Upscattering of ultracold neutrons from the polymer [C6H 12]n

E. I. Sharapov; C. L. Morris; M. Makela; A. Saunders; Evan R. Adamek; L. J. Broussard; C. B. Cude-Woods; Deion E. Fellers; Peter Geltenbort; M. Hartl; S. I. Hasan; K. P. Hickerson; G. Hogan; A. T. Holley; C. M. Lavelle; Chen Yu Liu; M. P. Mendenhall; J. Ortiz; R. W. Pattie; D. G. Phillips; J. Ramsey; D. J. Salvat; S. J. Seestrom; E. Shaw; Sky Sjue; W. E. Sondheim; B. Vorndick; Z. Wang; T. L. Womack; A. R. Young; B. A. Zeck

doi:10.1103/PhysRevC.88.064605

Upscattering of ultracold neutrons from the polymer [C⁶H ¹²]ⁿ

E. I. Sharapov, C. L. Morris, M. Makela, A. Saunders, Evan R. Adamek, L. J. Broussard, C. B. Cude-Woods, Deion E. Fellers, Peter Geltenbort, M. Hartl, S. I. Hasan, K. P. Hickerson, G. Hogan, A. T. Holley, C. M. Lavelle, Chen Yu Liu, M. P. Mendenhall, J. Ortiz, R. W. Pattie, D. G. PhillipsJ. Ramsey, D. J. Salvat, S. J. Seestrom, E. Shaw, Sky Sjue, W. E. Sondheim, B. Vorndick, Z. Wang, T. L. Womack, A. R. Young, B. A. Zeck

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Abstract

It is generally accepted that the main cause of ultracold neutron (UCN) losses in storage traps is upscattering to the thermal energy range by hydrogen adsorbed on the surface of the trap walls. However, the data on which this conclusion is based are poor and contradictory. Here we report a measurement, performed at the Los Alamos National Laboratory UCN source, of the average energy of the flux of upscattered neutrons after the interaction of UCN with hydrogen bound in the semicrystalline polymer PMP (trade name TPX), [C ⁶H¹²]ⁿ. Our analysis, performed with the mcnp code which applies the neutron-scattering law to UCN upscattered by bound hydrogen in semicrystalline polyethylene, [C²H⁴] ⁿ, leads us to a flux average energy value of 26±3 meV, in contradiction to previously reported experimental values of 10 to 13 meV and in agreement with the theoretical models of neutron heating implemented in mcnp.

Original language	English
Article number	064605
Journal	Physical Review C - Nuclear Physics
Volume	88
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.88.064605
State	Published - Dec 6 2013
Externally published	Yes

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Sharapov, E. I., Morris, C. L., Makela, M., Saunders, A., Adamek, E. R., Broussard, L. J., Cude-Woods, C. B., Fellers, D. E., Geltenbort, P., Hartl, M., Hasan, S. I., Hickerson, K. P., Hogan, G., Holley, A. T., Lavelle, C. M., Liu, C. Y., Mendenhall, M. P., Ortiz, J., Pattie, R. W., ... Zeck, B. A. (2013). Upscattering of ultracold neutrons from the polymer [C⁶H ¹²]ⁿ. Physical Review C - Nuclear Physics, 88(6), Article 064605. https://doi.org/10.1103/PhysRevC.88.064605

@article{7ec0418747084ec1a7c456cee106ebb3,

title = "Upscattering of ultracold neutrons from the polymer [C6H 12]n",

abstract = "It is generally accepted that the main cause of ultracold neutron (UCN) losses in storage traps is upscattering to the thermal energy range by hydrogen adsorbed on the surface of the trap walls. However, the data on which this conclusion is based are poor and contradictory. Here we report a measurement, performed at the Los Alamos National Laboratory UCN source, of the average energy of the flux of upscattered neutrons after the interaction of UCN with hydrogen bound in the semicrystalline polymer PMP (trade name TPX), [C 6H12]n. Our analysis, performed with the mcnp code which applies the neutron-scattering law to UCN upscattered by bound hydrogen in semicrystalline polyethylene, [C2H4] n, leads us to a flux average energy value of 26±3 meV, in contradiction to previously reported experimental values of 10 to 13 meV and in agreement with the theoretical models of neutron heating implemented in mcnp.",

author = "Sharapov, {E. I.} and Morris, {C. L.} and M. Makela and A. Saunders and Adamek, {Evan R.} and Broussard, {L. J.} and Cude-Woods, {C. B.} and Fellers, {Deion E.} and Peter Geltenbort and M. Hartl and Hasan, {S. I.} and Hickerson, {K. P.} and G. Hogan and Holley, {A. T.} and Lavelle, {C. M.} and Liu, {Chen Yu} and Mendenhall, {M. P.} and J. Ortiz and Pattie, {R. W.} and Phillips, {D. G.} and J. Ramsey and Salvat, {D. J.} and Seestrom, {S. J.} and E. Shaw and Sky Sjue and Sondheim, {W. E.} and B. Vorndick and Z. Wang and Womack, {T. L.} and Young, {A. R.} and Zeck, {B. A.}",

year = "2013",

month = dec,

day = "6",

doi = "10.1103/PhysRevC.88.064605",

language = "English",

volume = "88",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

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Sharapov, EI, Morris, CL, Makela, M, Saunders, A, Adamek, ER, Broussard, LJ, Cude-Woods, CB, Fellers, DE, Geltenbort, P, Hartl, M, Hasan, SI, Hickerson, KP, Hogan, G, Holley, AT, Lavelle, CM, Liu, CY, Mendenhall, MP, Ortiz, J, Pattie, RW, Phillips, DG, Ramsey, J, Salvat, DJ, Seestrom, SJ, Shaw, E, Sjue, S, Sondheim, WE, Vorndick, B, Wang, Z, Womack, TL, Young, AR & Zeck, BA 2013, 'Upscattering of ultracold neutrons from the polymer [C⁶H ¹²]ⁿ', Physical Review C - Nuclear Physics, vol. 88, no. 6, 064605. https://doi.org/10.1103/PhysRevC.88.064605

TY - JOUR

T1 - Upscattering of ultracold neutrons from the polymer [C6H 12]n

AU - Sharapov, E. I.

AU - Morris, C. L.

AU - Makela, M.

AU - Saunders, A.

AU - Adamek, Evan R.

AU - Broussard, L. J.

AU - Cude-Woods, C. B.

AU - Fellers, Deion E.

AU - Geltenbort, Peter

AU - Hartl, M.

AU - Hasan, S. I.

AU - Hickerson, K. P.

AU - Hogan, G.

AU - Holley, A. T.

AU - Lavelle, C. M.

AU - Liu, Chen Yu

AU - Mendenhall, M. P.

AU - Ortiz, J.

AU - Pattie, R. W.

AU - Phillips, D. G.

AU - Ramsey, J.

AU - Salvat, D. J.

AU - Seestrom, S. J.

AU - Shaw, E.

AU - Sjue, Sky

AU - Sondheim, W. E.

AU - Vorndick, B.

AU - Wang, Z.

AU - Womack, T. L.

AU - Young, A. R.

AU - Zeck, B. A.

PY - 2013/12/6

Y1 - 2013/12/6

N2 - It is generally accepted that the main cause of ultracold neutron (UCN) losses in storage traps is upscattering to the thermal energy range by hydrogen adsorbed on the surface of the trap walls. However, the data on which this conclusion is based are poor and contradictory. Here we report a measurement, performed at the Los Alamos National Laboratory UCN source, of the average energy of the flux of upscattered neutrons after the interaction of UCN with hydrogen bound in the semicrystalline polymer PMP (trade name TPX), [C 6H12]n. Our analysis, performed with the mcnp code which applies the neutron-scattering law to UCN upscattered by bound hydrogen in semicrystalline polyethylene, [C2H4] n, leads us to a flux average energy value of 26±3 meV, in contradiction to previously reported experimental values of 10 to 13 meV and in agreement with the theoretical models of neutron heating implemented in mcnp.

AB - It is generally accepted that the main cause of ultracold neutron (UCN) losses in storage traps is upscattering to the thermal energy range by hydrogen adsorbed on the surface of the trap walls. However, the data on which this conclusion is based are poor and contradictory. Here we report a measurement, performed at the Los Alamos National Laboratory UCN source, of the average energy of the flux of upscattered neutrons after the interaction of UCN with hydrogen bound in the semicrystalline polymer PMP (trade name TPX), [C 6H12]n. Our analysis, performed with the mcnp code which applies the neutron-scattering law to UCN upscattered by bound hydrogen in semicrystalline polyethylene, [C2H4] n, leads us to a flux average energy value of 26±3 meV, in contradiction to previously reported experimental values of 10 to 13 meV and in agreement with the theoretical models of neutron heating implemented in mcnp.

UR - http://www.scopus.com/inward/record.url?scp=84891811957&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.88.064605

DO - 10.1103/PhysRevC.88.064605

M3 - Article

AN - SCOPUS:84891811957

SN - 0556-2813

VL - 88

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 6

M1 - 064605

ER -

Upscattering of ultracold neutrons from the polymer [C⁶H ¹²]ⁿ

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