Speaker
Description
Starting from the pioneering work of Korsheninnikov ${et}$ ${al}$. [1], several experiments have been carried out to study the resonance states in $^{10}$He [1-5]. However, up to now, the energy of $^{10}$He ground state resonance is still under debate. In this talk, I will report on the three-body invariant-mass spectroscopy of $^{10}$He populated via the (${p}$,2${p}$) reaction from 2${n}$-halo nucleus $^{11}$Li at ~250 MeV/nucleon. The obtained $^{10}$He spectrum, with much higher statistics than previous two measurements [1,2], was compared to the theoretical calculation that combines the coupled-channel three-body model of $^{11}$Li [6] and the quasi-free knockout (${p}$, ${pN}$) reaction model [7,8]. Two low-lying 0$^{+}$ states of $^{10}$He were identified at ~ 1 MeV and at ~2 MeV, which have a $[s_{1/2}s_{1/2}]_{0^{+}}$ configuration and a $[p_{1/2}p_{1/2}]_{0^{+}}$ configuration, respectively. The three body corrections in Jacobi T and Jacobi Y coordinates were also extracted and compared to the model predictions. Our study shed light into the long standing puzzle about the different $^{10}$He ground state energy obtained from knockout and transfer reactions.
[1] A. A. Korsheninnikov ${et}$ ${al}$., Phys. Lett. B 326, 31 (1994).
[2] H. T. Johansson ${et}$ ${al}$., Nucl. Phys. A842, 15 (2010).
[3] Z. Kohley ${et}$ ${al}$., Phys. Rev. Lett. 109, 232501 (2012).
[4] S. I. Sidorchuk ${et}$ ${al}$., Phys. Rev. Lett. 108, 202502 (2012).
[5] P. G. Sharov ${et}$ ${al}$., Phys. Rev. C 90, 024610 (2014).
[6] Y. Kikuchi ${et}$ ${al}$., Phys. Rev. C 87, 034606 (2013).
[7] Y. Kikuchi ${et}$ ${al}$., Prog. Theo. and Expt. Phys, 2016 (2016).
[8] Y. Kubota ${et}$ ${al}$., Phys. Rev. Lett. 125, 252501 (2020).
| Topic | Experiment |
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