Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 32: Struktur und Dynamik von Kernen

HK 32.1: Gruppenbericht

Dienstag, 5. März 2013, 14:00–14:30, HSZ-401

Decay spectroscopy of neutron-rich nuclei around ^37,38Al — •Konrad Steiger — Physik-Department E12, Technische Universität München

An experiment at RIBF (Radioactive Isotope Beam Factory at RIKEN, Japan) investigated N=20 nuclei above ²⁹F and the midshell region around ³⁷Al. These nuclei were produced by relativistic projectile fragmentation of a 345 AMeV ⁴⁸Ca primary beam from the superconducting ring cyclotron SRC with an average intensity of 70 pnA. The secondary cocktail beam was separated and identified with the BigRIPS fragment separator and the ZeroDegree spectrometer. The identified fragments were implanted in the CAITEN detector (Cylindrical Active Implantation Target for Efficient Nuclear-decay study). The main part of this detector is a highly segmented plastic scintillator with the shape of a hollow cylinder. To reduce background decay events the scintillator was moved axially and vertically similar to a tape-transport system. Implantations and decays were correlated in time and space. For the first time β-delayed γ-rays were measured in the neutron-rich isotopes ^37,38Si (with three germanium clover detectors). From β-γ-γ coincidences partial level schemes could be constructed. The results were compared to shell model calculations and a tentative assignment for spins and parities of the experimental level schemes was possible. Significantly more precise half-lives for the implanted nuclei were measured.

Supported by BMBF (06MT9156), DFG (EXC 153, KR2326/2-1), KAKENHI (19340074) and RIKEN President’s Fund (2005).