L. Al Ayoubi: "Beta Decays of 82,83 Ga Studied at the ALTO Facility Using
Beta decays of 82,83 Ga studied at the ALTO facility using the PARIS array
L. Al Ayoubi,1 I. Matea,1 A. Kankainen,2 D. Verney,1 H. Al Falou,3 G. Benzoni,4 V. Bozkurt,5 M. Ciemala,6 C. Delafosse,1 I. Deloncle,1 F. DidierJean,7 M. Fallot,8 A. Gottardo,9 V. Guadilla,8 K. Hadyńska-Klęk,10 F. Leblanc,1 T. Martı́nez,11 P. Napiorkowski,12 Yu. G. Sobolev,13 B. Sowicki,6 S. Stukalov,13 D. Thisse1.
1 IJCLab-Laboratoire de Physique des 2 Infinis Irène Joliot Curie, Orsay, France 2 Department of Physics, University of Jyväskylä, Finland 3 Faculty of Sciences 3, Lebanese University, Michel Slayman Tripoli Campus, Ras Maska 1352, Lebanon 4 INFN, sezione di Milano, Dipartamiento di Fisica, Milano, Italy 5 Nigde University, Science Faculty, Department of Physics, Nigde, Turkey 6 Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland 7 IPHC UMR 7178, CNRS/IN2P3, F-67037 Strasbourg, France 8 Subatech, CNRS/IN2P3, Nantes, EMN, F-44307, Nantes, France 9 Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy 10 Department of Physics, University of Oslo, Oslo, Norway. 11 Centro de Investigaciones Energeticas Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain 12 Heavy Ion Laboratory, University of Warsaw, 02-093 Warsaw, Poland 13 Joint Institute for Nuclear Research, Dubna, Russia
The study of properties of neutron-rich nuclei, such as their masses, β-decay half-lives, and β-delayed neutron emission probabilities, provides important inputs for the astrophysical rapid neutron capture (r)- process calculations [1]. The neutron-capture rates are also crucial for the r-process modeling, and a good understanding of the γ-strength function is needed [2]. The β-decay of neutron-rich nuclei can populate high-energy states, above the neutron separation energy, that can compete with delayed neutron emission. A recent experiment performed at the ALTO facility reported an unexpectedly high energy (5 to 9 MeV) γ-ray yield of 16(4) % coming from states several MeVs above the neutron separation threshold in the beta decay of 83 Ga [3]. In this contribution, I will discuss a recent experiment on β-decays of 82,83 Ga. Photofission of uranium, using a 50-MeV electron beam on a UCx target, together with laser ionization was employed to produce the neutron-rich Ga beams. The experimental setup was composed of PARIS clusters (Photon Array for studies with Radioactive Ions and Stable beams) [4] for high-energy γ detection with an efficiency of about 8% at 10 MeV, combined with a plastic detector for betas used for tagging the decay events, a segmented Clover detector and a HPGe detector for the measurement of low excited states in coincidence with the high-energy γ-transitions. In this contribution, the experiment together with preliminary results will be presented. The data analysis is still in progress.
[1] M.R.Mumpower et al., Prog. Part. Nucl. Phys. 86, 86 (2016) [2] A.C Larsen et al., Prog. Part. Nucl. Phys. 107, 69 (2019) [3] A. Gottardo et al, Phys. Lett. B 772, 359 (2017) [4] http://paris.ifj.edu.pl/index.php?lng=en