Search for a low-energy resonance in He-7 with the Li-7(d, He-2) reaction

N. Ryezayeva; C. Baeumer; A. M. van den Berg; L. V. Chulkov; D. Frekers; D. De Frenne; E. -W. Grewe; P. Haefner; E. Jacobs; H. Johanson; Y. Kalmykov; A. Negret; P. von Neumann-Cosel; L. Popescu; A. Richter; G. Schrieder; A. Shevchenko; H. Simon; H. J. Wortche; C. Bäumer

doi:10.1016/j.physletb.2006.06.081

Search for a low-energy resonance in He-7 with the Li-7(d, He-2) reaction

N. Ryezayeva
, C. Baeumer
, A. M. van den Berg
, L. V. Chulkov
, D. Frekers
, D. De Frenne
, E. -W. Grewe
, P. Haefner
, E. Jacobs
, H. Johanson
, Y. Kalmykov
, A. Negret
, P. von Neumann-Cosel^*
, L. Popescu
, A. Richter
, G. Schrieder
, A. Shevchenko
, H. Simon
, H. J. Wortche
, C. Bäumer

^*Corresponding author for this work

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

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Abstract

A search for the J(pi) = 1/2(-) spin-orbit partner of the J(pi) = 3/2(-) ground state in He-7 has been performed with the Li-7(d, He-2) charge-exchange reaction. The experimental results are incompatible with recent claims of such a state at very low excitation energy [M. Meister, et al., Phys. Rev. Lett. 88 (2002) 102501]. A decomposition of the spectrum is performed taking into account known resonances and quasifree charge-exchange reactions on Li-7 as well as on triton and He-4 clusters in the Li-7 ground state. A possible resonance at an excitation energy E-x approximate to 1.45 MeV with a width Gamma approximate to 2.0 MeV is suggested when the quasifree charge-exchange process on Li-7 is constrained by a measurement of the Li-6(d, He-2) reaction. Gamow-Teller strengths for transitions to the lowest states in He-7 deduced from the differential cross sections are in remarkable agreement with results from ab initio quantum Monte Carlo calculations. (c) 2006 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	623-628
Number of pages	6
Journal	Physics Letters B
Volume	639
Issue number	6
DOIs	https://doi.org/10.1016/j.physletb.2006.06.081
Publication status	Published - 24-Aug-2006

Keywords

CHARGE-EXCHANGE REACTIONS
LIGHT-NUCLEI
INTERMEDIATE ENERGIES
CROSS-SECTIONS
SHELL-MODEL
SPECTROMETER
EXCITATIONS
ISOTOPE
AGOR

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Ryezayeva, N., Baeumer, C., van den Berg, A. M., Chulkov, L. V., Frekers, D., De Frenne, D., Grewe, E. .-W., Haefner, P., Jacobs, E., Johanson, H., Kalmykov, Y., Negret, A., von Neumann-Cosel, P., Popescu, L., Richter, A., Schrieder, G., Shevchenko, A., Simon, H., Wortche, H. J., & Bäumer, C. (2006). Search for a low-energy resonance in He-7 with the Li-7(d, He-2) reaction. Physics Letters B, 639(6), 623-628. https://doi.org/10.1016/j.physletb.2006.06.081

@article{9bc864447eda4299a49f3d45b87a9c29,

title = "Search for a low-energy resonance in He-7 with the Li-7(d, He-2) reaction",

abstract = "A search for the J(pi) = 1/2(-) spin-orbit partner of the J(pi) = 3/2(-) ground state in He-7 has been performed with the Li-7(d, He-2) charge-exchange reaction. The experimental results are incompatible with recent claims of such a state at very low excitation energy [M. Meister, et al., Phys. Rev. Lett. 88 (2002) 102501]. A decomposition of the spectrum is performed taking into account known resonances and quasifree charge-exchange reactions on Li-7 as well as on triton and He-4 clusters in the Li-7 ground state. A possible resonance at an excitation energy E-x approximate to 1.45 MeV with a width Gamma approximate to 2.0 MeV is suggested when the quasifree charge-exchange process on Li-7 is constrained by a measurement of the Li-6(d, He-2) reaction. Gamow-Teller strengths for transitions to the lowest states in He-7 deduced from the differential cross sections are in remarkable agreement with results from ab initio quantum Monte Carlo calculations. (c) 2006 Elsevier B.V. All rights reserved.",

keywords = "CHARGE-EXCHANGE REACTIONS, LIGHT-NUCLEI, INTERMEDIATE ENERGIES, CROSS-SECTIONS, SHELL-MODEL, SPECTROMETER, EXCITATIONS, ISOTOPE, AGOR",

author = "N. Ryezayeva and C. Baeumer and \{van den Berg\}, \{A. M.\} and Chulkov, \{L. V.\} and D. Frekers and \{De Frenne\}, D. and Grewe, \{E. -W.\} and P. Haefner and E. Jacobs and H. Johanson and Y. Kalmykov and A. Negret and \{von Neumann-Cosel\}, P. and L. Popescu and A. Richter and G. Schrieder and A. Shevchenko and H. Simon and Wortche, \{H. J.\} and C. B{\"a}umer",

year = "2006",

month = aug,

day = "24",

doi = "10.1016/j.physletb.2006.06.081",

language = "English",

volume = "639",

pages = "623--628",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "ELSEVIER SCIENCE BV",

number = "6",

}

Ryezayeva, N, Baeumer, C, van den Berg, AM, Chulkov, LV, Frekers, D, De Frenne, D, Grewe, E-W, Haefner, P, Jacobs, E, Johanson, H, Kalmykov, Y, Negret, A, von Neumann-Cosel, P, Popescu, L, Richter, A, Schrieder, G, Shevchenko, A, Simon, H, Wortche, HJ & Bäumer, C 2006, 'Search for a low-energy resonance in He-7 with the Li-7(d, He-2) reaction', Physics Letters B, vol. 639, no. 6, pp. 623-628. https://doi.org/10.1016/j.physletb.2006.06.081

TY - JOUR

T1 - Search for a low-energy resonance in He-7 with the Li-7(d, He-2) reaction

AU - Ryezayeva, N.

AU - Baeumer, C.

AU - van den Berg, A. M.

AU - Chulkov, L. V.

AU - Frekers, D.

AU - De Frenne, D.

AU - Grewe, E. -W.

AU - Haefner, P.

AU - Jacobs, E.

AU - Johanson, H.

AU - Kalmykov, Y.

AU - Negret, A.

AU - von Neumann-Cosel, P.

AU - Popescu, L.

AU - Richter, A.

AU - Schrieder, G.

AU - Shevchenko, A.

AU - Simon, H.

AU - Wortche, H. J.

AU - Bäumer, C.

PY - 2006/8/24

Y1 - 2006/8/24

N2 - A search for the J(pi) = 1/2(-) spin-orbit partner of the J(pi) = 3/2(-) ground state in He-7 has been performed with the Li-7(d, He-2) charge-exchange reaction. The experimental results are incompatible with recent claims of such a state at very low excitation energy [M. Meister, et al., Phys. Rev. Lett. 88 (2002) 102501]. A decomposition of the spectrum is performed taking into account known resonances and quasifree charge-exchange reactions on Li-7 as well as on triton and He-4 clusters in the Li-7 ground state. A possible resonance at an excitation energy E-x approximate to 1.45 MeV with a width Gamma approximate to 2.0 MeV is suggested when the quasifree charge-exchange process on Li-7 is constrained by a measurement of the Li-6(d, He-2) reaction. Gamow-Teller strengths for transitions to the lowest states in He-7 deduced from the differential cross sections are in remarkable agreement with results from ab initio quantum Monte Carlo calculations. (c) 2006 Elsevier B.V. All rights reserved.

AB - A search for the J(pi) = 1/2(-) spin-orbit partner of the J(pi) = 3/2(-) ground state in He-7 has been performed with the Li-7(d, He-2) charge-exchange reaction. The experimental results are incompatible with recent claims of such a state at very low excitation energy [M. Meister, et al., Phys. Rev. Lett. 88 (2002) 102501]. A decomposition of the spectrum is performed taking into account known resonances and quasifree charge-exchange reactions on Li-7 as well as on triton and He-4 clusters in the Li-7 ground state. A possible resonance at an excitation energy E-x approximate to 1.45 MeV with a width Gamma approximate to 2.0 MeV is suggested when the quasifree charge-exchange process on Li-7 is constrained by a measurement of the Li-6(d, He-2) reaction. Gamow-Teller strengths for transitions to the lowest states in He-7 deduced from the differential cross sections are in remarkable agreement with results from ab initio quantum Monte Carlo calculations. (c) 2006 Elsevier B.V. All rights reserved.

KW - CHARGE-EXCHANGE REACTIONS

KW - LIGHT-NUCLEI

KW - INTERMEDIATE ENERGIES

KW - CROSS-SECTIONS

KW - SHELL-MODEL

KW - SPECTROMETER

KW - EXCITATIONS

KW - ISOTOPE

KW - AGOR

U2 - 10.1016/j.physletb.2006.06.081

DO - 10.1016/j.physletb.2006.06.081

M3 - Article

SN - 0370-2693

VL - 639

SP - 623

EP - 628

JO - Physics Letters B

JF - Physics Letters B

IS - 6

ER -

Search for a low-energy resonance in He-7 with the Li-7(d, He-2) reaction

Abstract

Keywords

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