Proton polarization from π+ absorption in 4He

J. Aclander; S. MayTal-Beck; A. Altman; D. Ashery; H. Hahn; M. A. Moinester; A. Rahav; A. Feltham; G. Jones; M. Pavan; M. Sevior; D. Hutcheon; D. Ottewell; G. R. Smith; J. A. Niskanen

doi:10.1016/0370-2693(93)90741-Y

Proton polarization from π⁺ absorption in ⁴He

J. Aclander^*, S. MayTal-Beck, A. Altman, D. Ashery, H. Hahn, M. A. Moinester, A. Rahav, A. Feltham, G. Jones, M. Pavan, M. Sevior, D. Hutcheon, D. Ottewell, G. R. Smith, J. A. Niskanen

^*Corresponding author for this work

School of Physics and Astronomy

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6 Scopus citations

Abstract

The polarization of protons resulting from π⁺ absorption in ⁴He was measured at bombarding energies of 120 MeV and 250 MeV. Events arising from absorption in a quasi-deuteron were analysed by using kinematical constraints. The apparatus was tested by measuring the polarization of protons resulting from π⁺d→→pp. Differences observed between polarization measured for pion absorption in the deuteron and in quasi-deuterons inside ³He and ⁴He suggest that the density of the absorbing nucleon pair affects this observable. There is however a large discrepancy between the experimental results and theoretical predictions.

Original language	English
Pages (from-to)	19-23
Number of pages	5
Journal	Physics Letters B
Volume	300
Issue number	1-2
DOIs	https://doi.org/10.1016/0370-2693(93)90741-Y
State	Published - 4 Feb 1993

Funding

Funders	Funder number
Natural Sciences and Engineering Research Council of Canada
US - Israel BinationalS cienceF oundationa

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10.1016/0370-2693(93)90741-Y

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title = "Proton polarization from π+ absorption in 4He",

abstract = "The polarization of protons resulting from π+ absorption in 4He was measured at bombarding energies of 120 MeV and 250 MeV. Events arising from absorption in a quasi-deuteron were analysed by using kinematical constraints. The apparatus was tested by measuring the polarization of protons resulting from π+d→→pp. Differences observed between polarization measured for pion absorption in the deuteron and in quasi-deuterons inside 3He and 4He suggest that the density of the absorbing nucleon pair affects this observable. There is however a large discrepancy between the experimental results and theoretical predictions.",

author = "J. Aclander and S. MayTal-Beck and A. Altman and D. Ashery and H. Hahn and Moinester, {M. A.} and A. Rahav and A. Feltham and G. Jones and M. Pavan and M. Sevior and D. Hutcheon and D. Ottewell and Smith, {G. R.} and Niskanen, {J. A.}",

note = "Funding Information: This work was supportedin part by the US - Israel BinationalS cienceF oundationa nd by NSERC of Canada.",

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doi = "10.1016/0370-2693(93)90741-Y",

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T1 - Proton polarization from π+ absorption in 4He

AU - Aclander, J.

AU - MayTal-Beck, S.

AU - Altman, A.

AU - Ashery, D.

AU - Hahn, H.

AU - Moinester, M. A.

AU - Rahav, A.

AU - Feltham, A.

AU - Jones, G.

AU - Pavan, M.

AU - Sevior, M.

AU - Hutcheon, D.

AU - Ottewell, D.

AU - Smith, G. R.

AU - Niskanen, J. A.

N1 - Funding Information: This work was supportedin part by the US - Israel BinationalS cienceF oundationa nd by NSERC of Canada.

PY - 1993/2/4

Y1 - 1993/2/4

N2 - The polarization of protons resulting from π+ absorption in 4He was measured at bombarding energies of 120 MeV and 250 MeV. Events arising from absorption in a quasi-deuteron were analysed by using kinematical constraints. The apparatus was tested by measuring the polarization of protons resulting from π+d→→pp. Differences observed between polarization measured for pion absorption in the deuteron and in quasi-deuterons inside 3He and 4He suggest that the density of the absorbing nucleon pair affects this observable. There is however a large discrepancy between the experimental results and theoretical predictions.

AB - The polarization of protons resulting from π+ absorption in 4He was measured at bombarding energies of 120 MeV and 250 MeV. Events arising from absorption in a quasi-deuteron were analysed by using kinematical constraints. The apparatus was tested by measuring the polarization of protons resulting from π+d→→pp. Differences observed between polarization measured for pion absorption in the deuteron and in quasi-deuterons inside 3He and 4He suggest that the density of the absorbing nucleon pair affects this observable. There is however a large discrepancy between the experimental results and theoretical predictions.

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JO - Physics Letters B

JF - Physics Letters B

IS - 1-2

ER -

Proton polarization from π⁺ absorption in ⁴He

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