur 58Ni, 60Ni, 64Ni

Level Structure ofNi64

“…4 On this basis, we suggest a spin and parity assignment of 3~ for this level. This Q value for the collective 3~ state is in disagreement with the value of -3.8 MeV found from (a,a') scattering by Beurtey et al 5 Analysis 6 of the angular distributions from the levels numbered 2, 3, and 4 on the basis of the vibrational model identifies them as being the two-phonon triplet having spins of 0 + , 4 + , and 2 + , respectively.…”

Alpha-Particle Reaction Cross Sections at 40 MeV

“…The correction <n n is due to several sources. The first is the correction due to (a,a') direct-interaction events [5][6][7][8][9] (evaporation-spectrum alpha particles will stop in the absorber). The correction due to (a,p) events has been obtained using the Nuclear Monte Carlo Evaporation Model (NMCEM).…”

“…The raw cross section a, the counter-3 scattering-out correction 773, the inelastic and reaction scattering correction <xi Q (Ref [5][6][7][8][9][10][11][12][13][14][15]…”

Particle Model of Scattering from Collective States of Nuclei

“…In the dilute quasi-particle approximation the terms in 77 are dropped, so that the neglect of these terms introduces errors of the same order as the use of the commutation rules (9). For this reason, for the study of the excitation of the second vibrational state it is necessary to use the correct commutation rules.…”

“…The empirical differential cross sections for the scattering of medium energy nuclear particles, especially alpha particles, show strong oscillations, in which often the maxima and minima occur at regular intervals in the scattering. 9 Theoretical cross sections with such a general shape have been derived by a diffraction model for scattering of particles from a nonspherical strongly-absorbing nucleus; this model was introduced by Drozdov, 10 extended by Inopin 11 to allow the introduction of collective coordinates for the excitation of quadrupole vibrational states, and further developed by Blair 12 to allow any type of surface phonon. Blair has emphasized the necessity to understand the inelastic and elastic scattering in terms of the same mechanism, and has demonstrated that certain qualitative relationships which have been found between the experimental elastic and inelastic cross sections can be derived by means of this model.…”