### Abstract

Within the framework of the relativistic plane wave impulse approximation (RPWIA), complete sets of quasielastic (p^{→},p^{→}′) and (p^{→},n^{→}) spin observables are calculated employing a general and complete Lorentz invariant representation of the NN scattering matrix (referred to as the IA2 representation). The use of a complete representation eliminates the arbitrariness of a previously used five-term parametrization (commonly called the IA1 representation) and allows for the correct incorporation of effective-mass-type medium effects within the RPWIA framework and within the context of the Walecka model. For quasielastic scattering from a ^{40}Ca target at incident proton energies between 200 and 500 MeV, we investigate the sensitivity of complete sets of spin observables to effective nucleon masses for both IA1 and IA2 representations. In general it is seen that the IA1 representation may overestimate the importance of nuclear medium effects, whereas the IA2-based predictions nearly correspond to values for free nucleon-nucleon scattering.

Original language | English |
---|---|

Article number | 024609 |

Pages (from-to) | 246091-246096 |

Number of pages | 6 |

Journal | Physical Review C - Nuclear Physics |

Volume | 62 |

Issue number | 2 |

Publication status | Published - Jan 1 2000 |

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### All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics

### Cite this

*Physical Review C - Nuclear Physics*,

*62*(2), 246091-246096. [024609].

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*Physical Review C - Nuclear Physics*, vol. 62, no. 2, 024609, pp. 246091-246096.

**Relativistic predictions of quasielastic proton-nucleus spin observables based on a complete Lorentz invariant representation of the NN scattering matrix.** / Van Der Ventel, B. I.S.; Hillhouse, G. C.; De Kock, P. R.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Relativistic predictions of quasielastic proton-nucleus spin observables based on a complete Lorentz invariant representation of the NN scattering matrix

AU - Van Der Ventel, B. I.S.

AU - Hillhouse, G. C.

AU - De Kock, P. R.

PY - 2000/1/1

Y1 - 2000/1/1

N2 - Within the framework of the relativistic plane wave impulse approximation (RPWIA), complete sets of quasielastic (p→,p→′) and (p→,n→) spin observables are calculated employing a general and complete Lorentz invariant representation of the NN scattering matrix (referred to as the IA2 representation). The use of a complete representation eliminates the arbitrariness of a previously used five-term parametrization (commonly called the IA1 representation) and allows for the correct incorporation of effective-mass-type medium effects within the RPWIA framework and within the context of the Walecka model. For quasielastic scattering from a 40Ca target at incident proton energies between 200 and 500 MeV, we investigate the sensitivity of complete sets of spin observables to effective nucleon masses for both IA1 and IA2 representations. In general it is seen that the IA1 representation may overestimate the importance of nuclear medium effects, whereas the IA2-based predictions nearly correspond to values for free nucleon-nucleon scattering.

AB - Within the framework of the relativistic plane wave impulse approximation (RPWIA), complete sets of quasielastic (p→,p→′) and (p→,n→) spin observables are calculated employing a general and complete Lorentz invariant representation of the NN scattering matrix (referred to as the IA2 representation). The use of a complete representation eliminates the arbitrariness of a previously used five-term parametrization (commonly called the IA1 representation) and allows for the correct incorporation of effective-mass-type medium effects within the RPWIA framework and within the context of the Walecka model. For quasielastic scattering from a 40Ca target at incident proton energies between 200 and 500 MeV, we investigate the sensitivity of complete sets of spin observables to effective nucleon masses for both IA1 and IA2 representations. In general it is seen that the IA1 representation may overestimate the importance of nuclear medium effects, whereas the IA2-based predictions nearly correspond to values for free nucleon-nucleon scattering.

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M3 - Article

VL - 62

SP - 246091

EP - 246096

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

SN - 0556-2813

IS - 2

M1 - 024609

ER -