Observation of the spin isovector monopole resonance using the Pb((p)over-right-arrow,(n)over-right-arrow) Bi reaction at 795 MeV

被引：30
|
作者：
Prout, DL
Rapaport, J
Sugarbaker, E
Cooper, D
Delucia, S
Luther, B
Goodman, CD
Park, BK
Rybarcyk, L
Taddeucci, TN
Ullmann, J
机构：
[1] Ohio State Univ, Columbus, OH 43210 USA
[2] Ohio Univ, Athens, OH 45701 USA
[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[4] New Mexico State Univ, Las Cruces, NM 88003 USA
[5] Indiana Univ, Cyclotron Facil, Bloomington, IN 47405 USA
来源：
PHYSICAL REVIEW C | 2001年 / 63卷 / 01期
关键词：
D O I：
10.1103/PhysRevC.63.014603
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
We examine a broad resonance in the 0 degrees Pb-208(p,n)Bi-208 and Zr-90(p,n)Nb-90 cross section spectra obtained at 795 MeV incident energy that appears at 32 MeV excitation energy in Bi-208 and Nb-90. Earlier data taken at 200 MeV incident energy using the same reactions show no evidence for this resonance. We present theoretical results indicating that the spin isovector monopole predicted at this excitation energy is barely excited at 200 MeV while it is strongly excited at the higher energy. To further investigate this structure we have measured the first complete set of polarization-transfer observables for Pb-nat at 0 degrees using the ((p) over right arrow,(n) over right arrow) reaction at 795 MeV. The data show this resonance is predominantly a spin flip DeltaS = 1 excitation giving strong supporting evidence for assigning this resonance as the spin isovector monopole.
引用
收藏
页码：146031 / 146039
页数：9
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