Crespi F C L, Bracco A, Nicolini R, Mengoni D, Pellegri L, Lanza E G, Leoni S, Maj A, Kmiecik M, Avigo R, Benzoni G, Blasi N, Boiano C, Bottoni S, Brambilla S, Camera F, Ceruti S, Giaz A, Million B, Morales A I, Vandone V, Wieland O, Bednarczyk P, Ciemała M, Grebosz J, Krzysiek M, Mazurek K, Zieblinski M, Bazzacco D, Bellato M, Birkenbach B, Bortolato D, Calore E, Cederwall B, Charles L, de Angelis G, Désesquelles P, Eberth J, Farnea E, Gadea A, Görgen A, Gottardo A, Isocrate R, Jolie J, Jungclaus A, Karkour N, Korten W, Menegazzo R, Michelagnoli C, Molini P, Napoli D R, Pullia A, Recchia F, Reiter P, Rosso D, Sahin E, Salsac M D, Siebeck B, Siem S, Simpson J, Söderström P-A, Stezowski O, Theisen Ch, Ur C, Valiente-Dobón J J
Dipartimento di Fisica dell'Università degli Studi di Milano, I-20133 Milano, Italy and INFN, Sezione di Milano, I-20133 Milano, Italy.
Dipartimento di Fisica dell'Università degli Studi di Padova, I-35131 Padova, Italy and INFN, Sezione di Padova, I-35131 Padova, Italy.
Phys Rev Lett. 2014 Jul 4;113(1):012501. doi: 10.1103/PhysRevLett.113.012501. Epub 2014 Jul 2.
The properties of pygmy dipole states in 208Pb were investigated using the 208Pb(17O, 17O'γ) reaction at 340 MeV and measuring the γ decay with high resolution with the AGATA demonstrator array. Cross sections and angular distributions of the emitted γ rays and of the scattered particles were measured. The results are compared with (γ, γ') and (p, p') data. The data analysis with the distorted wave Born approximation approach gives a good description of the elastic scattering and of the inelastic excitation of the 2+ and 3- states. For the dipole transitions a form factor obtained by folding a microscopically calculated transition density was used for the first time. This has allowed us to extract the isoscalar component of the 1- excited states from 4 to 8 MeV.
利用340 MeV的208Pb(17O, 17O'γ)反应，并使用AGATA演示器阵列以高分辨率测量γ衰变，研究了208Pb中矮偶极态的性质。测量了发射γ射线和散射粒子的截面及角分布。将结果与(γ, γ')和(p, p')数据进行了比较。采用扭曲波玻恩近似方法进行的数据分析很好地描述了2+和3-态的弹性散射和非弹性激发。对于偶极跃迁，首次使用了通过折叠微观计算的跃迁密度得到的形状因子。这使我们能够提取4至8 MeV的1-激发态的同位旋标量分量。
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