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- W1639492261 abstract "The radiative proton-capture reactions $^{19}mathrm{Ne}$($p,ensuremath{gamma}$)$^{20}mathrm{Na}$, $^{23}mathrm{Mg}$($p,ensuremath{gamma}$)$^{24}mathrm{Al}$, $^{27}mathrm{Si}$($p,ensuremath{gamma}$)$^{28}mathrm{P}$, $^{31}mathrm{S}$($p,ensuremath{gamma}$)$^{32}mathrm{Cl}$, and $^{35}mathrm{Ar}$($p,ensuremath{gamma}$)$^{36}mathrm{K}$ potentially influence energy generation and/or nucleosynthesis during explosive hydrogen burning in classical novae and/or type I x-ray bursts. The thermonuclear rates of these reactions are dependent on resonance energies ${E}_{r}={E}_{x}ensuremath{-}Q$ and strengths $ensuremath{omega}ensuremath{gamma}$. The $^{20}mathrm{Ne}$($^{3}mathrm{He}$,$t$)$^{20}mathrm{Na}$, $^{24}mathrm{Mg}$($^{3}mathrm{He}$,$t$)$^{24}mathrm{Al}$, $^{28}mathrm{Si}$($^{3}mathrm{He}$,$t$)$^{28}mathrm{P}$, $^{32}mathrm{S}$($^{3}mathrm{He}$,$t$)$^{32}mathrm{Cl}$, and $^{36}mathrm{Ar}$($^{3}mathrm{He}$,$t$)$^{36}mathrm{K}$ reactions have been measured using a 32-MeV, $^{3}mathrm{He}$${}^{2+}$ beam; ion-implanted carbon-foil targets developed at the University of Washington; and the Munich Q3D magnetic spectrograph. This experiment has already yielded precision mass measurements of $^{20}mathrm{Na}$, $^{24}mathrm{Al}$, $^{28}mathrm{P}$, and $^{32}mathrm{Cl}$ [C. Wrede et al., Phys. Rev. C 81, 055503 (2010)], which are used presently to constrain the corresponding ($p,ensuremath{gamma}$) reaction $Q$ values. The new $^{24}mathrm{Al}$ and $^{28}mathrm{P}$ masses resolve a discrepancy in the energy of the lowest-energy resonance in the $^{23}mathrm{Mg}$($p,ensuremath{gamma}$)$^{24}mathrm{Al}$ reaction and better constrain a direct measurement of its strength. Excitation energies in $^{32}mathrm{Cl}$ and $^{36}mathrm{K}$ have also been measured. An important new proton-unbound level has been found at ${E}_{x}=2196.9(7)$ keV in $^{36}mathrm{K}$ and the uncertainties in $^{36}mathrm{K}$ excitation energies have been reduced by over an order of magnitude. Using the new data on $^{36}mathrm{K}$, the $A=36$, $T=1$ triplets have been reassigned. The thermonuclear $^{35}mathrm{Ar}$($p,ensuremath{gamma}$)$^{36}mathrm{K}$ reaction rate is found to be much higher than a commonly adopted rate and this could affect energy generation in type I x-ray bursts." @default.
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- W1639492261 date "2010-09-29" @default.
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- W1639492261 title "Properties of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mmultiscripts><mml:mi mathvariant=normal>Na</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>20</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>,<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mmultiscripts><mml:mi mathvariant=normal>Al</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>24</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>,<mml:math …" @default.
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- W1639492261 doi "https://doi.org/10.1103/physrevc.82.035805" @default.
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