Proton scattering by short lived sulfur isotopes

Thick-target inverse-kinematics proton scattering fromAr46and theN=28shell belowRiley1, Abdelqader2, Bazin3 et al. 2005Phys. Rev. CSelf Cite

“…They have not been extensively tested for very neutron-rich nuclei. However, the global potential of Bechetti and Greenlees [37] has been successfully applied in studies of neutron-rich sulfur and argon isotopes [40,41]. The Bechetti-Greenlees potential is based on proton-scattering measurements with beam energies less than 50 MeV/nucleon and is therefore unsuitable for the present work.…”

“…A deformed ground state of 44 S is indicated by β-decay studies [10,11], and the excitation strength of the 2 + 1 state of B(E2; 0 + g.s. → 2 + 1 ) = 314(88) e 2 fm 4 measured via Coulomb excitation [12] of 44 S is not significantly below those of the neighboring sulfur isotopes 40,42 S. However, in 46 Ar, the excitation strength B(E2; 0 + g.s. → 2 + 1 ) = 218(31) e 2 fm 4 of the 2 + 1 state, measured via Coulomb excitation [13], is significantly lower than that of the 2 + 1 states of the neighboring neutron-rich argon isotopes 40,42,44 Ar, all of which have values above 300 e 2 fm 4 [14,15].…”

γ-ray spectroscopy of neutron-richS40

“…The first experimental observation of the 2s 1/2 -1d 3/2 inversion was made by Bjerregaard et al [33] in 1967; in this work, states of 47 K were populated in the proton pickup reaction (t, α). From more recent studies of proton pickup reactions on the even-A isotopes of calcium, the evolution of the d 3/2 and s 1/2 proton-hole states in the potassium isotopes has been established for 20 N 28 [34,35] [12,13,[15][16][17]19,20] and the results of large-scale 0hω sd-pf shell-model calculations. Only yrast states are shown for calculations SM2 and SM3.…”

“…Excited states of 40 S have previously been studied in 40 P β decay [19], in in-beam γ -ray spectroscopy using fragmentation reactions [15][16][17], in elastic and inelastic proton scattering in inverse kinematics [20], and in intermediateenergy Coulomb excitation [12,13] [19], based mainly on nuclear structure arguments, appears to be inconsistent with the fragmentation work of Sohler et al [15]. Sohler has suggested an alternative level scheme to that proposed by Winger et al, 40 S, populated in binary grazing reactions, has been studied.…”

Hindered proton collectivity in the proton-rich nucleus [sup 28]S: Possible magic number Z = 16

“…A similar mechanism is proposed for 16 C [ [31][32][33] and 136 Te [34,35], where small B(E2) and E x (2 + 1 ) values in comparison with neighboring isotopes are observed. ratios obtained by the combinations of B(E2) and the result of (p, p ′ ) on the nuclei of interest [36]. The ratio for 28 S amounts to 1.9(2) by taking the present result and adopted B(E2) of 350(50) e 2 fm 4 for the mirror nucleus 28 Mg [28].…”