Resonances in low energy40Ca(?, ?)-scattering and quasimolecular band in44Ti

Abstract

Abstract.The elastic e-scattering from 4~ has been studied between E~=7.035 MeV and 7.405 MeV. Angular distributions and excitation functions have been measured in 5 keV steps. The data display a resonance at E~ = 7.26 MeV which by its width and angular correlation is clearly distinguished from strong Ericson fluctuations in this region. From the analysis of the angular distributions and excitation functions a spin J~ = 1-is assigned to this resonance. The resonance parameters are F~=31 keV, Ftota~= 51 keV. By its spin and excitation energy this state is interpreted as a member of a quasimolecular band in 44Ti the higher /-members of which are known from 4~ e) scattering between E~ = 18 MeV and 50MeV. The experimental data are compared with recent microscopic calculations within a fully antisymmetrized reaction theory.

Investigation of large angle structure in ?-scattering from calcium isotopes betweenE ?=36?61 MeV

“…The highest L-value obtained so far is L= 16. A 1-resonance at E~=7.26MeV which has been identified [11] in 4~ excitation function measurements lies exactly on the linear extrapolation of this curve. Recently, microscopic calculations of the 4~ system have been performed [12,13] within antisymmetrized theories.…”

Isoscalar dipole transition as a probe for asymmetric clustering

“…The α + 40 Ca cluster states in 44 Ti have also been studied by many authors [68][69][70]79,[89][90][91][92][93][94][95][96][97][98], but the situation is more complicated than the case of 20 Ne. The theoretical and experimental studies are summarized in a review paper [99], and our discussion is based on the assignment given therein.…”

Resonance spectroscopy of44Ti in the excitation energy range 9.05 to 10.28 MeV

“…The calculations of Arima, Gillet and Ginochio [13] do not predict a 0 4. quartet for 44Ti in the 9-10MeV region. A strong 0 + level is expected at about 10-11 MeV on the basis of theoretical [14] and experimental [15] evidence of a quasi-molecular band. This level does not appear in the present data; it is probably located above the energy of the experiment.…”