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Author: Thomas Gentile

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1. Comment on "Enhanced polarization and mechanisms in optically pumped hyperpolarized ^u3^He in the presence of ^u4^He"
Published: 7/24/2013
Authors: Thomas R Gentile, M E Hayden, P.J. Nacher, A K. Petukhov, B Saam, T G Walker
Abstract: H.H. Chen et al [1] claim that adding 4He to spin-exchange optical pumping (SEOP) cells confines 3He atoms to a diffusion-limited region, which effectively reduces the wall relaxation factor X. Here X is a phenomenological parameter used to charact ...

2. Wide Angle Polarization Analysis with Neutron Spin Filters
Published: 4/29/2013
Authors: Qiang Ye, Thomas R Gentile, Jeffrey R. Anderson, Collin L. Broholm, Wangchun Chen, Z DeLand, Ross W Erwin, C. B. Fu, John E Fuller III, Aaron V Kirchhoff, J. A. Rodriguez-Rivera, V. Thampy, T G Walker, Shannon M Watson
Abstract: We report substantial improvements in a compact wide angle neutron spin filter system that was recently employed on the Multi-Axis Crystal Spectrometer at the Center for Neutron Research at the U.S. National Institute of Standards and Technology. The ...

3. A gamma and X-ray dector for cryogenic, high magnetic field applications
Published: 7/13/2012
Authors: Thomas R Gentile, R L Cooper, R. Alarcon, M J Bales, E J Beise, H Breuer, J. Byrne, T E. Chupp, Kevin J Coakley, Maynard S Dewey, Changbo Fu, Hans P Mumm, Jeffrey S Nico, Brian O'Neill, K. Pulliam, Alan K Thompson, F E. Wietfeldt
Abstract: As part of an experiment to measure the spectrum of photons emitted in beta-decay of the free neu- tron, we developed and operated a detector consisting of 12 bismuth germanate (BGO) crystals coupled to avalanche photodiodes (APDs). The detector wa ...

4. In-situ Polarized 3He system for the Magnetism Reflectometer at the Spallation Neutron Source
Published: 7/2/2012
Authors: Thomas R Gentile, X Tong, C Y Jiang, V Lauter, H. Ambaye, D. Brown, L Crow, R J Goyette, W-T Lee, A. Parizzi
Abstract: We report on the in-situ polarized 3He neutron polarization analyzer developed for the time-of-flight Magnetism Reflectometer (MAGICS) at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). Using the spin exchange optical ...

5. Response of large area avalanche photodiodes to low energy X-rays
Published: 4/30/2012
Authors: Thomas R Gentile, Uwe Arp, M J Bales, R Farrell
Abstract: For an experiment to study neutron radiative beta-decay, we operated large area avalanche photodiodes (APDs) at liquid nitrogen temperature to detect X-rays with energies between 0.2 keV and 15 keV. Whereas there are numerous reports of X-ray spect ...

6. Comment on "Pressure dependence of wall relaxation in polarized He3 gaseous cells"
Published: 4/26/2012
Authors: Thomas R Gentile, B Saam
Abstract: W. Zheng et al. [Phys. Rev. A 83, 061401(R) (2011)] measure under certain conditions a linear pressure dependence of the wall-induced nuclear relaxation rate of 3He in glass cells typically used to generate and/or store hyperpolarized 3He. Their in ...

7. Friedel-like Oscillations from Interstitial Iron in Superconducting Fe^d1+y^Te^d0.62^Se^d0.38^
Published: 3/7/2012
Authors: V. Thampy, J. Kang, Jose Abelardo Rodriguez, W. Bao, A. T. Savici, J. Hu, T. J. Liu, B. Qian, D. Fobes, Z. Q. Mao, C. B. Fu, Wangchun Chen, Q. Ye, Ross W Erwin, Thomas R Gentile, Z. Tesanovic, Collin L. Broholm
Abstract: Using polarized and unpolarized neutron scattering we show that interstital Fe in superconducting Fe^d1=y^Te^d1-x^Se^dx^ induces a magnetic Friedel-like oscillation that idffracts at {B}Q{/B} = ({1/2}0) and involves {greater than}50 neighboring Fe si ...

8. Constraints on Monopole-Dipole Interactions of Wisps from Polarized Gas Relaxation Time
Published: 8/31/2011
Authors: Changbo Fu, Thomas R Gentile, W M. Snow
Abstract: Various theories beyond the Standard Model predict new particles with masses in the sub-eV range with very weak couplings to ordinary matter. A P-odd, T-odd, spin-dependent interaction between polarized and unpolarized matter is one such possibility. ...

9. Magnetic field effects on large area avalanche photodiodes at cryogenic temperatures
Published: 8/30/2011
Authors: Thomas R Gentile, C. D. Bass, Jeffrey S Nico, H Breuer, R Farrell
Abstract: We present results for detection of X-rays by large area avalanche photodiodes (APDs) in strong magnetic fields and at cryogenic temperatures. Whereas at room temperature we observe essentially no effects on the response, at cryogenic temperature ...

10. Polarized He-3 cell development and application at NIST
Published: 6/14/2011
Authors: Thomas R Gentile, Wangchun Chen, Changbo Fu, Shannon M Watson, G L. Jones, J. W McIver, D. R. (deceased) Rich
Abstract: Over a period of well over a decade, a large number and variety of polarized 3He cells for neutron applications have been developed and tested at the U.S. National Institute of Standards and Technology (NIST). These cells have primarily been employ ...

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