Novel Manifestation of {alpha}-Clustering Structures: New '{alpha}+{sup 208}Pb' States in {sup 212}Po Revealed by Their Enhanced E1 Decays

Journal Article · Fri Jan 29 00:00:00 EST 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.104.042701· OSTI ID:21386766

Astier, A; Porquet, M -G ^[1]; Petkov, P ^[1]; Delion, D S ^[2]; Schuck, P ^[3]

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1. CSNSM, IN2P3-CNRS and Universite Paris-Sud, 91405 Orsay (France)
2. Horia Hulubei National Institute of Physics and Nuclear Engineering 407 Atomistilor, 077125 Bucharest (Romania)
3. IPN, IN2P3-CNRS and Universite Paris-Sud, 91406 Orsay (France)

Excited states in {sup 212}Po were populated by {alpha} transfer using the {sup 208}Pb({sup 18}O,{sup 14}C) reaction, and their deexcitation {gamma} rays were studied with the Euroball array. Several levels were found to decay by a unique E1 transition (E{sub {gamma}}<1 MeV) populating the yrast state with the same spin value. Their lifetimes were measured by the Doppler-shift attenuation method. The values, found in the range 0.1-1.4 ps, lead to very enhanced transitions, B(E1)=2x10{sup -2}-1x10{sup -3} W.u. These results are discussed in terms of an {alpha}-cluster structure which gives rise to states with non-natural-parity values, provided that the composite system cannot rotate collectively, as expected in the '{alpha}+{sup 208}Pb' case. Such states due to the oscillatory motion of the {alpha}-core distance are observed for the first time.

• OSTI ID: 21386766
• Journal Information: Physical Review Letters, Vol. 104, Issue 4; Other Information: DOI: 10.1103/PhysRevLett.104.042701; (c) 2010 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CARBON 14
CLUSTER MODEL
DE-EXCITATION
DSA METHOD
E1-TRANSITIONS
EXCITED STATES
LEAD 208
LEAD 208 REACTIONS
MEV RANGE
OXYGEN 18
PARITY
POLONIUM 212
SPIN
YRAST STATES
ALPHA DECAY RADIOISOTOPES
ANGULAR MOMENTUM
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CARBON ISOTOPES
COUNTING TECHNIQUES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
HEAVY ION REACTIONS
HEAVY NUCLEI
ISOTOPES
LEAD ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MULTIPOLE TRANSITIONS
NANOSECONDS LIVING RADIOISOTOPES
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
OXYGEN ISOTOPES
PARTICLE PROPERTIES
POLONIUM ISOTOPES
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
STABLE ISOTOPES
YEARS LIVING RADIOISOTOPES