Semimicroscopic algebraic description ofαclustering in22Ne

Abstract

The alpha-cluster states of 22 Ne are studied within the framework of the semimicroscopic algebraic cluster model (SACM). The band structure, energy spectrum as well as E2 and E1 transitions are calculated and are compared with the experimental data. The results are also compared with those obtained from two microscopic models: the deformed-basis antisymmetrized molecular dynamics (DAMD) approach and the generator-coordinate method (GCM). It is found that the prominent bands obtained in the latter frameworks all have equivalents in the SACM and the agreement between the calculated spectroscopic properties is rather good, especially for positive-parity states.

Thermonuclear reaction rate ofNe18(α,p)Na21Mohr1, Longland2, Iliadis3 2014Phys. Rev. C2618932View full textAdd to dashboardCite

“…This is mainly based on an interesting cancellation effect. The following discussion extends a similar idea which was already presented by Iliadis et al [35] 22 Ne reactions [21][22][23][24]; thus, the α-cluster properties of this state in 22 Ne are well-established from experiment, and also theory suggests such a state [30][31][32]. Based on mirror symmetry, a state with a similar α-cluster wave function should exist also in 22 Mg around E * ≈ 10 MeV.…”

“…Furthermore, several theoretical calculations predict a J π = 0 + state with a large α-particle reduced width, θ 2 α , near E * ≈ 10 MeV [30][31][32], consistent with the large reduced widths found both in α-capture and α-transfer.…”

Thermonuclear reaction rate of $^{18}$Ne($α$,$p$)$^{21}$Na from Monte-Carlo calculations

“…The J π = 0 + assignment for the state at 10066 keV is also preferred by ( 6Li,d) transfer data [23], although J π = 1 − cannot be ruled out. Furthermore, several theoretical calculations predict a J π = 0 + state with a large α-particle reduced width, θ 2 α , near E * ≈ 10 MeV [30][31][32], consistent with the large reduced widths found both in α-capture and α-transfer.…”

“…[28] only because shell model calculations at that time predicted B(E2)↓ ≤ 3 e 2 fm 4 (or ≤ 0.8 W.u.). However, modern calculations [30] result in larger transition strengths. Thus, it is likely that the 2 + state at E * = 10137 keV in 22 Ne has been detected by Ref.…”

A variety of clustering in $^{18}$O

“…The clustering of these nuclei shows striking characters such as an inversion doublet [1], large α-decay widths [2], and strong isoscalar monopole or dipole transitions [3,4]. It has been suggested that more rich clustering can appear in N = Z nuclei such as 9−12 Be [5-7], 13−20 C [8-24], 18−20 O [25-34], and 22−24 Ne [31,[35][36][37][38][39][40] due to the degree-of-freedom of valence neutrons. Although a number of works have provided information of the cluster structure in these nuclei, it is not still sufficient to understand the nature of clustering in neutronrich nuclei.…”