The formation of isomeric pair in the natTi(3He,x)44m,gSc reactions: Effect of spin cut-off parameter on the isomeric ratio

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:499

Article

Khandaker, Mayeen Uddin¹  Chakraborty, Animesh Kumer²  Nagatsu, Kotaro³  Obata, Honoka³  Minegishi, Katsuyuki³  Zhang, Ming-rong³  Okhunov, A. A.⁴ 

[1] Sunway Univ, Ctr Appl Phys & Radiat Technol, Sch Engn & Technol, Bandar Sunway 47500, Selangor, Malaysia

[2] Chittagong Univ Engn & Technol, Dept Phys, Chittagong 4349, Bangladesh

[3] Natl Inst Quantum & Radiol Sci & Technol, 4-9-1 Inage, Chiba 2638555, Japan

[4] Int Islamic Univ Malaysia, Dept Sci Engn, Kuala Lumpur 50728, Malaysia

关键词: Natural titanium;    3He-particle activation;    Stacked-foil technique;    Sc isomeric pair;    Model calculations;   

DOI  :  10.1016/j.nimb.2021.04.014

来源: Elsevier

【 摘 要 】

Excitation functions for the natTi(3He, x)44g,mSc nuclear reactions were measured from respective threshold up to 55 MeV by using a conventional stacked-foil activation technique combined with HPGe gamma-ray spectroscopy. Individual cross-section values for the production of 44mSc and 44gSc were separated using a proper mathematical method on the basis of their individual gamma lines and the data for 44gSc are reported here for the first time. The default parameters of TALYS-1.8 are unable to provide the 44mSc/44gSc isomeric cross-section ratio values consistent with those obtained experimentally. However, an adjustment of the level density model and optical model potentials together with some other relevant parameters, especially the spin cut-off parameter with the variation of eta (=Ieff/Irigid) were found to be effective to reproduce the measured cross-sections. A similar parameter adjustment could be useful for accurate prediction of other medium mass isomeric pairs (i.e., when the metastable state is longer-lived than the ground state) where either experimental data are not available, or an expensive experiment is required to obtain them.

【 授权许可】

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