^(23)Al 的β^+延发质子测量  

Measurement of β^+ Delay Proton Decay of ^(23)Al

作　　者：王宏伟[1] 靳根明[1] 吴和宇[1] 张保国[1] 肖志刚[1] 段利敏[1] 魏志勇[1] 李祖玉[1] 卢朝晖[1] 柳永英[1] 陈克良[1] 胡荣江[1] 朱海东[1] 岑玲[1] 王素芳[1] 李湘庆[2] 陈陶[2] 华辉[2] 

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]北京大学技术物理系,北京100871

出　　处：《高能物理与核物理》2001年第10期971-976,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(1957505);"百人计划"基金;中国科学院"九五"基础性研究重大科学基金(KJ95T-03);国家

摘　　要：利用ＴＯＦ－ Ｅ和０°注入探测器的方法，鉴别并测量了２３Ａｌβ＋延发质子衰变能谱，通过精密脉冲发生器和计数器测得２３Ａｌ的半衰期 Ｔ１／２＝（４７６±４５）ｍｓ．实验中重现了能量为０．２１６，０．２７８，０．４３８，０．４７９ＭｅＶ的低能衰变质子．另外，还观察到了一个新的β＋延发衰变能级 Ｅｘ＝ ８．９１６ＭｅＶ，并给出了它们的相对强度．The β+ delay proton decay spectrum has been measured with TOF- E method and zero degree detectors at the radioactive ion beam line in Lanzhou. The half life of 23 Al was determined to be T1/2 = (476 ± 45)ms by using a time scaler cornbined with the precision pulse generator, which is consistent with the other group's result of (470 ±30)ms. The known ±+ delay protons at Ed = 0. 216, 0. 278 , 0. 438, 0. 479MeV have been observed in the experiment. A new energy level of23Mg at Ex = 8 .916MeV was found in the β+ delay proton decay of 23 Al, and their relative intensity was also determined.

关 键 词：次级束流 β^+延发质子衰变 激发能级 半衰期 ^23Al 铝23 探测技术 

分 类 号：O571[理学—粒子物理与原子核物理]