Momentum dependence of spin polarization for beta emitting nuclei produced through charge exchange reaction at intermedi
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Momentum dependence of spin polarization for beta emitting nuclei produced through charge exchange reaction at intermediate energy S. Momota · M. Mihara · D. Nishimura · M. Fukuda · Y. Kamisho · M. Wakabayashi · K. Matsuta · S. Suzuki · M. Nagashima · Shengyun Zhu · Daqing Yuan · Yongnan Zheng · Zuo Yi · Ping Fan · T. Izumikawa · A. Kitagawa · S. Sato · M. Kanazawa · M. Torikoshi · T. Minamisono · Y. Nakamura · K. Tashiro · A. Honma · N. Yoshida · H. Shirai · T. Ohtsubo · T. Nagatomo · H. Uenishi · K. Iwamoto · M. Yaguchi · T. Ogura · T. Ito · K. Yamamura · Y. Ichikawa · Y. Nojiri · J. R. Alonso · T. J. M. Symons Published online: 19 December 2012 © Springer Science+Business Media Dordrecht 2012
S. Momota (B) · Y. Nojiri Kochi University of Tech., Kochi 782-8502, Japan e-mail: [email protected] M. Mihara · M. Fukuda · Y. Kamisho · M. Wakabayashi · K. Matsuta · T. Minamisono · H. Uenishi · K. Iwamoto · M. Yaguchi Osaka University, Osaka 560-0043, Japan D. Nishimura RIKEN, Saitama 351-0198, Japan S. Suzuki · M. Nagashima · Y. Nakamura · K. Tashiro · A. Honma · T. Ohtsubo · T. Ogura · T. Ito Niigata University, Niigata 951-2181, Japan S. Zhu · D. Yuan · Y. Zheng · Z. Yi · P. Fan CIAE, Beijing 102413, People’s Republic of China T. Izumikawa RI Center, Niigata University, Niigata 951-8510, Japan A. Kitagawa · S. Sato · M. Kanazawa · M. Torikoshi NIRS, Inage, Chiba 263-8555, Japan N. Yoshida · H. Shirai · Y. Ichikawa TIT, 2-12-1, Tokyo 152-8551, Japan T. Nagatomo J-PARC, Ibaraki 319-1195, Japan K. Yamamura Fukui University of Tech., Fukui 910-8505, Japan J. R. Alonso · T. J. M. Symons LBL, Berkeley, CA 94720, USA
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Abstract In order to investigate the polarization process in charge exchange reactions, we observed the momentum and angular distribution as well as the nuclear polarization of a proton-rich beta-emitting nucleus, 28 P (I π = 3+ , T1/2 = 270 msec), produced through the reaction 28 Si+9 Be at E = 100 MeV/u, by selecting the momentum and the ejection angle. An analysis by using double Gaussian functions resolved the observed momentum distribution into two reaction components, nucleon knockout and pick-up abrasion reactions, as suggested in a previous study. The behavior of the observed angular distribution and nuclear polarization implies the influence of those two components. The momentum dependence of the observed nuclear polarization of 28 P could be consistently reproduced by a simple model, in which two reaction components are considered. The present study also shows that the charge exchange reaction at intermediate energy is a useful method to produce polarized beta-emitting nuclei, especially for proton-rich nuclei. Keywords Production of nuclear polarization · Beta emitting nuclei · Nuclear moments
1 Introduction A spin polarized beta-emitting nucleus is one of the useful probes to investigate nuclear structures by means of nuclear moments and weak interactions. By using nuclear polarization and precisely determined nuclear moments of beta-emitting nuclei, hyperfine inte
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