Single and double delta production in the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></mrow></math>He<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>(</mo><mi>γ</mi><mo>,</mo><mrow><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow><mrow><msup><mrow><mi>π</mi></mrow><mrow><mi>−</mi></mrow></msup></mrow><mo>)</mo></math> reaction at 380⩽<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>E</mi></mrow><mrow><mi>γ</mi></mrow></msub></mrow><mo><~</mo><mn>700</mn></math> MeV

D. G. Watts; G. M. Huber; G. J. Lolos; B. Lasiuk; S. Kato; M. Koike; K. Maruyama; K. Niki; Y. Wada; K. Maeda; T. Suda; T. Emura; H. Miyamoto; S. Endo; Y. Sumi; O. Konno; H. Yamazaki; H. Itoh; T. Maki; A. Sasaki; The TAGX Collaboration

doi:10.1103/PhysRevC.55.1832

Single and double delta production in the $^{3}$ He $(γ, π^{+} π^{-})$ reaction at 380⩽ $E_{γ} <~ 700$ MeV

D. G. Watts, G. M. Huber, G. J. Lolos, B. Lasiuk, S. Kato, M. Koike, K. Maruyama, K. Niki, Y. Wada, K. Maeda, T. Suda, T. Emura, H. Miyamoto, S. Endo, Y. Sumi, O. Konno, H. Yamazaki, H. Itoh, T. Maki, and A. Sasaki (The TAGX Collaboration)

Phys. Rev. C 55, 1832 – Published 1 April 1997

Abstract

Results are presented for the $^{3}$ He $(γ, π^{+} π^{-})$ reaction in the region 380 $<~ E_{γ} <~ 700$ MeV, investigated with the use of a 10% duty factor tagged photon beam, in conjunction with the TAGX multiparticle spectrometer. The study of such multipion photoproduction reactions has motivated a number of chiral symmetric models, and is expected to provide an insight on the role of the $Δ$ and $N^{*}$ resonances in the nuclear medium. From comparisons of the data with simple reaction simulations, it was found that the data were best fit with a combination of multibody phase space channels, quasifree $Δ$ and $N^{*}$ , and $Δ Δ$ production channels. The results are compared with other double pion photoproduction reactions on hydrogen and deuterium.