We have developed and tested a demonstrator for a neutron backscattering spectrometer with a tenfold enhanced energy resolution. This is made possible by taking advantage of the narrow intrinsic linewidth of the GaAs 200 Bragg reflection, which is one order of magnitude smaller than the linewidth of the currently used Si 111. First measurements yielded an unprecedented energy resolution of 78 neV FWHM, a factor of 10 narrower than the standard Si 111 configuration and about a factor of 4 smaller than the highest energy resolution currently available with Si 111. These measurements provide proof of concept for the construction of a full-scale user instrument.

1.
B.
Frick
, “
Neutron backscattering spectroscopy
,” in
Neutron and X-Ray Spectroscopy
, edited by
F.
Hippert
,
E.
Geissler
,
J.
Hodeau
,
E.
Lelievre-Berna
, and
J.
Regnard
(
Springer Netherlands
,
2006
), pp.
483
527
.
2.
D.
Noferini
 et al,
J. Mater. Chem. A
6
,
7538
7546
(
2018
).
3.
M. K.
Braun
 et al,
J. Phys. Chem. Lett.
8
(
12
),
2590
2596
(
2017
).
4.
M.
Prager
and
A.
Heidemann
,
Chem. Rev.
97
,
2933
2966
(
1997
).
5.
T.
Chatterji
 et al,
J. Phys.: Condens. Matter
24
,
266005
(
2012
).
6.
B.
Alefeld
,
Bayr. Akad. Wiss. Mat-Nat. Kl.
1966
(
11
),
109
(
1967
), http://publikationen.badw.de/en/003384189.
7.
See https://www.ill.eu/users/instruments/instruments-list/in16b/de-scription/instrument-layout/ for information on the IN16B spectrometer (last checked June 6, 2018).
8.
B.
Frick
,
M.
Appel
,
T.
Seydel
,
L.
van Eijck
, and
D.
Bazzoli
, “
IN16B - a versatile high flux neutron backscattering spectrometer
” (unpublished).
9.
B.
Alefeld
 et al,
Naturwissenschaften
56
,
410
412
(
1969
).
10.
K.-D.
Liss
 et al,
Nucl. Instrum. Methods A
335
,
523
527
(
1993
).
11.
B.
Alefeld
 et al,
Physica B
283
,
299
301
(
2000
).
12.
J.
Wuttke
 et al,
Rev. Sci. Instrum.
83
,
075109
(
2012
).
13.
A.
Meyer
 et al,
Rev. Sci. Instrum.
74
,
2759
(
2003
).
14.
N. R.
de Souza
,
Neutron News
27
,
20
(
2016
).
15.
A.
Heidemann
,
Physica B
202
,
207
214
(
1994
).
16.
H.
Rauch
and
D.
Petrascheck
, “
Dynamical neutron diffraction and its application
,” in
Neutron Diffraction
(
Springer-Verlag Berlin, Heidelberg
,
New York
,
1978
), p.
303
.
17.
K.
Kuhlmann
, “
Development and commissioning of a prototype neutron backscattering spectrometer with an energy resolution enhanced by an order of magnitude using GaAs single crystals
,” Ph.D. dissertation (
Friedrich-Alexander University Erlangen-Nürnberg
,
2018
), https://nbn-resolving.de/urn:nbn:de:bvb:29-opus4-94107.
18.
K.
Kuhlmann
 et al, “
Neutron diffraction study of the GaAs 200 reflection with very high precision
” (unpublished).
19.
Dubbel Taschenbuch für den Maschinenbau
, edited by
K.-H.
Grote
and
J.
Feldhusen
(
Springer-Verlag Berlin Heidelberg
,
2014
), Vol. 24.
20.
J. S.
Blakemore
,
J. Appl. Phys.
53
,
R123
R181
(
1982
).
21.
See https://www.henkel-adhesives.com/us/en/product/loctite_5088.html for information on the used glue (last checked June 26, 2018).
22.
M.
Appel
and
B.
Frick
,
Rev. Sci. Instrum.
88
(
3
),
036105
(
2017
).
23.
B.
Frick
 et al,
Nucl. Instrum. Methods A
669
,
7
13
(
2012
).
You do not currently have access to this content.