Quantum polyamorphism in compressed distinguishable helium-4

2021 ◽  
Vol 154 (22) ◽  
pp. 224503
Author(s):  
Kenichi Kinugawa ◽  
Ayumi Takemoto
Keyword(s):  
Helium 4

Elastic electron scattering on helium 4

1965 ◽  
Vol 16 (2) ◽  
pp. 169-170 ◽  
Author(s):  
J.P. Repellin ◽  
P. Lehmann ◽  
J. Lefrançois ◽  
D.B. Isabelle
Keyword(s):  
Electron Scattering ◽  
Elastic Electron ◽  
Elastic Electron Scattering ◽  
Helium 4

scholarly journals Timing Characterization of Helium-4 Fast Neutron Detector with EJ-309 Organic Liquid Scintillator

2018 ◽  
Vol 170 ◽  
pp. 07005 ◽  
Author(s):  
Yinong Liang ◽  
Ting Zhu ◽  
Andreas Enqvist
Keyword(s):  
Fast Neutron ◽  
Time Resolution ◽  
High Speed ◽  
Liquid Scintillator ◽  
Moving Average ◽  
Organic Liquid ◽  
Scintillation Detectors ◽  
Arrival Times ◽  
Helium 4 ◽  
Constant Fraction Discriminator

Recently, the Helium-4 gas fast neutron scintillation detectors is being used in time-sensitive measurements, such time-of-flight and multiplicity counting. In this paper, a set of time aligned signals was acquired in a coincidence measurement using the Helium-4 gas detectors and EJ-309 liquid scintillators. The high-speed digitizer system is implanted with a trigger moving average window (MAW) unit combing with its constant fraction discriminator (CFD) feature. It can calculate a “time offset” to the timestamp value to get a higher resolution timestamp (up to 50 ps), which is better than the digitizer's time resolution (4 ns) [1]. The digitized waveforms were saved to the computer hard drive and post processed with digital analysis code to determine the difference of their arrival times. The full-width at half-maximum (FWHM) of the Gaussian fit was used as to examine the resolution. For the cascade decay of Cobalt-60 (1.17 and 1.33 MeV), the first version of the Helium-4 detector with two Hamamatsu R580 photomultipliers (PMT) installed at either end of the cylindrical gas chamber (20 cm in length and 4.4 cm in diameter) has a time resolution which is about 3.139 ns FWHM. With improved knowledge of the timing performance, the Helium-4 scintillation detectors are excellent for neutron energy spectrometry applications requiring high temporal and energy resolutions.

Superfluidity of helium-4 around a Mg11 cluster

2014 ◽  
Vol 68 (12) ◽  
Author(s):  
Johannes Höller ◽  
Eckhard Krotscheck ◽  
Robert E. Zillich
Keyword(s):  
Helium 4
Sign in / Sign up

Export Citation Format

Share Document