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Signatures of the Z=82 shell closure in alpha-decay process
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.ORCID iD: 0000-0002-1406-5695
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2013 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 110, no 24, 242502Article in journal (Refereed) Published
Abstract [en]

In recent experiments at the velocity filter Separator for Heavy Ion reaction Products (SHIP) (GSI, Darmstadt), an extended and improved set of α-decay data for more than 20 of the most neutron-deficient isotopes in the region from lead to thorium was obtained. The combined analysis of this newly available α-decay data, of which the Po186 decay is reported here, allowed us for the first time to clearly show that crossing the Z=82 shell to higher proton numbers strongly accelerates the α decay. From the experimental data, the α-particle formation probabilities are deduced following the Universal Decay Law approach. The formation probabilities are discussed in the framework of the pairing force acting among the protons and the neutrons forming the α particle. A striking resemblance between the phenomenological pairing gap deduced from experimental binding energies and the formation probabilities is noted. These findings support the conjecture that both the N=126 and Z=82 shell closures strongly influence the α-formation probability.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2013. Vol. 110, no 24, 242502
Keyword [en]
Combined analysis, Decay law, Decay process, Experimental datum, Heavy-ion reactions, Particle formations, Shell closures, Velocity filters
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URN: urn:nbn:se:kth:diva-134254DOI: 10.1103/PhysRevLett.110.242502ISI: 000320167600003Scopus ID: 2-s2.0-84879109137OAI: oai:DiVA.org:kth-134254DiVA: diva2:665960
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Swedish Research Council
Note

QC 20131121

Available from: 2013-11-21 Created: 2013-11-20 Last updated: 2017-12-06Bibliographically approved

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