Gamma ray detection with CHIMERA at LNS: results and perspectives

G Cardella ,G Politi ,D J Marín-Lámbarri ,B Gnoffo ,L Quattrocchi ,M V Andrés ,Francesca Rizzo ,E Geraci ,A Trifirò ,D Santonocito ,E V Pagano ,M Papa ,P Russotto ,A Pagano ,A Nannini ,N S Martorana ,F Favela ,G Lanzalone ,A Camaiani ,S Pirrone ,N Gelli ,C Maiolino ,V L Sicari ,L Acosta ,C Guazzoni ,E Pollacco ,S De Luca ,E De Filippo ,E G Lanza ,M Trimarchi

doi:10.1088/1742-6596/1561/1/012007

Abstract

We describe the use of the 4tt CHIMERA charged particle detector as a large efficiency y-ray detector. The CsI(Tl) stage of the CHIMERA telescope is used to detect and identify y-rays. The high detection efficiency and the sufficient energy resolution guaranteed by CsI(Tl) allows us to use the detector for the study of rare decays. Two examples are reported: the low probability gamma decay (<10%) of the Pygmy resonance of a radioactive nucleus as the 68Ni; the measurement of the gamma decay probability of excited levels of 12C as the Hoyle state at 7.65 (∼10−4) MeV and the 3- level at 9.64 MeV (∼107), both important for the Carbon production in stars. Future experiments made possible at INFN-LNS by the availability of the new fragment separator FRAISE are also outlined.

Highlights

CHIMERA [1] is a charged particle 4 detector for heavy ions
The high detection efficiency and the sufficient energy resolution guaranteed by CsI(Tl) allows us to use the detector for the study of rare decays
The CsI(Tl) stage of the telescope is sensitive to both gamma rays and neutrons, in particular gamma rays are identified via pulse shape analysis of the signal [2]

Summary

Introduction

CHIMERA [1] is a charged particle 4 detector for heavy ions. It was installed at INFN-LNS Catania since the beginning of this century. The high detection efficiency and the sufficient energy resolution guaranteed by CsI(Tl) for gamma rays allow us to use the detector for the study of rare decays.

Results

Conclusion