logo

korean english

게시판

Home > 게시판 > 세미나

아래와 같이 세미나를 개최하오니 많이 참석해 주시기 바랍니다.

 

아 래

 

제목: The rapid neutron capture nucleosynthesis: A hot topic in the Nuclear Astrophysics study

연사: 안 성 훈 박사 (JINA/NSCL)

일시: 2014 7 21() 16:00

장소: 삼성학술정보관 2층 프리젠테이션룸

초록:

As we understand properties of nuclei, we can explain many phenomena with the information in astrophysics.

For example, mass, excitation energies, spin and parities, cross sections and decay life times for any interesting nucleus can be applied to the astrophysics models such as nucleosynthesis calculation to explain the observed abundance pattern of elements in astrophysics. Among many nucleosynthesis processes, the rapid neutron capture process,

called r-process, is believed to be responsible for half of elements heavier than iron but still under the questions due to the absence of the observational sample as well as the involved nuclei are very neutron-rich and far from the stability which

have not studied much so far

In this talk, I will present two interesting cross sections measurements related to the r-process. One will be 80Ge(d,p)

neutron transfer reaction in inverse kinematics performed at Holifield Radioactive Ion Facility,

Oak Ridge National Laboratory. Recent sensitivity studies about the main r-process found that changes of reaction rates on only certain candidates of nuclei (all around neutron closed shells, e.g. 80Ge) produce a global effect on the abundance

pattern. This experimental result reduced the uncertainty of the reaction rates of 80Ge(n,g)81Ge reaction to help accurate

r-process calculations.

 

Another will be 75Ga(a,n)78As reaction in inverse kinematics. This will be performed at National Superconducting Cyclotron Laboratory, Michigan State University next year. Since the main r-process model could not reproduce a region of Z = 38 - 47 on the observed abundance pattern, a new possible model, called the weak r-process, was suggested as the charged

particle reactions such as (a,n) occurred in early stages of core collapse supernovae. However, due to experimental lack

of reaction rates on the involved nuclei the uncertainty of the model is still too big. This experiment was proposed to help

reducing its uncertainty. In this experiment, the new gas cell target, the new neutron long-counter and the position

sensitive ionization counter will be introduced as well as the NSCL Digital Data Acquisition System (DDAS).

 

Finally, many countries including the United States have invested in either upgrades to existing facilities or new facilities to make studies of neutron-rich nuclei possible and produce exciting results about the r-process. The Facility for Rare Isotope Beams (FRIB) in 2020, for example, will provide more than 1000 new isotopes at useful rates and 4500 isotopes available to study. Due to the advances in the beam production technique, more studies of the r-process will be performed resulting in better knowledge of the process.

 

 
번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1089587
137 <Nov.7(Wed.) 4:30 PM> Hidden-in-bulk Phase Transitions in Artificial Quantum Materials 2018.10.31 105865
136 <11/6(Tue.) 3:00pm>The Surprising Solar Gamma-ray Emission from Cosmic-Ray Interactions 2018.11.03 50261
135 <11/12(Mon.) 3:30pm>Dark Matter Probes with Astrophysical Observations 2018.11.05 59083
134 <11/9(Fri.) 11:00am>Geometrically frustrated magnetism on triangular lattice 2018.11.05 106375
133 <Nov.14(Wed.) 4:30 PM> Status and Prospects for the IceCube Neutrino Observatory 2018.11.07 80093
132 <11/13(Tue.) 11:00am>Hund’s coupling driven role of $d_{3z^2-r^2}$ in stabilizing the hole-doped antiferromagnetic state in cuprates 2018.11.09 124441
131 <Nov.21(Wed.) 4:30 PM> 핵물리학과 RAON 2018.11.15 46013
130 <11/23(Fri.) 11:00am>Barrier-bound States in Flat-band Systems 2018.11.19 56479
129 <11/21(Wed.) 2:00pm>Origin of Hawking Radiation 2018.11.20 56321
128 <Dec.5(Wed.)> 두 펄사 이야기 2018.11.28 162674
127 <Dec.12(Wed.)> First-principles studies of complex oxides interfaces 2018.12.05 66144
126 <12/20(Thu) 2:00pm> Gravitating Spinning Stars (a particle theorist's perspective) 2018.12.17 187803
125 <12/21(Fri) 3:00pm ~ > Quasilocal Smarr Relations / Expanding Universe and Dynamical Compactification Using Yang-Mills Instantons 2018.12.17 104584
124 2019학년도 1학기 콜로퀴움 일정 2019.01.08 129881
123 <1/16(Wed) 4:00pm> Band Representation Analysis of Intersecting Nodal Rings in Semiconducting Layers 2019.01.09 65483
122 <2/8(Fri) 2:00pm ~ > 5d SCFTs and Type IIB 5-brane webs 2019.02.01 56977
121 <2/8(Fri) 11:0 am ~ >Intertwined states in the pure and Nd-doped heavy fermion superconductor CeCoIn5 2019.02.08 102829
120 <3/11(Mon) 10:30 am ~ >Probing Dark Matter at LIGO and Beyond 2019.03.04 81635
119 <Mar.13(Wed.)> Physics in Medicine: Magnetic Resonance Imaging 2019.03.07 64244
118 <Mar.20(Wed.)> Connecting Thermoelectricity and Superconductivity by Pressure Bridge 2019.03.13 58518