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THE RESPONSE FUNCTION OF THE ⁴He, ¹⁶O AND ⁴⁰Ca NUCLEI IN THE HARMONIC OSCILLATOR SHELL MODEL AND THE IMPULSE APPROXIMATIONS

M. MODARRES

Physics Department, University of Tehran, 1439955961 Tehran, Iran

Corresponding author.

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and

Y. YOUNESIZADEH

Department of Physics, Shahre-Rey Branch, Islamic Azad University, Tehran, Iran

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https://doi.org/10.1142/S0218301313500110Cited by:1 (Source: Crossref)

Abstract

In this work, the response functions (RFs) of the ⁴He, ¹⁶O and ⁴⁰Ca nuclei are calculated in the harmonic oscillator shell model (HOSM) and the impulse approximation (IA). First, the one-body momentum distribution and the one-body spectral functions for these nuclei are written in the HOSM configuration. Then, their RFs are calculated, in the two frameworks, namely the spectral and the momentum distribution functions, within the IA. Unlike our previous work, no further assumption is made to reduce the analytical complications. For each nucleus, it is shown that the (RF) evaluated using the corresponding spectral function has a sizable shift, with respect to the one calculated in terms of the momentum distribution function. It is concluded that for the heavier nuclei, this shift increases and reaches nearly to a constant value (approximately 62 MeV), i.e., similar to that of nuclear matter. It is discussed that in the nuclei with the few nucleons, the above shift can approximately be ignored. This result reduces the theoretical complication for the explanation of the ongoing deep inelastic scattering (DIS) experiments of ³H or ³H nucleus target in the Jefferson Laboratory. On the other hand, it is observed that in the heavier nuclei, the RF heights (width) decrease (increase), i.e., the comparison between the theoretical and the experimental electron nucleus scattering cross-section is more sensible for heavy nuclei rather than the light ones.

Keywords:

PACS: 24.10.Cn, 25.30.Fj, 61.12.Bt

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