Sains Malaysiana 49(4)(2020): 877-884

http://dx.doi.org/10.17576/jsm-2020-4904-17

Halo Structure Investigation of Nucleus ⁸He via Core Deformation Parameter

(Penyelidikan Struktur Halo Nukleus ⁸He via Parameter Kecanggaan Teras)

FITRI HAKEEM M. SALIH, JOBAIDUL ISLAM, SHAHIDAN RADIMAN & KHOO KOK SIONG*

Nuclear Technology Research Centre, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

Received: 24 July 2019/Accepted: 23 December 2019

ABSTRACT

Helium-8 (⁸He) is a four neutrons halo nucleus and is the halo nucleus that attract attention to observe because it belongs to the group of light dripline nuclei. We studied the two neutrons halo nucleus of ⁸He. This halo nucleus lies on the neutron rich dripline in the nuclear landscape. Nucleus ⁸He was investigated in the Three-body Model with two different configurations (T and Y). To describe the Three-body Model, Jacobi coordinate systems for few bodies was used for this hyper-nucleus(⁸He). In this study, core(⁶He) + two valence neutrons (n + n) were considered as the Three-body. Based on the finding, theoretical data on configuration Y met a good agreement with the experimental data of binding energy and rms matter radius. While for configuration T, the data slightly differ from the experimental data. The results showed that the core deformation parameters, B2 of ⁸He were 0.12, 0.19, 0.35, 0.40, and 0.47. The binding energies -3.112 MeV, -3.416 MeV, and -3.625 MeV were calculated for the deformation parameters 0.35, 0.40, and 0.47 and rms radii 2.032 fm, 2.305 fm, and 2.39 fm were found for the deformation parameters 0.19, 0.35, and 0.4, respectively. In conclusion, ⁸He exhibits in prolate due to positive values of core deformation parameters.

Keywords: Core deformation parameter; halo nucleus; Three-body Model

ABSTRAK

Helium-8 (⁸He) adalah empat neutron nukleus halo dan nukleus halo yang menarik perhatian untuk diperhatikan kerana ia tergolong dalam kumpulan garis titisan nukleus ringan. Kami mengkaji dua neutron nukleus halo ⁸He. Nukleus halo ini terletak pada garis titisan yang kaya dengan neutron dalam landskap nuklear. Nukleus ⁸He dikaji menggunakan dua konfigurasi (T dan Y) di dalam Model Tiga-jasad. Untuk menggambarkan Model Tiga-jasad, Jacobi menyelaraskan sistem untuk beberapa badan digunakan untuk hiper-nukleus (⁸He). Dalam kajian ini, teras (⁶He) + dua neutron valens (n + n) dianggap sebagai Tiga-jasad. Berdasarkankeputusan kajian, data teori pada konfigurasi Y menghampiri dengan nilaiuji kajitenaga ikatan dan rms jejari jirim. Manakala, pada konfigurasi T, data teori didapati berbeza daripada data uji kaji. Hasil kajian menunjukkan bahawa parameter kecanggaan teras bagi, B2 ⁸He adalah 0.12, 0.19, 0.35, 0.40 dan 0.47. Kesimpulannya, ⁸He berbentuk sferoid lonjong disebabkan nilai positif parameter kecanggaan teras.

Kata kunci: Model Tiga-jasad; nukleus halo; parameter kecanggaan teras

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*Corresponding author; email: khoo@ukm.edu.my