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 KU Leuven - Catholic University of Leuven - Katholieke Universiteit 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.
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Submitted on : Thursday, September 1, 2016 - 4:23:06 PM
Last modification on : Friday, February 22, 2019 - 1:48:04 PM

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F. Renzi, R. Raabe, G. Randisi, D. Smirnov, C. Angulo, et al.. Spectroscopy of He$^{7}$ using the Be$^{9}$(He$^{6}$,Be$^{8}$) transfer reaction. Physical Review C, American Physical Society, 2016, 94 (2), ⟨10.1103/PhysRevC.94.024619⟩. ⟨in2p3-01359046⟩

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