新型拉伸耦合方案在88Sr中产生磁偶极子带

IF 4.5 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B Pub Date : 2025-02-14 DOI:10.1016/j.physletb.2025.139324

B. Das , Md.S.R. Laskar , R. Palit , S. Rajbanshi , V. Malik , F.S. Babra , S. Chattopadhyay , Biswajit Das , P. Dey , A. Kundu

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引用次数: 0

摘要

用13C + 82Se反应填充了88Sr的高自旋态。利用多普勒频移衰减法（dsam）研究了由6个能量为605 - 490 - 311 - 267 - 528 - 974 keV的磁偶极子跃迁组成的负偶极子带的结构，其长度可达13−。从测量的寿命中提取的跃迁强度随着自旋的增加而增加，然后在π = 10−之后下降。观测到的伽玛射线能量行为和跃迁速率用一种新的拉伸耦合格式解释。在这个几何模型中，一个粒子-粒子吸引剪切和两个粒子-空穴排斥剪切之间的相互作用被用来解释观察到的行为。这在任何原子核中首次证实了两个粒子叶片之间存在吸引剪切。

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Emergence of magnetic dipole band in 88Sr due to novel stretched coupling scheme

High spin states of ⁸⁸Sr have been populated using ¹³C + ⁸²Se reaction. The structure of a negative parity band consisting of six magnetic dipole transitions with energies of 605 - 490 - 311 - 267 - 528 - 974 keV extending up to

I^{π}

13^{-}

was investigated through lifetimes measurements using Doppler Shift Attenuation Method (dsam). The extracted transition strengths from the measured lifetimes initially increase with spin and then decrease beyond

I^{π}

10^{-}

. The observed gamma-ray energy behaviour and that of transition rates were explained using a novel stretched coupling scheme. In this geometrical model, an interplay between a particle-particle attractive shears and two particle-hole repulsive shears has been invoked to explain the observed behaviour. This confirms the existence of an attractive shears between two particle blades for the first time in any nuclei.

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来源期刊

Physics Letters B 物理-物理：综合

CiteScore

9.10

自引率

6.80%

发文量

647

审稿时长

3 months

期刊介绍： Physics Letters B ensures the rapid publication of important new results in particle physics, nuclear physics and cosmology. Specialized editors are responsible for contributions in experimental nuclear physics, theoretical nuclear physics, experimental high-energy physics, theoretical high-energy physics, and astrophysics.