通过410兆电子伏特的208Pb(3He,t p)反应研究同位旋巨单极共振的激发与衰变

Excitation and decay of the isovector giant monopole resonances via the 208Pb(3He,t p) reaction at 410 MeV.

作者信息

Zegers R G T, Abend H, Akimune H, van den Berg A M, Fujimura H, Fujita H, Fujita Y, Fujiwara M, Galès S, Hara K, Harakeh M N, Ishikawa T, Kawabata T, Kawase K, Mibe T, Nakanishi K, Nakayama S, Toyokawa H, Uchida M, Yamagata T, Yamasaki K, Yosoi M

机构信息

Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.

出版信息

Phys Rev Lett. 2003 May 23;90(20):202501. doi: 10.1103/PhysRevLett.90.202501. Epub 2003 May 20.

DOI:10.1103/PhysRevLett.90.202501

PMID:12785887

Abstract

The excitation and subsequent proton decay of the isovector spin-flip giant monopole resonance (IVSGMR) is studied via the 208Pb(3He,t) reaction at 410 MeV. In the inclusive spectrum (60+/-5)% of the non-energy-weighted sum-rule strength for this 2 variant Planck's over 2h omega resonance was found in the region 29<Ex(208Bi)<51 MeV. The central excitation energy and width of the IVSGMR are 37+/-1 MeV and 14+/-3 MeV, respectively. It is found that the branching ratio for proton decay is (52+/-12)% and that the deep neutron-hole states in 207Pb are strongly fed.

摘要

通过410兆电子伏特的208Pb(3He,t)反应研究了同位旋矢量自旋翻转巨单极共振（IVSGMR）的激发及随后的质子衰变。在包含谱中，在29＜Ex(208Bi)＜51兆电子伏特的区域发现了该2变体普朗克常量除以2hω共振的非能量加权求和规则强度的(60±5)%。IVSGMR的中心激发能和宽度分别为37±1兆电子伏特和14±3兆电子伏特。发现质子衰变的分支比为(52±12)%，并且207Pb中的深中子空穴态被强烈填充。