Spectroscopy of He$^{7}$ using the Be$^{9}$(He$^{6}$,Be$^{8}$) 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; D. Escrig

doi:10.1103/PhysRevC.94.024619

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

F. Renzi ¹ R. Raabe ¹ G. Randisi ¹ D. Smirnov ¹ C. Angulo ² J. Cabrera ² E. Casarejos ² Th. Keutgen ² A. Ninane ² J. L. Charvet ³ A. Gillibert ³ V. Lapoux ³ L. Nalpas ³ A. Obertelli ³ F. Skaza ³ J. L. Sida ³ N.A. Orr ⁴ S. I. Sidorchuk ⁵ R. Wolski ⁵ M. J. G. Borge ⁶ D. Escrig ⁶

1 K.U.Leuven

2 UCL - Université Catholique de Louvain

3 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers

4 LPCC - Laboratoire de physique corpusculaire de Caen

5 Joint Institute for Nuclear Research - Dubna

6 CSIC - Spanish National Research Council [Madrid]

Abstract : The unbound nucleus He7 has been investigated via the reaction of a 16.8 MeV He6 radioactive ion beam on a Be9 target. The measurement of the outgoing Be8 through its well characterized two-α decay permitted the energy of the He6+n system to be reconstructed. Through comparison with a complete Monte Carlo simulation incorporating R-matrix lineshapes, the He7 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 ΓFWHM=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.

Type de document :

Article dans une revue

Physical Review C, American Physical Society, 2016, 94 (2), 〈10.1103/PhysRevC.94.024619〉

Domaine :

Physique [physics] / Physique Nucléaire Expérimentale [nucl-ex]

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

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

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