Double-charge-exchange and inelastic scattering in π−+3He

doi:10.1016/0550-3213(74)90287-9

Nuclear Physics B

Volume 78, Issue 2, 25 August 1974, Pages 345-369

https://doi.org/10.1016/0550-3213(74)90287-9 Get rights and content

Abstract

The reactions π⁻+³He→⁺+3n and π⁻+³He→⁻+³He were studied to investigate the $T= 32$ three-nucleon system. The differential cross sections were measured at scattering angles from 20 to 40 degrees. The secondary pion was momentum analyzed in a magnetostrictive-readout wire-chamber spectrometer. The double-charge-exchange reaction yielded a secondary pion energy distribution, the features of which can be due to either a $T= 32$ three-nucleon resonance or a resonace of the nucleons in the ³He nucleus. The inelasticc scaterring reaction yielded a secondary pion energy distribution peaked near threshold, consistent with resonances in both the $T= 32$ and $T= 12$ three-nucleon systems.

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Citation Excerpt :
Several experiments were employed to study the reaction 3He (π−, π+)3n. For example, Sperinda et al. obtained DCX spectrum at energy of 140 MeV for 3He(π−, π+)3n and scattering angle θ = 30 and they attempted to explain their results based on the assumption of three neutrons resonance system [3]. Stetz et al. measured cross sections, differential and doubly differential cross sections for the same reaction 3He(π−, π+) at 140, 200, and 295 MeV at various angles.
The calculation of the doubly differential cross section was performed using sequential single charge exchange mechanism for the double charge exchange reaction ³He (π⁻, π⁺) 3n. The effect of the final state interaction between two active neutrons was investigated using Malfliet Tjon potential. Our results were compared with experimental results at intermediate energy range for the values 120, 180, 210 and 240 MeV. In this study, pion production was used to interpret the low energy peak that was observed on the forward angles at the incident energies of 210 and 240 MeV.
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We have measured the differential cross section $d^{2} σ/ d Ω d T$ for the double charge exchange reactions ⁴He(π⁺, π⁻)4p and ³He(π⁻, π⁺)3n at 140, 200 and 295 MeV. By fitting this data with a simple phase-space model we have estimated the integrated cross section $d σ/ d Ω$ and the total cross section. The ⁴He data agree qualitatively with the predictions of a meson exchange calculation and with one version of the successive single charge exchange model. The ³He cross sections are considerably larger than those of ⁴He and in some cases the missing mass plot shows a strong enhancement, which resembles a broad three-nucleon resonance.
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^∗: Present address: Oximetrix, Mountain View, Calif.

^∗∗: Also at the University of California, San Francisco.

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Nuclear Physics B

Abstract

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