Nuclear data sheets update for a = 98

Singh, Balraj

doi:10.1016/0090-3752(92)80028-i

Cited by 16 publications

(2 citation statements)

References 244 publications

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“…This is in contrast to a 10%%uo feeding reported earlier [1]. The absence of any substantial direct P feeding to either the 1398.1 keV 4+ excited state or to the 0+ ground state of Ru strongly supports the assignment of J = 2+ and rules out the assignment of 1+ (also supported &om the P decay of ssPd [15]) or 3+ for the ground state of Rh. A modified partial decay scheme for the decay of ssRhg based on our observations is shown in Fig.…”

supporting

confidence: 49%

Decay ofRh98

Banerjee

Murthy

et al. 1994

Phys. Rev. C

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The decay of Rh has been studied using p and P spectroscopy techniques. The Ru(n, pn) reaction was used to produce Rh and the activities were transported to a low background counting station using a He-jet system. The P end point energy has been determined from the decay of Rht o Ru. The end-point energy determined in this study differs considerably from an earlier study using similar technique but agrees well with that of an earlier (p, n) reaction study. The present study has also resulted in a modified decay scheme (partial) for the decay of Rh. ]. The authors reported P feedings to a number of states in ssRu from the ground state of ssRh; the P transitions to the 0+) 2+) and 4+ states of the ground state band in Ru were observed with intensities of 10%, 70%, and 5%, respectively. This, in turn, did not allow an unambiguous spin-parity assignment for the ground state of Rh [1,2]. The P end-point energy was also determined in the above study, which, however, differs considerably, as much as 600 keV, from the value of 5057(10) keV obtained earlier from a 9sRu(p, n) reaction study [3]. The atomic mass table of Wapstra and Audi [4] has reported the latter value, which also agrees with the predictions of other mass tables [5].It was hoped, therefore, that a careful study of the decay of Rh~should help remove the above discrepancy in the end-point energy and may also lead to an improved decay scheme for 9 Rh decay. In this Brief Report the experimental determination of the P end-point energy using singles and coincidence P-p spectroscopy is reported. The modifications in the decay scheme that have resulted f'rom the present study are discussed.The nucleus ssRh was produced in the 9 Ru(n, pn) reaction with an a beam &om the Cyclotron at the Variable Energy Cyclotron Centre, Calcutta. The target was natural ruthenium of thickness 10 mg/cm2 deposited on a 25 pm Al foil. The incident beam energy was chosen to be 30.25 MeV, which was decided on the basis of the relative p-ray excitation function measurements of 98Rh with respect to other products, in the incident beam energy range from 25 to 42 MeV (on target). The recoil products were transported to a low background counting station, 10 m away &om the target chamber, using a Hejet recoil transport system [6] and collected on a 10 pm thick Mylar foil.The telescope for P-particle detection consisted of two NE102 plastic scintillator detectors; the AE detector (for p-rejection) was 500 pm thick and 25 mm in diameter, and the E detector was 15 cm thick and 15 cm in diameter. The AE detector was placed very close to the collection foil, and the E detector was suitably placed so that only the P particles which pass through the b, E de-6 10 5 10 4 (n 1oz: c3 10 2 10 1 10 I I I I I I 1150 1350 1550 1750 1950 CHANNEL NUMBER FIG. 1. Relevant portion of a typical singles p-ray spectrum.tector are collected in the E detector. The p-ray detector was a 10% HPGe with an energy resolution of 2.0 keV at 1332 keV. The p-ray detector was placed in a close geometry with respect to the acti...

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supporting

confidence: 49%

Decay ofRh98

Banerjee

Murthy

et al. 1994

Phys. Rev. C

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“…Since by now some environmental parameters are clearly affected by man (e.g. the concentration of important trace gases Be, 10 Be, 14 C, 26 Al, 32 Si, 36 Cl, 39 Cl, 41 Ca, 44 Ti, 59 Ni, 60 in the atmosphere such as O 3 , CO 2 , and CH 4 ), we are most concerned that we disturb the environment in a way Nature will not be able to cope with. The basis for a better assessment of the overall environmental situation is a clear understanding of the natural variations in the past.…”

Section: -The Seven Spheres Of Our Environmentmentioning

confidence: 99%