Decay of a Microsecond Seniority 3 Isomeric State in Hf155

B. Alayed,R. D. Page,D. T. Joss,J. Uusitalo,C. Qi,A. D. Briscoe,M. A. M. AlAqeel,B. Andel,S. Antalic,K. Auranen, H. Ayatollahzadeh,H. Badran,L. Barber,G. Beeton,M. Birova, V. Bogdanoff,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, J. Romero,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

Physical Review C（2024）

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摘要

Excited states in the neutron-deficient nuclide Hf155 have been investigated in experiments performed at the Accelerator Laboratory of the University of Jyväskylä. The Hf155 nuclei were produced in fusion-evaporation reactions induced by beams of 295 and 315 MeV Ni58 ions bombarding an isotopically enriched Pd102 target and separated using the recoil mass separator MARA. An isomeric state having a half-life of 510(30) ns was discovered and is interpreted as a seniority υ=3, (πh11/22⊗νf7/2)27/2− configuration. The γ-ray transitions emitted in the deexcitation of the isomeric state to the ground state were identified and a level scheme was constructed, from which the excitation energy of the isomer was determined to be 2581.5(10) keV. A B(E2) value of 0.45(3) W.u. was deduced for the 105.4 keV transition depopulating the isomeric state. The deduced level scheme and B(E2) value are compared with systematics and shell-model calculations. Published by the American Physical Society 2024

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