Radiative Pion Capture from the1sLevel inLi6

Abstract

Partial rates for radiative capture from the Is atomic level in 6 Li to the lowest two 6 He states have been determined by measuring, with the necessary energy resolution, x rays and high-energy photons in coincidence. A comparison of our results and other related experimental results with different theoretical approaches shows that phenomenological wave functions consistently describe photopion processes as well as electromagnetic and weak transitions between low-lying 6 Li and 6 He states.

Radiative pion capture in H2 , He3 , and Golak1, Skibiński2, Topolnicki3 et al. 2018Phys. Rev. C

“…[57]. They also predicted the decisive role of FSI and the dominant contribution of the π − + 3 He → γ + n + d channel in the radiative breakup of 3 He.…”

“…Since we restrict ourselves to reactions with two and three nucleons in the present paper, we only refer the reader to Refs. [3][4][5][6][7][8][9][10][11][12] for later studies of systems with A > 3.…”

“…Even though this work prior to January 1976 is described in Ref. [2], we mention here a pioneering contribution by Messiah [46], who formulated a theoretical framework to deal with pion capture (not only radiative), discussed various dynamical aspects, and gave pre-dictions for all the six reaction channels for the 3 He nucleus, which were, however, based on very crude approximations in the closure formulas.…”

“…Using a formula from Ref. [59] and making a connection between the Gamow-Teller matrix element in triton β decay and the corresponding matrix elements in nonbreakup pion radiative capture on 3 He, the authors of Ref. [57] also provided a result for the π − + 3 He → γ + 3 H capture rate.…”

Radiative Pion Capture on 12C

“…See Ref. 27) .) However, the experimental data on the ratio of the radiative pion capture rate to the total pion capture rate are available.…”