PhD Plaque Ceremony - Hao Lu

Friday, March 29, 2024

3:00 PM4:00 PM


Our celebration of Dr. Hao Lu's successful doctoral dissertation defense, with his supervisor, Dr. Mike Snow.

Dissertation Title: Neutron Birefringence Measurements of 129Xe, 131Xe and 3He


Understanding the spin-dependent neutron scattering lengths of 129Xe and 131Xe is essential for the interpretation of spin-dependent neutron-scattering studies on polarized Xenon ensembles with possible future applications such as tests of time-reversal violation.

I present the first measurements of the spin-dependent incoherent scattering lengths (bi) of 129Xe and 131Xe, along with a fresh independent measurement for 3He for comparison with existing literature. We used the Jülich Neutron Spin Echo (J-NSE) spectroscopy instrument at the FRM II facility in Germany, where the neutron beam traversed nuclear samples with alternating positive and negative polarization states, resulting in a variation in the NSE interference pattern. 

The spin-dependent neutron incoherent scattering lengths measured to be: bi(129Xe)=−0.186±(0.021)stat.±(0.004)syst. fm and bi(131Xe)=2.09±(0.29)stat.±(0.12)syst. fm. Additionally, the incoherent scattering length of 3He was independently determined as: bi(3He)=2.280±0.020(stat.)+0.015(syst.) fm, showing agreement with prior researches within two standard deviations. Further experiments were designed and executed to address this discrepancy.

Please view the slideshow for more images of the ceremony

Hao Lu affixing his plaque to the wall at MESH
Hao cutting his cake
Mike Snow giving an entertaining speech about Hao's time at IU.
Hao Lu & Mike Snow with Hao's new plaque