高能物理与核物理
高能物理與覈物理
고능물리여핵물리
HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS
2002年
5期
445-449
,共5页
张玉虎%温书贤%竺礼华%M.Koizumi%M.Oshima%Y.Toh%A.Osa%T.Shizuma%T.Hayakawa%M.Sugawara%H.Kusakari%T.Morikawa
張玉虎%溫書賢%竺禮華%M.Koizumi%M.Oshima%Y.Toh%A.Osa%T.Shizuma%T.Hayakawa%M.Sugawara%H.Kusakari%T.Morikawa
장옥호%온서현%축례화%M.Koizumi%M.Oshima%Y.Toh%A.Osa%T.Shizuma%T.Hayakawa%M.Sugawara%H.Kusakari%T.Morikawa
在束γ谱学%176Ir的转动带%旋称反转
在束γ譜學%176Ir的轉動帶%鏇稱反轉
재속γ보학%176Ir적전동대%선칭반전
in-beam γ-spectroscopy%rotational bands in 176Ir%signature inversion
利用149Sm(31P,4nγ)反应,通过γ射线的激发函数测量、X-γ和γ-γ符合测量研究了双奇核176Ir的高自旋态. 首次建立了双奇核176Ir由4个转动带构成的能级纲图. 依据从实验数据中提取出的带内B(M1)/B(E2)值与理论计算值的比较,以及相邻双奇核的带结构特征,给出了转动带的准粒子组态. 基于本实验建立起的带间跃迁和在I=18处观测到的旋称交叉,指出176Ir核基于πh9/2νi13/2和πi13/2νi13/2组态的两个转动带在低自旋时出现旋称反转现象.
利用149Sm(31P,4nγ)反應,通過γ射線的激髮函數測量、X-γ和γ-γ符閤測量研究瞭雙奇覈176Ir的高自鏇態. 首次建立瞭雙奇覈176Ir由4箇轉動帶構成的能級綱圖. 依據從實驗數據中提取齣的帶內B(M1)/B(E2)值與理論計算值的比較,以及相鄰雙奇覈的帶結構特徵,給齣瞭轉動帶的準粒子組態. 基于本實驗建立起的帶間躍遷和在I=18處觀測到的鏇稱交扠,指齣176Ir覈基于πh9/2νi13/2和πi13/2νi13/2組態的兩箇轉動帶在低自鏇時齣現鏇稱反轉現象.
이용149Sm(31P,4nγ)반응,통과γ사선적격발함수측량、X-γ화γ-γ부합측량연구료쌍기핵176Ir적고자선태. 수차건립료쌍기핵176Ir유4개전동대구성적능급강도. 의거종실험수거중제취출적대내B(M1)/B(E2)치여이론계산치적비교,이급상린쌍기핵적대결구특정,급출료전동대적준입자조태. 기우본실험건립기적대간약천화재I=18처관측도적선칭교차,지출176Ir핵기우πh9/2νi13/2화πi13/2νi13/2조태적량개전동대재저자선시출현선칭반전현상.
High-spin states in 176Ir have been investigated via the 149Sm(31P,4nγ)176Ir reaction through excitation functions, X-γ and γ-γ coincidence measurements. Four rotational bands have been identified for the first time and their configurations are suggested on the basis of the existing knowledge of band structures in odd-odd nuclei as well as the measured in-band B(M1)/B(E2) ratios. Among the four bands observed,the πh9/2νi13/2 and πi13/2νi13/2 bands exhibit an anomalous signature splitting. The signature inversion point is observed in the former at Ic=18 which is consistent with expectations;this signature inversion spin in the πi13/2νi13/2 band may be larger than 25.
