Search for excited states in O 25
作者： M. D. Jones , K. Fossez , T. Baumann , P. A. DeYoung , J. E. Finck
DOI: 10.1103/PHYSREVC.96.054322
关键词: Population 、 Density matrix renormalization group 、 Bound state 、 Atomic physics 、 Configuration interaction 、 Ground state 、 Proton 、 Excited state 、 Physics 、 Parity (physics)
摘要: Background: Theoretical calculations suggest the presence of low-lying excited states in $^{25}\mathrm{O}$. Previous experimental searches by means proton knockout on $^{26}\mathrm{F}$ produced no evidence for such excitations.Purpose: We search $^{25}\mathrm{O}$ using $^{24}\mathrm{O}(d,p)^{25}\mathrm{O}$ reaction. The theoretical analysis unbound $^{25,27}\mathrm{O}$ is based configuration interaction approach that accounts couplings to scattering continuum.Method: use invariant-mass spectroscopy measure neutron-unbound For approach, we complex-energy Gamow Shell Model and Density Matrix Renormalization Group method with a finite-range two-body optimized bound resonances $^{23--26}\mathrm{O}$, assuming core $^{22}\mathrm{O}$. predict energies, decay widths, asymptotic normalization coefficients.Results: Our large $spdf$ space several positive negative parity, obtain an limit relative cross section possible ${J}^{\ensuremath{\pi}}={1/2}^{+}$ state respect ground at ${\ensuremath{\sigma}}_{1/2+}/{\ensuremath{\sigma}}_{g.s.}=0.{25}_{\ensuremath{-}0.25}^{+1.0}$. also discuss how observation parity could guide $^{27}\mathrm{O}$.Conclusion: experiments suffered from low sections population because spectroscopic factors. In this respect, neutron transfer reactions carry more promise.
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