中能重离子与~（nat）W相互作用中Hf的同位素分布

Abstract

用放射化学方法测量了４０ＭｅＶ／ｕ￣（４０）Ａｒ、１０．５ＭｅＶ／ｕ￣（８４）Ｋｒ、８０ＭｅＶ／ｕ￣（１６）Ｏ、１３５ＭｅＶ／ｕ￣（１２）Ｃ＋￣（ｎａｔ）Ｗ反应中Ｈｆ的生成截面，得到了Ｈｆ的同位素分布。研究结果表明，利用ＨＩＲＦＬ能量的重离子和丰中子重靶作用，能以一定的截面生成Ａ＞１７０区丰中子新核素，Ｎ／Ｚ值高的炮弹有利于丰中子新核素的生成，过高的炮弹能量对丰中子新核素的生成没有贡献。The yields of known Hf isotopes prduced in 40MeV/u￣(40)Ar,10.5MeV/u￣(84)Kr,135MeV/u￣(12) C and 80MeV/u￣(16)O+￣(nat) W reactions are determined by combining chemical separation proce-dure with γ-ray spectroscopic measurement.The isotopic distributions are obtained. The resultsshow that it is possible to use HIRFL energetic heavy ions to synthesize the neutron-rich isotopesin A > 170 region,and the projectiles with high N/Z ratio value seem to be favourable to the dis-covery of new neutron-rich istopes. Ho..