Yrast excitations around {sup 132}Sn: The two and three valence- proton N = 82 isotones {sup 134}Te and {sup 135}I

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Large multidetector {gamma}-ray arrays, which can separate the prompt {gamma}-ray cascades within a single fission product nucleus (of moderate yield) from the bulk of prompt {gamma}-rays, has now opened new prospects for studies of yrast excitations in {sup 132}Sn and the few valence particle nuclei around it. Measurements were performed at Eurogam II using a {sup 248}Cm source. This paper features the results for the two and three valence proton N=82 isotones {sup 134}Te and {sup 135}I which exhibit simple clearcut excitation modes, resembling {sup 210}Po and {sup 211}At, their well studied N=126 counterparts in the {sup 208}Pb region. A ... continued below

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8 p.

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Daly, P. J.; Zhang, C. T. & Bhattacharyya, P. November 1996.

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Description

Large multidetector {gamma}-ray arrays, which can separate the prompt {gamma}-ray cascades within a single fission product nucleus (of moderate yield) from the bulk of prompt {gamma}-rays, has now opened new prospects for studies of yrast excitations in {sup 132}Sn and the few valence particle nuclei around it. Measurements were performed at Eurogam II using a {sup 248}Cm source. This paper features the results for the two and three valence proton N=82 isotones {sup 134}Te and {sup 135}I which exhibit simple clearcut excitation modes, resembling {sup 210}Po and {sup 211}At, their well studied N=126 counterparts in the {sup 208}Pb region. A search was made for new {sup 135}I transitions by setting a single coincidence gate on 1134 keV {gamma}-rays; strong 288, 572, 690, 725, 1661, 1695, and 2247 keV coincident {gamma}-rays were identified as {sup 135}I {gamma}-rays. In summary, yrast excitations to above 5.5 MeV excitation energy in the 2- and 3-proton nuclei {sup 134}Te and {sup 135}I have been established and interpreted with help of shell model calculations using empirical nucleon-nucleon interactions. This opens possibilities for exploring simple excitation modes in the {sup 132}Sn region under conditions comparable with but not identical to those in the well-studied {sup 208}Pb region.

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8 p.

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INIS; OSTI as DE97000357

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  • Conference on nuclear structure at the limits, Argonne, IL (United States), 22-26 Jul 1996

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  • Other: DE97000357
  • Report No.: ANL/PHY/CP--91408
  • Report No.: CONF-9607156--2
  • Grant Number: FG02-87ER40346;W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 417603
  • Archival Resource Key: ark:/67531/metadc688450

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  • November 1996

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  • July 25, 2015, 2:20 a.m.

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  • Dec. 11, 2015, 3:27 p.m.

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Daly, P. J.; Zhang, C. T. & Bhattacharyya, P. Yrast excitations around {sup 132}Sn: The two and three valence- proton N = 82 isotones {sup 134}Te and {sup 135}I, article, November 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc688450/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.