The low-temperature rate of electron capture beta decay in magnetic materials

1996 ◽  
Vol 79 (8) ◽  
pp. 5716
Author(s):  
L. M. Folan ◽  
V. I. Tsifrinovich ◽  
V. A. Sheverev
Keyword(s):  
Low Temperature ◽  
Magnetic Materials ◽  
Electron Capture ◽  
Beta Decay ◽  
Temperature Rate

High Temperature Lithium Alloy Cells With Improved Low Temperature Performance

2010 ◽  
Vol 2010 (HITEC) ◽  
pp. 000274-000279
Author(s):  
Arden P. Johnson ◽  
Cuiyang Wang ◽  
John S. Miller
Keyword(s):  
Low Temperature ◽  
Rate Capability ◽  
Cell Types ◽  
Chloride Cells ◽  
Ambient Temperatures ◽  
Lithium Alloy ◽  
Temperature Performance ◽  
Temperature Capability ◽  
Low Temperature Performance ◽  
Temperature Rate

Lithium-thionyl chloride cells are widely used in downhole applications where the temperatures exceed 100°C. These cells cannot be used above the melting point of lithium, 180°C, but modified oxyhalide cells are available that use higher-melting lithium alloy anodes that allow safe operation at temperatures as high as 200°C. However, the higher temperature capability comes at the cost of low temperature performance; the alloy cells typically show very poor rate capability below 50°C. The low temperature rate limitations can be particularly disadvantageous in cases where a tool is started up at the surface, where the ambient temperatures are cooler, before it is placed into operation downhole. Here we present test results defining and characterizing the capabilities and limitations of various types of lithium alloy cells at lower temperatures, as well as discharge results at higher temperatures for new cell types that have been designed for improved rate capability at both lower and higher temperatures.

Impacts of water temperature on the physiology and behaviours of the sea urchins Heliocidaris crassispina and Mesocentrotus nudus that reflect their range extension and disappearance in the Oga Peninsula, northern Honshu, Japan

2020 ◽  
Author(s):  
Wenping Feng ◽  
Nobuyasu Nakabayashi ◽  
Eri Inomata ◽  
Masakazu N. Aoki ◽  
Yukio Agatsuma
Keyword(s):  
Low Temperature ◽  
Native Species ◽  
Feeding Rate ◽  
Sea Urchins ◽  
Temperature Limit ◽  
Feeding Rates ◽  
Righting Response ◽  
Mesocentrotus Nudus ◽  
Temperature Rate ◽  
High Or Low Temperature

Ocean warming has facilitated the extension of Heliocidaris crassispina to Oga Peninsula, Japan, where the native species Mesocentrotus nudus has disappeared. To verify the temperature impacts on the physiology and behaviour of the two species, we reared small sea urchins at the increasing/decreasing temperature rate of 2.5°C week-1. The righting response, lantern reflex, gonad and gut carbon (C) and nitrogen (N) contents, and feeding rate were investigated. The high and low temperature limits of H. crassispina were 33.3°C and 3.9°C, respectively, which were higher than those of M. nudus. The optimal temperature ranges for behaviour and feeding in H. crassispina were 10.3–31.0°C and 10.3–33.4°C, respectively, which were higher than those in M. nudus. Feeding rates decreased significantly in both species when the temperature approached the high or low temperature limit, but the gut C and N contents of were not greatly affected. At 26–31°C, the feeding rate significantly decreased in M. nudus but not in H. crassispina, which may explain the replacement of M. nudus by H. crassispina in the Oga Peninsula.

scholarly journals Search for Double Beta Decay of 106Cd with an Enriched 106CdWO4 Crystal Scintillator in Coincidence with CdWO4 Scintillation Counters

Universe ◽  
2020 ◽  
Vol 6 (10) ◽  
pp. 182
Author(s):  
Pierluigi Belli ◽  
R. Bernabei ◽  
V.B. Brudanin ◽  
F. Cappella ◽  
V. Caracciolo ◽  
...  
Keyword(s):  
Electron Capture ◽  
Beta Decay ◽  
Ground State ◽  
Half Life ◽  
Double Beta Decay ◽  
Cadmium Tungstate ◽  
Positron Emission ◽  
Double Electron ◽  
Theoretical Predictions ◽  
Crystal Scintillator

Studies on double beta decay processes in 106Cd were performed by using a cadmium tungstate scintillator enriched in 106Cd at 66% (106CdWO4) with two CdWO4 scintillation counters (with natural Cd composition). No effect was observed in the data that accumulated over 26,033 h. New improved half-life limits were set on the different channels and modes of the 106Cd double beta decay at level of limT1/2∼1020−1022 yr. The limit for the two neutrino electron capture with positron emission in 106Cd to the ground state of 106Pd, T1/22νECβ+≥2.1×1021 yr, was set by the analysis of the 106CdWO4 data in coincidence with the energy release 511 keV in both CdWO4 counters. The sensitivity approaches the theoretical predictions for the decay half-life that are in the range T1/2∼1021−1022 yr. The resonant neutrinoless double-electron capture to the 2718 keV excited state of 106Pd is restricted at the level of T1/20ν2K≥2.9×1021 yr.

scholarly journals Electron capture beta decay of partially polarized nuclei

2019 ◽  
Vol 34 (17) ◽  
pp. 1950129
Author(s):  
R. Basak ◽  
V. I. Tsifrinovich
Keyword(s):  
Hyperfine Field ◽  
Electron Capture ◽  
Beta Decay ◽  
Neutrino Radiation ◽  
Simplifying Assumptions ◽  
Ferromagnetic Substance ◽  
Neutrino Propagation

In this paper, we compute the spin excess for the neutrinos radiated in the process of electron capture beta decay of partially polarized nuclei. The results of computation are presented for the [Formula: see text] nuclei polarized by the strong hyperfine field in a ferromagnetic substance. This system was suggested as a possible source of monoenergetic neutrino radiation with a preferable direction of neutrino propagation. We directly compute the spin excess of radiated neutrinos and show that it is slightly greater than that estimated previously under simplifying assumptions.

Anelastic Effects on Martensitic Carbon Steels during First Stage of Tempering

2012 ◽  
Vol 184 ◽  
pp. 221-226 ◽  
Author(s):  
J.J. Hoyos ◽  
A.A. Ghilarducchi ◽  
H.R. Salva ◽  
J.M. Vélez
Keyword(s):  
Carbon Steel ◽  
Low Temperature ◽  
Internal Friction ◽  
Relaxation Process ◽  
Forced Vibration ◽  
Carbide Precipitation ◽  
Carbon Steels ◽  
Deformation Amplitude ◽  
Temperature Rate ◽  
Internal Friction Spectrum

The evolution of martensitic carbon steel during low temperature tempering was studied using internal friction. The steel containing 0.71wt.% carbon was heated at 1093K for 5min and then rapidly cooled into water (quenched), and tempered for 10 min at 340, 380, 420 and 460K. Additionally, other samples were tempered at 380K for 1 and 20 hours. Internal friction was measured by using a forced vibration pendulum, in a temperature range from 300 to 600K, with deformation amplitude 3 x 10-6 and temperature rate of 0.8 K/min. The internal friction spectrum is decomposed into three Debye peaks: P1 at 380K, P2 at 420K and P3 at 480K, for 3 Hz. P1 is attributed to the epsilon carbide precipitation. P2 and P3 are associated to the dislocation relaxation process. P2 appears when dislocations are pinning with epsilon carbide and P3 appears when dislocations are pinning with cementite carbide.

Cross sections and low temperature rate coefficients for the H + CH+reaction: a quasiclassical trajectory study

2007 ◽  
Vol 9 (5) ◽  
pp. 582-590 ◽  
Author(s):  
Philippe Halvick ◽  
Thierry Stoecklin ◽  
Pascal Larrégaray ◽  
Laurent Bonnet
Keyword(s):  
Low Temperature ◽  
Cross Sections ◽  
Rate Coefficients ◽  
Temperature Rate

scholarly journals Improved low-temperature rate constants for rotational excitation of CO by H$_\mathsf{2}$

2006 ◽  
Vol 446 (1) ◽  
pp. 367-372 ◽  
Author(s):  
M. Wernli ◽  
P. Valiron ◽  
A. Faure ◽  
L. Wiesenfeld ◽  
P. Jankowski ◽  
...  
Keyword(s):  
Low Temperature ◽  
Rate Constants ◽  
Rotational Excitation ◽  
Temperature Rate
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