/*===================================================================*/ /* NRDF D1779 Data No.1 */ /*===================================================================*/ /* Bibliography */ /*===================================================================*/ \\BIB,1; D#=D1779; TITLE=/Experimental evidence of core modification in the near drip-line nucleus 23O/; PURPOSE=/IRecent studies of N=15,N,O,F isotopes shows an abrupt rise in interaction cross section.In this letter, we investigate the cause for this through the simultanious longitudinal momentum distribution measurements of one- and two-neutron removal fragments of 23O with a new direct TOF technique./; ATH=(R.KANUNGO'1', M.CHIBA'1', N.IWASA'2', S.NISHIMURA'1', A.OZAWA'1', C.SAMANTA'3,4', T.SUDA'1', T.SUZUKI'5', T.YAMAGUCHI'1', T.ZHENG'1', I.TANIHATA'1'); INST-ATH=(2JPNIPC'1', 2JPNTOH'2', 1USAUSA'3', 3INDSAH'4', 2JPNNII'5'); /* '2' Department of Physics */ /* '3' Physics Department, Virginia Commonwealth University, West Main Street, Richmond, Virginia */ /* '5' Department of Physics */ REF=PRL; VLP=88(2002)142502; RCTS=(C(23O,22O)X, C(23O,21O)X); PHQS=(MOM-DSTRN'6', XSECTN, WDTH'7'); /* '6' longitudinal momentum distribution in projectile rest frame. /* '7' FWHM (Full Width at Half Maximum) */ /*===================================================================*/ /* Experimental Conditions */ /*===================================================================*/ \\EXP,1; /* 2003-03-11 : Compiled */ ENR=NAT; CHM=ELM; PHYS-FORM=SLD; THK-TGT=370MG/CM**2; BAC=X; POL-TGT=0%; ALGN-TGT=0%; ACC=PRJFS'8'; /* '8' The secondary beam of 23O was produced by fragmentation of the 40Ar primary beam on a Be target at 92A MeV. */ INST-ACC=2JPNIPC; INC-ENGY-LAB=72MEV/A; BEAM-INTNSTY=XMA'9'; /* '9' 5-10 pps */ POL-PRJ=0%; COINC=NO; ANT-COINC=NO; DET-SYS=(MAG+TOF'10',SI'11',NAI'12',SSD'13'); /* '10' The momentums of 23O and breakup fragments were determined by TOF. The angular acceptance of the magnet is 99% (nearly full angular acceptance). */ /* '11' The pulse height information was obtained by NaI and silicon detectors. */ /* '12' the pulse height information was obtained by NaI and silicon detectors. */ /* '13' The use of SSD helped in removing the reaction background both in SSD as well as in the NaI. */ ERS-DET=20MEV/C'14'; /* '14' sigma value */ ANL=GLAUBER'15'; /* '15' The theoretical curves are few-body Glauber model calculations by Y.Ogawa et.al, Nucl. Phys. A571, 784 (1994). /* 2004-03-31 : Altered, Data are replaced by data sent from author. */ RCT=C(23O,22O)X; PHQ=MOM-DSTRN'16'; /* '16' longitudinal momentum distribution in projectile rest frame. */ DET-PARTCL=22O; /*===================================================================*/ /* Descriptive Parameters */ /*===================================================================*/ \\DATA,1; INC-ENGY-LAB=72MEV/A; EMT=22O; /*===================================================================*/ /* Data Table */ /*===================================================================*/ \DATA; MOM-LNGTD'17' COUNTS'18' DELTA-COUNTS'18,19' (MEV/C) (ARB) (ARB) -286 5 +-2.2360679774998 -253 12 +-3.4641016151378 -220 19 +-4.3588989435407 -187 18 +-4.2426406871193 -154 24 +-4.8989794855664 -121 46 +-6.7823299831253 -88 92 +-9.5916630466254 -55 151.66 +-12.4526919758009 -22 220.20 +-20.168843961722 11 128.88 +-23.548898114746 44 64.09 +-11.9383418033554 77 39.14 +-6.405730402308 110 34 +-5.8309518948453 143 19 +-4.3588989435407 176 9 +-3 209 3 +-1.7320508075689 \END; /*===================================================================*/ |