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 1056764
562 <6/8> 액체금속 및 물의 과냉각 현상과 국소구조와의 관계 : 정전기 공중부양 기술 및 dynamic diamond anvil cell 2011.06.07 106152
561 <11/16> Study of carrier transport and charging effects in organic devices 2011.11.10 105996
560 <4/27> RENO Reactor Neutrino Experiment 2011.04.18 105994
559 <11/13> Computer-Aided Engineering for Nucleic Acid Nanostructures 2013.11.07 105987
558 2014학년도 2학기 콜로퀴움 일정 2014.09.11 105861
557 <5/27(수) 오후4:30분>Controlling phases in epitaxial transition metal oxide thin films 2015.05.21 105841
556 <9/11> Complex networks in technology, biology and sociology 2009.09.04 105810
555 <11/9> Bosons in high Tc superconductors: an experimental survey 2011.10.31 105273
554 <Nov. 8(Wed.) 4:30 PM> 연성물질 기반 위상학적 결함구조의 상전이와 응 2017.11.01 104740
553 <12/4> The "Physics" of Climate Change 2009.12.02 104736
552 <4/16> Lasers, Microscopes, and Superconductors: Laser Scanning Microscopy of Superconducting Circuits 2014.04.10 104120
551 <6/2>백색 LED를 이용한 반도체조명에 관하여 2006.05.29 104078
550 <4/18> Action-angle variables for the near-horizon extreme black hole particle dynamics 2012.04.17 104032
549 <2/1> The Surface Science of Adsorption on Crystalline Ferroelectric Polymer Surfaces 2010.01.25 103921
548 <Oct.10(Wed.) 4:30 PM> Standard Model of Cosmology and Beyond 2018.09.21 102934
547 <1/24> Basics of Gravitational Perturbatiosn 2011.01.19 102754
546 2014학년도 1학기 콜로퀴움 일정 2014.03.03 102360
545 <8/11>Cooking up elements in the universe: Recent activities at HRIBF 2009.08.11 102249
544 <6/1> Electron phonon coupling effect in 4d transition metal oxide magnetism 2011.05.26 101801
543 <8/4> Remarks on the Scalar Graviton and Consistency of Horava Gravity 2010.07.28 101366