Study on the hypertriton structure with Gaussian expansion method

by Yongwoo Choi (MS Candidate)

Wednesday Nov 26, 2014, 4:10 PM → 4:40 PM Asia/Seoul

119호 (제1과학관)

The hyperon-nucleon (YN) interactions have a large ambiguity for various mod- els because of a lack of scattering data. In order to consider this ambiguity, it is necessary to figure out the contributions from each term of the potential by solving the few-body problem. Hyperons are distinguished from nucleons by their interac- tion and are placed in an independent effective potential in a simple single-particle model. Therefore, they can exist deep inside of the nucleus and change the nuclear structure through the glue-like role of the Lambda (Λ) hyperon. We confirm these properties theoretically by using Gaussian expansion method with employing the Argonne V08 NN potential, effective YN potential and so on. The Λ-separation en- ergy for the ground state of hypertriton is obtained as 0.17 MeV, and this result is consistent with the experimental data. The ratio of the shrinkage effect is about 6.83 % as the size of deuteron is decreased to 3.58 fm with the Λ hyperon from 3.85 fm without that. We also confirm the halo structure, which implies that the deuteron system is a core surrounded by the Lambda particle, with calculating probability density of the hypertriton substructures.

Thesis Advisor: Prof. Yongseok Oh