### Abstract

Existing cross-section data for [Formula Presented]-shell knockout in the reaction [Formula Presented] —as obtained under different kinematic conditions—are shown to be mutually consistent, apart from a recent measurement performed in Mainz. New data have been collected at the Amsterdam Pulse Stretcher that confirm the normalization of the older measurements. An analysis of the world’s [Formula Presented] data has yielded precise values of the spectroscopic factor for [Formula Presented]-shell and [Formula Presented]-shell knockout from [Formula Presented] These values have been used to evaluate the transparency of the [Formula Presented] nucleus for [Formula Presented]-shell and [Formula Presented]-shell protons separately on the basis of recent high-energy [Formula Presented] data taken at a four-momentum transfer squared [Formula Presented] of 1.1 [Formula Presented] As the resulting average value of the nuclear transparency, [Formula Presented] is considerably higher than the value obtained from previous analyses and theoretical estimates, the high [Formula Presented] data were used instead for an independent determination of the spectroscopic strength for [Formula Presented] knockout. Combining these results with the low [Formula Presented] data the spectroscopic factors appear to be momentum-transfer dependent. Possible explanations of these surprising results in terms of reaction-mechanism effects or a possible breakdown of the quasiparticle concept at high [Formula Presented] are discussed as well.

Original language | English (US) |
---|---|

Number of pages | 1 |

Journal | Physical Review C - Nuclear Physics |

Volume | 61 |

Issue number | 6 |

DOIs | |

State | 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*,

*61*(6). https://doi.org/10.1103/PhysRevC.61.064325

}

*Physical Review C - Nuclear Physics*, vol. 61, no. 6. https://doi.org/10.1103/PhysRevC.61.064325

**Transparency of [Formula Presented] for protons.** / Lapikás, L.; van der Steenhoven, G.; Frankfurt, L.; Strikman, Mark; Zhalov, M.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Transparency of [Formula Presented] for protons

AU - Lapikás, L.

AU - van der Steenhoven, G.

AU - Frankfurt, L.

AU - Strikman, Mark

AU - Zhalov, M.

PY - 2000/1/1

Y1 - 2000/1/1

N2 - Existing cross-section data for [Formula Presented]-shell knockout in the reaction [Formula Presented] —as obtained under different kinematic conditions—are shown to be mutually consistent, apart from a recent measurement performed in Mainz. New data have been collected at the Amsterdam Pulse Stretcher that confirm the normalization of the older measurements. An analysis of the world’s [Formula Presented] data has yielded precise values of the spectroscopic factor for [Formula Presented]-shell and [Formula Presented]-shell knockout from [Formula Presented] These values have been used to evaluate the transparency of the [Formula Presented] nucleus for [Formula Presented]-shell and [Formula Presented]-shell protons separately on the basis of recent high-energy [Formula Presented] data taken at a four-momentum transfer squared [Formula Presented] of 1.1 [Formula Presented] As the resulting average value of the nuclear transparency, [Formula Presented] is considerably higher than the value obtained from previous analyses and theoretical estimates, the high [Formula Presented] data were used instead for an independent determination of the spectroscopic strength for [Formula Presented] knockout. Combining these results with the low [Formula Presented] data the spectroscopic factors appear to be momentum-transfer dependent. Possible explanations of these surprising results in terms of reaction-mechanism effects or a possible breakdown of the quasiparticle concept at high [Formula Presented] are discussed as well.

AB - Existing cross-section data for [Formula Presented]-shell knockout in the reaction [Formula Presented] —as obtained under different kinematic conditions—are shown to be mutually consistent, apart from a recent measurement performed in Mainz. New data have been collected at the Amsterdam Pulse Stretcher that confirm the normalization of the older measurements. An analysis of the world’s [Formula Presented] data has yielded precise values of the spectroscopic factor for [Formula Presented]-shell and [Formula Presented]-shell knockout from [Formula Presented] These values have been used to evaluate the transparency of the [Formula Presented] nucleus for [Formula Presented]-shell and [Formula Presented]-shell protons separately on the basis of recent high-energy [Formula Presented] data taken at a four-momentum transfer squared [Formula Presented] of 1.1 [Formula Presented] As the resulting average value of the nuclear transparency, [Formula Presented] is considerably higher than the value obtained from previous analyses and theoretical estimates, the high [Formula Presented] data were used instead for an independent determination of the spectroscopic strength for [Formula Presented] knockout. Combining these results with the low [Formula Presented] data the spectroscopic factors appear to be momentum-transfer dependent. Possible explanations of these surprising results in terms of reaction-mechanism effects or a possible breakdown of the quasiparticle concept at high [Formula Presented] are discussed as well.

UR - http://www.scopus.com/inward/record.url?scp=85035271467&partnerID=8YFLogxK

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U2 - 10.1103/PhysRevC.61.064325

DO - 10.1103/PhysRevC.61.064325

M3 - Article

AN - SCOPUS:85035271467

VL - 61

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

SN - 0556-2813

IS - 6

ER -