skip to main content

DOE PAGESDOE PAGES

Title: Total cross sections for ultracold neutrons scattered from gases

Here, we have followed up on our previous measurements of upscattering of ultracold neutrons (UCNs) from a series of gases by making measurements of total cross sections on the following gases hydrogen, ethane, methane, isobutene, n-butane, ethylene, water vapor, propane, neopentane, isopropyl alcohol, and 3He. The values of these cross sections are important for estimating the loss rate of trapped neutrons due to residual gas and are relevant to neutron lifetime measurements using UCNs. The effects of the UCN velocity and path-length distributions were accounted for in the analysis using a Monte Carlo transport code. Results are compared to our previous measurements and with the known absorption cross section for 3He scaled to our UCN energy. We find that the total cross sections for the hydrocarbon gases are reasonably described by a function linear in the number of hydrogen atoms in the molecule.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [2] ; ORCiD logo [1] ;  [2] ; ORCiD logo [1] ;  [3] ;  [2] ; ORCiD logo [1] ;  [4] ;  [5] ;  [2] ; ORCiD logo [1] ;  [1] ;  [1] ; ORCiD logo [1] ;  [1] more »; ORCiD logo [1] ;  [1] ;  [6] ; ORCiD logo [1] ;  [7] ; ORCiD logo [1] ;  [2] ;  [1] ; ORCiD logo [1] ;  [3] ;  [1] ;  [8] ;  [2] ;  [8] « less
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Indiana Univ., Bloomington, IN (United States)
  3. North Carolina State Univ., Raleigh, NC (United States)
  4. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  5. Indiana Univ., Bloomington, IN (United States); Tennessee Technological Univ., Cookeville, TN (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Indiana Univ., Bloomington, IN (United States)
  7. Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation)
  8. North Carolina State Univ., Raleigh, NC (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-16-25127
Journal ID: ISSN 2469-9985; PRVCAN; TRN: US1700912
Grant/Contract Number:
AC52-06NA25396; 2015LANLE9BU; FG02-97ER41042
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 95; Journal Issue: 1; Journal ID: ISSN 2469-9985
Publisher:
APS
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Atomic and Nuclear Physics; ultra cold neutrons; neutron lifetime
OSTI Identifier:
1345158
Alternate Identifier(s):
OSTI ID: 1341921