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/* NRDF D1779 Data No.2 */
/*===================================================================*/
/* Bibliography */
/*===================================================================*/
\\BIB,2;
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,2;
/* 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,21O)X;
PHQ=MOM-DSTRN'20';
/* '20' longitudinal momentum distribution in projectile rest
frame. */
DET-PARTCL=21O;
/*===================================================================*/
/* Descriptive Parameters */
/*===================================================================*/
\\DATA,2;
INC-ENGY-LAB=72MEV/A;
EMT=21O;
/*===================================================================*/
/* Data Table */
/*===================================================================*/
\DATA;
MOM-LNGTD'21' COUNTS'22' DELTA-COUNTS'22,23'
(MEV/C) (ARB) (ARB)
-199.5 1 +-1
-168 9 +-3
-136.5 13 +-3.605551275464
-105 14 +-3.7416573867739
-73.5 22 +-4.6904157598234
-42 21.91 +-4.6904732760205
-10.5 48.33 +-8.3739157659612
21 53.46 +-13.1784726978256
52.5 14.40 +-7.7621420191862
84 16.89 +-4.360168807794
115.5 15 +-3.8729833462074
147 7 +-2.6457513110646
178.5 8 +-2.8284271247462
210 4 +-2
241.5 0 +-0
\END;
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