94 β -Decay Half-Lives of Neutron-Rich Cs 55 to <mml:math xmlns:mml="http://www.w3.…
2017; American Physical Society; Volume: 118; Issue: 7 Linguagem: Inglês
10.1103/physrevlett.118.072701
ISSN1092-0145
AutoresJ. Wu, S. Nishimura, G. Lorusso, P. Möller, E. Ideguchi, P. H. Regan, G. S. Simpson, P.-A. Söderström, P. M. Walker, H. Watanabe, Z. Y. Xu, H. Baba, F. Browne, R. Daido, P. Doornenbal, Y. Fang, N. Fukuda, G. Gey, T. Isobe, Z. Korkulu, Pilsoo Lee, Jinyang Liu, Z. Li, Z. Patel, V. H. Phong, S. Rice, H. Sakuraï, L. Sinclair, T. Sumikama, M. Tanaka, A. Yagi, Y. L. Ye, R. Yokoyama, G. X. Zhang, D. S. Ahn, T. Alharbi, N. Aoi, F. L. Bello Garrote, G. Benzoni, A. M. Bruce, R. Carroll, K. Y. Chae, Z. Dombrádi, A. Estradé, A. Gottardo, C. J. Griffin, N. Inabe, D. Kameda, H. Kanaoka, I. Kojouharov, F. G. Kondev, T. Kubo, S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, G. J. Lane, E. J. Lee, T. Lokotko, G. Lotay, C.-B. Moon, D. Murai, H. Nıshıbata, I. Nishizuka, Cristina Niță, A. Odahara, Zs. Podolyák, O. J. Roberts, H. Schaffner, C. Shand, Y. Shimizu, Hiroaki Suzuki, H. Takeda, J. Taprogge, S. Terashima, Z. Vajta, Satoru Yoshida,
Tópico(s)Quantum Chromodynamics and Particle Interactions
ResumoThe β-decay half-lives of 94 neutron-rich nuclei ^{144-151}Cs, ^{146-154}Ba, ^{148-156}La, ^{150-158}Ce, ^{153-160}Pr, ^{156-162}Nd, ^{159-163}Pm, ^{160-166}Sm, ^{161-168}Eu, ^{165-170}Gd, ^{166-172}Tb, ^{169-173}Dy, ^{172-175}Ho, and two isomeric states ^{174m}Er, ^{172m}Dy were measured at the Radioactive Isotope Beam Factory, providing a new experimental basis to test theoretical models. Strikingly large drops of β-decay half-lives are observed at neutron-number N=97 for _{58}Ce, _{59}Pr, _{60}Nd, and _{62}Sm, and N=105 for _{63}Eu, _{64}Gd, _{65}Tb, and _{66}Dy. Features in the data mirror the interplay between pairing effects and microscopic structure. r-process network calculations performed for a range of mass models and astrophysical conditions show that the 57 half-lives measured for the first time play an important role in shaping the abundance pattern of rare-earth elements in the solar system.
Referência(s)