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 1079061
196 <5/16(토)> 세미나 개최 안내 2015.05.18 217226
195 <4/25(토)> 세미나 개최 안내 2015.04.23 80864
194 <4/24(금)> 초청세미나 개최 안내 file 2015.04.13 58310
193 <4/15(수)> 세미나 개최 안내 2015.04.09 66501
192 <4/21(화)> 특별초청세미나 개최 안내 2015.04.03 82309
191 <4/7(화)> 특별초청세미나 개최 안내 2015.04.01 76079
190 <3/31(화)> 초청세미나 개최 안내 2015.03.24 77726
189 <3/13(금) pm1:00> 초청세미나 개최 안내 2015.03.09 86558
188 <3/16(월)> 초청세미나 개최 안내 2015.02.27 58939
187 2014 노벨물리학상 수상자인 나고야 대학교 아마노 히로시 교수 초청 특강 2015.02.23 61001
186 <2/10(화) 오후 2시> 특별 초청세미나 개최 안내 file 2015.02.06 77589
185 <2/9(월) 오전 11시> 특별 초청세미나 개최 안내 file 2015.02.03 71002
184 <1/16(금)> Systems biology of genetic oscillations: Application to phenotypic switches 2015.01.13 61940
183 <12/2(화)> Emergent Quantum Phenomena in SrTiO3 Heterostructures 2014.11.21 72629
182 <10/31(금)> The dynamics of composite pseudo-Goldstone Higgses 2014.10.27 59237
181 <9/23(화)> Novel resistive switching behavior of ferroelectric nanodevices file 2014.09.03 59263
180 <9/11(목)> The effects of dark matter elastic scattering on the cosmological signals 2014.09.01 66868
» <7/21(월)> The rapid neutron capture nucleosynthesis: A hot topic in the Nuclear Astrophysics study 2014.07.15 120944
178 <5/30(금)> 입자물리이론 그룹 미니 워크숍 개최 안내 2014.05.29 103211
177 <5/12(월)> Nanoscale probing of electrochemical phenomena and ionic dynamics by scanning probe microscopy 2014.05.07 98224