977 MEV和1143 MEV $^{204} $ Hg的多核转移与$^{208} $ pb

论文标题

977 MEV和1143 MEV $^{204} $ Hg的多核转移与$^{208} $ pb

Multi-nucleon transfer in the interaction of 977 MeV and 1143 MeV $^{204}$Hg with $^{208}$Pb

论文作者

Desai, V. V., Pica, A., Loveland, W., Barrett, J. S., Chemistry, Department of, University, Oregon State, Corvallis, USA, Oregon 97331, McCutchan, E. A., Center, National Nuclear Data, Laboratory, Brookhaven National, Upton, 11973, New York, USA, Zhu, S., Carpenter, M. P., Greene, J. P., Lauritsen, T., Division, Physics, Laboratory, Argonne National, Argonne, USA, Illinois 60439, Janssens, R. V. F., Physics, Department of, Astronomy, Hill, University of North Carolina at Chapel, Hill, Chapel, USA, North Carolina 27599, Laboratory, Triangle Universities Nuclear, University, Duke, Durham, USA, North Carolina 27708, Amro, B. M. S., Physics, Dept. of, Lowell, University of Massachusetts, USA, Lowell MA 01854, Walters, W. B., Chemistry, Dept. of, Maryland, University of, Park, College, MD

论文摘要

先前对大核对称碰撞的研究表明，当前多核子转移（MNT）反应的模型不能充分描述转移产物的产量。为了进一步了解此问题，我们在977（E/A = 4.79 MEV）和1143 MEV（E/A = 5.60 MEV）$^{204} $ HG与$^{208} $ pb的相互作用中测量了MNT产品的产量。我们发现，在这两种反应中，多核子转移产物的产量相似，并且大大低于1257 MeV（E/A = 6.16 MEV）$^{204} $ HG + $^{198} $ PT中观察到的产量。我们将测量结果与放牧F，二核系统（DNS）和改进的量子分子动力学（IMQMD）模型的预测进行了比较。对于元素AU，Hg，Tl，Pb和BI的观察到的同位素，MNT横截面的测量值是比预测值大的数量级。此外，各种模型都预测了未观察到n = 126壳附近的核素的形成。

A previous study of symmetric collisions of massive nuclei has shown that current models of multi-nucleon transfer (MNT) reactions do not adequately describe the transfer product yields. To gain further insight into this problem, we have measured the yields of MNT products in the interaction of 977 (E/A = 4.79 MeV) and 1143 MeV (E/A = 5.60 MeV) $^{204}$Hg with $^{208}$Pb. We find that the yield of multi-nucleon transfer products are similar in these two reactions and are substantially lower than those observed in the reaction of 1257 MeV (E/A = 6.16 MeV) $^{204}$Hg + $^{198}$Pt. We compare our measurements with the predictions of the GRAZING-F, di-nuclear systems (DNS) and improved quantum molecular dynamics (ImQMD) models. For the observed isotopes of the elements Au, Hg, Tl, Pb and Bi, the measured values of the MNT cross sections are orders of magnitude larger than the predicted values. Furthermore, the various models predict the formation of nuclides near the N=126 shell, which are not observed.

下载PDF全文

下载文献需遵守相关版权规定

论文标题