Properties of the 7He ground state from 8He neutron knockout

Yu Aksyutina; H. T. Johansson; T. Aumann; K. Boretzky; M. J G Borge; A. Chatillon; L. V. Chulkov; D. Cortina-Gil; U. Datta Pramanik; H. Emling; C. Forssén; H. O U Fynbo; H. Geissel; G. Ickert; B. Jonson; R. Kulessa; C. Langer; M. Lantz; T. LeBleis; A. O. Lindahl; K. Mahata; M. Meister; G. Münzenberg; T. Nilsson; G. Nyman; R. Palit; S. Paschalis; W. Prokopowicz; R. Reifarth; A. Richter; K. Riisager; G. Schrieder; H. Simon; K. Sümmerer; O. Tengblad; H. Weick; M. V. Zhukov

doi:10.1016/j.physletb.2009.07.044

Properties of the 7He ground state from 8He neutron knockout

Yu Aksyutina, H. T. Johansson, T. Aumann, K. Boretzky, M. J G Borge, A. Chatillon, L. V. Chulkov, D. Cortina-Gil, U. Datta Pramanik, H. Emling, C. Forssén, H. O U Fynbo, H. Geissel, G. Ickert, B. Jonson^*, R. Kulessa, C. Langer, M. Lantz, T. LeBleis, A. O. LindahlK. Mahata, M. Meister, G. Münzenberg, T. Nilsson, G. Nyman, R. Palit, S. Paschalis, W. Prokopowicz, R. Reifarth, A. Richter, K. Riisager, G. Schrieder, H. Simon, K. Sümmerer, O. Tengblad, H. Weick, M. V. Zhukov

^*Corresponding author for this work

Physics

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Abstract

The unbound nucleus ⁷He, produced in neutron-knockout reactions with a 240 MeV/u ⁸He beam in a liquid-hydrogen target, has been studied in an experiment at the ALADIN-LAND setup at GSI. From an R-matrix analysis the resonance parameters for ⁷He as well as the spectroscopic factor for the ⁶He(0⁺) + n configuration in its ground-state have been obtained. The spectroscopic factor is 0.61 confirming that ⁷He is not a pure single-particle state. An analysis of ⁵He data from neutron-knockout reactions of ⁶He in a carbon target reveals the presence of an s-wave component at low energies in the α + n relative energy spectrum. A possible low-lying exited state in ⁷He observed in neutron knockout data from ⁸He in a carbon target and tentatively interpreted as a I^π = 1 / 2^- state, could not be observed in the present experiment. Possible explanations of the shape difference between the ⁷He resonance obtained in the two knockout reactions are discussed in terms of target-dependence or different reaction mechanisms at relativistic energies.

Original language	English
Pages (from-to)	191-196
Number of pages	6
Journal	Physics Letters B
Volume	679
Issue number	3
DOIs	https://doi.org/10.1016/j.physletb.2009.07.044
Publication status	Published - 24 Aug 2009

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Aksyutina, Y., Johansson, H. T., Aumann, T., Boretzky, K., Borge, M. J. G., Chatillon, A., Chulkov, L. V., Cortina-Gil, D., Pramanik, U. D., Emling, H., Forssén, C., Fynbo, H. O. U., Geissel, H., Ickert, G., Jonson, B., Kulessa, R., Langer, C., Lantz, M., LeBleis, T., ... Zhukov, M. V. (2009). Properties of the 7He ground state from 8He neutron knockout. Physics Letters B, 679(3), 191-196. https://doi.org/10.1016/j.physletb.2009.07.044

@article{452d52b6651547f18c973975526dc557,

title = "Properties of the 7He ground state from 8He neutron knockout",

abstract = "The unbound nucleus 7He, produced in neutron-knockout reactions with a 240 MeV/u 8He beam in a liquid-hydrogen target, has been studied in an experiment at the ALADIN-LAND setup at GSI. From an R-matrix analysis the resonance parameters for 7He as well as the spectroscopic factor for the 6He(0+) + n configuration in its ground-state have been obtained. The spectroscopic factor is 0.61 confirming that 7He is not a pure single-particle state. An analysis of 5He data from neutron-knockout reactions of 6He in a carbon target reveals the presence of an s-wave component at low energies in the α + n relative energy spectrum. A possible low-lying exited state in 7He observed in neutron knockout data from 8He in a carbon target and tentatively interpreted as a Iπ = 1 / 2- state, could not be observed in the present experiment. Possible explanations of the shape difference between the 7He resonance obtained in the two knockout reactions are discussed in terms of target-dependence or different reaction mechanisms at relativistic energies.",

author = "Yu Aksyutina and Johansson, {H. T.} and T. Aumann and K. Boretzky and Borge, {M. J G} and A. Chatillon and Chulkov, {L. V.} and D. Cortina-Gil and Pramanik, {U. Datta} and H. Emling and C. Forss{\'e}n and Fynbo, {H. O U} and H. Geissel and G. Ickert and B. Jonson and R. Kulessa and C. Langer and M. Lantz and T. LeBleis and Lindahl, {A. O.} and K. Mahata and M. Meister and G. M{\"u}nzenberg and T. Nilsson and G. Nyman and R. Palit and S. Paschalis and W. Prokopowicz and R. Reifarth and A. Richter and K. Riisager and G. Schrieder and H. Simon and K. S{\"u}mmerer and O. Tengblad and H. Weick and Zhukov, {M. V.}",

year = "2009",

month = aug,

day = "24",

doi = "10.1016/j.physletb.2009.07.044",

language = "English",

volume = "679",

pages = "191--196",

journal = "Physics Letters B",

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Aksyutina, Y, Johansson, HT, Aumann, T, Boretzky, K, Borge, MJG, Chatillon, A, Chulkov, LV, Cortina-Gil, D, Pramanik, UD, Emling, H, Forssén, C, Fynbo, HOU, Geissel, H, Ickert, G, Jonson, B, Kulessa, R, Langer, C, Lantz, M, LeBleis, T, Lindahl, AO, Mahata, K, Meister, M, Münzenberg, G, Nilsson, T, Nyman, G, Palit, R, Paschalis, S, Prokopowicz, W, Reifarth, R, Richter, A, Riisager, K, Schrieder, G, Simon, H, Sümmerer, K, Tengblad, O, Weick, H & Zhukov, MV 2009, 'Properties of the 7He ground state from 8He neutron knockout', Physics Letters B, vol. 679, no. 3, pp. 191-196. https://doi.org/10.1016/j.physletb.2009.07.044

TY - JOUR

T1 - Properties of the 7He ground state from 8He neutron knockout

AU - Aksyutina, Yu

AU - Johansson, H. T.

AU - Aumann, T.

AU - Boretzky, K.

AU - Borge, M. J G

AU - Chatillon, A.

AU - Chulkov, L. V.

AU - Cortina-Gil, D.

AU - Pramanik, U. Datta

AU - Emling, H.

AU - Forssén, C.

AU - Fynbo, H. O U

AU - Geissel, H.

AU - Ickert, G.

AU - Jonson, B.

AU - Kulessa, R.

AU - Langer, C.

AU - Lantz, M.

AU - LeBleis, T.

AU - Lindahl, A. O.

AU - Mahata, K.

AU - Meister, M.

AU - Münzenberg, G.

AU - Nilsson, T.

AU - Nyman, G.

AU - Palit, R.

AU - Paschalis, S.

AU - Prokopowicz, W.

AU - Reifarth, R.

AU - Richter, A.

AU - Riisager, K.

AU - Schrieder, G.

AU - Simon, H.

AU - Sümmerer, K.

AU - Tengblad, O.

AU - Weick, H.

AU - Zhukov, M. V.

PY - 2009/8/24

Y1 - 2009/8/24

N2 - The unbound nucleus 7He, produced in neutron-knockout reactions with a 240 MeV/u 8He beam in a liquid-hydrogen target, has been studied in an experiment at the ALADIN-LAND setup at GSI. From an R-matrix analysis the resonance parameters for 7He as well as the spectroscopic factor for the 6He(0+) + n configuration in its ground-state have been obtained. The spectroscopic factor is 0.61 confirming that 7He is not a pure single-particle state. An analysis of 5He data from neutron-knockout reactions of 6He in a carbon target reveals the presence of an s-wave component at low energies in the α + n relative energy spectrum. A possible low-lying exited state in 7He observed in neutron knockout data from 8He in a carbon target and tentatively interpreted as a Iπ = 1 / 2- state, could not be observed in the present experiment. Possible explanations of the shape difference between the 7He resonance obtained in the two knockout reactions are discussed in terms of target-dependence or different reaction mechanisms at relativistic energies.

AB - The unbound nucleus 7He, produced in neutron-knockout reactions with a 240 MeV/u 8He beam in a liquid-hydrogen target, has been studied in an experiment at the ALADIN-LAND setup at GSI. From an R-matrix analysis the resonance parameters for 7He as well as the spectroscopic factor for the 6He(0+) + n configuration in its ground-state have been obtained. The spectroscopic factor is 0.61 confirming that 7He is not a pure single-particle state. An analysis of 5He data from neutron-knockout reactions of 6He in a carbon target reveals the presence of an s-wave component at low energies in the α + n relative energy spectrum. A possible low-lying exited state in 7He observed in neutron knockout data from 8He in a carbon target and tentatively interpreted as a Iπ = 1 / 2- state, could not be observed in the present experiment. Possible explanations of the shape difference between the 7He resonance obtained in the two knockout reactions are discussed in terms of target-dependence or different reaction mechanisms at relativistic energies.

UR - http://www.scopus.com/inward/record.url?scp=68949127573&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2009.07.044

DO - 10.1016/j.physletb.2009.07.044

M3 - Article

AN - SCOPUS:68949127573

SN - 0370-2693

VL - 679

SP - 191

EP - 196

JO - Physics Letters B

JF - Physics Letters B

IS - 3

ER -

Properties of the 7He ground state from 8He neutron knockout

Abstract

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