Neutron single particle structure in 131Sn and direct neutron capture cross sections

Journal Article · Sun Jan 01 00:00:00 EST 2012 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.109.172501· OSTI ID:1056965

Kozub, R. L. ^[1]; Arbanas, Goran ^[2]; Adekola, A. S. ^[3]; Bardayan, Daniel W ^[2]; Blackmon, Jeffery C ^[4]; Chae, Kyung Yuk ^[2]; Chipps, K. ^[5]; Cizewski, J. A. ^[6]; Erikson, Luke ^[5]; Hatarik, Robert ^[6]; Hix, William Raphael ^[2]; Jones, K. L. ^[7]; Krolas, W. ^[8]; Liang, J Felix ^[2]; Ma, Z. ^[7]; Matei, Catalin ^[9]; Moazen, Brian ^[7]; Nesaraja, Caroline D ^[2]; Pain, Steven D ^[2]; Shapira, Dan ^[2] ; Smith, Michael Scott ^[2]; Swan, T. P. ^[10]

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1. Tennessee Technological University
2. ORNL
3. Ohio University, Athens
4. Louisiana State University
5. Colorado School of Mines, Golden
6. Rutgers University
7. University of Tennessee, Knoxville (UTK)
8. University of Warsaw
9. Oak Ridge Associated Universities (ORAU)
10. University of Surrey, UK

Recent calculations suggest that the rate of neutron capture by 130Sn has a significant impact on late-time nucleosynthesis in the r-process. Direct capture into low-lying bound states is expected to be significant in neutron capture near the N=82 closed shell, so r- process reaction rates may be strongly impacted by the properties of neutron single particle states in this region. In order to investigate these properties, the (d, p) reaction has been studied in inverse kinematics using a 630 MeV beam of 130Sn (4.8 MeV/u) and a (CD2)n target. An array of Si strip detectors, including SIDAR and an early implementation of the ORRUBA, was used to detect reaction products. Results for the 130Sn(d, p)131Sn reaction are found to be very similar to those from the previously reported 132Sn(d, p)133Sn reaction. Direct-semidirect (n, ) cross section calculations, based for the first time on experimental data, are presented. The uncertainties in these cross sections are thus reduced by orders of magnitude from previous estimates.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Holifield Radioactive Ion Beam Facility (HRIBF)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1056965
• Journal Information: Physical Review Letters, Vol. 109, Issue 17; ISSN 0031--9007
• Country of Publication: United States
• Language: English