CGS17

Session

Session 13A

S13A

20 Jul 2023, 16:30

Amphitheater (MAISON MINATEC)

Conveners

Session 13A

• Mathis Wiedeking (iThemba LABS, Cape Town, South Africa University of the Witwatersrand, Johannesburg, South Africa)

31. Lifetime determination of excited states in $^{104}$Ru and $^{130}$Te via a new Doppler-shift attenuation approach

Anna Bohn (University of Cologne, Institute for Nuclear Physics, Germany)

20/07/2023, 16:30

Experimental Techniques

Oral

The Doppler-shift attenuation method after proton scattering is a well-established technique to determine nuclear-level lifetimes in the range of sub-picoseconds [1,2]. In the last years, (p,p’$\gamma$) experiments have been performed using the combined detector array SONIC@HORUS consisting of 14 HPGe detectors and 12 Silicon detectors [3]. Measuring the emitted de-exciting gamma ray as well...

69. Lifetime measurements in $^{129}$Sn

Mr D. Kumar (Variable Energy Cyclotron Centre, Kolkata 700 064, India; Homi Bhabha National Institute, Mumbai 400 094, India)

20/07/2023, 16:45

Experimental Nuclear Structure

Oral

The measurement of level lifetimes around the doubly closed shell nuclei carries extreme importance as they give direct insight into the transition probabilities and thus the understanding of the n-n interaction. The validity of the double shell closure near $^{132}$Sn has been revealed from the study of low lying states of the nuclei which have few proton (neutron) particles (holes) about Z =...

91. Microscopic aspects of $\gamma$-softness in atomic nuclei

Stefan Frauendorf (Department of Physics, University of Notre Dame, Notre Dame,)

20/07/2023, 17:00

Theoretical Nuclear Structure

Oral

How the collective features emerge from the microscopic degrees of freedom is one of the main research themes in quantum many-body systems. Using the microscopic approach of the triaxial projected shell model (TPSM), the authors demonstrate that  admixing few quasiparticle excitations into the vacuum configuration with a fixed triaxiality parameter $\gamma$ provides a quantitative description...

64. Neutron Elastic Scattering Differential Cross Sections on 13C

Jeffrey Vanhoy (US Naval Academy)

20/07/2023, 17:15

Nuclear Reactions

Oral

Neutron elastic scattering cross sections on natural carbon serve as a reference standard in the incident energy range 10 eV to 1.8 MeV. The 2017 standards evaluation [1] is 0.5 to 2.0% higher in that energy range than the 2006 standards evaluation [2]. In addition the ENDF/B-VIII.0 and ENDF-VIII.1 releases split the natural carbon cross sections into the isotopes 12C, 13C, and 14C for the...

92. Measuring and Simulating Capture γ-Ray Spectra using the RPI γ-Multiplicity Detector

Katelyn Cook (Rensselaer Polytechnic Institute)

20/07/2023, 17:30

Nuclear Reactions

Oral

Accurate modeling of neutron induced capture γ-production is essential for reactor and shielding calculations, understanding γ-heating in critical systems, and non-proliferation applications. To determine the accuracy of nuclear data evaluations and simulation tools used to transport capture γ-cascades, the 16-segment γ-multiplicity NaI(Tl) detector at the Rensselaer Polytechnic Institute...

167. Development of active neutron nondestructive assay system

Yosuke Toh (Japan Atomic Energy Agency)

20/07/2023, 17:45

Applications

Oral

There is no acceptable and practicable single nondestructive method for the assay of Special Nuclear Materials (SNM) and Minor Actinides (MA) in highly radioactive nuclear materials, such as those found in spent fuel and MA transmutation fuel. The Japan Atomic Energy Agency (JAEA) and the Joint Research Centre (JRC) of the European Commission have been developing an active neutron...

164. Investigation of excited states in 76As of interest for 0νββ decay

Lorenzo Domenichetti1

20/07/2023, 18:00

Experimental Nuclear Structure

Oral

Since many years the quest for experimental evidences for the neutrino less double beta decay is open.
Such measurement would imply the neutrino being identical to its antiparticle, therefore being a Majorana particle. A measurement of the lifetime for this process would lead to a precise estimation of the neutrino mass. However, very precise nuclear physics data are needed to achieve an...

71. Systematics of the dipole polarizability

Mrs I. Brandherm (Institut für Kernphysik, Technische Universität Darmstadt, Germany )

20/07/2023, 18:15

Experimental Nuclear Structure

Oral

The electric dipole polarizability is a key observable to set constraints to the symmetry energy parameters of the equation of state and the neutron skin thickness of nuclei. The electric dipole response of a nucleus can be probed with inelastic proton scattering at very forward angles and intermediate proton beam energies, where relativistic Coulomb excitation dominates (1). This kinematics...