Theoretical Nuclear and Hadron Physics
Department of Physics
Kyungpook National University


About Me


Yongseok Oh

Department of Physics 
Kyungpook National University
Daegu 702-701, Korea

Tel: +82-53-950-7373
Fax: +82-53-952-1739
Email: yohphy at knu.ac.kr

오용석
대구광역시 북구 산격동 1370
경북대학교 자연과학대학 물리학과
(우) 702-701

전화: 053-950-7373
팩스: 053-952-1739
이메일: yohphy@knu.ac.kr

Recent Papers

 

PHYSICAL REVIEW C 94, 024320 (2016) 

Nuclear isospin asymmetry in α decay of heavy nuclei 

Eunkyoung Shin,1,* Yeunhwan Lim,2,Chang Ho Hyun,3,and Yongseok Oh1,4,§ 

1Department of Physics, Kyungpook National University, Daegu 41566, Korea
2Rare Isotope Science Project, Institute for Basic Science, Daejeon 34047, Korea 3Department of Physics Education, Daegu University, Gyeongsan, Gyeongbuk 38453, Korea 4Asia Pacific Center for Theoretical Physics, Pohang, Gyeongbuk 37673, Korea
(Received 11 November 2015; revised manuscript received 20 June 2016; published 12 August 2016)

The effects of nuclear isospin asymmetry on α-decay lifetimes of heavy nuclei are investigated within various phenomenological models of the nuclear potential for the α particle. We consider the widely used simple square-well potential and Woods-Saxon potential and modify them by including an isospin asymmetry term. We then suggest a model for the potential of the α particle motivated ... read more 


PHYSICAL REVIEW C 93, 021901(R) (2016) 

Nonperturbative collisional energy loss of heavy quarks in quark-gluon plasma

Nikolai Kochelev,1,2,* Hee-Jung Lee,3,Yongseok Oh,4,5,6,Baiyang Zhang,1,§ and Pengming Zhang1,1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow Region 141980, Russia 3Department of Physics Education, Chungbuk National University, Cheongju, Chungbuk 28644, Korea 4Department of Physics, Kyungpook National University, Daegu 41566, Korea
5Asia Pacific Center for Theoretical Physics, Pohang, Gyeongbuk 37673, Korea
6Institute for Nuclear Studies and Department of Physics, The George Washington University, Washington, DC 20052, USA (Received 6 October 2015; published 11 February 2016)

We suggest a new mechanism for the energy loss of fast heavy quarks in quark-gluon plasma. This mechanism is based on pion production caused by the anomalous chromomagnetic quark-gluon-pion interaction induced by strong topological fluctuations of the gluon fields represented by instantons.  ...  read more



NUCLEAR PHYSICS A 946, 89 (2016) 

Peculiarities of quasifission reactions in heavy ion collisions

Avazbek Nasirov a,b,c,, Bakhodir Kayumov b,d, Yongseok Oh c,e,f

a Bogoliubov Laboratory of Theoretical Physics, JINR, Dubna, Russia
b Heavy Ion Physics Laboratory, Institute of Nuclear Physics, Tashkent, Uzbekistan
c Department of Physics, Kyungpook National University, Daegu 41566, Republic of Korea
d Inha University in Tashkent, Uzbekistan
e Asia Pacific Center for Theoretical Physics, Pohang, Gyeongbuk 37673, Republic of Korea
f Institute for Nuclear Studies and Department of Physics, The George Washington University, Washington, DC 20052, USA

Received 29 September 2015; received in revised form 23 November 2015; accepted 24 November 2015 Available online 27 November 2015

Abstract

The probability of the formation and decay of a dinuclear system is investigated for a wide range of relative orbital angular momentum values. The mass and angular distributions of the quasifission fragments are studied to understand the reaction mechanisms of the heavy ion collision of 78Kr (10A MeV) + 40Ca within dinuclear system model. The quasifission products are found to contribute to the mass-symmetric region of the mass distribution in collisions with a large orbital angular momentum.  ...  read more 


PHYSICAL REVIEW C 92, 024325 (2015) 

Investigation of the nnΛ bound state in points effective theory

Shung-Ichi Ando,1,* Udit Raha,2,and Yongseok Oh3,4,
1Department of Information Communication and Display Engineering, Sunmoon University, Asan, Chungnam 31460, Korea 2Department of Physics, Indian Institute of Technology Guwahati, 781 039 Assam, India
3Department of Physics, Kyungpook National University, Daegu 41566, Korea
4Asia Pacific Center for Theoretical Physics, Pohang, Gyeongbuk 37673, Korea
(Received 9 July 2015; revised manuscript received 8 August 2015; published 31 August 2015) 

The possibility of an nn􏰀 bound state is investigated in the framework of pionless effective field theory at leading order. A system of coupled integral equations are constructed in the spin-isospin basis, of which numerical solutions are investigated. In particular, we make use of the limit cycle behavior, i.e., cyclic singularities of coupled integral equations of the system, which would be associated with the formation of a three-body bound state, the so-called Efimov state, ...   read more  

PHYSICAL REVIEW C 91, 065208 (2015)

Kbar + N K + Xi􏰋 reaction and S = 1 hyperon resonances

Benjamin C. Jackson,1 Yongseok Oh,2,3,* H. Haberzettl,4,and K. Nakayama1,5,


1Department of Physics and Astronomy, The University of Georgia, Athens, GA 30602, USA

2Department of Physics, Kyungpook National University, Daegu 702-701, Korea

3Asia Pacific Center for Theoretical Physics, Pohang, Gyeongbuk 790-784, Korea

4Institute for Nuclear Studies and Department of Physics, The George Washington University, Washington, DC 20052, USA 

5Institut fu ̈r Kernphysik and Center for Hadron Physics, Forschungszentrum Ju ̈lich, 52425 Ju ̈lich, Germany 

(Received 4 March 2015; revised manuscript received 17 May 2015; published 25 June 2015) 

The Kbar + N K + Xi􏰋 reaction is studied for center-of-momentum energies ranging from threshold to 3 GeV in an effective Lagrangian approach that includes the hyperon s- and u-channel contributions as well as a phenomenological contact amplitude. The latter accounts for the rescattering term in the scattering equation and possible short-range dynamics not included explicitly in the model. Existing data are well reproduced and three above-the-threshold resonances were found to be required to describe the data, namely, the 􏰀Lambda(1890), 􏰁Sigma(2030), and Sigma􏰁(2250). For the latter resonance we have assumed .... read more 

PHYSICAL REVIEW C 91, 054612 (2015)


Theoretical study of the almost sequential mechanism of true ternary fission

R. B. Tashkhodjaev,1,2,* A. I. Muminov,1 A. K. Nasirov,1,3,4,W. von Oertzen,5,6 and Yongseok Oh4,7,‡ 

1Institute of Nuclear Physics, Uzbek Academy of Science, 100214 Tashkent, Uzbekistan

2Inha University in Tashkent, 100170, Tashkent, Uzbekistan

3Joint Institute for Nuclear Research, Joliot-Curie 6, 141980 Dubna, Russia

4Department of Physics, Kyungpook National University, Daegu 702-701, Korea 

5Helmholtz-Zentrum Berlin, Glienickerstr. 100, 14109 Berlin, Germany

6Fachbereich Physik, Freie Universita ̈t, 14195 Berlin, Germany

7Asia Pacific Center for Theoretical Physics, Pohang, Gyeongbuk 790-784, Korea

(Received 10 March 2015; published 11 May 2015)

We consider the collinear ternary fission which is a sequential ternary decay with a very short time between the ruptures of two necks connecting the middle cluster of the ternary nuclear system and outer fragments. In particular, we consider the case where the Coulomb field of the first massive fragment separated during the first step of the fission produces a lower pre-scission barrier in the second step of the residual part of the ternary system. In this case, we obtain a probability of about 103 per binary fission for the yield .... read more 


PHYSICAL REVIEW C 91, 054610 (2015)


Toward neutron-rich nuclei via transfer reactions with stable and radioactive beams

Myeong-Hwan Mun,1,2,* G. G. Adamian,3 N. V. Antonenko,3 Yongseok Oh,1,4,and Youngman Kim

1Department of Physics, Kyungpook National University, Daegu, 702-701, Korea
2Nuclear Data Center, Korea Atomic Energy Research Institute, Daejeon, 305-353, Korea
3Joint Institute for Nuclear Research, 141980 Dubna, Russia
4Asia Pacific Center for Theoretical Physics, Pohang, Gyeongbuk 790-784, Korea
5Rare Isotope Science Project, Institute for Basic Science, Daejeon, 305-811, Korea


(Received 17 February 2015; revised manuscript received 25 April 2015; published 11 May 2015)

The possibilities of production of yet-undiscovered neutron-rich isotopes of Ca, Gd, Dy, Er, Yb, Hf, W, Os, Hg, Pb, and Th are explored in various multinucleon transfer reactions with stable and radioactive beams. The probable projectile-target combinations .... read more