A study of the 30Si(d,p)31Si reaction

Evolution of single-particle structure of silicon isotopes

“…The difference between N nlj (6) for 1f 7/2 and 2p 3/2 states equals 0.55 in 42 Si. The reduction of particle-hole gap indicates the weakening of shell effects as the nucleus approaches the neutron drip line [65] and agrees with the measurements of one-neutron knockout reaction from 36,38,40 Si, which specify substantial neutron excitation across the N = 28 gap [66]. The resulting 1.5 MeV gap is comparable with the difference of the neutron separation energies (S n (N = 28, Z = 14) − S n (N = 29, Z = 14)) = 2.1 MeV [34].…”

“…Total pickup spectroscopic strength G − sd value for the 1d2s shell should reveal the possible total number of protons or neutrons N p for the corresponding isotope 30 Si from one-nucleon transfer reaction, adopted in the joint numerical analysis. The spectroscopic strengths G nlj for a) pickup of neutron [37] and proton [31] and b) stripping of neutron [36] and proton [35].…”

Cross-shell excitations inSi31

“…Prior to the present work, there have been several negative-parity states identified or suggested by the earlier (d, p) and neutron resonance studies [7,8,[12][13][14][15][16][17][18]. The maximum spin assigned was J π =…”

“…The 260 µg/cm 2 18 O target was made at Florida State University by the electrolysis of water enriched to 97% in 18 O on a 12.7 µm tantalum backing. The thickness of the tantalum backing was specifically chosen such that the lighter evaporated particles (protons and α particles) pass through the backing Ta layer with limited energy loss and reach the chargedparticle detector, while the heavier beam particles are stopped.…”

“…Prior to the present work, the nuclear structure of 31 Si had been studied by β − decay from 31 Al [1,2], 30 Si(n, γ) thermal neutron capture [3][4][5][6], 30 Si(n, n) neutron resonances [7,8], 29 Si(t, p) [9], 30 Si(t, d) [10,11], 30 Si(d, p) [12][13][14][15][16][17][18] and 30 Si(d, pγ) [19][20][21][22] particle transfer reactions. All the earlier experiments preferentially populated lower-spin states due to the nature of the reaction mechanisms with light projectiles.…”