-
Prof. Stefan Frauendorf (Research Center Dresden-Rossendorf, Germany)03/04/2008, 13:15Exotic deformation / new collective motion at low and high spinInvited PresentationAn overview of selected recent experimental results is given. Their impact on our understanding of nuclear structure is discussed. The following subjects are touched: Termination of regular bands and their recurrance, hyperdeformation, triaxial strongly deformed bands and wobbling, chirality, isospin breaking in mirror nuclei, isomers in the heaviest elements and their implications for...Go to contribution page
-
Dr Rudrajyoti Palit (Tata Institute of Fundamental Research)03/04/2008, 14:00Exotic deformation / new collective motion at low and high spinPresentationThe nuclei in the mass $A\sim130$ region below N = 82 shell closure are soft to gamma-deformation at low and medium spins, and exhibit various intriguing phenomena. Depending upon the coupling of the angular momenta of valance neutrons and protons with that of the even-even core different types of excitations [1 - 4], namely, magnetic rotation, chiral twin bands and recently predicted...Go to contribution page
-
Prof. Umesh Garg (University of Notre Dame)03/04/2008, 14:40
-
Dr Tomokazu Suzuki (Department of Physics, Osaka univ.)03/04/2008, 15:10Exotic deformation / new collective motion at low and high spinPresentationA spontaneous symmetry breaking is a common keyword in modern physics. Chiral symmetry breaking in nuclear structure has recently been debated. This phenomenon is related to time reversal and arises from mutually perpendicular angular momenta of the valence proton, valence neutron, and core rotation in the body fixed frame. The nuclear chirality results in a nearly degenerate pair...Go to contribution page
-
Dr Michael Carpenter (Argonne National Laboratory)03/04/2008, 15:30Exotic deformation / new collective motion at low and high spinInvited PresentationGammasphere has been in operation for over 10 years. In the initial years, it was used almost exclusively to study nuclei produced in fusion evaporation reactions at high spin. For example, successful campaigns to study and characterize superdeformation throughout the nucleonic chart were performed. In recent years, many experiments have been directed at the study of nuclei near the...Go to contribution page
-
Dr Tsuneyasu Morikawa (Department of Physics, Kyushu University)03/04/2008, 16:00Exotic deformation / new collective motion at low and high spinPresentationProgress of the RI beam physics has revealed the new interesting phenomena such as neutron halo and island of inversion. Theoretically, the breakdown of the well-known N = 20 magic number in the island of inversion is interpreted in term of the lowering of 2p-2h energy gap. Experimentally, however, the knowledge on the nuclear structure is so far limited to ground states and lowest-lying...Go to contribution page
-
Dr Hooi Jin Ong (RCNP, Osaka University)05/04/2008, 11:00Collectivities and shell effects in neutron/proton-rich nucleiPresentationThe reduced E2 transition probability from the first excited 2+ (2^+_1) state to the ground state --- B(E2) --- of an even-even nucleus is an important observable that reflects proton collectivity. Recently, an anomalously small B(E2) was reported for the neutron-rich 16C nucleus [1]. The result points to a suppressed proton contribution to the transition strength. This finding raises an...Go to contribution page
-
Dr Paul Fallon (Lawrence Berkeley Laboratory)05/04/2008, 11:20Collectivities and shell effects in neutron/proton-rich nucleiPresentationThe observation of either enhanced or reduced transition strengths (collectivity) can signal unexpected changes in nuclear structure. In light neutron-rich nuclei both phenomena have been reported and both have led to unexpected results and new insights. An example of the former is found in the “island of inversion”. First observed through an increased binding in 31Na, the N=20 isotones...Go to contribution page
-
Dr Zoltan Elekes (MTA ATOMKI)05/04/2008, 11:40Exotic deformation / new collective motion at low and high spinPresentationIn recent years, significantly different contribution of neutrons and protons to the first excited states has been observed in several, light, neutron-rich nuclei. Especially, carbon isotopes have been intensively studied, but 20C, the heaviest isotope reachable with the present experimental facilities, was not investigated. In order to make the measurements complete in the carbon isotopic...Go to contribution page
-
Mr Shinsuke Ota (Center for Nuclear Study, University of Tokyo)05/04/2008, 12:00Collectivities and shell effects in neutron/proton-rich nucleiPresentationWe have measured the proton transfer reaction of $^{4}$He($^{12}$Be,$^{13}$B$\gamma$) with ``Gamma-Ray detector Array with Position and Energy sensitivity (CNS-GRAPE)'' in RIKEN. Analyzing the angular differential cross section, we assigned the $J^{\pi}$ of 4.83~MeV excited state to be $1/2{+}$ with $C^{2}S=0.2$, for the first time. This state is interpreted as a proton intruder state from...Go to contribution page
-
Dr Makito Oi (Department of Physics, University of Surrey)05/04/2008, 15:10Exotic deformation / new collective motion at low and high spinPresentationSuperdeformed states have been populated exclusively with the fusion-evaporation reactions, which is suitable for a productin of very high-spin states. This is possible through neutron evapolations that do not take angular momentum away from the system. However, as a consequence, such a high-spin states can be produced only for neutron-deficient systems. A $N=Z$ nucleus...Go to contribution page
-
Yasutaka TANIGUCHI (Kyoto Univ. (-March, 2008))05/04/2008, 15:30Exotic deformation / new collective motion at low and high spinPresentationWe have studied clustering and deformations in $^{40}$Ca using the antisymmetrized molecular dynamics (AMD) and generator coordinate method (GCM). The GCM basis are obtained by energy variation with two kinds of constraints for clustering and deformations, respectively. Superposing obtained wave functions, which form mean-field-type, $\alpha$-$^{36}$Ar, and $^{12}$C-$^{28}$Si structures,...Go to contribution page
-
Prof. Tadashi Shimoda (Department of Physics, Osaka University)05/04/2008, 15:50Collectivities and shell effects in neutron/proton-rich nucleiPresentationEvolution of shell structures in a wide range of nuclear chart is one of the most important subjects in nuclear physics. In particular, breakdown of the $N=20$ shell closure and onset of collectivity as increasing neutron number in neutron-rich nuclei in the region of so-called ``island of inversion". In spite of intensive investigations for many years, little is known on the...Go to contribution page
Choose timezone
Your profile timezone: