RT Journal Article
T1 Observation and Spectroscopy of New Proton-Unbound Isotopes 30Ar and 29Cl: An Interplay of Prompt Two-Proton and Sequential Decay
A1 Mukha, I
A1 Dueñas Díaz, José Antonio
A1 Marquínez Durán, Gloria
A1 Martel Bravo, Ismael
A1 Ordúz, A. K.
A1 Sánchez Benítez, Ángel Miguel
A1 Zhukov, M. V.
AB Previously unknown isotopes Ar30 and Cl29 have been identified by measurement of the trajectories of their in-flight decay products S28+p+p and S28+p, respectively. The analysis of angular correlations of the fragments provided information on decay energies and the structure of the parent states. The ground states of Ar30 and Cl29 were found at 2.25+0.15−0.10 and 1.8±0.1  MeV above the two- and one-proton thresholds, respectively. The lowest states in Ar30 and Cl29 point to a violation of isobaric symmetry in the structure of these unbound nuclei. The two-proton decay has been identified in a transition region between simultaneous two-proton and sequential proton emissions from the Ar30 ground state, which is characterized by an interplay of three-body and two-body decay mechanisms. The first hint of a fine structure of the two-proton decay of Ar∗30(2+) has been obtained by detecting two decay branches into the ground and first-excited states of the S28 fragment.
PB American Physical Society
SN 0031-9007
SN 1079-7114
YR 2015
FD 2015
LK http://hdl.handle.net/10272/11483
UL http://hdl.handle.net/10272/11483
LA eng
NO Mukha, I., Dueñas Díaz, J.A., Marquínez Durán, G., Martel Bravo, I., Ordúz, A. K., Sánchez Benítez, A.M., Zhukov, M.V... [et. al.]: "Observation and Spectroscopy of New Proton-Unbound Isotopes 30Ar and 29Cl: An Interplay of Prompt Two-Proton and Sequential Decay". Physical Review Letters. Vol. 115, 202501, (2015). DOI: 10.1103/PhysRevLett.115.202501
NO A. G., S. K., S. R., and P. S. were supported by theHelmholtz Association Grant No. IK-RU-002. L. V. G.was partly supported by the Ministry of Education andScience of the Russian Federation Grant No. NSh-932.2014.2. A. F., A. G., L. V. G., S. K., P. S., and R. S.were partly supported by the Russian Foundation forBasic Research Grant No. 14-02-00090-a. This workwas partly supported by the Polish National ScienceCenter under Contract No. UMO-2011/01/B/ST2/01943.A. A. C. acknowledges support by the Polish Ministry ofScience and Higher Education by Grant No. 0079/DIA/2014/43 (Grant Diamentowy). M. P. and X. X. are gratefulfor a support from the Helmholtz International Centerfor FAIR (HIC for FAIR). Y. L. was supported by theHelmholtz-CAS Joint Research Group Grant No. HCJRG-108. J. M. E. acknowledges support from the FPA2009-08848 contract (MICINN, Spain)
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026