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論文

Probing surface distributions of $$alpha$$ clusters in $$^{20}$$Ne via $$alpha$$-transfer reaction

福井 徳朗; 谷口 億宇*; 須原 唯広*; 延与 佳子*; 緒方 一介*

Journal of Physics; Conference Series, 863(1), p.012036_1 - 012036_3, 2017/07

Direct evidence of the $$alpha$$-cluster development has not been obtained yet although it was carried out a number of experimental studies attempting to extract the information of the clustering. We aim to verify the development of the $$alpha$$-cluster structure from observables. As a first application, it is argued how to extract the spatial information of the cluster structure of $$^{20}$$Ne through the cross section of $$^{16}$$O($$^6$$Li,$$d$$)$$^{20}$$Ne. For the analysis of the transfer reaction, we work with the coupled-channels Born approximation (CCBA) approach, in which the breakup effects of $$^6$$Li are taken into account by means of the continuum-discretized coupled-channels method (CDCC). The microscopic cluster model (MCM) with the generator coordinate method (GCM) is adopted to calculate the $$alpha$$-$$^{16}$$O wave function. We show that our calculation gives a significant improvement of the prediction on the transfer cross section to be consistent with experimental data. It is found that the surface region of the cluster wave function is sensitive to the cross section.

論文

Probing surface distributions of $$alpha$$ clusters in $$^{20}$$Ne via $$alpha$$-transfer reaction

福井 徳朗; 谷口 億宇*; 須原 唯広*; 延与 佳子*; 緒方 一介*

Physical Review C, 93(3), p.034606_1 - 034606_9, 2016/03

AA2015-0612.pdf:0.54MB

 被引用回数:9 パーセンタイル:19.12(Physics, Nuclear)

Direct evidence of the $$alpha$$-cluster development has not been obtained yet although it was carried out a number of experimental studies attempting to extract the information of the clustering. We aim to verify the development of the $$alpha$$-cluster structure from observables. As a first application, it is argued how to extract the spatial information of the cluster structure of $$^{20}$$Ne through the cross section of $$^{16}$$O($$^6$$Li,$$d$$)$$^{20}$$Ne. For the analysis of the transfer reaction, we work with the coupled-channels Born approximation (CCBA) approach, in which the breakup effects of $$^6$$Li are taken into account by means of the continuum-discretized coupled-channels method (CDCC). The microscopic cluster model (MCM) with the generator coordinate method (GCM) is adopted to calculate the $$alpha$$-$$^{16}$$O wave function. We show that our calculation gives a significant improvement of the prediction on the transfer cross section to be consistent with experimental data. It is found that the surface region of the cluster wave function is sensitive to the cross section.

口頭

$$alpha$$移行反応を用いた$$alpha$$クラスター分布の探査

福井 徳朗; 谷口 億宇*; 須原 唯広*; 延与 佳子*; 緒方 一介*

no journal, , 

クラスター現象は核図表の広い領域に渡って発現すると期待されており、不安定核やsd殻領域の核もクラスター構造を持つことが予言されている。しかしながら、構成粒子へ崩壊する共鳴状態を除いては、クラスター構造を証明する実験はこれまで存在してない。したがって、観測量を用いてクラスター構造を実証する手法の確立が強く求められている。本研究では、安定核における典型的な$$alpha$$クラスター核とされる$$^{20}$$Neに注目する。そして、$$^{20}$$Neの核表面における$$alpha$$粒子の存在確率を、$$alpha$$移行反応$$^{16}$$O($$^{6}$$Li,$$d$$)$$^{20}$$Neの解析から決定することを目標とする。上記移行反応は、連続状態離散化チャネル結合法(CDCC)によって$$^{6}$$Liの分解状態を考慮した、チャネル結合Born近似(CCBA)により記述する。$$^{20}$$Neと$$alpha$$-$$^{16}$$O配位の重なり関数の計算には微視的クラスター模型を採用する。移行断面積の角度分布から、上述の、核表面における$$alpha$$粒子の存在確率を決定可能であることを報告する。この存在確率は、これまでクラスター構造の指標とされてきた分光学的因子とも漸近規格化定数(ANC)とも異なる物理量である。前者は重なり関数の全領域に渡る積分量として、後者は重なり関数の漸近領域の振幅として、それぞれ定義される。本研究で提案する手法は汎用的であり、不安定核やsd核のクラスター構造を実証するためにも非常に有用であると期待される。

口頭

Description of transfer reactions with coupled-channels Born approximation

福井 徳朗; 延与 佳子*; 菊地 右馬*; 松本 琢磨*; 緒方 一介*; 須原 唯広*; 谷口 億宇*; 八尋 正信*

no journal, , 

First, we show that, for the coupled-channels Born approximation (CCBA) analysis of the $$^{8}{rm B}(d,n)^{9}{rm C}$$ reaction, it is essentially important to consider the transfer process from (to) the breakup state of $$d$$ ($$^{9}{rm C}$$). These transfer process called the breakup transfer is never taken into account in the distorted-wave Born approximation (DWBA). Next, the importance of the CCBA model is given for the description of the $$alpha$$-transfer reaction$$^{16}{rm O}(^{6}{rm Li},d)^{20}{rm Ne}$$, of which, so far the DWBA has been failed to produce the cross section to be consistent with measured one. Our calculation greatly improves coincidence of the calculation with the data and enables us to discuss the surface distribution of the $$alpha$$-cluster structure of $$^{20}{rm Ne}$$. Finally, how to describe transfer reaction to continuum state, such as $$alpha(d,p)^{5}{rm He}$$, is presented. It is known that the integration in the transition matrix ($$T$$ matrix) of such reaction does not converge. To avoid this problem, the prior form of the $$T$$ matrix, for which the CCBA model is required to calculate the approximately exact wave function of the final channel, is employed.

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