Measurement of the IAS resonance strength in 23Mg

Absolute determination of theNa22(p,γ)Sallaska1, Wrede2, Garcı́a3 et al. 2011Phys. Rev. C255340View full textAdd to dashboardCite

“…Using the beta-delayed proton branch from Tighe et al [20], the proton-to-gamma-ray branching of Peräjärvi et al [21], and the lifetime of Jenkins et al [26], Iacob et al claimed a total strength of 2.6 ± 0.9 meV, in contrast to our value of 5.7 +1.6 −0.9 meV. We consider the value of Iacob et al to be unreliable.…”

“…Consequently, the rate is dependent on the energies and strengths of these resonances, which have been investigated both indirectly and directly in the past. Indirect information on potential 22 Na(p, γ) resonances has been derived from measurements of the 24 Mg(p, d) [17], 25 Mg(p, t) [18], and 22 Na( 3 He,d) [19] reactions, and from the beta-delayed proton-and gammadecays of 23 Al [20][21][22]. The first published attempt to measure the 22 Na(p, γ) reaction directly employed a chemically prepared, radioactive 22 Na target and produced only upper limits on the resonance strengths [23].…”

“…We have measured the energies, strengths, and branches of known resonances [24,25] and searched for proposed resonances [20][21][22]26] in the energy range E p ∼ 195 to 630 keV. The measurements were performed at the Center for Experimental Nuclear Physics and Astrophysics of the University of Washington with ion-implanted 22 Na targets prepared at TRIUMF-ISAC.…”

Experimental study ofβ-delayed proton decay ofAl23for nucleosynthesis in novae

“…This leads eventually into the MgAl cycle and to a reduced abundance of 22 Na in the end products. The rates of these depleting reactions have been of considerable interest, and recent studies include 21 Na(p,γ) 22 Mg [6,7], 22 Mg(p,γ) 23 Al [8][9][10], 22 Na(p,γ) 23 Mg [11][12][13][14][15][16][17][18], 23 Na(p,γ) 24 Mg [19] and 23 Mg(p,γ) 24 Al [20]. It is believed that novae could become the first type of explosive process for which all the nuclear input to the nucleosynthesis calculations is based on experimental data [21].…”

Two measurements of the22Na+p resonant scattering via thick-target inverse-kinematics method

“…Comparing to its relatively long half life, the main depletion mechanism of 22 Na is through the 22 Na(p,γ) 23 Mg reaction, the reaction rate over a large range of temperatures is thus crucial in deriving ranges of 22 Na production during nova and supernova outbursts. Many experimental investigations have been carried out to reduce the uncertainties of the 22 Na(p,γ) 23 Mg reaction rate, including direct measurements of the reaction rate with radioactive 22 Na targets [13][14][15][16], or indirect measurements for 23 Mg resonance properties via the β decay of 23 Al [17][18][19][20], and various transfer [21][22][23] or fusion-evaporation [24,25] reactions. In these studies new 23 Mg levels were identified in the energy region of astrophysical interest.…”