4th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 59, Number 10
Tuesday–Saturday, October 7–11, 2014;
Waikoloa, Hawaii
Session FA: Frontiers of Gamma-Ray Spectroscopy
9:00 AM–11:15 AM,
Friday, October 10, 2014
Room: Kohala 1
Chair: Mark Riley, Florida State University
Abstract ID: BAPS.2014.HAW.FA.4
Abstract: FA.00004 : Highlights of EURICA decay spectroscopy at RIBF
10:45 AM–11:15 AM
Preview Abstract
Abstract
Author:
Hiroshi Watanabe
(Beihang University / RIKEN)
Gamma-ray spectroscopy following the $\beta $ decay is an effective tool for
probing low-lying yrast and non-yrast states, from which key information on
nuclear structure, such as shape transitions/coexistence and single-particle
orbits, can be obtained. For the study of rare isotopes, especially when the
nucleus of interest lies at the boundaries of availability for spectroscopic
studies, isomeric decays are likely to be a more useful means than $\beta $
decays to populate excited levels. The combined $\beta $-$\gamma $ and
isomeric-decay measurements at RIBF, which has the capability of providing
the world's strongest RI beams, are at the forefront of exploration of
exotic nuclei far from stability.
Research opportunities for decay spectroscopy at RIBF can be expanded in the
EURICA (\underline {EU}ROBALL-\underline {RI}KEN \underline {C}luster
\underline {A}rray) project. The main body of EURICA consists of 12
Cluster-type HPGe detectors, surrounding a highly segmented silicon stopper
system named WAS3ABi. In addition to the normal EURICA setup, 18
LaBr$_{\mathrm{3}}$ detectors and plastic scintillators are installed for
the fast-timing measurement of $\gamma $ and $\beta $ rays, respectively.
The aim of EURICA is to pin down currently controversial subjects in nuclear
physics and nuclear astrophysics, such as the evolution of shell structures
that can lead to the appearance or disappearance of the \textit{spherical} magic numbers, the
effect of weak binding and pairing in largely diffused neutron densities,
search for stable oblate, triaxial, and higher-order deformations at low
excitation energy, and the decay properties of neutron-rich isotopes
relevant to the r-process nucleosynthesis. A wide range of unstable nuclei
on the Segre chart are within the scope of EURICA. In this presentation, the
results of the EURICA experimental campaigns in 2012-2013 will be
introduced, highlighting $\gamma $-ray spectroscopy of exotic nuclei in the
vicinity of doubly magic $^{\mathrm{78}}$Ni and $^{\mathrm{100,132}}$Sn, and
neutron-rich mid-shell $^{\mathrm{110}}$Zr and Z $\approx $ 60.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2014.HAW.FA.4