Study of the reactions 24,26Mg(3He, n)26,28Si and 28Si(3He, n)30S

Structure of resonances in the Gamow burning window for theAl25(p,γ)Si26reaction in nov

“…It should be noted, that the dominant component seen in the earlier ( 3 He,n) study of Ref. [14] is 0 + at ∼5910 keV, whereas in contrast in Parpottas et al [9] the (higher excitation energy) state assigned as 0 + is produced significantly more weakly than the neighbouring peak/state. Finally, a state at 5945(8) keV was reported in a multi-nucleon transfer reaction by Caggiano et al [10].…”

“…1 in Ref. [14] a tail can be noticed on the high-energy side of the 5.91-MeV peak). The results of Bohne et al [14] are consistent with a strongly-populated natural parity 0 + state at 5890 keV and a weaker unnatural-parity 3 + level at 5927 keV.…”

“…[14] a tail can be noticed on the high-energy side of the 5.91-MeV peak). The results of Bohne et al [14] are consistent with a strongly-populated natural parity 0 + state at 5890 keV and a weaker unnatural-parity 3 + level at 5927 keV. Parpottas et al [9] assumed a dominant compound nucleus mechanism at their slightly lower beam energies and used a comparison of the cross section with Hauser-Feshbach calculations (at each of three individual angle/ energy settings) to assign 3 + and 0 + quantum numbers to states at 5912 and 5948 keV, respectively [9].…”

“…In a detailed study of neutron differential cross-sections for the 24 Mg( 3 He,n) reaction by Bohne et al [14], performed at a slightly higher beam energy of 13 MeV, a structure was observed at 5.91(3) MeV. Using a DWBA analysis, this structure was deduced as being consistent with a dominant l=0, two-neutron transfer component at forward angles, and a weaker l=4 one at more backward angles (the resolution was insufficient to resolve the states -inspecting the spectrum of Fig.…”

“…The burning regime in novae occurs at temperatures of ∼0.1-0.4 GK, where the reaction rate is expected to be dominated by resonant reactions on 1 + , 0 + and 3 + states predicted by sd-shell model calculations [7] to be located just above the proton threshold energy of 5513.7(5) keV in 26 Si [8]. Considerable experimental efforts have gone into identifying and locating these resonant states [9][10][11][12][13][14][15][16][17][18][19][20]. The location of the 3 + s-wave resonance, corresponding to a level at 5928.7(6) keV in 26 Si, seems now to be unambiguously established from β-decay studies of 26 [12,20], with ∼100% proton-decay branches reported for this state [11,17].…”