/ Experiment-Nucl

Unexpected high-energy γ emission from decaying exotic nuclei

Gottardo, A. (Orsay, IPN) ; Verney, D. (Orsay, IPN) ; Deloncle, I. (CSNSM, Orsay) ; Péru, S. (CEA DAM) ; Delafosse, C. (Orsay, IPN) ; Roccia, S. (CSNSM, Orsay) ; Matea, I. (Orsay, IPN) ; Sotty, C. (Bucharest, IFIN-HH) ; Andreoiu, C. (Simon Fraser U., Dept. Chem.) ; Costache, C. (Bucharest, IFIN-HH) ; Delattre, M.-C. (Orsay, IPN) ; Etilé, A. (CEA DAM) ; Franchoo, S. (Orsay, IPN) ; Gaulard, C. (CSNSM, Orsay) ; Guillot, J. (Orsay, IPN) ; Ibrahim, F. (Orsay, IPN) ; Lebois, M. (Orsay, IPN) ; MacCormick, M. (Orsay, IPN) ; Marginean, N. (Bucharest, IFIN-HH) ; Marginean, R. (Bucharest, IFIN-HH) ; Martini, M. (IRFU, SPhN, Saclay) ; Mihai, C. (Bucharest, IFIN-HH) ; Mitu, I. (Bucharest, IFIN-HH) ; Olivier, L. (Orsay, IPN) ; Portail, C. (Orsay, IPN) ; Qi, L. (Orsay, IPN) ; Roussière, B. (Orsay, IPN) ; Stan, L. (Bucharest, IFIN-HH) ; Testov, D. (Dubna, JINR) ; Wilson, J. (Orsay, IPN) ; Yordanov, D.T. (Orsay, IPN)

Published in: Phys.Lett.
Year: 2017
Vol.: B772
Page No: 359-362
Pages: 4
Year: 2017-09-10 published

Abstract: The N=52 Ga83 β decay was studied at ALTO. The radioactive 83 Ga beam was produced through the ISOL photofission technique and collected on a movable tape for the measurement of γ -ray emission following β decay. While β -delayed neutron emission has been measured to be 56–85% of the decay path, in this experiment an unexpected high-energy 5–9 MeV γ -ray yield of 16(4)% was observed, coming from states several MeVs above the neutron separation threshold. This result is compared with cutting-edge QRPA calculations, which show that when neutrons deeply bound in the core of the nucleus decay into protons via a Gamow–Teller transition, they give rise to a dipolar oscillation of nuclear matter in the nucleus. This leads to large electromagnetic transition probabilities which can compete with neutron emission, thus affecting the β -decay path. This process is enhanced by an excess of neutrons on the nuclear surface and may thus be a common feature for very neutron-rich isotopes, challenging the present understanding of decay properties of exotic nuclei.

Web-Page: http://inspirehep.net/record/1609113/files/scoap3-fulltext.pdf

Total numbers of views: 189
Numbers of unique views: 98
DOI: 10.1016/j.physletb.2017.06.050
 Record created 2017-08-01, last modified 2017-08-01

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