Yrast excitations around {sup 132}Sn: The two and three valence- proton N = 82 isotones {sup 134}Te and {sup 135}I
Conference
·
OSTI ID:417603
- Purdue Univ., Lafayette, IN (United States); and others
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.
- Research Organization:
- Argonne National Lab., IL (United States). Physics Div.; Purdue Univ., Lafayette, IN (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States); Science and Engineering Research Council, Swindon (United Kingdom); Polish State Committee for Scientific Research (Poland)
- DOE Contract Number:
- FG02-87ER40346; W-31109-ENG-38
- OSTI ID:
- 417603
- Report Number(s):
- ANL/PHY/CP--91408; CONF-9607156--2; ON: DE97000357; CNN: Grant GRH 71161; Grant 1044-PO3-96-10
- Country of Publication:
- United States
- Language:
- English
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