Investigation of shell structure in exotic nuclei at RIBF in RIKEN, Japan

• Antragsteller: Dr. Roman Gernhäuser, seit 10/2011
• Fachliche Zuordnung: Kern- und Elementarteilchenphysik, Quantenmechanik, Relativitätstheorie, Felder
• Förderung: Förderung von 2009 bis 2014
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 123514553

We propose a project to study some of the central atomic nuclei for the investigation of the evolution of shell structure in nuclei far away from the valley of stability at the new, world leading facility for experiments with radioactive ion beams, the Radioactive Ion Beam Factory (RIBF) at the RIKEN laboratory in Wako, Japan. We will for the first time be able to study the excited states and transition rates in 54Ca and test if this nucleus is indeed doubly magic due to the effects of the tensor component of the nuclear force. With the 10 times higher production rate for 100Sn at RIBF, compared to GSI Darmstadt, it will be possible for the first time to establish excited states in this heaviest N=Z doubly-magic nucleus via isomer decay spectroscopy and to significantly improve the determination of the Gamow-Teller strength in the 100Sn beta decay. For these two experiments beam time has already been approved with high priority at RIBF. In addition we want to study the N=40 nucleus 64Cr that may be at the center of a new ‘island of inversion’ with a deformed ground state (despite its semi-magic neutron number), a result of the residual interaction between the valence nucleons. RIBF has the worldwide highest production yields for these nuclei for the next 3-5 years and is therefore the only facility where these important experiments can be currently performed. With these high-profile experiments we will make major contributions to the understanding of shell structure in nuclei far away from stability.

• DFG-Verfahren: Sachbeihilfen
• Großgeräte: 10 Stck 1 mm thick segmented silicon strip detectors á 5.000 € (+ 19 % MWSt.)
• Gerätegruppe: 0270 Detektoren für Strahlungsmessung, Kernspuremulsionskammern
• Ehemaliger Antragsteller: Professor Dr. Reiner Krücken, bis 10/2011