학술논문
Decay spectroscopy at the two-proton drip line: Radioactivity of the new nuclides 160Os and 156W
Document Type
article
Author
A.D. Briscoe; R.D. Page; J. Uusitalo; D.T. Joss; M.A.M. AlAqeel; B. Alayed; B. Andel; S. Antalic; K. Auranen; H. Ayatollahzadeh; H. Badran; L. Barber; G. Beeton; M. Birova; V. Bogdanoff; R.M. Clark; J.G. Cubiss; D.M. Cullen; J. Deary; U. Forsberg; T. Grahn; P.T. Greenlees; J.B. Hilton; A. Illana; H. Joukainen; D.S. Judson; R. Julin; H. Jutila; J.M. Keatings; M. Labiche; M. Leino; M.C. Lewis; J. Louko; M. Luoma; I. Martel; A. McCarter; P.P. McKee; P. Mosat; S.N. Nathaniel; O. Neuvonen; D. O'Donnell; J. Ojala; C.A.A. Page; A.M. Plaza; J. Pakarinen; P. Papadakis; E. Parr; J. Partanen; P. Rahkila; P. Ruotsalainen; M. Sandzelius; J. Sarén; B. Saygi; J. Smallcombe; J.F. Smith; J. Sorri; C.M. Sullivan; S. Szwec; H. Tann; A. Tolosa-Delgado; E. Uusikylä; M. Venhart; L.J. Waring; G. Zimba
Source
Physics Letters B, Vol 847, Iss , Pp 138310- (2023)
Subject
Language
English
ISSN
0370-2693
Abstract
The radioactivity of 76160Os84 and 74156W82 that lie at the two-proton drip line has been measured in an experiment performed at the Accelerator Laboratory of the University of Jyväskylä. The 160Os nuclei were produced using fusion-evaporation reactions induced by a beam of 310 MeV 58Ni ions bombarding a 106Cd target. The 160Os ions were separated in flight using the recoil separator MARA and implanted into a double-sided silicon strip detector, which was used to measure their decays. The α decays of the ground state of 160Os (Eα = 7092(15) keV, t1/2 = 97−32+97 μs) and its isomeric state (Eα = 8890(10) keV, t1/2 = 41−9+15 μs) were measured, allowing the excitation energy of the isomer to be determined as 1844(18) keV. These α-decay properties and the excitation energy of the isomer are compared with systematics. The α decays were correlated with subsequent decays to investigate the β decays of the ground state of 156W, revealing that unlike its isotones, both low-lying isomers were populated in its daughter nuclide, 156Ta. An improved value for the half-life of the proton-decaying high-spin isomeric state in 73156Ta83 of 333−22+25 ms was obtained in a separate experiment using the same experimental systems with a 102Pd target. This result was employed to improve the precision of the half-life determined for 156W, which was measured as 157−34+57 ms.