A Study on the Characteristics of Beryllium Isotopes by Using Extended Optical Model Analyses at Near-coulomb-barrier Energies

소운영 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.3

Within the framework of an extended optical model, simultaneous x2 analyses were performed for elastic scattering and fusion cross section data for the 10Be+208Pb system at near-Coulomb-barrier energies. The result showed that both direct reaction (DR) and fusion potentials extracted from x2 analyses separately satisfied the dispersion relation and that the expected threshold anomaly appeared in both the DR and the fusion parts. Using the extracted DR potential, we examined the effects of projectile breakup on the fusion cross-sections, σ expF . Finally, the present results for the 10Be + 208Pb system were compared with the analysis previously made for the 9Be + 208Pb and the 9Be + 209Bi systems.

느슨하게 묶인 핵의 문턱 비정상

소운영,천명기 한국물리학회 2008 새물리 Vol.56 No.1

광학 모델 접근법을 바탕으로, 쿨롱 장벽 에너지 근처에서의 $^{6, 7}$Li+$^{59}$Co 시스템에 대한 탄성 산란 단면적의 $\chi^{2}$ 분석을 통해 에너지 의존 퍼텐셜의 문턱 비정상을 살펴 보았다. 본 연구를 위해 우리는 에너지에 의존하지 않는 bare퍼텐셜로, 겹침퍼텐셜 (folding potential)을 사용하였다. 우리는 $^{7}$Li+$^{59}$Co 시스템에서는 문턱 비정상의 존재를 확인하였다. 하지만, 이와 대조적으로 $^{6}$Li+$^{59}$Co 시스템에서는 이러한 문턱 비정상을 볼 수 없었다. 지금까지 알려진 바에 의하면, 이것은 입사핵 (incident nuclei)의 구조적 특성 때문인 것으로 알려져 있다. 본 연구를 통해, 입사핵에 따른 이러한 문턱 비정상의 특징을 다시 한 번 확인할 수 있었다. Based on the optical model approach, we investigated the threshold anomaly in elastic scattering of the $^{6, 7}$Li + $^{59}$Co systems at near-Coulomb-barrier energies by using a $\chi^2$ analysis. A folding potential was exploited as the bare potential for the systems. We found a threshold anomaly for the $^{7}$Li + $^{59}$Co system. In contrast to the $^{7}$Li + $^{59}$Co system, the, $^{6}$Li+$^{59}$Co system showed no threshold anomaly. This difference is known to stem from the structure of the incident nuclei. From this study, we again confirmed a feature of the threshold anomaly due to the incident nuclei.

Effect of the α production process on the direct reaction for the 7Li projectile

소운영 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.7

We investigate the effect of the breakup process on the direct reaction (DR) for 7Li. In order to study this effect, we introduce the theoretical ratio factor, Rth, and the average value of the ratio factor is 0.92. The ratio factor is close to unity in the below-barrier region because many of the α particles separated from the breakup process of 7Li are not captured by the target nuclei. As a result, the α production cross sections become the main portion of the DR cross sections. However, the value of Rth in the above-barrier region are gradually suppressed because the α particles at energies above the Coulomb-barrier energy can be captured easily by the target. Using the centerof-mass energy regions of α particles, we investigate the difference of the Rth values between 6Li + 209Bi and 7Li + 209Bi systems in the above-barrier region, and we find that this difference is attributed to a reduction of the α capture cross-sections for the 7Li + 209Bi system.

Effect of Valence Neutron(s) in Neutron-rich Nuclei

소운영 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.4

In our study, we used the measured elastic cross sections for heavy ion collisions, and we extracted the total reaction cross sections and the interaction distance from the ratios of the elastic differential cross section to the Rutherford differential cross section for projectiles with and without valence neutron(s). Subsequently, we obtained the Coulomb barrier height from the extracted total reaction cross sections by using Wong' formula. Further, we investigated the relation between the obtained interaction distance and the Coulomb barrier height. As a result, we found that for valence neutron(s), the Coulomb barrier height is reduced by the presence of valence neutron(s), and the interaction distance (or the interaction radius) is increased.

저에너지 중핵반응에 대한 결합채널 및 광학모델 방법의 소개

소운영,김태형,김경식,최기석,천명기 한국물리학회 2016 새물리 Vol.66 No.12

We describe theoretical backgrounds for the coupled channel and the optical model approaches for explaining low-energy heavy-ion reactions. In order to explain the physics behind the reactions, first, we extract the total fusion cross-sections for the $^{9}$Be + $^{208}$Pb system by using the coupled channel method in which both projectile and target excitations can be included. Also, for a more intuitive understanding, we introduce the optical model method and apply it to the elastic scattering for the ${}^{11}$Be+${}^{64}$Zn system when ${}^{11}$Be nuclei are weakly-bound neutron-rich nuclei. The Coulomb dipole excitation and the long-range nuclear potentials turn out to be effective for describing the heavy-ion reactions for neutron-rich nuclei. Finally, we introduce a nuclear reaction experiment that can be performed using the RAON accelerator. 저에너지 중핵반응을 설명하기 위한 결합채널 및 광학모델 방법에 대한 이론적 배경과 관련데이터를 설명하였다. 구체적인 계산 방법을 설명하기 위해, 우선, 결합채널 방법을 이용하여 $^{9}$Be + $^{208}$Pb계의 총 핵융합 단면적 $\sigma_{TF}$을 계산하였다. 또한, 느슨하게 묶인 중성자 과잉 핵종인 ${}^{11}$Be을 이용하여 광학모델 방법으로부터 ${}^{11}$Be+${}^{64}$Zn계의 탄성산란 단면적을 잘 설명하였다. 이 결과로부터 우리는 중성자 과잉 핵종의 중핵반응을 설명하기 위해서는 쿨롱 쌍극자 들뜸 및 원거리 핵퍼텐셜을 고려해야함을 알 수 있었다.

Effect of the Non-locality Factor for Bound States in 208Pb

소운영,T. H. Kim,H. G. Cho,B. Y. Moon,천명기,김경식 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.9

We describe the bound nucleons for 208Pb with non-local nuclear potentials by solving the integralequation generated from the Schr¨odinger equation in momentum space. The binding energies, thepotential depth, the diffuseness, the radii, and the non-local parameter are obtained by fiiting theexperimental data. The wave functions of the bound nucleons due to non-locality are shown to berepulsive compared with the wave functions generated by the local potential.

중핵 반응에서 상호작용 반경

소운영,김경식 한국물리학회 2006 새물리 Vol.53 No.3

We investigate the interaction distance from the probability of elastic scattering defined as the ratio of the elastic differential cross section to the Rutherford differential cross section. The probability of elastic scattering is described as a function of the distance of closest approach $D$ (or the reduced distance $d$) related to the scattering angle, $\theta$, between the projectile and the target nuclei. This research will be useful in expanding the understanding of the nuclear reaction features of each reaction system. We also study the relation of the interaction distance between the projectile and the target nuclei. In addition, the probabilities of elastic scattering between a loosely bound projectile and a light target nucleus increases at higher incident energies. 탄성 산란 단면적과 Rutherford 산란 단면적의 비로서 정의되는 탄성 산란 확률로 부터 상호작용 반경을 조사한다. 이 탄성 산란 확률은 입사 핵과 표적 핵 사이의 산란각 $\theta$와 관련된 최근접 거리 D (또는 환산 거리 d)의 함수로 표시된다. 이때, 상호작용 반경으로 부터 각 계의 핵 반응 특징을 이해할 수 있다. 상호작용 반경은 입사 핵의 구조, 표적 핵의 질량과 밀접한 연관성을 가지고 있음을 알 수 있다. 아울러, 느슨하게 묶인 핵과 가벼운 표적 핵 사이의 상호작용 반경 아래 영역에서는 입사 핵의 입사에너지가 증가함에 따라 탄성 산란 확률도 증가한다.

비뇨기 암으로 인한 남성 외성기 림프부종의 물리치료 -사례연구-

소운영,김성중,So, Woon-Young,Kim, Sung-Joong 대한물리치료학회 2009 대한물리치료학회지 Vol.21 No.4

Purpose: Cases of male external genitalia lymphedema are relatively uncommon in the clinical physical therapy field. Of more than two thousand clinical cases treated by the author in the lymphedema treatment center, only 4~5 cases of male external genitalia lymphedema were encountered. The present case report presents the experience and treatment results of male external genitalia lymphedema from urological cancer. Method: This case was a 47-year-old man, who was treated with complex decongestive physical therapy consisting of manual lymph drainage, compression bandage (including the external genitalia), remedial exercise, skin care. Result: The results were relatively good. The clinical experience would suggest that early treatment and education can reduce the external genitalia lymphedema. However, the treatment efficacy remains limited. Therefore, early treatment is vital for more successful outcomes. Conclusion: The relief of symptoms and a decrease in male external genitalia lymphedema may be the best result from long-term conservative management.

방사선학과 학생들의 전공만족도가 진로결정몰입도에 미치는 영향

소운영,김소연,박채연,김연준,노효련 한국방사선학회 2019 한국방사선학회 논문지 Vol.13 No.3

The purpose of this study would like to investigate the effect of major satisfaction on the career decision commitment for students in department of radiological science. Using the structured questionnaire we perform the self-report survey for 218 students. As a result, the degree of major satisfaction for students is found to be mid-range, and the degree of career decision commitment for ones is lowest in the first graders and the highest in the fourth graders. A notable point is that the degree of major satisfaction seems to have a significant influence on career decision commitment. Especially, it was found that major of pride is the most influential factor in career decision commitment. From this study, finally, it seems that a method to improve the career decision commitment is needed because the degree of career decision commitment of students is assessed to be fairly lowered at a level of non-commitment. 본 연구는 방사선학과 학생들을 대상으로 전공만족도가 진로결정몰입에 미치는 영향을 알아보고자 실시하였다. 구조화된 설문지를 사용하여 218명의 방사선학과 학생들을 대상으로 자가 보고식 조사를 실시하였다. 방사선과 학생들의 전공만족도는 ‘보통’ 정도였으며 진로결정몰입도는 ‘보통’에서 ‘미몰입’ 수준으로 1학년에서 가장 낮게 나타났고 4학년에서 가장 높게 나타났다. 전공만족도는 진로결정몰입도에 영향을 주고 있었는데 특히, 하부요인인 전공 자부심이 진로결정 몰입에 가장 많은 영향을 주고 있었다. 본 연구에서 방사선학과 학생들의 진로결정몰입도는 미몰입 수준으로 낮게 나타나서 진로결정몰입도를 향상시킬 수 있는 방안이 필요한 것으로 보인다.

방사선학과 학생들의 전공만족도가 진로결정몰입도에 미치는 영향

소운영 ( Woonyoung So ),김소연 ( So Yeon Kim ),박채연 ( Chae Yeon Park ),김연준 ( Yeon Jun Kim ),노효련 ( Hyo Lyun Roh ) 한국방사선학회 2019 한국방사선학회 논문지 Vol.13 No.3

본 연구는 방사선학과 학생들을 대상으로 전공만족도가 진로결정몰입에 미치는 영향을 알아보고자 실시 하였다. 구조화된 설문지를 사용하여 218명의 방사선학과 학생들을 대상으로 자가 보고식 조사를 실시하였다. 방사선과 학생들의 전공만족도는 ‘보통’ 정도였으며 진로결정몰입도는 ‘보통’에서 ‘미몰입’ 수준으로 1 학년에서 가장 낮게 나타났고 4학년에서 가장 높게 나타났다. 전공만족도는 진로결정몰입도에 영향을 주고 있었는데 특히, 하부요인인 전공 자부심이 진로결정 몰입에 가장 많은 영향을 주고 있었다. 본 연구에서 방사선학과 학생들의 진로결정몰입도는 미몰입 수준으로 낮게 나타나서 진로결정몰입도를 향상시킬 수 있는 방안이 필요한 것으로 보인다. The purpose of this study would like to investigate the effect of major satisfaction on the career decision commitment for students in department of radiological science. Using the structured questionnaire we perform the self-report survey for 218 students. As a result, the degree of major satisfaction for students is found to be mid-range, and the degree of career decision commitment for ones is lowest in the first graders and the highest in the fourth graders. A notable point is that the degree of major satisfaction seems to have a significant influence on career decision commitment. Especially, it was found that major of pride is the most influential factor in career decision commitment. From this study, finally, it seems that a method to improve the career decision commitment is needed because the degree of career decision commitment of students is assessed to be fairly lowered at a level of non-commitment.