Discovery of the α-emitting isotope ²¹⁰Pa

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2025年5月29日

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M. M. Zhang,
J. G. Wang,
L. Ma,
Z. G. Gan,
Z. Y. Zhang,
M. H. Huang,
H. B. Yang,
C. L. Yang,
A. N. Andreyev,
C. X. Yuan,
Y. L. Tian,
Y. S. Wang,
J. Y. Wang,
Y. H. Qiang,
X. L. Wu,
S. Y. Xu,
Z. Zhao,
X. Y. Huang,
Z. C. Li,
H. Zhou,
X. Zhang,
G. Xie,
L. Zhu,
F. Guan,
J. H. Zheng,
L. C. Sun,
Y. J. Li,
H. R. Yang,
L. M. Duan,
Z. W. Lu,
W. X. Huang,
L. T. Sun,
Y. He,
H. S. Xu,
Y. F. Niu,
X. T. He,
Z. Z. Ren,
S. G. Zhou

摘要

Synthesizing isotopes located far away from the line of β-stability is the core research topic in nuclear physics. However, it remains a challenge due to their tiny production cross sections and short half-lives. Here, we report on the observation of a very neutron-deficient isotope ²¹⁰Pa produced via the fusion-evaporation reaction ¹⁷⁵Lu(⁴⁰Ca, 5n)²¹⁰Pa at a newly constructed China Accelerator Facility for Superheavy Elements. The measured α-particle energy of E_α = 8284(15) keV and half-life of ${T}_{1/2}=6.{0}_{-1.1}^{+1.5}$ $T_{1 / 2} = 6 . 0_{- 1.1}^{+ 1.5}$ ms of ²¹⁰Pa allow us to extend the α-decay systematics and test the predictive power of theoretical models for heavy nuclei near the proton drip line. Based on its unhindered α-decay character, the spin and parity of ²¹⁰Pa is proposed to be (3⁺), supported by the large-scale shell model and cranked shell model calculations. This isotope is discovered with substantial statics within ∼ 3 days using intensive 2 pμA beam, demonstrating the tremendous capability of the facility for the study of heavy and superheavy nuclei.

Discovery of the α-emitting isotope 210Pa

摘要

Discovery of the α-emitting isotope ²¹⁰Pa