|
| /*===================================================================*/
/* NRDF D0189 Data No.4 */
/*===================================================================*/
/* Bibliography */
/*===================================================================*/
\\BIB,4;
/* 2007-03-05 N.OTUKA: INST-ATH corrected */
D#=D189;
TITLE=/THE J-PI=3- DOUBLET AT EX=6241 KEV IN 18F: ISOSPIN MIXING/;
ATH=(W.E.KIESER'1',R.E.AZUMA'1',I.BERKA'1',K.P.JACKSON'1',
A.B.MCDONALD'2',H.B.MAK'3',W.MCLATCHIE'3');
INST-ATH=(1CANTOR'1',1CANCRC'2',1CANKQU'3');
REF=NP/A;
VLP=327(1979)172;
RCTS=(17O(P,GAMMA)18F,17O(P,ALPHA)14N,14N(ALPHA,GAMMA)18F,
4HE(14N,ALPHA)14N);
/*@33@*/
/*===================================================================*/
/* Experimental Conditions */
/*===================================================================*/
\\EXP,4;
ENR=98%;
THK-TGT=X'2';
BAC=W'2';
THK-BAC=2.3UG/CM**2;
/*@2@*/
/*@3@*/
ACC=(VDG);
INST-ACC=1CANTOR;
INC-ENGY-RANGE=[0.666MEV[0.675MEV;
DELTA-INC-ENGY=[1.2KEV;
BEAM-INTNSTY=[50UA;
DET-PARTCL=(GAMMA,ALPHA);
DET-SYS=(MAG+PS-SI'5',SI'5',X'3');
ERS-DET=1.2KEV;
/*@3@*/
/*@5@*/
ANL=(RMTRX-THEORY);
PHQ=(EXC-FUNCT,ANGL-DSTRN'3',EXC-ENGY,RESN-ENGY,TOT-WDTH,PART-WDTH,WDTH
-RATIO,SPIN,PTY,TRANSN-STRGTH'3',YLD'3',BRANCH'3');
/*@3@*/
RCT=17O(P,ALPHA)14N;
/*===================================================================*/
/* Descriptive Parameters */
/*===================================================================*/
\\DATA,4;
CMPD=18F;
RSD=14N;
EXC-ENGY=XMEV;
THE 14N(ALPHA,ALPHA)14N SCATTERING MEASUREMENTS.
@@15; 'P'
PARTIAL WIDTHS FOR PROTON DECAY
@@16; 'A'
PARTIAL WIDTHS FOR ALPHA DECAY
@@17; 'G'
PARTIAL WIDTHS FOR GAMMA DECAY
@@21; '21'
DATA FROM (P,GAMMA),(P,ALPHA),(ALPHA,GAMMA) MEASUREMENTS
@@22; '22'
DATA FROM HIGH RESOLUTION (ALPHA,ALPHA) MEASUREMENTS
@@23; '23'
DATA FROM LOW RESOLUTION (ALPHA,ALPHA) MEASUREMENTS
@@24; '24'
DATA FROM AVERAGE OF (ALPHA,ALPHA) MEASUREMENTS
@@18; '18'
THE DIFFERENTIALLY PUMPED GAS TARGET AT CRNL. SEE A.B.MCDONALD ET AL.
NUCL. PHYS. A287(1977)189.
@@19; '19'
MONITOR: IN ORDER TO MONITOR THE INCOMING BEAM CURRENTS AND TO TAKE I
NTO ACCOUNT ANY FLUCTUATIONS IN TARGET PRESSURE, KRYPTON GAS WAS ADDE
D(2 % BY VOLUME) TO THE 4HE TARGET GAS. THE ELASTIC SCATTERING OF THE
14N BEAM BY THE KRYPTON, OBSERVED IN THE THETA(LAB)=35 DEG. DETECTOR
,WAS USED AS A MONITOR
@@25;
'25' GAUSSIAN WIDTH (DELTA)
@@26;
'26' LANDAU PARAMETER (ZETA)
@@20;
'20' LOW RESOLUTION DATA
@@27;
'27' HIGH RESOLUTION DATA
@@28; '28'
CONVERTED TO EQUIVALENT ALPHA INCIDENT ENERGIES FOR THE REACTION, 14N
(ALPHA,ALPHA)14N, TO FACILITATE COMPARISON WITH PREVIOUS DATA.
@@29;
'29' TOTAL STRENGTH OF GAMMA TRANSITION
@@30;
'30' ISOSPIN MIXING PARAMETER FOR THE DOUBLET OF J-PI=3- WITH T=1 OR 0.
@@31;
'31' ERROR ARISES PREDOMINANTLY FROM UNCERTAIN E2 CONTRIBUTION.
@@32;
'32' TABLE 4: ISOVECTOR TRANSION STRENGTHS AND THE DEGREE OF ISOSPIN
MIXING DERIVED FROM THE DECAYS OF THE J-PI=3- DOUBLET AT 6240 AND 624
2 KEV.
@@33;
'33' CONCLUSION; REEXAMINATION OF THE EXCITATION FUNCTIONS FOR REACTI
ONS 17O(P,GAMMA)18F AND 17O(P,ALPHA)14N, USING THIN TARGETS REVEALED
THE EXISTENCE OF TWO CLOSELY SPACED RESONANCES SEPARATED BY DELTA-EXC
=2.09+-0.04 KEV. THE SIMILAR BRANCHING RATIOS OBSERVED FOR THE GAMMA-
RAY DECAYS OF THE TWO RESONANCES SUGGESTED THE POSSIBILITY THAT THESE
WERE THE TWO MEMBERS OF THE ISOSPIN-MIXED J-PI=3- DOUBLET. THIS WAS
CONFIRMED BY FURTHER EXPERIMENTS UTILIZING THE 14N(ALPHA,GAMMA)18F AN
D 4HE(14N,ALPHA)14N REACTIONS. THIS DOUBLET CAN BE DESCRIBED WITH THE
COMPLELE MIXING OF T=0 AND T=1 STATES.
/*===================================================================*/
/* Data Table */
/*===================================================================*/
\DATA;
DATA2'2,L' DATA-ERR DATA2'2,U' DATA2-ERR
(EV) (EV) (EV) (EV)
358 +-42 237 +-28
\END;
/*===================================================================*/
|