Spectroscopy of the T=3/2 A=47 and A=45 mirror nuclei via one- and two nucleon knockout reactions

The charge-dependent interaction between nucleons can be explored and exploited using the analogue states identified in mirror nuclei. A cascade of excited states was established for the first time in the Tz = −3/2 proton-rich nuclei, 47Mn (Z = 25, N = 22) and 45Cr (Z = 24, N = 21), using an in-beam gamma-ray spectroscopy experiment. The observed states in the proton-rich nuclei were compared to their well-studied Tz = +3/2 mirror nuclei, 47Ti (Z = 22, N = 25) and 45Sc (Z = 21, N = 24), respectively. Analogue one- and two-nucleon knockout reactions were exploited using the 48Mn/48V and 47Cr/47V incoming secondary beams to populate states in 47Mn/47Ti and 45Cr/45Sc, respectively. New level schemes of the proton rich 47Mn and 45Cr nuclei were established using mirror symmetry arguments and gamma-gamma coincidence analysis. The inclusive and exclusive knockout cross sections in the A = 47 mirror pair have been measured for the observed populated states and were compared to reaction model calculations. Large differences between the cross sections of both mirror reactions were found to result from the large binding-energy differences between both nuclei. Large-scale shell-model calculations and an in-development density-functional approach, using the no-core configuration-interaction (DFT-NCCI) method, were deployed to study the mirror energy differences (MED) between the isobaric T = 3/2 states for the 47Mn/47Ti and 45Cr/45Sc mirror pairs. The inclusion of the isospin-breaking terms provides a stringent test of the model prescriptions due to the active presence of the fp- and sd-orbitals and, for the case of 45Cr, the spherical and deformed states that co-exist near the ground state. Lastly, the mean lifetimes of the first excited 7/2− yrast states in the A = 47 nuclei were measured using the gamma-ray lineshape method. The mean lifetime of the yrast 7/2− states in 47Ti and 47Mn were found to be t=331(15) ps and t=687(36) ps, respectively. As these two mirror transitions are almost-pure M1 transitions, a high-precision comparison of the mirrored B(M1) strengths were performed, resulting in identical transition strengths to a precision of 10%

Preliminary Comparison of the Effectiveness of the Boltzmann-Gibbs Blast Wave-Model with the Tsallis Blast-Wave Model of pp Collisions at 7 TeV

The comparison between the Boltzmann-Gibbs Blast-Wave and the Tsallis Blast-Wave models were conducted to analyse the effectiveness in analysis for each model. In this paper, the proton - proton collisions at 7 TeV were studied for three species produced that were the pions, kaons and protons. Extensive data analysis was carried out utilising C++. The radial flow velocity, $\beta$, was kept constant at 4.387$\times$10$^{-1}$ within a fixed range of limits especially for the Boltzmann-Gibbs Blast-Wave model. It was found that the Tsallis Blast-Wave model would be more effective compared to the Boltzmann-Gibbs Blast-Wave model if the correct choice of limits for the parameters were taken as well as the range of data plotted

Search for Weak Side Branches in the Electromagnetic Decay Paths of the 6526-keV 10+ Isomer in 54Fe

High-spin nuclear isomers in (Formula presented.) nuclei between doubly magic (Formula presented.) Ca and (Formula presented.) Ni provide an excellent testing ground for the nuclear shell model and questions related to isospin symmetry breaking in the vicinity of the proton drip line. The purpose of the present study is to investigate the possibility of weak electromagnetic decay branches along the decay paths of the 6526-keV (Formula presented.) isomer in (Formula presented.) Fe. The isomer was strongly populated by means of the fusion-evaporation reaction (Formula presented.) Mg((Formula presented.) Ar, (Formula presented.)) (Formula presented.) Fe. The Gammasphere array was used to detect (Formula presented.) -ray cascades emitted from the isomeric state. By means of (Formula presented.) coincidences, weak non-yrast decay branches can be discriminated, with the isomer’s half-life confirmed at (Formula presented.) ns. The yrast (Formula presented.)   (Formula presented.) cross-over transition was interrogated. The observations are compared with shell-model calculations