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Title: The evaporation signal from [alpha] particles stopped in superfluid helium

Abstract

Alpha particles stopped in a 3 liter volume of liquid helium at 30 mK are observed by the calorimetric detection of helium atoms evaporated from the free surface of the liquid. Quantum evaporation of the helium is produced by the rotons that are created by the [alpha] particle. While the energy spectrum of the 5.5 MeV [alpha]'s from the [sup 241]Am source has a width of less than 0.5%, the energy distribution of the observed evaporation signals extends from the low energy threshold of several keV up to a maximum of several 100 keV, depending on geometrical factors and the collection area of the calorimeter. The origin of the observed distribution may result in part from the presence of the substrate and a dependence on the direction of the track of the [alpha] particle. A simple model of the generation of rotons by the [alpha] particle will be discussed.

Authors:
; ; ; ; ; ; ;  [1]
  1. Brown Univ., Providence, RI (United States)
Publication Date:
OSTI Identifier:
5417443
Report Number(s):
CONF-930751-
Journal ID: ISSN 0022-2291; CODEN: JLTPAC
DOE Contract Number:  
FG02-88ER40452
Resource Type:
Conference
Journal Name:
Journal of Low Temperature Physics; (United States)
Additional Journal Information:
Journal Volume: 93:3-4; Conference: 5. international workshop on low temperature detectors, Berkeley, CA (United States), 29 Jul - 3 Aug 1993; Journal ID: ISSN 0022-2291
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; HELIUM 4; ALPHA DETECTION; EVAPORATION; RADIATION DETECTORS; ENERGY RESOLUTION; TESTING; ROTONS; SUPERFLUIDITY; TEMPERATURE RANGE 0000-0013 K; CHARGED PARTICLE DETECTION; DETECTION; EVEN-EVEN NUCLEI; HELIUM ISOTOPES; ISOTOPES; LIGHT NUCLEI; MEASURING INSTRUMENTS; NUCLEI; PHASE TRANSFORMATIONS; QUASI PARTICLES; RADIATION DETECTION; RESOLUTION; STABLE ISOTOPES; TEMPERATURE RANGE; 440103* - Radiation Instrumentation- Nuclear Spectroscopic Instrumentation

Citation Formats

Bandler, S R, Enss, C, Goldhaber, G, Lanou, R E, Maris, H J, More, T, Porter, F S, and Seidel, G M. The evaporation signal from [alpha] particles stopped in superfluid helium. United States: N. p., 1993. Web.
Bandler, S R, Enss, C, Goldhaber, G, Lanou, R E, Maris, H J, More, T, Porter, F S, & Seidel, G M. The evaporation signal from [alpha] particles stopped in superfluid helium. United States.
Bandler, S R, Enss, C, Goldhaber, G, Lanou, R E, Maris, H J, More, T, Porter, F S, and Seidel, G M. Mon . "The evaporation signal from [alpha] particles stopped in superfluid helium". United States.
@article{osti_5417443,
title = {The evaporation signal from [alpha] particles stopped in superfluid helium},
author = {Bandler, S R and Enss, C and Goldhaber, G and Lanou, R E and Maris, H J and More, T and Porter, F S and Seidel, G M},
abstractNote = {Alpha particles stopped in a 3 liter volume of liquid helium at 30 mK are observed by the calorimetric detection of helium atoms evaporated from the free surface of the liquid. Quantum evaporation of the helium is produced by the rotons that are created by the [alpha] particle. While the energy spectrum of the 5.5 MeV [alpha]'s from the [sup 241]Am source has a width of less than 0.5%, the energy distribution of the observed evaporation signals extends from the low energy threshold of several keV up to a maximum of several 100 keV, depending on geometrical factors and the collection area of the calorimeter. The origin of the observed distribution may result in part from the presence of the substrate and a dependence on the direction of the track of the [alpha] particle. A simple model of the generation of rotons by the [alpha] particle will be discussed.},
doi = {},
journal = {Journal of Low Temperature Physics; (United States)},
issn = {0022-2291},
number = ,
volume = 93:3-4,
place = {United States},
year = {1993},
month = {11}
}

Conference:
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