DATE: 2017. June. 12th. 13:40-
PLACE: Tokai 1st Building Room 116
TITLE:Competing effects of nuclear deformation and
hyperonic many-body force on Lambda binding energy
LANGUAGE: English
SPEAKER: Prof. Masahiro Isaka (Osaka Univ. RCNP Center)
CONTACT: Dr. Kazuya Aoki, j-parc-pn-seminar-(AT)-ml.post.kek.jp
Abstract:
In this talk, I will discuss competitive
effects between nuclear deformation and density dependence of Lambda N interaction
in Lambda binding energies $B_\Lambda$ of hypernuclei on the basis of the
baryon-baryon interaction model ESC (extended soft core). Since Lambda
hypernuclei in p-, sd- and pf-shell mass regions have various structures in the
ground states, the density dependence of the Lambda-N interaction can affect
the systematics of the $B_\Lambda$ values. Recently, many authors discuss
hyperonic many-body force acting not only on nucleonic but also hyperonic
channels at high density, related to so-called “hyperon puzzle”, which is suggested by
the stiff equation-of-state giving the neutron-star mass. Due to the strong
density dependence of hyperonic many-body force, it can affect the systematic
data of the B_\Lambda values.
To see such effects, we perform microscopic
calculations of Lambda hypernuclei with 9 \le A \le 59 within the framework of
the antisymmetrized molecular dynamics by using the Lambda N G-matrix
interaction derived from ESC including many-body force effects. We found that
proper description of hypernuclear structure, especially nuclear deformation,
is indispensable to see the effects on the B_\Lambda values. In this talk, I
will discuss the effects by the hyperonic many-body force in B_\Lambda values
as well as importance of describing nuclear def