## Abstract

We investigate the {pi}-nucleus interaction for 600 - 900 MeV/c by microscopically examining dynamical modifications of N{sup *} resonances in nuclear matter. The pion production through the {pi}{Delta} channel is appreciably suppressed in nuclei because the pion produced suffers strong distortion by a {Delta} formation with a neighboring nucleon. This effect makes the width of N(1520) smaller and the mass larger in nuclei than in free space, and the {pi}N D{sub 13}-wave amplitude loses much of its inelasticity in nuclei. A similar situation arises with N(1535) and the {pi}N S{sub 11}-wave amplitude because the {eta}N channel is suppressed by Pauli blocking on the nucleon accompanying {eta}. These effects, however, change the {pi}-nucleus elastic-scattering cross sections by only a small amount because of Fermi averaging. They may appear significantly in some inelastic reactions. Spreading potential makes the width of N{sup *} larger and counteracts the pion-production suppression, but it cannot explain the puzzling disagreement between the data and the calculations. (author).

Arima, Masaki;

^{[1] }Masutani, Keiichi; Seki, Ryoichi- Jochi Univ., Tokyo (Japan). Faculty of Science and Technology

## Citation Formats

Arima, Masaki, Masutani, Keiichi, and Seki, Ryoichi.
Pion-nucleon interaction in nuclear matter above the {Delta} resonance energy.
Japan: N. p.,
1993.
Web.

Arima, Masaki, Masutani, Keiichi, & Seki, Ryoichi.
Pion-nucleon interaction in nuclear matter above the {Delta} resonance energy.
Japan.

Arima, Masaki, Masutani, Keiichi, and Seki, Ryoichi.
1993.
"Pion-nucleon interaction in nuclear matter above the {Delta} resonance energy."
Japan.

@misc{etde_10110008,

title = {Pion-nucleon interaction in nuclear matter above the {Delta} resonance energy}

author = {Arima, Masaki, Masutani, Keiichi, and Seki, Ryoichi}

abstractNote = {We investigate the {pi}-nucleus interaction for 600 - 900 MeV/c by microscopically examining dynamical modifications of N{sup *} resonances in nuclear matter. The pion production through the {pi}{Delta} channel is appreciably suppressed in nuclei because the pion produced suffers strong distortion by a {Delta} formation with a neighboring nucleon. This effect makes the width of N(1520) smaller and the mass larger in nuclei than in free space, and the {pi}N D{sub 13}-wave amplitude loses much of its inelasticity in nuclei. A similar situation arises with N(1535) and the {pi}N S{sub 11}-wave amplitude because the {eta}N channel is suppressed by Pauli blocking on the nucleon accompanying {eta}. These effects, however, change the {pi}-nucleus elastic-scattering cross sections by only a small amount because of Fermi averaging. They may appear significantly in some inelastic reactions. Spreading potential makes the width of N{sup *} larger and counteracts the pion-production suppression, but it cannot explain the puzzling disagreement between the data and the calculations. (author).}

place = {Japan}

year = {1993}

month = {Apr}

}

title = {Pion-nucleon interaction in nuclear matter above the {Delta} resonance energy}

author = {Arima, Masaki, Masutani, Keiichi, and Seki, Ryoichi}

abstractNote = {We investigate the {pi}-nucleus interaction for 600 - 900 MeV/c by microscopically examining dynamical modifications of N{sup *} resonances in nuclear matter. The pion production through the {pi}{Delta} channel is appreciably suppressed in nuclei because the pion produced suffers strong distortion by a {Delta} formation with a neighboring nucleon. This effect makes the width of N(1520) smaller and the mass larger in nuclei than in free space, and the {pi}N D{sub 13}-wave amplitude loses much of its inelasticity in nuclei. A similar situation arises with N(1535) and the {pi}N S{sub 11}-wave amplitude because the {eta}N channel is suppressed by Pauli blocking on the nucleon accompanying {eta}. These effects, however, change the {pi}-nucleus elastic-scattering cross sections by only a small amount because of Fermi averaging. They may appear significantly in some inelastic reactions. Spreading potential makes the width of N{sup *} larger and counteracts the pion-production suppression, but it cannot explain the puzzling disagreement between the data and the calculations. (author).}

place = {Japan}

year = {1993}

month = {Apr}

}