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Title: Stretched high-spin two-neutron-hole states in /sup 206/Pb and /sup 114/Sn via the (/ital p/,/ital t/) reaction at 168 MeV

Abstract

Two-neutron-hole excitations have been investigated via the(/ital p/,/ital t/) reaction at 168 MeV on /sup 208/Pb and/sup 116/Sn targets, up to /similar to/25 and /similar to/17 MeVexcitation energy, respectively. The kinematic conditions strongly favor high/ital L/ transfer values (/ital L//similar to/10 for Sn and /ital L//similar to/13 for Pb).High-spin stretched states are found to dominate the spectra with an evenstronger enhancement for/ital J/=((/ital l//sub 1/+(1/2)(l/sub 2//minus/1)/2))/sub /ital J//sub max// states.Angular distributions and standardlocal zero-range distorted-wave Born approximation analysis have been performedfor /sup 206/Pb. Such analysis has been extended to the/sup 114/Sn data taken at two angles. The zero-range normalizationconstant /ital D//sub 0//sup 2/ is found to be significantly smaller thanthat usually adopted at low incident energy, /ital D//sub 0//sup 2//similar to/6instead of /similar to/22. The high-spin stretched states of the valencemultiplets are distributed from 2.2 MeV up to 6.1 MeV in/sup 206/Pb, whereas they are clustered between /similar to/3.0and 3.7 MeV in /sup 114/Sn. New spectroscopic information gainedfor /ital J//sup ..pi../greater than or equal to6 levels or structures in /sup 206/Pb and/sup 114/Sn is discussed together with that of previous studies,especially the (..cap alpha..,/sup 6/He) results at high incident energy.Such comparisons show that configuration mixing is larger than predicted forthemore » higher-energy transitions in /sup 206/Pb. No significantconcentration of valence plus deep hole states could be found in/sup 206/Pb, whereas the previously known one valence plus one deepbump in /sup 114/Sn exhibits a maximum at /similar to/7.3 MeVhere mainly attributed to the(/ital g//sub 7/2/+g/sub 9/2/)/sub 8/sup +// state inagreement with the prediction of the quasiparticle phonon model.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Institut de Physique Nucleaire, 91406 Orsay CEDEX, France(FR); Institut des Sciences Nucleaire, 38026 Grenoble CEDEX, France; Departemento de Fisica, Universidad de La Plata, 1900 La Plata, Argentina; Institute for Nuclear Study, University of Tokyo, Tanashi-shi, 188 Tokyo, Japan
OSTI Identifier:
6390846
Resource Type:
Journal Article
Journal Name:
Phys. Rev. C; (United States)
Additional Journal Information:
Journal Volume: 39:6
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; HIGH SPIN STATES; ANGULAR DISTRIBUTION; LEAD 206; LEAD 208 TARGET; PROTON REACTIONS; PICKUP REACTIONS; TWO-NUCLEON TRANSFER REACTIONS; TIN 116 TARGET; ALPHA REACTIONS; DWBA; HELIUM 6; MEV RANGE 100-1000; PARITY; PARTICLE-HOLE MODEL; SPIN; SYNCHROCYCLOTRONS; TIN 114; TRITONS; VALENCE; ACCELERATORS; ANGULAR MOMENTUM; BARYON REACTIONS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; BORN APPROXIMATION; CHARGED PARTICLES; CHARGED-PARTICLE REACTIONS; CYCLIC ACCELERATORS; DIRECT REACTIONS; DISTRIBUTION; ENERGY LEVELS; ENERGY RANGE; EVEN-EVEN NUCLEI; HADRON REACTIONS; HEAVY NUCLEI; HELIUM ISOTOPES; INTERMEDIATE MASS NUCLEI; ISOTOPES; LEAD ISOTOPES; LIGHT NUCLEI; MATHEMATICAL MODELS; MEV RANGE; MULTI-NUCLEON TRANSFER REACTIONS; NUCLEAR MODELS; NUCLEAR REACTIONS; NUCLEI; NUCLEON REACTIONS; PARTICLE PROPERTIES; RADIOISOTOPES; STABLE ISOTOPES; TARGETS; TIN ISOTOPES; TRANSFER REACTIONS; 651720* - Nuclear Properties & Reactions, A=90-149, Experimental; 651920 - Nuclear Properties & Reactions, A=190-219, Experimental

Citation Formats

Gerlic, E, Guillot, J, Langevin-Joliot, H, Van de Wiele, J, Gales, S, Duhamel, G, Perrin, G, Massolo, C P, and Sakai, M. Stretched high-spin two-neutron-hole states in /sup 206/Pb and /sup 114/Sn via the (/ital p/,/ital t/) reaction at 168 MeV. United States: N. p., 1989. Web. doi:10.1103/PhysRevC.39.2190.
Gerlic, E, Guillot, J, Langevin-Joliot, H, Van de Wiele, J, Gales, S, Duhamel, G, Perrin, G, Massolo, C P, & Sakai, M. Stretched high-spin two-neutron-hole states in /sup 206/Pb and /sup 114/Sn via the (/ital p/,/ital t/) reaction at 168 MeV. United States. https://doi.org/10.1103/PhysRevC.39.2190
Gerlic, E, Guillot, J, Langevin-Joliot, H, Van de Wiele, J, Gales, S, Duhamel, G, Perrin, G, Massolo, C P, and Sakai, M. 1989. "Stretched high-spin two-neutron-hole states in /sup 206/Pb and /sup 114/Sn via the (/ital p/,/ital t/) reaction at 168 MeV". United States. https://doi.org/10.1103/PhysRevC.39.2190.
@article{osti_6390846,
title = {Stretched high-spin two-neutron-hole states in /sup 206/Pb and /sup 114/Sn via the (/ital p/,/ital t/) reaction at 168 MeV},
author = {Gerlic, E and Guillot, J and Langevin-Joliot, H and Van de Wiele, J and Gales, S and Duhamel, G and Perrin, G and Massolo, C P and Sakai, M},
abstractNote = {Two-neutron-hole excitations have been investigated via the(/ital p/,/ital t/) reaction at 168 MeV on /sup 208/Pb and/sup 116/Sn targets, up to /similar to/25 and /similar to/17 MeVexcitation energy, respectively. The kinematic conditions strongly favor high/ital L/ transfer values (/ital L//similar to/10 for Sn and /ital L//similar to/13 for Pb).High-spin stretched states are found to dominate the spectra with an evenstronger enhancement for/ital J/=((/ital l//sub 1/+(1/2)(l/sub 2//minus/1)/2))/sub /ital J//sub max// states.Angular distributions and standardlocal zero-range distorted-wave Born approximation analysis have been performedfor /sup 206/Pb. Such analysis has been extended to the/sup 114/Sn data taken at two angles. The zero-range normalizationconstant /ital D//sub 0//sup 2/ is found to be significantly smaller thanthat usually adopted at low incident energy, /ital D//sub 0//sup 2//similar to/6instead of /similar to/22. The high-spin stretched states of the valencemultiplets are distributed from 2.2 MeV up to 6.1 MeV in/sup 206/Pb, whereas they are clustered between /similar to/3.0and 3.7 MeV in /sup 114/Sn. New spectroscopic information gainedfor /ital J//sup ..pi../greater than or equal to6 levels or structures in /sup 206/Pb and/sup 114/Sn is discussed together with that of previous studies,especially the (..cap alpha..,/sup 6/He) results at high incident energy.Such comparisons show that configuration mixing is larger than predicted forthe higher-energy transitions in /sup 206/Pb. No significantconcentration of valence plus deep hole states could be found in/sup 206/Pb, whereas the previously known one valence plus one deepbump in /sup 114/Sn exhibits a maximum at /similar to/7.3 MeVhere mainly attributed to the(/ital g//sub 7/2/+g/sub 9/2/)/sub 8/sup +// state inagreement with the prediction of the quasiparticle phonon model.},
doi = {10.1103/PhysRevC.39.2190},
url = {https://www.osti.gov/biblio/6390846}, journal = {Phys. Rev. C; (United States)},
number = ,
volume = 39:6,
place = {United States},
year = {Thu Jun 01 00:00:00 EDT 1989},
month = {Thu Jun 01 00:00:00 EDT 1989}
}