ELFT HÍRADÓ

[Zoltan Mate <mate AT namafia.atomki.hu>]

Az MTA Atommagkutató Intézetének nagy előadójában
(Debrecen, Bem tér 18/c. 12. ép. III. em.)
2010. június 1-én, KEDDEN 11:00-kor


                N. Itagaki
             (Kyoto University) 

  Specific structure of light neutron-rich nuclei  


címmel előadást tart.
Az előadás előtt 10:30-tól tea.
Vendégeket szívesen látunk.
             
                                        Máté Zoltán



The physics of exotic nuclei is a new and interesting research field. 
Recently many experimental projects to produce neutron- (proton-) rich 
nuclei, which do not exist in nature, are going on. One of the goals of 
such researches is to understand the origin of elements. Also from the 
nuclear structure point of view, the study on neutron-rich nuclei is 
intriguing. Here I raise a question: what is the characteristic structure 
(or excitation mode) of light neutron-rich nuclei? Nuclei are quantum 
many-body systems and each proton and neutron performs independent 
particle motion. This is the standard picture called shell structure, 
however in the excited states, different structure appears: strongly 
correlated nucleons construct subsystems called clusters. In normal 
nuclei, since the relative interactions between clusters are very weak, 
cluster structure appears around the corresponding threshold energy to 
decay into clusters (gas-like cluster state). However in neutron-rich 
nuclei, additional neutrons play a role of glue to stabilize the geometric 
configurations of the clusters. I discuss some examples of geometric 
structure of clusters stabilized by neutrons, for instance linear-chain 
structure of alpha's. 
If there is time remaining, I also discuss a three alpha state around 40Ca 
based on a microscopic alpha-cluster model. Recently, the study on 
gas-like cluster states in N=Z nuclei is extended to the case with core 
nuclei, and a three alpha state around 40Ca core has been pointed out from 
the experimental side. The calculation is performed by introducing a Monte 
Carlo technique for the description of the THSR (Tohsaki Horiuchi Schuck 
Roepke) wave function, which is called the ``virtual THSR" wave function. 
The three alpha cluster state around 40Ca has an energy below the Coulomb 
barrier top energy with a spatial extension comparable to the second 0+ 
state of 12C.  
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