dorsal/arxiv
View SchemaDelta degrees of freedom in antisymmetrized molecular dynamics and (p,p') reactions in the delta region
| Authors | Andreas Engel, Eiji I. Tanaka, Tomoyuki Maruyama, Akira Ono, Hisashi Horiuchi |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9505027 |
| URL | https://arxiv.org/abs/nucl-th/9505027 |
| DOI | 10.1103/PhysRevC.52.3231 |
| Journal | Phys.Rev.C52:3231-3248,1995 |
Abstract
Delta degrees of freedom are introduced into antisymmetrized molecular dynamics (AMD). This is done by increasing the number of basic states in the AMD wave function, introducing a Skyrme-type delta-nucleon potential, and including $NN\leftrightarrow N\Delta$ reactions in the collision description. As a test of the delta dynamics, the extended AMD is applied to (p,p$'$) recations at $E_{\rm lab}=800$ MeV for a $^{12}$C target. It is found that the ratio and the absolute values for delta peak and quasielastic peak (QEP) in the $^{12}$C(p,p$'$) reaction are reproduced for angles $\Theta_{\rm lab} \agt 40^\circ$, pointing to a correct treatment of the delta dynamics in the extended AMD. For forward angles the QEP is overestimated. The results of the AMD calculations are compared to one-step Monte Carlo (OSMC) calculations and a detailed analysis of multi-step and delta potential effects is given. As important side results we present a way to apply a Gallilei invariant theory for (N,N$'$) reactions up to $E_{\rm lab} \approx 800$ MeV which ensures approximate Lorentz invariance and we discuss how to fix the width parameter $\nu$ of the single particle momentum distribution for outgoing nucleons in the AMD calculation.
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"abstract": "Delta degrees of freedom are introduced into antisymmetrized molecular\ndynamics (AMD). This is done by increasing the number of basic states in the\nAMD wave function, introducing a Skyrme-type delta-nucleon potential, and\nincluding $NN\\leftrightarrow N\\Delta$ reactions in the collision description.\nAs a test of the delta dynamics, the extended AMD is applied to (p,p$\u0027$)\nrecations at $E_{\\rm lab}=800$ MeV for a $^{12}$C target. It is found that the\nratio and the absolute values for delta peak and quasielastic peak (QEP) in the\n$^{12}$C(p,p$\u0027$) reaction are reproduced for angles $\\Theta_{\\rm lab} \\agt\n40^\\circ$, pointing to a correct treatment of the delta dynamics in the\nextended AMD. For forward angles the QEP is overestimated. The results of the\nAMD calculations are compared to one-step Monte Carlo (OSMC) calculations and a\ndetailed analysis of multi-step and delta potential effects is given. As\nimportant side results we present a way to apply a Gallilei invariant theory\nfor (N,N$\u0027$) reactions up to $E_{\\rm lab} \\approx 800$ MeV which ensures\napproximate Lorentz invariance and we discuss how to fix the width parameter\n$\\nu$ of the single particle momentum distribution for outgoing nucleons in the\nAMD calculation.",
"arxiv_id": "nucl-th/9505027",
"authors": [
"Andreas Engel",
"Eiji I. Tanaka",
"Tomoyuki Maruyama",
"Akira Ono",
"Hisashi Horiuchi"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.52.3231",
"journal_ref": "Phys.Rev.C52:3231-3248,1995",
"title": "Delta degrees of freedom in antisymmetrized molecular dynamics and (p,p\u0027) reactions in the delta region",
"url": "https://arxiv.org/abs/nucl-th/9505027"
},
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