Model Analysis of Time Reversal Symmetry Test in the Caltech Fe-57 Gamma-Transition Experiment

The CALTECH gamma-transition experiment testing time reversal symmetry via the E2/M1 mulipole mixing ratio of the 122 keV gamma-line in Fe-57 has already been performed in 1977. Extending an earlier analysis in terms of an effective one-body potential, this experiment is now analyzed in terms of effective one boson exchange T-odd P-even nucleon nucleon potentials. Within the model space considered for the Fe-57 nucleus no contribution from isovector rho-type exchange is possible. The bound on the coupling strength phi_A from effective short range axial-vector type exchange induced by the experimental bound on sin(eta) leads to phi_A < 10^{-2}.Comment: 5 pages, RevTex 3.

A microscopic classification of high-spin states in 56Fe

A large-scale shell-model calculation on 56Fe including positive parity states with spins up to J = 15 shows that several states in the yrast region may be of a particular nature. These states can be locd in groups of which the gamma decay and quadrupole moments show a collective behaviour. The signature of each group is the f7/2 hole structure. This structure is coupled to a definite Jhole and Thole with the spin Jhole being as large as possible. The level density above the yrast region turns out to be largely independent of J

Children with an Anorectal Malformation Going to Primary School: The Parent’s Perspective

Background: Continence problems occur often in children with anorectal malformations (ARM). The aim of this study was to evaluate parental experiences with toilet facilities at Dutch primary schools and their experience with how schools deal with ARM children. Methods: This survey was developed in collaboration with the national patient advocacy group (PAG). Recruitment for participation was conducted by the PAG (email listing and social media) and one expertise center for ARM. Participants were parents of school-attending ARM children aged 3 to 12 years. Results: Sixty-one participants (31.9%) responded to the survey. The median age of the children was 7.0 years (IQR 5.0–9.0). Schools were often located in a village (63.9%) and encompassed 100–500 children (77.0%). In total, 14 parents (23.0%) experienced difficulties in finding a primary school. Experiences with the school were described as solely positive (37.7%), solely negative (9.8%), positive and negative (34.4%), and neither positive nor negative (16.4%). Regarding school toilet facilities, 65.6% of the toilets were reported clean and 78.7% were easily accessible. Conclusions: About 25% of parents reported difficulties in enrolling their children into primary school, and 45% reported negative experiences. This highlights the need for improved guidance and the optimization of education in schools when dealing with ARM children