Alpha and helion particle charge radius difference determined from quantum-degenerate helium

IF 44.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2025-05-22 DOI:10.1126/science.adj2462

Y. van der Werf, K. Steinebach, R. Jannin, H. L. Bethlem, K. S. E. Eikema

引用次数: 0

Abstract

Accurate spectroscopic measurements of calculable systems provide a powerful method for testing the Standard Model and extracting fundamental constants. Recently, spectroscopic measurements of finite nuclear size effects in normal and muonic hydrogen resulted in unexpectedly large adjustments of the proton charge radius and the Rydberg constant. We measured the 2³S→2¹S transition frequency in a Fermi gas of ³He with an order of magnitude higher accuracy than determined previously. Together with a previous measurement in a ⁴He Bose-Einstein condensate, a squared charge radius difference r_h² – r_α² = 1.0757(12)_exp(9)_theo fm² was determined between the helion and alpha particle. This measurement provides a stringent benchmark for nuclear structure calculations.

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由量子简并氦确定的α和氦粒子电荷半径差

可计算系统的精确光谱测量为检验标准模型和提取基本常数提供了有力的方法。最近，对正常氢和介子氢的有限核尺寸效应的光谱测量导致了质子电荷半径和里德伯常数意想不到的大调整。我们测量了3He费米气体中23S→21S的跃迁频率，精度比以前高了一个数量级。结合先前在4He玻色-爱因斯坦凝聚体中的测量结果，确定了helion和α粒子之间的平方电荷半径差rh2 - rα2 = 1.0757(12)exp(9)theo fm2。这一测量为核结构计算提供了严格的基准。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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