Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Struktur und Dynamik von Kernen

HK 48.8: Talk

Thursday, March 20, 2014, 18:45–19:00, HZ 4

Search for beta-delayed protons from ¹¹Be — •Oliver Forstner for the IS541 collaboration — VERA Laboratory, University of Vienna, Austria — Stefan-Meyer-Institut, Austrian Academy of Sciences, Vienna, Austria — CERN, Geneva, Switzerland

The one-neutron halo nucleus ¹¹Be can emit a proton in a beta decay of the halo neutron. However, due to the Q-value of this decay channel (280.7±0.3 keV) the expected branching ratio will be very low – most estimates are a few times 10⁻⁸ – and the detection of the outgoing proton with a kinetic energy of a few hundred keV is challenging. Therefore our attempt was to detect the remaining nucleus ¹⁰Be with the help of accelerator mass spectrometry (AMS). AMS is a highly sensitive tool to detect radioisotopes at the ultra-trace level. A beam of ¹¹Be ions was produced at the ISOLDE facility at CERN and implanted in a collection sample. The sample was transferred to the VERA AMS facility at the University of Vienna where the ¹⁰Be content was determined. In my talk I will present details of the experiment and results of the successful detection of this rare decay channel.