Study of spin-isospin responses of radioactive nuclei with the background-reduced neutron spectrometer, PANDORA

L. Stuhl , M. Sasano , J. Gao , Y. Hirai , K. Yako , T. Wakasa , D.S. Ahn , H. Baba , A.I. Chilug , S. Franchoo (1) , Y. Fujino , N. Fukuda , J. Gibelin (2) , I.S. Hahn , Z. Halász , T. Harada , M.N. Harakeh , D. Inomoto , T. Isobe , H. Kasahara , D. Kim , G.G. Kiss , T. Kobayashi , Y. Kondo , Z. Korkulu , S. Koyama , Y. Kubota , A. Kurihara , H.N. Liu (3) , M. Matsumoto , S. Michimasa , H. Miki , M. Miwa , T. Motobayashi , T. Nakamura , M. Nishimura , H. Otsu , V. Panin , S. Park , A.T. Saito , H. Sakai , H. Sato , T. Shimada , Y. Shimizu , S. Shimoura , A. Spiridon , I.C. Stefanescu , X. Sun , Y.L. Sun (3) , H. Suzuki , E. Takada , Y. Togano , T. Tomai , L. Trache , D. Tudor , T. Uesaka , H. Yamada , Z. Yang , M. Yasuda , K. Yoneda , K. Yoshida , J. Zenihiro , N. Zhang

1 IPNO - Institut de Physique Nucléaire d'Orsay
2 LPCC - Laboratoire de physique corpusculaire de Caen
3 DPHN - Département de Physique Nucléaire (ex SPhN)

The status of a project to measure spin-isospin responses of neutron drip-line nuclei using a new low-energy neutron detector, PANDORA (Particle Analyzer Neutron Detector Of Real-time Acquisition), is reported. The performance of PANDORA was characterized by the 6 He (p,n) 6 Li reaction in inverse kinematics at the HIMAC facility in Chiba. Observation of the strong transition to the ground state in 6 Li is discussed. Preliminary results of 11 Li (p,n) 11 Be and 14 Be (p,n) 14 B experiments in inverse kinematics at RI Beam Factory (RIBF) of RIKEN Nishina Center are also presented including the exotic decay channel of 11 Be → 9 Li + d. Details of the experimental setup based on PANDORA and the SAMURAI large-acceptance magnetic spectrometer, as well as the combined data-acquisition system are described. The neutron-gamma discrimination capability of PANDORA was evaluated, Figure-of-Merit (FoM) values higher than those found in the literature for similar materials were derived from experimental data.

Mots clés: Spin-isospin response; Gamow-Teller transition; Inverse-kinematics (p; n) reactions; Low-energy neutron detector; Real-time pulse-shape discrimination; Figure-of-Merit (FoM); Inverse-kinematics [formula omitted] reactions

Domaines: Physique [physics]

L. Stuhl, M. Sasano, J. Gao, Y. Hirai, K. Yako, et al.. Study of spin-isospin responses of radioactive nuclei with the background-reduced neutron spectrometer, PANDORA. 18th International Conference on Electromagnetic Isotope Separators and Related Topics, Sep 2018, Geneva, Switzerland. pp.189-194, ⟨10.1016/j.nimb.2019.05.057⟩. ⟨hal-02447926⟩