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The LUX-ZEPLIN (LZ) experiment will enable a neutrinoless double beta decay search in parallel to the main science goal of discovering dark matter particle interactions. We report the expected LZ sensitivity to 136 Xe neutrinoless double beta decay, taking advantage of the significant (>600 kg) 136 Xe mass contained within the active volume of LZ without isotopic enrichment. After 1000 livedays, the median exclusion sensitivity to the half-life of 136 Xe is projected to be 1.06×10 26 years (90% confidence level), similar to existing constraints. We also report the expected sensitivity of a possible subsequent dedicated exposure using 90% enrichment with 136 Xe at 1.06×10 27 years.

The LUX-ZEPLIN dark matter search aims to achieve a sensitivity to the WIMP-nucleon spinindependent cross-section down to (1-2)×10 −12 pb at a WIMP mass of 40 GeV/c 2. This paper describes the simulations framework that, along with radioactivity measurements, was used to support this projection, and also to provide mock data for validating reconstruction and analysis software. Of particular note are the event generators, which allow us to model the background radiation, and the detector response physics used in the production of raw signals, which can be converted into digitized waveforms similar to data from the operational detector. Inclusion of the detector response allows us to process simulated data using the same analysis routines as developed to process the experimental data.

Background: Admission to the university is a new stage of life for students that are generally associated with independence, social activities, and changes in lifestyle and behavior including changes in nutritional habits. Objectives: The study objective was to investigate the lifestyle and major dietary risk factors associated with the development of overweight and obesity among Najran University students, Saudi Arabia. Materials and Methods: 300 undergraduate students attending Najran University completed a self-administered questionnaire on demographic, social, and cultural data, as well as information on eating habits, health and nutritional status. The questionnaire was labeled and coded by the researcher. The data obtained were subjected to analysis using Microsoft Office Excel 2007. Results: Analysis of the dietary habits of the students in the present sample revealed adoption of several undesired dietary habits. Two-thirds of them had between 1 and 2 weekly servings of fruit and vegetables, more than half choosing the less healthy food, fast food in particular, and about one-third only having a regular healthy breakfast on a daily basis. Almost two-thirds (62%) of the students have normal body mass index, almost 14.2% are underweight, 11% are overweight, and 12% are obese. 29% of the students engaged in regular exercise while another 25% stated that they never or hardly ever perform physical exercise. Most students, about 40% go to bed between 1 and 3 am, 47% sleep for <6 h/day, and more than 50% feel that they are not getting enough sleep although 24% always take a nap and 45% take a nap occasionally. Majority of the students did not smoke, with 17.2% of the students being regular smokers. These figures reflect the rather unhealthy dietary and lifestyle patterns of Najran University students in general. Conclusion: This study showed the difficulties that university students encounter, especially when they are away from the family, in following a healthy lifestyle and taking care of themselves from the nutritional point of view. The present data had shown relatively alarming prevalence of overweight/obesity, unhealthy dietary practices, and lifestyle behaviors that should be targeted and modified. This project provides valuable data that could be used by policymakers to address issues concerning students' health.