Accelerator Mass Spectrometry in Laboratory Nuclear Astrophysics

6th Nuclear Physics in Astrophysics

物理学;天文学

Nusair, O.^1 ; Bauder, W.^2 ; Gyürky, G.^3 ; Paul, M.^4 ; Collon, P.^2 ; Fülöp, Zs.^3 ; Greene, J.^1 ; Kinoshita, N.^5 ; Palchan, T.^1 ; Pardo, R.^1 ; Rehm, K.E.^1 ; Scott, R.^1 ; Vondrasek, R.^1

Physics Division, Argonne National Laboratory, Argonne

IL

60439, United States^1

Physics Department, University of Notre Dame, Notre Dame

IN

46556, United States^2

MTA Atomki, Debrecen

H-4001, Hungary^3

Racah Institute of Physics, Hebrew University, Jerusalem

91904, Israel^4

Tandem Accelerator Complex, Research Facility Ctr for Science and Technology, U. of Tsukuba, Tsukuba, Japan^5

关键词: Accelerator mass spectrometry;    Activation method;    Argonne National Laboratory;    Long-lived radionuclides;    Measurements of;    Nuclear astro-physics;    Stellar nuclear reaction;    Superconducting linear accelerators;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/665/1/012076/pdf
DOI  :  10.1088/1742-6596/665/1/012076

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

The extreme sensitivity and discrimination power of accelerator mass spectrometry (AMS) allows for the search and the detection of rare nuclides either in natural samples or produced in the laboratory. At Argonne National Laboratory, we are developing an AMS setup aimed in particular at the detection of medium and heavy nuclides, relying on the high ion energy achievable with the ATLAS superconducting linear accelerator and on gas-filled magnet isobaric separation. The setup was recently used for the detection of the146Sm p-process nuclide and for a new determination of the146Sm half-life (68.7 My). AMS plays an important role in the measurement of stellar nuclear reaction cross sections by the activation method, extending thus the technique to the study of production of long-lived radionuclides. Preliminary measurements of the147Sm(γ,n)146Sm are described. A measurement of the142Nd(α,γ)146Sm and142Nd(α,n)145Sm reactions is in preparation. A new laser-ablation method for the feeding of the Electron Cyclotron Resonance (ECR) ion source is described.