The 48Ca(d→, 3He)47K reaction at 80 MeV

βdecay ofAr47

“…In addition, a weakly populated 7 / 2 − state was observed at Ϸ1.97 MeV as reported in Ref. [5]. The assignment of this level was confirmed recently in a brief report [6] on an in-beam spectroscopy experiment using a deepinelastic heavy ion reaction and the GASP array.…”

“…In early reaction studies [1][2][3], information on the 1 / 2 − ground state, and the 3 / 2 + first-excited state at 360 keV for 47 K was obtained. In later experiments utilizing the 48 Ca͑d , 3 He͒ 47 K reaction [4,5] several positiveparity levels corresponding to proton-hole excitations in the sd shell were observed up to an excitation energy of 8.5 MeV. In addition, a weakly populated 7 / 2 − state was observed at Ϸ1.97 MeV as reported in Ref.…”

Shell structure atN=28near the dripline: Spectroscopy ofSi42,Fridmann1, Wiedenhöver2, Gade3 et al. 2006Phys. Rev. C543140View full textAdd to dashboardCite

“…Therefore, the states in 43 P populated with the largest cross sections in the one-proton knockout reaction on 44 S are expected to be those that are single protons in the d 3/2 or s 1/2 orbits, or a single d 5/2 proton hole. In 47 K, (a proton hole coupled to the doubly-magic nucleus 48 Ca), the centroids of the strength from the d 3/2 and s 1/2 proton orbits are seen to be separated by only 300 keV [24,25]. In the present measurement of 43 P, the 184 keV γ-ray suggests that the strength of one of these two single-proton orbits is concentrated in the ground state with the strength of the other orbit concentrated in an excited state at 184 keV.…”

“…Bazin et al [16] pointed out that the cross section for the two-proton knockout reaction depends on the number of valence protons, so the small cross section observed here suggests that a shell closure occurs at Z = 14 where the d 5/2 proton orbit fills. Indeed, in the N = 28 isotone 48 Ca, the (d, 3 He) reaction [24,25] revealed a large gap between the d 5/2 proton orbit and the d 3/2 and s 1/2 proton orbits (which are nearly degenerate in 48 Ca). The small two-proton knockout cross section provides strong evidence that the Z = 14 shell gap is substantial in 42 Si as well.…”

A consistent analysis of (e,e′p) and (d,3He) experiments

“…In Section 3 it is investigated, which part of the bound-state wave function (BSWF) is probed by the (e,e ′ p) and (d, 3 He) reactions, in order to understand the model sensitivity arising from the shape of the BSWF. In Section 4 one 48 Ca(e,e ′ p) [13] and two 48 Ca(d, 3 He) [15,16] data sets are used for a detailed comparison between the (e,e ′ p) and (d, 3 He) spectroscopic factors. In Section 5 a re-analysis of (d, 3 He) data sets for other nuclei is made, in which non-locality and finite range corrections are included and BSWF's deduced from (e,e ′ p) experiments are used.…”