Ionization and dissociation fractions of CO2under 10–30-keV H−, C−, and O

Junqin Li

¹

,

Zilong Zhao

²

,

Jingru Ye

³

et al.

Abstract

The ionization and dissociation fractions of CO2 molecule are studied under impact of 10-30 keV negative ions H − , C − and O − . The four recoil ions originating from the target molecule CO2 (CO + 2 , CO + , O + , and C + ) are measured and identified in coincidence with projectiles in two final charge states(q = 0 and q = +1) by using time-of flight spectrometer. The ionization and dissociation fractions of CO2 are found to associate with the momentum of the impacting ions. We also analyze the fractions for ionization and dissociation from a physical point. No comparison is given since no other experimental and theoretical data exist in the investigated energy range.

Reinvestigation of high spin states and proposed octupole correlations inCe147

“…One can see that the I x values are very close to each other in those N = 89 isotones. On the other hand, the I x value in the negative-parity bands is larger than those in the positive parity bands in each isotone, which is also observed in s = +1 octupole bands in even-even Ce isotopes [14]. On the other hand, one can also see that in the positive-parity band (1) the backbendings occur at ω ∼ 0.29 MeV for 147 Ce and ω ∼ 0.33 MeV for 149 Nd.…”

“…Theoretical calculations predicted the existence of octupole deformation around the Z = 56 and N = 88 neutron-rich nuclear region [1][2][3]. By using large detector arrays, octupole-deformed bands and octupole correlations have been identified in many nuclei in this region, especially in even-even Ba (Z = 56) and Ce (Z = 58) nuclei, such as, in 140,142,144,146,148 Ba [3][4][5][6][7][8], 144,146,148,150,152 Ce [4,[9][10][11][12][13][14]. For the odd-A nuclei in this region, octupole deformation and octupole correlations have also been identified in several nuclei, e.g.…”

“…Detailed information of the experiment can be found in Refs. [13,14,23]. The coincidence data were analyzed with the Radware software package using the triple-and four-fold γ coincidence methods [24].…”

Fragmentation ofCO22+in collisions with low-energy electrons

“…Various projectiles have been applied to generate numerous molecular ions, including synchrotron radiation [6][7][8][9][10], positively and negatively charged ions [2,5,[11][12][13][14][15][16], electrons [4,[17][18][19][20][21], and intense lasers [3,[22][23][24][25][26][27][28][29][30].…”

Proposeds=±1octupole bands inXe140

“…With the development of large detector arrays utilized in prompt γ spectroscopy following fission of heavy nuclei [13], more abundant examples of octupole deformation/correlations are identified in 140−146,148 Ba (Z = 56) [13][14][15][16][17], 145,147 La (Z = 57) [18] and 144,[146][147][148]150,152 Ce (Z =58) [13,[19][20][21][22][23][24][25][26]. Among these nuclei, most of the octupole bands were observed with a single simplex quantum number, namely s = +1 band structure in even-even nuclei and s = + i or s = -i band structure in odd-A nuclei.…”