Search for E1 strength in 62,64Fe around the threshold

11th International Spring Seminar on Nuclear Physics: Shell Model and Nuclear Structure – achievements of the past two decades

Wieland, O.^1,2 ; Bracco, A.^1,2 ; Camera, F.^1,2 ; Avigo, R.^1,2

INFN Sez. di MILANO, Italy^1

Università Degli Studi di MILANO, Italy^2

关键词: Coulomb excitation;    Fragment separators;    Limited information;    Neutron-rich nuclei;    Particle separation;    Pygmy dipole resonances;    Segmented HPGe detectors;    Strength distribution;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/580/1/012058/pdf
DOI  :  10.1088/1742-6596/580/1/012058

来源: IOP

【 摘 要 】

The structure and nature of the pygmy dipole resonance (PDR) states below and above the neutron threshold is a recent open problem, particularly in exotic, neutron rich nuclei. Present experimental observations give only limited information on this subject. New experiments using different methods are needed. A recent measurement at the GSI laboratories on62,64Fe with the PRESPEC (2014) setup, following a past experiment with the RISING (2005) setup on68Ni, will contribute to solve the open questions. The setup located at GSI consists of the segmented HPGe detector array AGATA, scintillators (HECTOR), an Energy Loss / Total Energy time of flight measuring detector system called LYCCA and the fragment separator (FRS) apparatus. The experiment is based on relativistic Coulomb excitation together with the detection of the incoming and outgoing particles event by event. The detection of the produced y-rays in the reactions, provides insight into the problem of the electric dipole response and E1 strength distribution around particle separation threshold.