Pionic atom formation in halo nuclei by(d,3He)reactions

Abstract

We investigate the formation cross sections of the deeply bound pionic atoms on halo nuclei theoretically. We consider one-neutron pick-up (d, 3 He) reaction for the pionic atom formation and find that the formation rate is significantly increased by the existence of the halo neutron with long tail of the wave function. This enhancement is expected to increase the experimental feasibility for the formation of the deeply bound pionic states on β-unstable nuclei.

Spectroscopy ofAl24and extraction of Gamow-Teller strengths with theMg24Zegers1, Meharchand2, Adachi3 et al. 2008Phys. Rev. C251121View full textAdd to dashboardCite

“…These include states 7 and 8, which fall in the region of interest for the 23 Mg(p, γ) 24 Al reaction. The kinematical shifts of these states matched the expectation for a target with a mass close to A=24 and because their energies do not coincide with any known 16 [8,26,28]. No significant signatures of the presence of these reactions were identified.…”

“…The 26 Mg( 3 He,t) spectrum was also useful for calibrating the triton energies measured in the spectrometer, since the excitation energy spectrum of 26 Al is well known from two previous ( 3 He,t) experiments [8,26] and other experimental studies [20]. A minor correction had to be applied due to the small difference in thickness for the 24 Mg and 26 Mg targets.…”

“…A 20% correction to the cross sections for the present data had to be applied. Except for this normalization factor, angular distributions for the 26 …”

“…However, because of inefficient current integration when running in dispersion-matched mode, a correction had to be applied. To determine this correction factor, data were also taken on a 26 Mg target, with a thickness of 0.87 mg/cm 2 . Cross sections for the 26 Mg( 3 He,t) reaction were measured previously in an experiment ran in lower-resolution achromatic mode and used for the calibration of the unit cross sections [8,11].…”

“…To determine this correction factor, data were also taken on a 26 Mg target, with a thickness of 0.87 mg/cm 2 . Cross sections for the 26 Mg( 3 He,t) reaction were measured previously in an experiment ran in lower-resolution achromatic mode and used for the calibration of the unit cross sections [8,11]. A 20% correction to the cross sections for the present data had to be applied.…”