Nuclear shell evolution towards the"terra incognita"
About the project
The present research project is focused on investigating the shell evolution of rieutroii-ricli nuclei near 78Ni. Information on the shell structure in this mass region is limited due to the fact that 78Ni is the most exotic doubly-inagic nucleus nucleus with its largest neutron-to-proton ratio, ~1.79. In another word, these nuclei are shorter-lived and are located much further from the stability line thus more difficult to access experimentally. Fragmentation or fission of stable projectiles is presently the only approach to observe lim its of existence in these nuclei. The production ofthese nuclei via fragmentation or fission is followed by their in-flight separation and detection in less than l micro seconds time range. There are several radioactive-beam facilities in the world applying this technique: GANIL (France), GSI (Germany), NSCL—MSU (USA), and RIBF—RIKEN (Japan). However, due to the long-term upgrading purposes, only the laboratories at NSCL-MSU, USA and RIBF-RIKEN, Japan are currently available. Therefore, I am planing to perform the experimental activity, described detailed in the '?Project Descriptioifl, in the international large-scale facilities EURlCA/DALI2 and BigRIPS at RIKEN and GRETINA and A1900 at NSCL-MSU. Accurate theoretical calculations from different perspectives in order to define the physics results of the proposal will be an irrefutable gain ofthe collaboration during the project working plan period. In this context, I have established fruitful collaborations with leading theorists in the field of nuclear structure research, in particular with Morten Hjorth-Jensen, who has developed techniques that are highly relevant for the interpretation of experiments along the lines of those addressed in the present proposal. Finally, the presented research project will extend the state of the art and greatly contribute to the scientific excellence and competition.
l)Collective properties in 77Cu as complementary to the previous beta-delayed gamma-ray spectroscopy studies of the Project Manager
2)Understand the Z=28 shell evolution towards the unknown doubly-magic 78Ni region
3)Obtain results on collectivity of exotic nuclei with heavier atomic mass numbers such as: 81As, 80Ge, 79Ga,78Zn.
4)lmprove the microscopic interaction in the fpg shell-model space around the Z=28 N=5O Shell closures
5)Study single-particle structure in neutron~rich Cu nuclei using Zn(d,p)Cu reaction with GRETINA, advanced Germanium array in USA (like AGATA in Europe) and the S800 spectrometer.
1)Perform data taking and analysis of experiments at RIKEN
2)Propose a new exp. for s.p. structure in 75,77Cu at MSU, USA.
3)Perfor1n data taking and analysis of experiment at MSU.
4))Establish a new collaboration between Nuc.Phys. and Theory Groups in Oslo
5)Taking a part of the SEASTAR campa. at RI KEN 6)Publish results in scient. papers
7)Present results in conferences
The Research Council of Norway