Two-neutron transfer <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mmultiscripts><mi mathvariant="normal">H</mi><mprescripts></mprescripts><none></none><mn>1</mn></mmultiscripts><mo>(</mo><mmultiscripts><mi>Li</mi><mprescripts></mprescripts><none></none><mn>11</mn></mmultiscripts><mo>,</mo><mmultiscripts><mi>Li</mi><mprescripts></mprescripts><none></none><mn>9</mn></mmultiscripts><mo>)</mo><mmultiscripts><mi mathvariant="normal">H</mi><mprescripts></mprescripts><none></none><mn>3</mn></mmultiscripts></mrow></math> at 6 MeV/nucleon

X. Wang; J. L. Ferreira; J. Lubian; J. Tanaka; R. Kanungo; A. Sanetullaev; M. Alcorta; C. Burbadge; G. Christian; B. Davids; J. Even; G. Hackman; J. Henderson; S. Ishimoto; S. Kaur; M. Keefe; R. Krücken; K. G. Leach; E. Padilla-Rodal; J. S. Randhawa; P. Ruotsalainen; O. Workman; I. Tanihata

doi:10.1103/lht6-4fyl

Two-neutron transfer ${}^{1}H ({}^{11}{Li}, {}^{9}{Li}) {}^{3}H$ at 6 MeV/nucleon

X. Wang ^1,2, J. L. Ferreira ³, J. Lubian ³, J. Tanaka ², R. Kanungo^4,5, A. Sanetullaev ^5,6, M. Alcorta ⁵, C. Burbadge^7,*, G. Christian ⁵ et al.

B. Davids ⁵, J. Even ^5,8, G. Hackman ⁵, J. Henderson ⁵, S. Ishimoto ⁹, S. Kaur⁴, M. Keefe⁴, R. Krücken ^5,10, K. G. Leach ⁵, E. Padilla-Rodal ¹¹, J. S. Randhawa^12,4, P. Ruotsalainen ⁵, O. Workman⁴, and I. Tanihata ^1,2,†

¹Department of Physics, Beihang University, Beijing 100191, China
²RCNP, The University of Osaka, Osaka 567-0047, Japan
³Instituto de Física, Universidade Federal Fluminense, Niterói, Rio de Janeiro 24210-340, Brazil
⁴Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
⁵TRIUMF, Vancouver V6T2A3, Canada
⁶New Uzbekistan University, Tashkent 100001, Uzbekistan
⁷Department of Physics, University of Guelph, Guelph N1G2W1, Canada
⁸KVI-CART, University of Groningen, 9747 AA Groningen, The Netherlands
⁹High Energy Accelerator Research Organization (KEK), Ibaraki 305-0801, Japan
¹⁰Department of Physics and Astronomy, University of British Columbia, Vancouver BC V6T 1Z1, Canada
¹¹Instituto de Ciencias Nucleares, UNAM, Mexico City 04510, Mexico
¹²Department of Physics and Astronomy, Mississippi State University, Starkville, Mississippi 39762, USA

^*Deceased.
^†Contact author: tanihata@rcnp.osaka-u.ac.jp

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Phys. Rev. C 114, 024313 – Published 6 August, 2026

DOI: https://doi.org/10.1103/lht6-4fyl

Abstract

Measurements of the ${}^{1}H ({}^{11}{Li}, {}^{9}{Li}) {}^{3}H$ reaction at 6 MeV per nucleon yield differential cross sections for transitions to the ${}^{9}{Li}$ ground and 2.69 and 4.30 MeV excited states. The transition to the 4.30 MeV $(5 / 2^{-})$ state is observed for the first time in this reaction. Coupled-reaction-channel calculations employing the São Paulo potential and shell-model spectroscopic amplitudes reasonably reproduce the measured angular distributions in magnitude. The agreement highlights the sensitivity of the two-neutron transfer process to the extended matter density distribution and correlated valence neutrons of the halo nucleus ${}^{11}{Li}$ . Direct two-neutron transfer dominates over sequential mechanisms, underscoring the correlation of the neutrons outside the ${}^{9}{Li}$ core. The results place stringent quantitative constraints on theoretical descriptions of pairing correlations and continuum coupling in weakly bound nuclei.

Physical Review C

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Two-neutron transfer ${}^{1}H ({}^{11}{Li}, {}^{9}{Li}) {}^{3}H$ at 6 MeV/nucleon

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Two-neutron transfer H1(Li11,Li9)H3 at 6 MeV/nucleon

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Two-neutron transfer ${}^{1}H ({}^{11}{Li}, {}^{9}{Li}) {}^{3}H$ at 6 MeV/nucleon