Differential cross section for the {sup 16}O(t, p){sup 18}O reaction and determination of the size of the two-neutron periphery in the {sup 18}O nucleus

Journal Article · Fri Sep 15 04:00:00 EDT 2017 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/S1063778817050088· OSTI ID:22759641

Zelenskaya, N. S. ^[1]

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1. Moscow State University, Skobeltsyn Institute of Nuclear Physics (Russian Federation)

Within the theoretical formalism that combines a four-body problem with themultiparticle shell model, it is shown that the cross section for the dineuteron-stripping mechanism is consistent with the experimental angular distribution of protons from the {sup 16}O(t, p){sup 18}O reaction. This makes it possible to find the wave function for the relative motion of the dineutron and {sup 16}O and to obtain thereby the probability density W(r) for the dineutron in {sup 18}O, the nn–{sup 16}O interaction potential, and the root-mean-square distance 〈L〉{sub nn} between the dineutron and {sup 16}O. The respective calculations reveal that, at r ≈ 8 fm, the dineutron probability density and a rather deep nn–{sup 16}O potential become negligible, which leads to the absence of a dineuntron periphery in {sup 18}O. It seems that one can explain this fact by a rather large value (12.19 MeV) of the dineutron binding energy in this nucleus. Thus, the {sup 18}O nucleus is quite compact an object, despite the excess of two neutrons, and has a neutron skin rather than a periphery.

• OSTI ID: 22759641
• Journal Information: Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 5 Vol. 80; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BINDING ENERGY
DIFFERENTIAL CROSS SECTIONS
DINEUTRONS
FOUR-BODY PROBLEM
MEV RANGE 10-100
NEUTRON DENSITY
OXYGEN 16
OXYGEN 18
PROTONS
SHELL MODELS
STRIPPING
WAVE FUNCTIONS