Yrast levels inTi44

Abstract

The reaction "S("N, pny)"Ti has been studied with a view to populating high spin states in ""Ti. In singles and y-y coincidence experiments y-ray transitions in the ground state band and a negative parity band are seen and three levels connected to the ground state band, at 6508, 7671, and 8040 keV, are inferred. Angular distributions are consistent with stretched cascades. The lifetime of the 7671-keV level, presumed 10+, has been determined by the attenuated Doppler-shift method to be 2.7~0.5 ps. A comparison of the present reaction with the recently reported Si(' F, p2ny) Ti reaction is made and a method for predicting the propensity of these types of reaction to feed high spin states is proposed. An (fp)' shell model calculation of yrast levels up to J 12 has been made.NUCLEAR REACTIONS 32S(~4N, Pny), E =26-43 MeV; measured y-y coin and o(E); +Ti deduced levels; measured 8'(0&), Doppler-shift attenuation; deduced J", Tf /2 Natural targets, Ge(Li) detectors.

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

“…It thus appears, that by different experimental methods the existence of a highly excited rotational band in 44Ti starting at Eex~= 11 MeV has now been established experimentally. This band is of a quasimolecular type with a very small splitting between even and odd/-values and is in this respect different from the usual rotational type bands [13,14] observed in the lower part of the 44Ti spectrum. Further investigations of the members of the quasimolecular band by resonance and transfer reactions and a detailed comparison with theoretical calculations is presently being performed.…”

Superdeformation and dynamical symmetry

“…SD structure was predicted in 40 Ca by shell model calculations in [30,31]. A candidate for a SD 8p-8h structure in 40 Ca has been identified in [14] and the features of this band are described by cranked relativistic mean field calculations. In [32] the transition quadrupole moments for the SD band in 40 Ca have been experimentally determined.…”

“…A rotational band has been identified experimentally in 40 Ar by Ideguchi et al [13]. Based on the deduced quadrupole moment, the band has been identified as a SD one.…”

“…Predictions of superdeformed (SD) bands have been given based on different theoretical models around 40 Ca and in lighter alpha-like nuclei. Some of these suggestions have already been experimentally confirmed, SD candidate bands were experimentally found in this mass region in the 2000s such as in 28 Si [11], in 36 Ar [12], in 40 Ar [13], in 40 Ca [14] and in 44 Ti [15]. The SD character of a previously found band [16] was proved in 42 Ca [17].…”

“…Its properties were characterized by cranked Hartree-Fock-Bogoliubov calculations. Description of triaxial SD states in 40 Ar including electric quadrupole transition strengths was given using AMD+GCM calculations and compared with experimental data in [29].…”