Measurement of the H-2(d,He-2)(2)n reaction at E-d=171 MeV and implications for the neutron-neutron scattering length

C. Bäumer; D. Frekers; E.W. Grewe; P. Haefner; B. Junk; A. Korff; S. Rakers; R. Schmidt; A.M. van den Berg; B.S. Davids; M.N. Harakeh; M.D. Hunyadi; M.A. de Huu; H.J. Wörtche; N. Blasi; D. de Frenne; E. Jacobs; A. Negret; L.A. Popescu; R. De Leo; P. von Neumann-Cosel; A. Richter; S. Hollstein; F. Hofmann

doi:10.1103/physrevc.71.044003

Measurement of the H-2(d,He-2)(2)n reaction at E-d=171 MeV and implications for the neutron-neutron scattering length

C. Bäumer
, D. Frekers^*
, E.W. Grewe
, P. Haefner
, B. Junk
, A. Korff
, S. Rakers
, R. Schmidt
, A.M. van den Berg
, B.S. Davids
, M.N. Harakeh
, M.D. Hunyadi
, M.A. de Huu
, H.J. Wörtche
, N. Blasi
, D. de Frenne
, E. Jacobs
, A. Negret
, L.A. Popescu
, R. De Leo

P. von Neumann-Cosel, A. Richter, S. Hollstein, F. Hofmann

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

24 Citations (Scopus)

Abstract

A measurement of the H-2(d,He-2)(2)n charge-exchange reaction at E-d=171 MeV has been performed in order to study the interaction of the di-neutron system. Spectroscopy of the neutron-neutron final-state interaction with a resolution of about 115 keV (FWHM) was achieved by measuring the momentum of He-2 at forward scattering angles. In the experiment the two protons of the unbound He-2 are momentum analyzed with a magnetic spectrometer and detected with the same detector. A simple reaction theory is employed in order to obtain information about the neutron-neutron interaction from the measured cross section data. The validity of the impulse approximation for the d ->He-2 transition at intermediate energies is discussed and compared to the Watson-Migdal theory of the proton-proton final-state interaction. Predictions of the impulse approximation for the analog transition d ->(2)n are confronted with experimental data. A procedure to extract the neutron-neutron scattering length a(nn) from this comparison is presented. The result is compatible with the recommended value of a(nn)=-18.6(+/- 0.4) fm.

Original language	English
Article number	044003
Number of pages	12
Journal	Physical Review C
Volume	71
Issue number	4
DOIs	https://doi.org/10.1103/physrevc.71.044003
Publication status	Published - 2005

Keywords

FINAL-STATE INTERACTIONS
DEUTERON BREAKUP EXPERIMENTS
PROTON-PROTON REACTION
INTERMEDIATE ENERGIES
CROSS-SECTION
POLARIZATION TRANSFER
PARAMETERS
SPECTROMETER
SPECTRA
D,HE-2

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Measurement of the H-2(d,He-2)(2)n reaction at E-d=171 MeV
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Bäumer, C., Frekers, D., Grewe, E. W., Haefner, P., Junk, B., Korff, A., Rakers, S., Schmidt, R., van den Berg, A. M., Davids, B. S., Harakeh, M. N., Hunyadi, M. D., de Huu, M. A., Wörtche, H. J., Blasi, N., de Frenne, D., Jacobs, E., Negret, A., Popescu, L. A., ... Hofmann, F. (2005). Measurement of the H-2(d,He-2)(2)n reaction at E-d=171 MeV and implications for the neutron-neutron scattering length. Physical Review C, 71(4), Article 044003. https://doi.org/10.1103/physrevc.71.044003

@article{9230ed1ae8b942068677984b69b660b1,

title = "Measurement of the H-2(d,He-2)(2)n reaction at E-d=171 MeV and implications for the neutron-neutron scattering length",

abstract = "A measurement of the H-2(d,He-2)(2)n charge-exchange reaction at E-d=171 MeV has been performed in order to study the interaction of the di-neutron system. Spectroscopy of the neutron-neutron final-state interaction with a resolution of about 115 keV (FWHM) was achieved by measuring the momentum of He-2 at forward scattering angles. In the experiment the two protons of the unbound He-2 are momentum analyzed with a magnetic spectrometer and detected with the same detector. A simple reaction theory is employed in order to obtain information about the neutron-neutron interaction from the measured cross section data. The validity of the impulse approximation for the d ->He-2 transition at intermediate energies is discussed and compared to the Watson-Migdal theory of the proton-proton final-state interaction. Predictions of the impulse approximation for the analog transition d ->(2)n are confronted with experimental data. A procedure to extract the neutron-neutron scattering length a(nn) from this comparison is presented. The result is compatible with the recommended value of a(nn)=-18.6(+/- 0.4) fm.",

keywords = "FINAL-STATE INTERACTIONS, DEUTERON BREAKUP EXPERIMENTS, PROTON-PROTON REACTION, INTERMEDIATE ENERGIES, CROSS-SECTION, POLARIZATION TRANSFER, PARAMETERS, SPECTROMETER, SPECTRA, D,HE-2",

author = "C. B{\"a}umer and D. Frekers and E.W. Grewe and P. Haefner and B. Junk and A. Korff and S. Rakers and R. Schmidt and \{van den Berg\}, A.M. and B.S. Davids and M.N. Harakeh and M.D. Hunyadi and \{de Huu\}, M.A. and H.J. W{\"o}rtche and N. Blasi and \{de Frenne\}, D. and E. Jacobs and A. Negret and L.A. Popescu and \{De Leo\}, R. and \{von Neumann-Cosel\}, P. and A. Richter and S. Hollstein and F. Hofmann",

year = "2005",

doi = "10.1103/physrevc.71.044003",

language = "English",

volume = "71",

journal = "Physical Review C",

issn = "2469-9993",

publisher = "AMER PHYSICAL SOC",

number = "4",

}

Bäumer, C, Frekers, D, Grewe, EW, Haefner, P, Junk, B, Korff, A, Rakers, S, Schmidt, R, van den Berg, AM, Davids, BS, Harakeh, MN, Hunyadi, MD, de Huu, MA, Wörtche, HJ, Blasi, N, de Frenne, D, Jacobs, E, Negret, A, Popescu, LA, De Leo, R, von Neumann-Cosel, P, Richter, A, Hollstein, S & Hofmann, F 2005, 'Measurement of the H-2(d,He-2)(2)n reaction at E-d=171 MeV and implications for the neutron-neutron scattering length', Physical Review C, vol. 71, no. 4, 044003. https://doi.org/10.1103/physrevc.71.044003

TY - JOUR

T1 - Measurement of the H-2(d,He-2)(2)n reaction at E-d=171 MeV and implications for the neutron-neutron scattering length

AU - Bäumer, C.

AU - Frekers, D.

AU - Grewe, E.W.

AU - Haefner, P.

AU - Junk, B.

AU - Korff, A.

AU - Rakers, S.

AU - Schmidt, R.

AU - van den Berg, A.M.

AU - Davids, B.S.

AU - Harakeh, M.N.

AU - Hunyadi, M.D.

AU - de Huu, M.A.

AU - Wörtche, H.J.

AU - Blasi, N.

AU - de Frenne, D.

AU - Jacobs, E.

AU - Negret, A.

AU - Popescu, L.A.

AU - De Leo, R.

AU - von Neumann-Cosel, P.

AU - Richter, A.

AU - Hollstein, S.

AU - Hofmann, F.

PY - 2005

Y1 - 2005

N2 - A measurement of the H-2(d,He-2)(2)n charge-exchange reaction at E-d=171 MeV has been performed in order to study the interaction of the di-neutron system. Spectroscopy of the neutron-neutron final-state interaction with a resolution of about 115 keV (FWHM) was achieved by measuring the momentum of He-2 at forward scattering angles. In the experiment the two protons of the unbound He-2 are momentum analyzed with a magnetic spectrometer and detected with the same detector. A simple reaction theory is employed in order to obtain information about the neutron-neutron interaction from the measured cross section data. The validity of the impulse approximation for the d ->He-2 transition at intermediate energies is discussed and compared to the Watson-Migdal theory of the proton-proton final-state interaction. Predictions of the impulse approximation for the analog transition d ->(2)n are confronted with experimental data. A procedure to extract the neutron-neutron scattering length a(nn) from this comparison is presented. The result is compatible with the recommended value of a(nn)=-18.6(+/- 0.4) fm.

AB - A measurement of the H-2(d,He-2)(2)n charge-exchange reaction at E-d=171 MeV has been performed in order to study the interaction of the di-neutron system. Spectroscopy of the neutron-neutron final-state interaction with a resolution of about 115 keV (FWHM) was achieved by measuring the momentum of He-2 at forward scattering angles. In the experiment the two protons of the unbound He-2 are momentum analyzed with a magnetic spectrometer and detected with the same detector. A simple reaction theory is employed in order to obtain information about the neutron-neutron interaction from the measured cross section data. The validity of the impulse approximation for the d ->He-2 transition at intermediate energies is discussed and compared to the Watson-Migdal theory of the proton-proton final-state interaction. Predictions of the impulse approximation for the analog transition d ->(2)n are confronted with experimental data. A procedure to extract the neutron-neutron scattering length a(nn) from this comparison is presented. The result is compatible with the recommended value of a(nn)=-18.6(+/- 0.4) fm.

KW - FINAL-STATE INTERACTIONS

KW - DEUTERON BREAKUP EXPERIMENTS

KW - PROTON-PROTON REACTION

KW - INTERMEDIATE ENERGIES

KW - CROSS-SECTION

KW - POLARIZATION TRANSFER

KW - PARAMETERS

KW - SPECTROMETER

KW - SPECTRA

KW - D,HE-2

U2 - 10.1103/physrevc.71.044003

DO - 10.1103/physrevc.71.044003

M3 - Article

SN - 2469-9993

VL - 71

JO - Physical Review C

JF - Physical Review C

IS - 4

M1 - 044003

ER -

Measurement of the H-2(d,He-2)(2)n reaction at E-d=171 MeV and implications for the neutron-neutron scattering length

Abstract

Keywords

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