Effective description of \({ {}}^{5-10}\text{He}\) and the search for a narrow \({{}^4\text{n}}\) resonance. (English) Zbl 1437.81153
Orr, N. A. (ed.) et al., Recent progress in few-body physics. Proceedings of the 22nd international conference on few-body problems in physics, FB22, Caen, France, July 9–13, 2018. Cham: Springer. Springer Proc. Phys. 238, 361-372 (2020).
Summary: Open quantum systems that are at or beyond the limit of particle-emission stability exhibit generic features stemming from their coupling to an environment of positive energy states and decay channels. In nuclear physics, the exotic helium isotopes \(^{5-10}\text{He}\) and the four-neutron system \(^4\text{n}\) represent two prototypical cases of open quantum systems whose structures are highly impacted by the environment. In the first part, a practical approach inspired by halo effective field theory for the description of \(^{5-10}\text{He}\) within tens of keV uncertainties is presented and the parity inversion in \(^9\text{He}\), as well as the possible two-neutron decay of \(^{10}\text{He}\) are discussed. The second part discusses the last ab initio results on the four-neutron system obtained using chiral forces and including continuum couplings.
For the entire collection see [Zbl 1432.81005].
For the entire collection see [Zbl 1432.81005].
MSC:
| 81V35 | Nuclear physics |
| 81S22 | Open systems, reduced dynamics, master equations, decoherence |
| 81T12 | Effective quantum field theories |
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