4He(π,π'p)3H reaction: Quasifree and resonance scattering

M. K. Jones; D. Dehnhard; S. K. Nanda; S. M. Sterbenz; C. L. Morris; M. Plum; J. D. Zumbro; Ahmed Hussein; D. S. Oakley; M. J. Smithson; A. L. Williams; J. McDonald; M. A. Bryan; A. H. Fuentes; M. Lynker; D. Crockett; M. A. Machuca; S. Mordechai; C. Fred Moore

doi:10.1103/PhysRevC.42.R807

⁴He(π,π'p)³H reaction: Quasifree and resonance scattering

M. K. Jones, D. Dehnhard, S. K. Nanda, S. M. Sterbenz, C. L. Morris, M. Plum, J. D. Zumbro, Ahmed Hussein, D. S. Oakley, M. J. Smithson, A. L. Williams, J. McDonald, M. A. Bryan, A. H. Fuentes, M. Lynker, D. Crockett, M. A. Machuca, S. Mordechai, C. Fred Moore

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Abstract

Exclusive ⁴He(π^±,π^±'p)³H spectra in the excitation energy range between 21.5 and 44 MeV in ⁴He were measured at T_π=180 MeV at several pion and proton angles. The cross section ratio R_πp=σ(π⁺, π^+,p)/(π^-,π^-,p) was found to be between 1 and 2 near 22 MeV which is in the region of the J^π=2^-, T=0 state. Between 25 and 40 MeV in the continuum, which comprises the giant dipole resonance and broad 2^- and 2⁺ states, R_πp ranges from 0.22 to 45 in sharp contrast to the predicted values of 1 from a model assuming the entire yield is due to the sequential decay of a state of good isospin, and 6 to 9 from a distorted-wave impulse approximation calculation assuming quasifree proton knockout.

Original language	English
Pages (from-to)	R807-R810
Journal	Physical Review C - Nuclear Physics
Volume	42
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.42.R807
State	Published - 1 Jan 1990
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.42.R807

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Jones, M. K., Dehnhard, D., Nanda, S. K., Sterbenz, S. M., Morris, C. L., Plum, M., Zumbro, J. D., Hussein, A., Oakley, D. S., Smithson, M. J., Williams, A. L., McDonald, J., Bryan, M. A., Fuentes, A. H., Lynker, M., Crockett, D., Machuca, M. A., Mordechai, S., & Moore, C. F. (1990). ⁴He(π,π'p)³H reaction: Quasifree and resonance scattering. Physical Review C - Nuclear Physics, 42(3), R807-R810. https://doi.org/10.1103/PhysRevC.42.R807

@article{0794a7eb17a147ffa128b37f0cf4254b,

title = "4He(π,π'p)3H reaction: Quasifree and resonance scattering",

abstract = "Exclusive 4He(π±,π±'p)3H spectra in the excitation energy range between 21.5 and 44 MeV in 4He were measured at Tπ=180 MeV at several pion and proton angles. The cross section ratio Rπp=σ(π+, π+,p)/(π-,π-,p) was found to be between 1 and 2 near 22 MeV which is in the region of the Jπ=2-, T=0 state. Between 25 and 40 MeV in the continuum, which comprises the giant dipole resonance and broad 2- and 2+ states, Rπp ranges from 0.22 to 45 in sharp contrast to the predicted values of 1 from a model assuming the entire yield is due to the sequential decay of a state of good isospin, and 6 to 9 from a distorted-wave impulse approximation calculation assuming quasifree proton knockout.",

author = "Jones, \{M. K.\} and D. Dehnhard and Nanda, \{S. K.\} and Sterbenz, \{S. M.\} and Morris, \{C. L.\} and M. Plum and Zumbro, \{J. D.\} and Ahmed Hussein and Oakley, \{D. S.\} and Smithson, \{M. J.\} and Williams, \{A. L.\} and J. McDonald and Bryan, \{M. A.\} and Fuentes, \{A. H.\} and M. Lynker and D. Crockett and Machuca, \{M. A.\} and S. Mordechai and Moore, \{C. Fred\}",

note = "Funding Information: TK, BBX and the research leading to these results have received support from the Innovative Medicines Initiative Joint Undertaking ( https://www.imi.europa.eu/ ) under grant agreement no [115523] COMBACTE-NET (Combatting Bacterial Resistance in Europe) and no [ 115620] COMBACTE-CARE , resources of which are composed of financial contribution from the European Union{\textquoteright}s Seventh Framework Programme ( FP7/2007-2013 ) and EFPIA companies{\textquoteright} kind contribution . MNN is supported by COMPARE (Collaborative Management Platform for detection and Analyses of (Re-)emerging and Foodborne Outbreaks in Europe) [H2020 Grant number: 643476 ]. ",

year = "1990",

month = jan,

day = "1",

doi = "10.1103/PhysRevC.42.R807",

language = "English",

volume = "42",

pages = "R807--R810",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

number = "3",

}

Jones, MK, Dehnhard, D, Nanda, SK, Sterbenz, SM, Morris, CL, Plum, M, Zumbro, JD, Hussein, A, Oakley, DS, Smithson, MJ, Williams, AL, McDonald, J, Bryan, MA, Fuentes, AH, Lynker, M, Crockett, D, Machuca, MA, Mordechai, S & Moore, CF 1990, '⁴He(π,π'p)³H reaction: Quasifree and resonance scattering', Physical Review C - Nuclear Physics, vol. 42, no. 3, pp. R807-R810. https://doi.org/10.1103/PhysRevC.42.R807

TY - JOUR

T1 - 4He(π,π'p)3H reaction

T2 - Quasifree and resonance scattering

AU - Jones, M. K.

AU - Dehnhard, D.

AU - Nanda, S. K.

AU - Sterbenz, S. M.

AU - Morris, C. L.

AU - Plum, M.

AU - Zumbro, J. D.

AU - Hussein, Ahmed

AU - Oakley, D. S.

AU - Smithson, M. J.

AU - Williams, A. L.

AU - McDonald, J.

AU - Bryan, M. A.

AU - Fuentes, A. H.

AU - Lynker, M.

AU - Crockett, D.

AU - Machuca, M. A.

AU - Mordechai, S.

AU - Moore, C. Fred

N1 - Funding Information: TK, BBX and the research leading to these results have received support from the Innovative Medicines Initiative Joint Undertaking ( https://www.imi.europa.eu/ ) under grant agreement no [115523] COMBACTE-NET (Combatting Bacterial Resistance in Europe) and no [ 115620] COMBACTE-CARE , resources of which are composed of financial contribution from the European Union’s Seventh Framework Programme ( FP7/2007-2013 ) and EFPIA companies’ kind contribution . MNN is supported by COMPARE (Collaborative Management Platform for detection and Analyses of (Re-)emerging and Foodborne Outbreaks in Europe) [H2020 Grant number: 643476 ].

PY - 1990/1/1

Y1 - 1990/1/1

N2 - Exclusive 4He(π±,π±'p)3H spectra in the excitation energy range between 21.5 and 44 MeV in 4He were measured at Tπ=180 MeV at several pion and proton angles. The cross section ratio Rπp=σ(π+, π+,p)/(π-,π-,p) was found to be between 1 and 2 near 22 MeV which is in the region of the Jπ=2-, T=0 state. Between 25 and 40 MeV in the continuum, which comprises the giant dipole resonance and broad 2- and 2+ states, Rπp ranges from 0.22 to 45 in sharp contrast to the predicted values of 1 from a model assuming the entire yield is due to the sequential decay of a state of good isospin, and 6 to 9 from a distorted-wave impulse approximation calculation assuming quasifree proton knockout.

AB - Exclusive 4He(π±,π±'p)3H spectra in the excitation energy range between 21.5 and 44 MeV in 4He were measured at Tπ=180 MeV at several pion and proton angles. The cross section ratio Rπp=σ(π+, π+,p)/(π-,π-,p) was found to be between 1 and 2 near 22 MeV which is in the region of the Jπ=2-, T=0 state. Between 25 and 40 MeV in the continuum, which comprises the giant dipole resonance and broad 2- and 2+ states, Rπp ranges from 0.22 to 45 in sharp contrast to the predicted values of 1 from a model assuming the entire yield is due to the sequential decay of a state of good isospin, and 6 to 9 from a distorted-wave impulse approximation calculation assuming quasifree proton knockout.

UR - https://www.scopus.com/pages/publications/25044473675

U2 - 10.1103/PhysRevC.42.R807

DO - 10.1103/PhysRevC.42.R807

M3 - Article

AN - SCOPUS:25044473675

SN - 0556-2813

VL - 42

SP - R807-R810

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 3

ER -

⁴He(π,π'p)³H reaction: Quasifree and resonance scattering

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