/*===================================================================*/ /* NRDF D1797 Data No.6 */ /*===================================================================*/ /* Bibliography */ /*===================================================================*/ \\BIB,6; D#=D1797; TITLE=/Isobaric analog state of 14Be/; PURPOSE=/To measure the Isobaric Analog State (IAS) of the neutron-dripline nucleus 14Be for the first time in a charge-exchange reactino 14Be(p,n)14B* in inverse kinematics at E(14Be) = 74 AMeV./; ATH=(S.TAKEUCHI'1', S.SHIMOURA'2', T.MOTOBAYASHI'1', H.AKIYOSHI'3', Y.ANDO'1', N.AOI'4', ZS.FULOP'5', T.GOMI'1', Y.HIGURASHI'1', M.HIRAI'6', N.IWASA'7', H.IWASAKI'2', Y.IWATA'6', H.KOBAYASHI'1', M.KUROKAWA'2', Z.LIU'8', T.MINEMURA'3', S.OZAWA'3', H.SAKURAI'4', M.SERATA'1', T.TERANISHI'2', K.YAMADA'1', Y.YANAGISAWA'3', M.ISHIHARA'3'); INST-ATH=(2JPNYOK'1', 2JPNTOK'2', 2JPNIPC'3', 2JPNTOK'4', 3HUNDEB'5', 2JPNIRS'6', 2JPNTOH'7', 3CPRIMP'8'); /* '1' Department of Physics */ /* '2' Center for Nuclear Study (CNS) */ /* '4' Department of Physics */ /* '7' Department of Physics */ REF=PL/B; VLP=515(2001)255; RCTS=(P(14BE,14B)N, D(14BE,14B)X); PHQS=(ENGY-SPEC, ANGL-DSTRN, X'9', X'10', COULOMB-DISP-ENGY'11'); /* '9' Energy and width of the peak of the decay energy spectra of the 12Be + p + n channel for the (p,n) reaction */ /* '10' Excitation energy of the IAS */ /* '11' Coulomb displacement energy for the pair of 14Be and its IAS. */ /*===================================================================*/ /* Experimental Conditions */ /*===================================================================*/ \\EXP,6; /* 2003-07-09 : Compiled */ ENR=X%; PHYS-FORM=SLD; BAC=X; POL-TGT=0%; ALGN-TGT=0%; ACC=(CYC'12',PRJFS'13'); /* '12' Primary beam of 100 AMeV 18O on a 1110 mg/cm**2 thic 9Be target */ /* '13' Secondary beam of 14Be selected by the RIKEN Projectile Fragment Separator (RIPS) [T.Kubo et al., Nucl. Instrum. Methods B70(1992)309]. */ INST-ACC=(2JPNIPC'12',2JPNIPC'13'); INC-ENGY-LAB=74MEV/A; ERS-PRJ=8MEV/A; BEAM-INTNSTY=1e4PPS'14'; /* '14' Typical intensity of the 14Be beam with a purity of around 80% */ POL-PRJ=0%; DET-PARTCL=(P,N,12BE); COINC=(P,N,12BE); ANT-COINC=NO; DET-SYS=(PLST-SCT'15',TOF'16'); /* '15' To detect decay particles from 14B*. Resolutions of TOF were about 1.2% (FWHM) for charged particles and about 1.5%(FWHM) for neutrons at the energies of 74 AMeV. */ /* '16' To determine velocities of the decay particles */ ERS-DET=0.15MEV'17'; /* '17' Resolution of decay energy at 0.3 MeV */ /* Experimental Method: - Time-of-flight (To determine velocities of the decay particles) /* Analysis: - Invariant mass method RCT=P(14BE,14B)N; PHQ=COULOMB-DISP-ENGY'51'; /* '51' Coulomb displacement energy for the pair of 14Be and its IAS. */ CHM=CH2'52'; /* '52' (CH2)n and C target are used, C target was used to subtract the contributions of carbon nuclei in the (CH2)n target. */ THK-TGT=XMG/CM**2'53'; /* '53' 187 and 152 mg/cm2 for (CH2)n and C target, respectively. ANL=X'54'; /* '54' Coulomb displacement energy is estimated by a liquid-drop model. */ /* Analysis: - In order to deduce the resonance energy of the IAS, the peak of decay energy spectra was fitted with a Gaussian functio and a background with a shape of a three-body phase space (see Fig.2(c) of reference). The E(d) resolution detector acceptance and angular distribution of 14B* were taken into account in the fitting procedure. /*===================================================================*/ /* Descriptive Parameters */ /*===================================================================*/ \\DATA,6; INC-ENGY-LAB=74MEV/A; EMT-1=12BE; RSD=N; /*===================================================================*/ /* Data Table */ /*===================================================================*/ \DATA; COULOMB-DISP-ENGY'55' DELTA-ENGY (MEV) (MEV) 1.62 +-0.11 \END; /*===================================================================*/ |