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Title

Evidence of a new state in 11Be observed in the 11Li β-decay

AuthorsMadurga, Miguel CSIC; García Borge, María José CSIC ORCID; Alcorta, Martín CSIC ORCID; Fraile, Luis M. CSIC ORCID; Fynbo, H. O. U.; Jonson, B.; Kirsebom, O.; Martínez Pinedo, Gabriel; Nilsson, T.; Nyman, G.; Perea, Ángel CSIC ORCID; Poves, Alfredo CSIC ORCID; Riisager, K.; Tengblad, Olof CSIC ORCID ; Tengborn, E.; Walle, J. van der
KeywordsRadioactivity 11Li(β−) [from Ta(p, X)]
Measured β-delayed 4,6He energy
Charged particles coincidences
Identification of new level in 11Be
Spin and parity assignment
Partial decay branches
[PACS] Relation with nuclear matrix elements and nuclear structure
[PACS] Properties of specific nuclei listed by mass ranges:6 ≤ A ≤ 19
[PACS] Spin, parity, and isobaric spin
Issue Date27-May-2009
PublisherElsevier
CitationPhysics Letters B 677(5): 255–259 (2009)
AbstractCoincidences between charged particles emitted in the β-decay of 11Li were observed using highly segmented detectors. The breakup channels involving three particles were studied in full kinematics allowing for the reconstruction of the excitation energy of the 11Be states participating in the decay. In particular, the contribution of a previously unobserved state at 16.3 MeV in 11Be has been identified selecting the α + 7He → α + 6He + n channel. The angular correlations between the α particle and the center of mass of the 6He + n system favors spin and parity assignment of 3/2− for this state as well as for the previously known state at 18 MeV.
Description5 pages, 1 table, 3 figures.-- PACS nrs.: 23.40.Hc; 27.20.+n; 21.10.Hw.-- Printed version published Jun 29, 2009.-- ArXiv available at: http://arxiv.org/abs/0904.4212v1
Publisher version (URL)http://dx.doi.org/10.1016/j.physletb.2009.05.050
URIhttp://hdl.handle.net/10261/16014
DOI10.1016/j.physletb.2009.05.050
ISSN0370-2693
Appears in Collections:(IFT) Artículos
(CFMAC-IEM) Artículos

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