Quantum numbers of 26 Al levels above 6 MeV excitation energy

28Si(p,3He) reaction for spectroscopy ofChipps1, Bardayan2, Chae3 et al. 2012Phys. Rev. C15060View full textAdd to dashboardCite

“…The (5,6) + assignment for the level at 7921 keV, based on two 25 Mg(p,γ) spectroscopy measurements [31,32], is not immediately compatible with the assignment of ℓ = (1, 2) from this work. However, ℓ ≥ 4 could not be ruled out due to a lack of telling features in the measured angular distribution, such that further constraint on the spin and parity assignment by this work was not possible.…”

“…However, ℓ ≥ 4 could not be ruled out due to a lack of telling features in the measured angular distribution, such that further constraint on the spin and parity assignment by this work was not possible. The 8602 keV level was best reproduced by ℓ = 1 transfer, which disagrees with the previous tentative (5,6) + assignment [32]. Neither transitions with greater than ℓ = 3 nor multi-step reaction processes were considered, however, meaning that a (5,6) + assignment for this state cannot be completely ruled out.…”

The structure of 32S II. Shell model interpretation

“…Their influence is only felt in the spectrum of I π = 0 + , T = 0 levels above 9.5 MeV. Apart from this fact shell-model calculations within the untruncated s-d basis space are able to reproduce the complete spectrum of positiveparity states in 32 S with an rms deviation of 200 keV, which is the accuracy previously observed [3][4][5][6][7][8][9] in the A = 21 − 28 region. The experimental-theoretical agreement is not confined to levels on or near the yrast line, which have in part been used to adjust [2] the matrix elements of the residual interaction.…”

“…The latter one is introduced with the goal of obtaining a universal Hamiltonian which can describe all nuclides of the shell at a comparable level of accuracy. Extensive tests of model predictions have been performed for a series of nuclides between A = 21 and A = 28 [3][4][5][6][7][8][9] yielding excellent agreement with experimental data over unprecedentedly large ranges of excitation energy. The favourable experimental situation which is now achieved for 32 S allows an extension of our tests to a nucleus in the upper half of the s-d shell where new matrix elements of the residual interaction come into play.…”

“…The calculations of these quantities were performed using freenucleon g-factors and effective charges of 1.35 e p for the proton and 0.35 e p for the neutron, as was the case in preceding studies [3][4][5][6][7][8][9] of the lighter s-d shell nuclei. The γ-decay of T = 0 states is essentially due to isoscalar E2 transitions.…”