Multi-particle Emission from ${^{31}}$Ar at ISOLDE

Abstract

A multi-particle decay experiment was successfully performed at the ISOLDE Decay Station. In this new permanent station, devoted to β-decay studies, the novel MAGISOL Si-Plugin Chamber was installed to study the exotic decay modes of the proton drip-line nucleus 31 Ar. The motivation was to search for β3p and β3pγ channels, as well as to provide information on resonances in 30 S and 29 P relevant for the astrophysical rp-process. Description of the experimental set-up and preliminary results are presented.

Near-yrast Excitations in Nucleus $^{83\mskip -\thinmuskip }$As: Tracing the Deformation in the $^{78}$Ni Region

“…In particular, the spin and parity of the 2645 keV level in 20 Na is unsettled. This resonance is situated in the Gamow-window of the 19 Ne(p, γ) 20 Na reaction from the breakout sequence of the CNO cycle. Thus, it is essential to understand the reaction rate.…”

“…The system has been also coupled to the neutron Time-of-Flight array VAN-DLE (Versatile Array for Neutron Detection at Low Energies) this year with great success. Both last year and this year, very exotic neutron-deficient nuclei such as 31 Ar and 20 Mg were measured by detection of charged particles and γ-rays by the using of the MAGISOL Plug-in chamber that contains an array of 5 DSSSD backed by unsegmented Si-pad detectors in ∆E-E telescope configuration, to learn more, see [19]. Geant4 simulation has been done to obtain the efficiencies of the different configurations of this highly performing very versatile set-up.…”

Calibration and response function of a compact silicon-detector set-up for charged-particle spectroscopy using GEANT4

“…In the work presented here, we have adopted a different approach, using a physical rather than mathematical model. To do so, the geometry of the set-up has been implemented with high detail in GEANT4 (version 10.05.p01), including all the physical/geometrical characteristics of each detector and the Standard Electromagnetic Model Option 3 for the electromagnetic interactions 1 . Furthermore, special care has been taken to ensure that the output of the simulations kept exactly the same format as the real measured data, so that the analysis programs to produce the final spectra are the same in both cases.…”

“…The set-up characterised in this work was designed to become a general and compact detection system for β-delayed charged-particle spectroscopy. It has already been used in a few experiments performed at the ISOLDE a e-mail: enrique.nacher@csic.es b e-mail: olof.tengblad@csic.es c Present Address: Centro de Microanálisis de Materiales, Madrid, Spain facility at CERN: first time to study the β-delayed protons of 31 Ar and 33 Ar [1], this was continued with an experiment for a precise study of the β-delayed α -decay of 16 N [2], and also to study the breakup of 8 Be into two alpha particles following the β-decay of 8 B [3] [4]. All experiments were performed at the Isolde Decay Station (IDS) [5].…”

Measurements of Thermal and Resonance Neutron Fluence and Induced Radioactivity Inside Bunkers of Medical Linear Accelerators in the Center of Oncology in Opole, Poland

“…The system has been also coupled to the neutron Time-of-Flight array VAN-DLE (Versatile Array for Neutron Detection at Low Energies) this year with great success. Both last year and this year, very exotic neutron-deficient nuclei such as 31 Ar and 20 Mg were measured by detection of charged particles and γ-rays by the using of the MAGISOL Plug-in chamber that contains an array of 5 DSSSD backed by unsegmented Si-pad detectors in ∆E-E telescope configuration, to learn more, see [19]. Geant4 simulation has been done to obtain the efficiencies of the different configurations of this highly performing very versatile set-up.…”