Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Di-neutron elastic transfer in the 4He(6He,6He)4He reaction   Elastic $^{6}$He+$^4$He data measured at $E_{\rm c.m.}=11.6,$ 15.9, and 60.3
MeV have been analyzed within the coupled reaction channels (CRC) formalism,
with the elastic-scattering and two-neutron ($2n$) transfer amplitudes
coherently included. Contributions from the direct (one-step) and sequential
(two-step) $2n$-transfers were treated explicitly based on a realistic
assumption for the $2n$-transfer form factor. The oscillatory pattern observed
in $^4$He($^6$He,$^6$He)$^4$He angular distribution at low energies was found
to be due to an interference between the elastic scattering and $2n$-transfer
amplitudes. Our CRC analysis shows consistently that the direct $2n$-transfer
strongly dominates over the sequential transfer and thus confirms the dominance
of 2$n-^4$He configuration over the $n-^5$He one in the $^6$He wave function.
This result suggests a strong clusterization of the two valence neutrons and
allows, therefore, a reliable estimate for the \emph{di-neutron} spectroscopic
amplitude.

26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex