Publication: Halo-like structure in He-7 nucleus
Дата
2020
Авторы
Demyanova, A. S.
Ogloblin, A. A.
Chernishev, B. A.
Goncharov, S. A.
Gurov, Y. B.
Lapushkin, S. V.
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Аннотация
A study of the neutron structure of the ground state of He-7 has been performed by means of registration and analysis of the decay channels of the residual nuclei following absorption of stopped pions. In particular, the reaction Be-9 (pi(-),d)X have been investigated where X denotes any system with five neutrons and two protons - the constituencies of a H-7 nucleus. It was shown that the structure of H-7 is determined by correlations of two neutrons in the states He-6 (0(+)), He-6 (2(+)) and one neutron in the shell p(3/2). The He-4+3n structure is not manifested in the ground state of H-7. The obtained results are consistent with the known data on considerable mixture of configurations "He-6 in its ground and first excited states plus a neutron" in the ground state of H-7. Comparison of the diffraction components of the differential cross-sections of the charge-exchange reactions (t, He-3) measured on Li-6 and Li-7 allowed extracting the radius of particle-unstable nucleus H-7. The latter occurred to be approximately equal to those of He-6 and H-7. The obtained result indicates to existence of the halo-like structure in H-7.
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Halo-like structure in He-7 nucleus / Demyanova, AS [et al.] // 27TH INTERNATIONAL NUCLEAR PHYSICS CONFERENCE (INPC2019). - 2020. - 1643. - 10.1088/1742-6596/1643/1/012128