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

Journal Article · Thu Jun 01 00:00:00 EDT 1989 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.39.2190· OSTI ID:6390846

Gerlic, E; Guillot, J; Langevin-Joliot, H; Van de Wiele, J; Gales, S; Duhamel, G; Perrin, G; Massolo, C P; Sakai, M

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.

• Research Organization: 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 ID: 6390846
• Journal Information: Phys. Rev. C; (United States), Vol. 39:6
• Country of Publication: United States
• Language: English

Related Subjects

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
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MEV RANGE 100-1000
PARITY
PARTICLE-HOLE MODEL
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SYNCHROCYCLOTRONS
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ACCELERATORS
ANGULAR MOMENTUM
BARYON REACTIONS
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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
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LEAD ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MEV RANGE
MULTI-NUCLEON TRANSFER REACTIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
PARTICLE PROPERTIES
RADIOISOTOPES
STABLE ISOTOPES
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