¾¼Ï£¶£³Ç¯ÅÙ¶¦Æ±ÍøÍÑ·×»»Èñ»ÈÍÑÊó¹ð½ñ ¸¦µæ¥Æ¡¼¥Þ¡¡¡¡´ñ£Ú³Ë²óžÂӤǤÎÃæÀ»ÒÂФβóžÀ°Îó¤Î¸ú²Ì »ÈÍÑÀÕǤ¼Ô¡¡¡¡ÅÄÅ衡ľ¼ù¡¡¡Ê¡¡ÅìÂç¡¡¶µÍÜ¡¡¡Ë ¶¦Æ±¸¦µæ¼Ô¡¡¡¡ÂçÀ¾¡¡Ä¾µ£ £á¡Ëabstract The effects of the rotation-alignment of a pair of neutrons on the signature splitting of the energy levels in 157Ho are investigated in the framework of a proton-neutron-triaxial-rotor model. We included many-quasi-particle configurations and highly-excited ¦Ã- bands in our model space. We confirmed that the employed model space is large enough that the calculated signs of the signature splittings are reliable. Some earlier results obtained by other authors are verified in our larger- model-space calculations. It is shown that the effects of the coupling with highly excited ¦Ã-bands (K ¡æ4) are not negligible. When we include only the lowest (K=2) ¦Ã-band and assume the reversed (compared to the irrotational flow model) ¦Ã-dependence of the moment of inertia, the signature dependence is inverted in the spin region just after the first backbending. But when we include higher-lying ¦Ã-bands, we find that the normal signature splitting is recovered for all spin values. £â¡Ë·×»»¤Ë¤è¤êÆÀ¤é¤ì¤¿·ë²Ì¤ÈʪÍýŪÆâÍƤÎÀâÌÀ ¡ø£±¡¥½ø ¡¡ºÇ¶á¡¢£È£ï¡¢£Ô£í¤Ê¤É¤Î´ñÍÛ»Ò¿ô¤Î³Ë¤Î²óžÂӤΥ¨¥Í¥ë¥®¡¼½à°Ì¤¬¡¢Âè°ì¸å ÊýÏĶʤò¤Ï¤ë¤«¤ËĶ¤¨¤ë¥¹¥Ô¥ó¤Þ¤Ç´Ñ¬¤µ¤ì¤ë¤è¤¦¤Ë¤Ê¤Ã¤Æ¤¤¿¤¬¡¢¤½¤Î»Øɸ ¡Êsignature ¡Ë°Í¸À¤¬Âè°ì¸åÊýÏĶʸ塢¤Û¤È¤ó¤É¾ÃÌǤ·¡¢¤à¤·¤í¤ï¤º¤«¤ËµÕ ž¤·¤Æ¤¤¤ëÎã¡Ê»ØɸµÕž¸½¾Ý¡Ë¤¬¡¢157£È£ï¤ò¤Ï¤¸¤á[1]¡¢¤¤¤¯¤Ä¤«¤Î³Ë¤Ëȯ¸« ¤µ¤ì¤¿¡£¤³¤ì¤é¤Î¥Ð¥ó¥É¤Ç¤Ï¡¢ÂФòÁȤޤʤ¤ºÇ¸å¤Î£±ÍÛ»Ò¤¬ intruder µ°Æ»¡¡ h11/2 ¤ËÆþ¤Ã¤Æ¤¤¤ë¡£³ËÁ´ÂΤγѱ¿Æ°Î̤ò I ¤È¤·¡¢ j=11/2 ¤È¤¹¤ë¤È¡¢I-j ¤Î¶ö´ñÀ¤¬»Øɸ¤È£±ÂУ±¤ËÂбþ¤¹¤ë¡£I-j ¤¬¶ö¿ô¤Î¥Ð¥ó¥É¤ò f-¥Ð¥ó¥É¡¢´ñ¿ô ¤Î¥Ð¥ó¥É¤ò u-¥Ð¥ó¥É¤È¤¤¤¤¡¢Ä̾ï¤Ï¡¢Á°¼Ô¤Î¤Û¤¦¤¬¸å¼Ô¤è¤ê¥¨¥Í¥ë¥®¡¼¤¬Äã ¤¤¡£¤³¤Î¤è¤¦¤Ê¥¨¥Í¥ë¥®¡¼½à°Ì¤Î»ØɸµÕž¸½¾Ý¤Ï¡¢³Ë¤¬²óž¼´Êý¸þ¤Ë²¡¤·¤Ä¤Ö ¤µ¤ì¤ë¤è¤¦¤Ê¡Èpositive-¦Ã¡ÉÊÑ·Á¡ÊLund ɽµ ¤Ë¤è¤ë¡Ë¤Î¤â¤È¤Çµ¯¤³¤ë¤Èͽ ÁÛ¤µ¤ì¤Æ¤¤¤ë[2,3,4]¡£²óžÀ°Îó¤·¤¿ÃæÀ»ÒÂФϡ¢¤³¤Î¤è¤¦¤Ê·Á¤Ë¿Ä¤òÊжˤµ ¤»¤ë¸ú²Ì¤ò»ý¤Ä¡£¤·¤«¤·¡¢¡Èpositive-¦Ã¡ÉÊÑ·Á¤Ç¤Ï¼´ÂоÎÊÑ·Á¤Î¤È¤¤è¤ê³Ë 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EMTRNS¡§PRTROT ¤Çµá¤á¤¿¡Ö¿Ä¡ßγ»Ò·Ï¡×¤Î¸Ç;õÂ֤ȡ¢TRIAX ¤ä CORSTT ¤Çµá¤á ¡¡¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡ ¡û ¤¿¿Ä¤Î E2 Á«°Ü¿¶Éý¡¢PNSYS1 ¤Ç»»½Ð¤µ¤ì¤¿Î³»Ò·Ï¤Î E2¡¢M1 Á«°Ü¿¶Éý¤ò»È¤Ã¤Æ¡¢¡Ö¿Ä¡ßγ»Ò·Ï¡×¤Î¸Ç;õÂִ֤ΠE2¡¢M1 Á«°Ü¿¶Éý¤òµá¤á¤ë¡£ ¡û MAINWF¡§¡Ö¿Ä¡ßγ»Ò·Ï¡×¤Î¸Ç;õÂÖ¤ÎÀ¼Á¡Ê½ôÎ̻ҿô¤ÎʬÉÛ¤ä´üÂÔÃ͡ˤò¡¢¡Ö¿Ä ¡û ¤Î¥Õ¥¡¥¤¥ë¡×¤ä¡Öγ»Ò·Ï¤Î¥Õ¥¡¥¤¥ë¡×¤ò»²¾È¤·¤Ä¤Ä¡¢µá¤á¤ë¡£ ¥Ö¥í¥Ã¥¯¡¦¥À¥¤¥¢¥°¥é¥à ¡Ú°ìÂÀϺ¥Õ¥¡¥¤¥ë¤Î·ÓÀþÉôʬ¤¬¾Ã¼º¤·¤Æ¤·¤Þ¤Ã¤¿¡Û ¡¡¦Íi13/2·Ï Davydov model Bohr model ¦Ðh11/2·Ï ¬°¬¤¬¤¬¤¬´ ¬°¬¤¬¤¬¤¬´ ¬°¬¤¬¤¬¤¬¤¬´ ¬°¬¤¬¤¬¤¬¤¬´ ¬¦SJFILE¬¦ ¬¦TRIAX ¬¦ ¬¦ RDYBR ¬¦ ¬¦ SJFILE ¬¦ ¬¸¬¤¬Ð¬¤¬¼ ¬¸¬¤¬Ð¬¤¬¼ ¬¸¬¤¬Ð¬¤¬¤¬¼ ¬¸¬¤¬Ð¬¤¬¤¬¼ ¬°¬¤¬Ø¬¤¬´ ¬¦ ¬°¬¤¬Ø¬¤¬¤¬´ ¬°¬¤¬Ø¬¤¬¤¬´ ¬¦PNSYS1¬¦ ¬¦ ¬¦ CORSTT ¬¦ ¬¦ PNSYS1 ¬¦ ¬¸¬¤¬Ð¬¤¬¼ ¬¦ ¬¸¬¤¬Ð¬¤¬¤¬¼ ¬¸¬¤¬Ð¬¤¬¤¬¼ ¬¦ ¬°¬¤¬¤¬¤¬´ ¬¦ ¬¦ ¬¦ ¬¸¬¤¬ÈPRTROT¬À¬¤¬Ø¬¤¬¤¬¤¬¤¬¤¬¤¬¤¬¼ ¬¦ ¬°¬¤¬¤¬¤¬´¬¸¬Ð¬Ð¬¤¬¼ ¬¦ ¬¦MAINWF¬À¬¤¬¼¬¦ ¬¦ ¬¸¬¤¬¤¬¤¬¼¬°¬¤¬Ø¬¤¬´ ¬¦ ¬¦EMTRNS¬¦ ¬¦ ¬¸¬¤¬Ð¬¤¬¼ ¬°¬¤¬¤¬¤¬´ ¬¦ ¬¸¬¤¬¤¬¤¬¤¬¤¬¤¬ÈPRTROT¬À¬¤¬¤¬¤¬¤¬¤¬¤¬¤¬¼ ¬°¬¤¬¤¬¤¬´¬¸¬Ð¬Ð¬¤¬¼ ¬¦MAINWF¬À¬¤¬¼¬¦ ¬¸¬¤¬¤¬¤¬¼¬°¬¤¬Ø¬¤¬´ ¬¦EMTRNS¬¦ ¬¸¬¤¬¤¬¤¬¼ »²¹Íʸ¸¥ 1) G.B. Hagemann, et al., Nucl. Phys. A424 (1984) 365. 2) S. Frauendorf and F.R. May, Phys. Lett. B125 (1983) 245. 3) R. Bengtsson, et al., Nucl. Phys. A415 (1984) 189. 4) N. Onishi and N. Tajima, Prog. Theor. Phys. 80 (1988) 130. 5) I. Hamamoto, Phys. Lett. B179 (1986) 327. 6) A. Ikeda and T. Shimano, preprint; A. Ikeda and S. Aberg, Nucl. Phys. A480 (1988) 85. 7) N. Tajima and N. Onishi, Phys. Lett. B179 (1986) 187. 8) N. Tajima and N. Onishi, Nucl. Phys. A491 (1989) 179. 9) N. Onishi and J.W. Negele, Nucl. Phys. A301 (1978) 336. 10) N. Tajima and N. Onishi, Genshikaku Kenkyu 33 (1989) no.6 p.51. 11) N. Tajima, Ph. D. Thesis, Univ. of Tokyo (1989). 12) R.R. Whitehead, et al., in Adv.in Nucl.Phys. 9(Plenum,N.Y.,1977).