Alpha decay studies of {sup 189}Bi{sup m}, {sup 190}Po and {sup 180 }Pb using a rapidly rotating recoil catcher wheel system

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The {alpha} decays of very neutron deficient nuclei near the Z = 82 closed proton shell are of interest because they provide us with structure information that is relevant with regard to the shell model. We used a rapidly rotating recoil catcher wheel system to study the {alpha} decays of {sup 189}Bi{sup {ital m}}, {sup 190}Po, and {sup 180}Pb. The system works as follows. Recoils from the back of the target, after passing through an Al degrader placed behind the target, are stopped in 300-{mu}g/cm{sup 2} Al catcher foils fixed at the edges of the wheel. These are inclined at ... continued below

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9 p.

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Batchelder, J.C.; Toth, K.S. & Moltz, D.M. September 1, 1996.

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  • Batchelder, J.C. Louisiana State Univ., Baton Rouge, LA (United States)
  • Toth, K.S. Oak Ridge National Lab., TN (United States)
  • Moltz, D.M. Lawrence Berkeley Laboratory, CA (United States)|University of California, Berkeley, CA (United States)

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The {alpha} decays of very neutron deficient nuclei near the Z = 82 closed proton shell are of interest because they provide us with structure information that is relevant with regard to the shell model. We used a rapidly rotating recoil catcher wheel system to study the {alpha} decays of {sup 189}Bi{sup {ital m}}, {sup 190}Po, and {sup 180}Pb. The system works as follows. Recoils from the back of the target, after passing through an Al degrader placed behind the target, are stopped in 300-{mu}g/cm{sup 2} Al catcher foils fixed at the edges of the wheel. These are inclined at an angle of 20 degrees with respect to the beam to maximize the catcher efficiency while keeping the thickness that {alpha} particles must travel in order to emerge of the Al foil to a minimum. This arrangement results in an effective thickness of {approx} 900 {mu}g/cm{sup 2} for recoils, but only 150 {mu}g/cm{sup 2} for the emitted {alpha} particles. Stopped recoils are then rotated between an array of 6 Si detectors in series (solid angle of 8% of 4{pi}). Half-life information can be obtained by determining the difference in counts between the detectors. This instrument has proven to be an effective tool for the study of nuclei far from stability with half-lives in the range of 1-50 ms.

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9 p.

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INIS; OSTI as DE96013796

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  • International conference on nuclear structure around the turn of the century, Crete (Greece), 1-6 Jul 1996

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  • Other: DE96013796
  • Report No.: CONF-9607147--1
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 288984
  • Archival Resource Key: ark:/67531/metadc668267

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  • September 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 15, 2016, 12:41 p.m.

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Batchelder, J.C.; Toth, K.S. & Moltz, D.M. Alpha decay studies of {sup 189}Bi{sup m}, {sup 190}Po and {sup 180 }Pb using a rapidly rotating recoil catcher wheel system, article, September 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc668267/: accessed October 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.