Spectroscopy of $^{7}\mathbf{He}$ using the $^{9}\mathbf{Be}(^{6}\mathbf{He},^{8}\mathbf{Be})$ transfer reaction

Spectroscopy of ${}^{7}{He}$ using the ${}^{9}{Be} ({}^{6}{He}, {}^{8}{Be})$ transfer reaction

F. Renzi, R. Raabe, G. Randisi, D. Smirnov, C. Angulo, J. Cabrera, E. Casarejos, Th. Keutgen, A. Ninane, J. L. Charvet, A. Gillibert, V. Lapoux, L. Nalpas, A. Obertelli, F. Skaza, J. L. Sida, N. A. Orr, S. I. Sidorchuk, R. Wolski, M. J. G. Borge, and D. Escrig

Phys. Rev. C 94, 024619 – Published 29 August 2016

Abstract

The unbound nucleus ${}^{7}{He}$ has been investigated via the reaction of a 16.8 MeV ${}^{6}{He}$ radioactive ion beam on a ${}^{9}{Be}$ target. The measurement of the outgoing ${}^{8}{Be}$ through its well characterized two- $α$ decay permitted the energy of the ${}^{6}{He} + n$ system to be reconstructed. Through comparison with a complete Monte Carlo simulation incorporating $R$ -matrix lineshapes, the ${}^{7}{He}$ ground state was determined to lie 0.380(28) MeV above the neutron decay with a width of $Γ = 0.179 (21)$ MeV. A neutron spectroscopic factor $SF = 0.608 (18)$ was extracted in agreement with the most recent calculations. Significant evidence was found for a broad resonance lying at 2.6(2) MeV above threshold with a $Γ_{FWHM} = 2.3 (3)$ MeV. These parameters are fully consistent with the properties of $1 / 2^{-}$ state reported by Wuosmaa et al. [Phys. Rev. C 72, 061301(R) (2005)]. Limits were also put on the presence of narrow resonances seen in earlier experiments.

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Received 8 June 2016

DOI:https://doi.org/10.1103/PhysRevC.94.024619

Physics Subject Headings (PhySH)

Transfer reactions Unstable nuclei induced nuclear reactions

6 ≤ A ≤ 19

Monte Carlo methods Radioactive beams

Nuclear Physics

Authors & Affiliations

F. Renzi^1,*, R. Raabe¹, G. Randisi¹, D. Smirnov^1,†, C. Angulo^2,‡, J. Cabrera², E. Casarejos^2,§, Th. Keutgen², A. Ninane², J. L. Charvet³, A. Gillibert³, V. Lapoux³, L. Nalpas³, A. Obertelli³, F. Skaza³, J. L. Sida³, N. A. Orr⁴, S. I. Sidorchuk⁵, R. Wolski^5,6, M. J. G. Borge⁷, and D. Escrig^7,∥

¹KU Leuven, Department of Physics and Astronomy, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, 3001 Leuven, Belgium
²Centre de Recherches du Cyclotron, Université Catholique de Louvain, B-1348, Louvain-la-Neuve, Belgium
³CEA-Saclay, DRF/IRFU/SPhN, F-91191, Gif-sur-Yvette Cedex, France
⁴LPC-Caen, ENSICAEN, IN2P3/CNRS, Normandie Université, 14050, Caen Cedex, France
⁵Flerov Laboratory of Nuclear Reactions, JINR, RU-141980, Dubna, Russia
⁶Institute of Nuclear Physics, PAN, PL-31342, Crakow, Poland
⁷Instituto de Estructura de la Materia, CSIC, E-28040, Madrid, Spain

^*francesca.renzi@fys.kuleuven.be
^†Present address: Atys Concept, F-33210 Arcachon, France.
^‡Present address: Tractebel Engineering S.A., Avenue Ariane 7, B-1200 Brussels, Belgium.
^§Present address: Universidade de Vigo, E-36310 Vigo, Spain.
^∥Present address: Consejo de Seguridad Nuclear, c/Justo Dorado, 11 E-28040 Madrid, Spain.

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Vol. 94, Iss. 2 — August 2016

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Physical Review C

covering nuclear physics

Spectroscopy of ${}^{7}{He}$ using the ${}^{9}{Be} ({}^{6}{He}, {}^{8}{Be})$ transfer reaction

F. Renzi, R. Raabe, G. Randisi, D. Smirnov, C. Angulo, J. Cabrera, E. Casarejos, Th. Keutgen, A. Ninane, J. L. Charvet, A. Gillibert, V. Lapoux, L. Nalpas, A. Obertelli, F. Skaza, J. L. Sida, N. A. Orr, S. I. Sidorchuk, R. Wolski, M. J. G. Borge, and D. Escrig

Phys. Rev. C 94, 024619 – Published 29 August 2016

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Physical Review C

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Spectroscopy of He7 using the Be9(He6,Be8) transfer reaction

F. Renzi, R. Raabe, G. Randisi, D. Smirnov, C. Angulo, J. Cabrera, E. Casarejos, Th. Keutgen, A. Ninane, J. L. Charvet, A. Gillibert, V. Lapoux, L. Nalpas, A. Obertelli, F. Skaza, J. L. Sida, N. A. Orr, S. I. Sidorchuk, R. Wolski, M. J. G. Borge, and D. Escrig

Phys. Rev. C 94, 024619 – Published 29 August 2016

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Spectroscopy of ${}^{7}{He}$ using the ${}^{9}{Be} ({}^{6}{He}, {}^{8}{Be})$ transfer reaction