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- W1973989215 abstract "We present the first study of the ensuremath{beta} decay of $^{23}mathrm{Al}$ undertaken with pure samples. The study was motivated by nuclear astrophysics questions. Pure samples of $^{23}mathrm{Al}$ were obtained from the momentum achromat recoil separator (MARS) of Texas A University, collected on a fast tape-transport system, and moved to a shielded location where ensuremath{beta} and ensuremath{beta}-ensuremath{gamma} coincidence measurements were made. We deduced ensuremath{beta} branching ratios and log $mathit{ft}$ values for transitions to states in $^{23}mathrm{Mg}$, and from them determined unambiguously the spin and parity of the $^{23}mathrm{Al}$ ground state to be ${J}^{ensuremath{pi}}=5/{2}^{+}$. We discuss how this excludes the large increases in the radiative proton capture cross section for the reaction $^{22}mathrm{Mg}(p,ensuremath{gamma})^{23}mathrm{Al}$ at astrophysical energies, which were implied by claims that the spin and parity is ${J}^{ensuremath{pi}}=1/{2}^{+}$. The log $mathit{ft}$ for the Fermi transition to its isobaric analog state (IAS) in $^{23}mathrm{Mg}$ is also determined for the first time. This IAS and a state 16 keV below it are observed, well separated in the same experiment for the first time. We can now solve a number of inconsistencies in the literature, exclude strong isospin mixing claimed before, and obtain a new determination of the resonance strength. Both states are resonances in the $^{22}mathrm{Na}$($p,ensuremath{gamma}$)$^{23}mathrm{Mg}$ reaction at energies important in novae. The reactions $^{22}mathrm{Mg}(p,ensuremath{gamma})^{23}mathrm{Al}$ and $^{22}mathrm{Na}(p,ensuremath{gamma})^{23}mathrm{Mg}$ have both been suggested as possible candidates for diverting some of the flux in oxygen-neon novae explosions from the $A=22$ into the $A=23$ mass chain." @default.
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- W1973989215 date "2006-10-31" @default.
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- W1973989215 title "β decay of proton-rich nucleus<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>23</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>and astrophysical consequences" @default.
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- W1973989215 doi "https://doi.org/10.1103/physrevc.74.045810" @default.
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