Coulomb dissociation of N 20,21

Neutron-rich light nuclei and their reactions play an important role in the creation of chemical elements. Here, data from a Coulomb dissociation experiment on N20,21 are reported. Relativistic N20,21 ions impinged on a lead target and the Coulomb dissociation cross section was determined in a kinematically complete experiment. Using the detailed balance theorem, the N19(n,γ)N20 and N20(n,γ)N21 excitation functions and thermonuclear reaction rates have been determined. The N19(n,γ)N20 rate is up to a factor of 5 higher at

Impact of Facilitation in the Learning Process in STEM

The role of facilitator, and facilitation strategies, are components that sometimes get overlooked as important in promoting collaborative interactions, such as with group work. Being able to work effectively in a group is a required skill for most disciplines, in particular for those in the Science, Technology, Engineering and Mathematics (STEM) fields. It is also central throughout the Professional Development Program (PDP) developed and run by the Institute of Scientist and Engineer Educators (ISEE), starting with group formation and leading all the way up to the final culminating activity. As such, PDP teams are taught facilitation strategies. Keeping in mind a group’s goals and what their measures for accountability are, the facilitator should be able to give constructive feedback and actively assess the team’s progress on the go. In this process, the facilitator can identify early on issues that can then be addressed before they become pathological. In this paper, we discuss from our experience as PDP participants and facilitators, what are different spaces we have applied facilitation strategies, what are some of the strategies that have worked throughout the years to improve group work, and what observations from the group help us make the best possible assessment

Recent advances with a hybrid micro-pattern gas detector operated in low pressure H2 and He, for AT-TPC applications

In view of a possible application as a charge-particle track readout for an Active-Target Time Projection Chamber (AT-TPC), the operational properties and performances of a hybrid Micro-Pattern Gaseous Detector (MPGD) were investigated in pure low-pressure Hydrogen (H2) and Helium (He). The detector consists of a MICROMEsh GAseous Structure (MICROMEGAS) coupled to a two-cascade THick Gaseous Electron Multiplier (THGEM) as a pre-amplification stage. This study reports the effective gain dependence of the hybrid-MPGD at relevant pressure (in the range of 200-760 torr) for different detector arrangements. The results of this work are relevant in the field of avalanche mechanism in low-pressure, low-mass noble gases, in particularly for applications of MPGD end-cap readout for active-target Time Projection Chambers (TPC) in the field of nuclear physics and nuclear astrophysics

Recent advances with a hybrid micro-pattern gas detector operated in low pressure H

In view of a possible application as a charge-particle track readout for an Active-Target Time Projection Chamber (AT-TPC), the operational properties and performances of a hybrid Micro-Pattern Gaseous Detector (MPGD) were investigated in pure low-pressure Hydrogen (H2) and Helium (He). The detector consists of a MICROMEsh GAseous Structure (MICROMEGAS) coupled to a two-cascade THick Gaseous Electron Multiplier (THGEM) as a pre-amplification stage. This study reports the effective gain dependence of the hybrid-MPGD at relevant pressure (in the range of 200-760 torr) for different detector arrangements. The results of this work are relevant in the field of avalanche mechanism in low-pressure, low-mass noble gases, in particularly for applications of MPGD end-cap readout for active-target Time Projection Chambers (TPC) in the field of nuclear physics and nuclear astrophysics