期刊
ACTA PHYSICA POLONICA B
卷 46, 期 3, 页码 537-546出版社
JAGIELLONIAN UNIV PRESS
DOI: 10.5506/APhysPolB.46.537
关键词
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资金
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-FG02-96ER40983, DE-SC0001174, DE-FG02-96ER40955, DE-AC05-00OR22725, DE-FG02-96ER40978]
- U.S. Department of Energy, National Nuclear Security Administration Stewardship Science Academic Alliance Program [DE-FG52-08NA28552, DE-NA0002132]
- National Science Foundation [PHY-1067806, PHY-1102511, PHY-0722822]
- United Kingdom Science and Technology Facilities Council (STFC) [ST/J000051/1]
- Science and Technology Facilities Council [ST/J000051/1, ST/L005743/1] Funding Source: researchfish
- STFC [ST/L005743/1, ST/J000051/1] Funding Source: UKRI
Direct reaction techniques are powerful tools to study the single-particle nature of nuclei. Performing direct reactions on short-lived nuclei requires radioactive ion beams produced either via fragmentation or the Isotope Separation OnLine (ISOL) method. Some of the most interesting regions to study with direct reactions are close to the magic numbers where changes in shell structure can be tracked. These changes can impact the final abundances of explosive nucleosynthesis. The structure of the chain of tin isotopes is strongly influenced by the Z = 50 proton shell closure, as well as the neutron shell closures lying in the neutron-rich, N = 82, and neutron-deficient, N = 50, regions. Here, we present two examples of direct reactions on exotic tin isotopes. The first uses a one-neutron transfer reaction and a low-energy reaccelerated ISOL beam to study states in Sn-131 from across the N = 82 shell closure. The second example utilizes a one-neutron knockout reaction on fragmentation beams of neutron-deficient Sn-106,Sn-108. In both cases, measurements of gamma rays in coincidence with charged particles proved to be invaluable.
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