氧同位素上的准自由（p，2p）反应：约化单粒子强度同位旋独立性的观测

Quasifree (p, 2p) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength.

作者信息

Atar L, Paschalis S, Barbieri C, Bertulani C A, Díaz Fernández P, Holl M, Najafi M A, Panin V, Alvarez-Pol H, Aumann T, Avdeichikov V, Beceiro-Novo S, Bemmerer D, Benlliure J, Boillos J M, Boretzky K, Borge M J G, Caamaño M, Caesar C, Casarejos E, Catford W, Cederkall J, Chartier M, Chulkov L, Cortina-Gil D, Cravo E, Crespo R, Dillmann I, Elekes Z, Enders J, Ershova O, Estrade A, Farinon F, Fraile L M, Freer M, Galaviz Redondo D, Geissel H, Gernhäuser R, Golubev P, Göbel K, Hagdahl J, Heftrich T, Heil M, Heine M, Heinz A, Henriques A, Hufnagel A, Ignatov A, Johansson H T, Jonson B, Kahlbow J, Kalantar-Nayestanaki N, Kanungo R, Kelic-Heil A, Knyazev A, Kröll T, Kurz N, Labiche M, Langer C, Le Bleis T, Lemmon R, Lindberg S, Machado J, Marganiec-Gałązka J, Movsesyan A, Nacher E, Nikolskii E Y, Nilsson T, Nociforo C, Perea A, Petri M, Pietri S, Plag R, Reifarth R, Ribeiro G, Rigollet C, Rossi D M, Röder M, Savran D, Scheit H, Simon H, Sorlin O, Syndikus I, Taylor J T, Tengblad O, Thies R, Togano Y, Vandebrouck M, Velho P, Volkov V, Wagner A, Wamers F, Weick H, Wheldon C, Wilson G L, Winfield J S, Woods P, Yakorev D, Zhukov M, Zilges A, Zuber K

机构信息

Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany.

GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.

出版信息

Phys Rev Lett. 2018 Feb 2;120(5):052501. doi: 10.1103/PhysRevLett.120.052501.

DOI:10.1103/PhysRevLett.120.052501

PMID:29481189

Abstract

Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure of stable and exotic oxygen isotopes at the R^{3}B/LAND setup with incident beam energies in the range of 300-450 MeV/u. The oxygen isotopic chain offers a large variation of separation energies that allows for a quantitative understanding of single-particle strength with changing isospin asymmetry. Quasifree knockout reactions provide a complementary approach to intermediate-energy one-nucleon removal reactions. Inclusive cross sections for quasifree knockout reactions of the type ^{A}O(p,2p)^{A-1}N have been determined and compared to calculations based on the eikonal reaction theory. The reduction factors for the single-particle strength with respect to the independent-particle model were obtained and compared to state-of-the-art ab initio predictions. The results do not show any significant dependence on proton-neutron asymmetry.

摘要

在逆运动学中，利用类自由单质子敲出反应，在R³B/LAND装置上，以300 - 450 MeV/u的入射束能量，对稳定和奇异氧同位素的结构进行了系统研究。氧同位素链的分离能变化很大，这使得我们能够定量理解随着同位旋不对称性变化的单粒子强度。类自由敲出反应为中能单核子移除反应提供了一种补充方法。已经确定了类型为(^{A}O(p,2p)^{A - 1}N)的类自由敲出反应的包含截面，并与基于程函反应理论的计算结果进行了比较。获得了相对于独立粒子模型的单粒子强度约化因子，并与最新的从头算预测结果进行了比较。结果并未显示出对质子 - 中子不对称性有任何显著依赖性。